Adding upstream version 1:7.0.4.upstream/1%7.0.4upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

91 files changed, 23686 insertions, 0 deletions

diff --git a/xmlsecurity/source/component/certificatecontainer.cxx b/xmlsecurity/source/component/certificatecontainer.cxx
new file mode 100644
index 000000000..7e9db3558
--- /dev/null
+++ b/xmlsecurity/source/component/certificatecontainer.cxx
@@ -0,0 +1,171 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <map>
+
+#include <cppuhelper/implbase.hxx>
+#include <com/sun/star/security/XCertificateContainer.hpp>
+#include <com/sun/star/lang/XServiceInfo.hpp>
+
+#include <cppuhelper/supportsservice.hxx>
+#include <rtl/ref.hxx>
+
+#include <sal/config.h>
+
+namespace com::sun::star::uno { class XComponentContext; }
+
+using namespace ::com::sun::star;
+using namespace ::com::sun::star::lang;
+using namespace ::com::sun::star::uno;
+
+namespace {
+
+class CertificateContainer
+    : public ::cppu::WeakImplHelper<css::lang::XServiceInfo, css::security::XCertificateContainer>
+{
+private:
+    typedef std::map<OUString, OUString> Map;
+    Map certMap;
+    Map certTrustMap;
+
+    static bool searchMap(const OUString& url, const OUString& certificate_name, Map& _certMap);
+    /// @throws css::uno::RuntimeException
+    bool isTemporaryCertificate(const OUString& url, const OUString& certificate_name);
+    /// @throws css::uno::RuntimeException
+    bool isCertificateTrust(const OUString& url, const OUString& certificate_name);
+
+public:
+    explicit CertificateContainer(const uno::Reference<uno::XComponentContext>&) {}
+    virtual sal_Bool SAL_CALL addCertificate(const OUString& url, const OUString& certificate_name,
+                                             sal_Bool trust) override;
+    virtual css::security::CertificateContainerStatus SAL_CALL
+    hasCertificate(const OUString& url, const OUString& certificate_name) override;
+
+    // XServiceInfo
+    virtual OUString SAL_CALL getImplementationName() override;
+    virtual sal_Bool SAL_CALL supportsService(const OUString& ServiceName) override;
+
+    virtual css::uno::Sequence<OUString> SAL_CALL getSupportedServiceNames() override;
+};
+
+}
+
+bool
+CertificateContainer::searchMap( const OUString & url, const OUString & certificate_name, Map &_certMap )
+{
+    Map::iterator p = _certMap.find(url);
+
+    bool ret = false;
+
+    while( p != _certMap.end() )
+    {
+        ret = (*p).second == certificate_name;
+        if( ret )
+                    break;
+        ++p;
+    }
+
+    return ret;
+}
+
+bool
+CertificateContainer::isTemporaryCertificate ( const OUString & url, const OUString & certificate_name )
+{
+    return searchMap( url, certificate_name, certMap);
+}
+
+bool
+CertificateContainer::isCertificateTrust ( const OUString & url, const OUString & certificate_name )
+{
+    return searchMap( url, certificate_name, certTrustMap);
+}
+
+sal_Bool
+CertificateContainer::addCertificate( const OUString & url, const OUString & certificate_name, sal_Bool trust )
+{
+    certMap.emplace( url, certificate_name );
+
+    //remember that the cert is trusted
+    if (trust)
+        certTrustMap.emplace( url, certificate_name );
+
+    return true;
+}
+
+::security::CertificateContainerStatus
+CertificateContainer::hasCertificate( const OUString & url, const OUString & certificate_name )
+{
+    if ( isTemporaryCertificate( url, certificate_name ) )
+    {
+        if ( isCertificateTrust( url, certificate_name ) )
+            return security::CertificateContainerStatus_TRUSTED;
+        else
+            return security::CertificateContainerStatus_UNTRUSTED;
+    } else
+    {
+        return security::CertificateContainerStatus_NOCERT;
+    }
+}
+
+OUString SAL_CALL
+CertificateContainer::getImplementationName( )
+{
+    return "com.sun.star.security.CertificateContainer";
+}
+
+sal_Bool SAL_CALL
+CertificateContainer::supportsService( const OUString& ServiceName )
+{
+    return cppu::supportsService( this, ServiceName );
+}
+
+Sequence< OUString > SAL_CALL
+CertificateContainer::getSupportedServiceNames(  )
+{
+    Sequence< OUString > aRet { "com.sun.star.security.CertificateContainer" };
+    return aRet;
+}
+
+namespace
+{
+struct Instance
+{
+    explicit Instance(css::uno::Reference<css::uno::XComponentContext> const& context)
+        : instance(new CertificateContainer(context))
+    {
+    }
+
+    rtl::Reference<CertificateContainer> instance;
+};
+
+struct Singleton
+    : public rtl::StaticWithArg<Instance, css::uno::Reference<css::uno::XComponentContext>,
+                                Singleton>
+{
+};
+}
+
+extern "C" SAL_DLLPUBLIC_EXPORT css::uno::XInterface*
+com_sun_star_security_CertificateContainer_get_implementation(
+    css::uno::XComponentContext* context, css::uno::Sequence<css::uno::Any> const&)
+{
+    return cppu::acquire(Singleton::get(context).instance.get());
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/component/documentdigitalsignatures.cxx b/xmlsecurity/source/component/documentdigitalsignatures.cxx
new file mode 100644
index 000000000..d149bf5e3
--- /dev/null
+++ b/xmlsecurity/source/component/documentdigitalsignatures.cxx
@@ -0,0 +1,853 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <resourcemanager.hxx>
+
+#include <digitalsignaturesdialog.hxx>
+#include <certificatechooser.hxx>
+#include <certificateviewer.hxx>
+#include <macrosecurity.hxx>
+#include <biginteger.hxx>
+#include <strings.hrc>
+#include <pdfsignaturehelper.hxx>
+#include <sax/tools/converter.hxx>
+
+#include <com/sun/star/embed/XStorage.hpp>
+#include <com/sun/star/embed/StorageFormats.hpp>
+#include <com/sun/star/embed/XTransactedObject.hpp>
+#include <com/sun/star/embed/ElementModes.hpp>
+#include <com/sun/star/lang/XInitialization.hpp>
+#include <com/sun/star/lang/XServiceInfo.hpp>
+#include <com/sun/star/ucb/XContent.hpp>
+#include <com/sun/star/ucb/XContentIdentifierFactory.hpp>
+#include <com/sun/star/ucb/XCommandEnvironment.hpp>
+#include <com/sun/star/ucb/XCommandProcessor.hpp>
+#include <com/sun/star/ucb/Command.hpp>
+#include <com/sun/star/uno/SecurityException.hpp>
+#include <vcl/weld.hxx>
+#include <vcl/svapp.hxx>
+#include <tools/date.hxx>
+#include <unotools/securityoptions.hxx>
+#include <com/sun/star/security/CertificateValidity.hpp>
+#include <com/sun/star/security/CertificateKind.hpp>
+#include <comphelper/base64.hxx>
+#include <comphelper/documentconstants.hxx>
+#include <comphelper/propertyvalue.hxx>
+#include <comphelper/sequence.hxx>
+#include <cppuhelper/implbase.hxx>
+#include <comphelper/xmlsechelper.hxx>
+#include <cppuhelper/supportsservice.hxx>
+#include <sal/log.hxx>
+#include <com/sun/star/lang/IllegalArgumentException.hpp>
+#include <com/sun/star/security/XDocumentDigitalSignatures.hpp>
+#include <com/sun/star/xml/crypto/XXMLSecurityContext.hpp>
+
+#include <map>
+
+using namespace css;
+using namespace css::uno;
+using namespace css::lang;
+using namespace css::security;
+using namespace css::xml::crypto;
+
+namespace {
+
+class DocumentDigitalSignatures
+    : public cppu::WeakImplHelper<css::security::XDocumentDigitalSignatures,
+                                  css::lang::XInitialization, css::lang::XServiceInfo>
+{
+private:
+    css::uno::Reference<css::uno::XComponentContext> mxCtx;
+    css::uno::Reference<css::awt::XWindow> mxParentWindow;
+
+    /// will be set by XInitialization. If not we assume true. false means an earlier version (whatever that means,
+    /// this is a string, not a boolean).
+    /// Note that the code talks about "ODF version" even if this class is also used to sign OOXML.
+    OUString m_sODFVersion;
+    /// The number of arguments which were passed in XInitialization::initialize
+    int m_nArgumentsCount;
+    /// Indicates if the document already contains a document signature
+    bool m_bHasDocumentSignature;
+
+    /// @throws css::uno::RuntimeException
+    bool ImplViewSignatures(const css::uno::Reference<css::embed::XStorage>& rxStorage,
+                            const css::uno::Reference<css::io::XStream>& xSignStream,
+                            DocumentSignatureMode eMode, bool bReadOnly);
+    /// @throws css::uno::RuntimeException
+    void ImplViewSignatures(const css::uno::Reference<css::embed::XStorage>& rxStorage,
+                            const css::uno::Reference<css::io::XInputStream>& xSignStream,
+                            DocumentSignatureMode eMode, bool bReadOnly);
+    /// @throws css::uno::RuntimeException
+    css::uno::Sequence<css::security::DocumentSignatureInformation>
+    ImplVerifySignatures(const css::uno::Reference<css::embed::XStorage>& rxStorage,
+                         const ::com::sun::star::uno::Reference<css::io::XInputStream>& xSignStream,
+                         DocumentSignatureMode eMode);
+
+    css::uno::Sequence<css::uno::Reference<css::security::XCertificate>>
+    chooseCertificatesImpl(std::map<OUString, OUString>& rProperties, const UserAction eAction,
+                           const CertificateKind certificateKind=CertificateKind_NONE);
+
+    bool signWithCertificateImpl(
+        css::uno::Reference<css::security::XCertificate> const& xCertificate,
+        css::uno::Reference<css::embed::XStorage> const& xStorage,
+        css::uno::Reference<css::io::XStream> const& xStream, DocumentSignatureMode eMode);
+
+ public:
+    explicit DocumentDigitalSignatures(
+        const css::uno::Reference<css::uno::XComponentContext>& rxCtx);
+
+    //XInitialization
+    void SAL_CALL initialize(const css::uno::Sequence<css::uno::Any>& aArguments) override;
+
+    OUString SAL_CALL getImplementationName() override;
+
+    sal_Bool SAL_CALL supportsService(OUString const& ServiceName) override;
+
+    css::uno::Sequence<OUString> SAL_CALL getSupportedServiceNames() override;
+
+    // XDocumentDigitalSignatures
+    sal_Bool SAL_CALL
+    signDocumentContent(const css::uno::Reference<css::embed::XStorage>& xStorage,
+                        const css::uno::Reference<css::io::XStream>& xSignStream) override;
+    sal_Bool SAL_CALL signSignatureLine(
+        const css::uno::Reference<css::embed::XStorage>& Storage,
+        const css::uno::Reference<css::io::XStream>& xSignStream, const OUString& aSignatureLineId,
+        const Reference<css::security::XCertificate>& xCertificate,
+        const Reference<css::graphic::XGraphic>& xValidGraphic,
+        const Reference<css::graphic::XGraphic>& xInvalidGraphic,
+        const OUString& aComment) override;
+    css::uno::Sequence<css::security::DocumentSignatureInformation>
+        SAL_CALL verifyDocumentContentSignatures(
+            const css::uno::Reference<css::embed::XStorage>& xStorage,
+            const css::uno::Reference<css::io::XInputStream>& xSignInStream) override;
+    void SAL_CALL showDocumentContentSignatures(
+        const css::uno::Reference<css::embed::XStorage>& xStorage,
+        const css::uno::Reference<css::io::XInputStream>& xSignInStream) override;
+    OUString SAL_CALL getDocumentContentSignatureDefaultStreamName() override;
+    sal_Bool SAL_CALL
+    signScriptingContent(const css::uno::Reference<css::embed::XStorage>& xStorage,
+                         const css::uno::Reference<css::io::XStream>& xSignStream) override;
+    css::uno::Sequence<css::security::DocumentSignatureInformation>
+        SAL_CALL verifyScriptingContentSignatures(
+            const css::uno::Reference<css::embed::XStorage>& xStorage,
+            const css::uno::Reference<css::io::XInputStream>& xSignInStream) override;
+    void SAL_CALL showScriptingContentSignatures(
+        const css::uno::Reference<css::embed::XStorage>& xStorage,
+        const css::uno::Reference<css::io::XInputStream>& xSignInStream) override;
+    OUString SAL_CALL getScriptingContentSignatureDefaultStreamName() override;
+    sal_Bool SAL_CALL
+    signPackage(const css::uno::Reference<css::embed::XStorage>& Storage,
+                const css::uno::Reference<css::io::XStream>& xSignStream) override;
+    css::uno::Sequence<css::security::DocumentSignatureInformation>
+        SAL_CALL verifyPackageSignatures(
+            const css::uno::Reference<css::embed::XStorage>& Storage,
+            const css::uno::Reference<css::io::XInputStream>& xSignInStream) override;
+    void SAL_CALL
+    showPackageSignatures(const css::uno::Reference<css::embed::XStorage>& xStorage,
+                          const css::uno::Reference<css::io::XInputStream>& xSignInStream) override;
+    OUString SAL_CALL getPackageSignatureDefaultStreamName() override;
+    void SAL_CALL
+    showCertificate(const css::uno::Reference<css::security::XCertificate>& Certificate) override;
+    void SAL_CALL manageTrustedSources() override;
+    sal_Bool SAL_CALL
+    isAuthorTrusted(const css::uno::Reference<css::security::XCertificate>& Author) override;
+    sal_Bool SAL_CALL isLocationTrusted(const OUString& Location) override;
+    void SAL_CALL addAuthorToTrustedSources(
+        const css::uno::Reference<css::security::XCertificate>& Author) override;
+    void SAL_CALL addLocationToTrustedSources(const OUString& Location) override;
+
+    css::uno::Reference<css::security::XCertificate>
+        SAL_CALL chooseCertificate(OUString& rDescription) override;
+    css::uno::Reference<css::security::XCertificate>
+        SAL_CALL chooseSigningCertificate(OUString& rDescription) override;
+    css::uno::Reference<css::security::XCertificate>
+        SAL_CALL selectSigningCertificate(OUString& rDescription) override;
+    css::uno::Reference<css::security::XCertificate>
+        SAL_CALL selectSigningCertificateWithType(const CertificateKind certificateKind,
+                                                  OUString& rDescription) override;
+    css::uno::Sequence<css::uno::Reference<css::security::XCertificate>>
+        SAL_CALL chooseEncryptionCertificate() override;
+    css::uno::Reference<css::security::XCertificate> SAL_CALL chooseCertificateWithProps(
+        css::uno::Sequence<::com::sun::star::beans::PropertyValue>& Properties) override;
+
+    sal_Bool SAL_CALL signDocumentWithCertificate(
+                            css::uno::Reference<css::security::XCertificate> const & xCertificate,
+                            css::uno::Reference<css::embed::XStorage> const & xStoragexStorage,
+                            css::uno::Reference<css::io::XStream> const & xStream) override;
+
+    sal_Bool SAL_CALL signPackageWithCertificate(
+                            css::uno::Reference<css::security::XCertificate> const& xCertificate,
+                            css::uno::Reference<css::embed::XStorage> const& xStoragexStorage,
+                            css::uno::Reference<css::io::XStream> const& xStream) override;
+
+    sal_Bool SAL_CALL signScriptingContentWithCertificate(
+                            css::uno::Reference<css::security::XCertificate> const& xCertificate,
+                            css::uno::Reference<css::embed::XStorage> const& xStoragexStorage,
+                            css::uno::Reference<css::io::XStream> const& xStream) override;
+
+    void SAL_CALL setParentWindow(const css::uno::Reference<css::awt::XWindow>& rParentwindow) override
+    {
+        mxParentWindow = rParentwindow;
+    }
+};
+
+}
+
+DocumentDigitalSignatures::DocumentDigitalSignatures( const Reference< XComponentContext >& rxCtx ):
+    mxCtx(rxCtx),
+    m_sODFVersion(ODFVER_013_TEXT),
+    m_nArgumentsCount(0),
+    m_bHasDocumentSignature(false)
+{
+}
+
+void DocumentDigitalSignatures::initialize( const Sequence< Any >& aArguments)
+{
+    if (aArguments.getLength() > 2)
+        throw css::lang::IllegalArgumentException(
+          "DocumentDigitalSignatures::initialize requires zero, one, or two arguments",
+          static_cast<XInitialization*>(this), 0);
+
+    m_nArgumentsCount = aArguments.getLength();
+
+    if (aArguments.hasElements())
+    {
+        if (!(aArguments[0] >>= m_sODFVersion))
+            throw css::lang::IllegalArgumentException(
+                "DocumentDigitalSignatures::initialize: the first arguments must be a string",
+                static_cast<XInitialization*>(this), 0);
+
+        if (aArguments.getLength() == 2
+            && !(aArguments[1] >>= m_bHasDocumentSignature))
+            throw css::lang::IllegalArgumentException(
+                "DocumentDigitalSignatures::initialize: the second arguments must be a bool",
+                static_cast<XInitialization*>(this), 1);
+
+        //the Version is supported as of ODF1.2, so for and 1.1 document or older we will receive the
+        //an empty string. In this case we set it to ODFVER_010_TEXT. Then we can later check easily
+        //if initialize was called. Only then m_sODFVersion.getLength() is greater than 0
+        if (m_sODFVersion.isEmpty())
+            m_sODFVersion = ODFVER_010_TEXT;
+    }
+}
+
+OUString DocumentDigitalSignatures::getImplementationName()
+{
+    return "com.sun.star.security.DocumentDigitalSignatures";
+}
+
+sal_Bool DocumentDigitalSignatures::supportsService(
+    OUString const & ServiceName)
+{
+    return cppu::supportsService(this, ServiceName);
+}
+
+css::uno::Sequence<OUString>
+DocumentDigitalSignatures::getSupportedServiceNames()
+{
+    Sequence<OUString> aRet{ "com.sun.star.security.DocumentDigitalSignatures" };
+    return aRet;
+}
+
+sal_Bool DocumentDigitalSignatures::signDocumentContent(
+    const Reference< css::embed::XStorage >& rxStorage,
+    const Reference< css::io::XStream >& xSignStream)
+{
+    OSL_ENSURE(!m_sODFVersion.isEmpty(), "DocumentDigitalSignatures: ODF Version not set, assuming minimum 1.2");
+    return ImplViewSignatures( rxStorage, xSignStream, DocumentSignatureMode::Content, false );
+}
+
+sal_Bool DocumentDigitalSignatures::signSignatureLine(
+    const Reference<css::embed::XStorage>& rxStorage,
+    const Reference<css::io::XStream>& xSignStream,
+    const OUString& aSignatureLineId,
+    const Reference<css::security::XCertificate>& xCertificate,
+    const Reference<css::graphic::XGraphic>& xValidGraphic,
+    const Reference<css::graphic::XGraphic>& xInvalidGraphic,
+    const OUString& aComment)
+{
+    OSL_ENSURE(!m_sODFVersion.isEmpty(),
+               "DocumentDigitalSignatures: ODF Version not set, assuming minimum 1.2");
+
+    DocumentSignatureManager aSignatureManager(mxCtx, DocumentSignatureMode::Content);
+
+    if (!aSignatureManager.init())
+        return false;
+
+    aSignatureManager.setStore(rxStorage);
+    aSignatureManager.getSignatureHelper().SetStorage(rxStorage, m_sODFVersion);
+    aSignatureManager.setSignatureStream(xSignStream);
+
+    Reference<XXMLSecurityContext> xSecurityContext;
+    Reference<XServiceInfo> xServiceInfo(xCertificate, UNO_QUERY);
+    if (xServiceInfo->getImplementationName()
+        == "com.sun.star.xml.security.gpg.XCertificate_GpgImpl")
+        xSecurityContext = aSignatureManager.getGpgSecurityContext();
+    else
+        xSecurityContext = aSignatureManager.getSecurityContext();
+
+    sal_Int32 nSecurityId;
+    bool bSuccess = aSignatureManager.add(xCertificate, xSecurityContext, aComment, nSecurityId,
+                                          true, aSignatureLineId, xValidGraphic, xInvalidGraphic);
+    if (!bSuccess)
+        return false;
+
+    // Need to have this to verify the signature
+    aSignatureManager.read(/*bUseTempStream=*/true, /*bCacheLastSignature=*/false);
+    aSignatureManager.write(true);
+
+    if (rxStorage.is() && !xSignStream.is())
+    {
+        uno::Reference<embed::XTransactedObject> xTrans(rxStorage, uno::UNO_QUERY);
+        xTrans->commit();
+    }
+
+    return true;
+}
+
+Sequence< css::security::DocumentSignatureInformation >
+DocumentDigitalSignatures::verifyDocumentContentSignatures(
+    const Reference< css::embed::XStorage >& rxStorage,
+    const Reference< css::io::XInputStream >& xSignInStream )
+{
+    OSL_ENSURE(!m_sODFVersion.isEmpty(),"DocumentDigitalSignatures: ODF Version not set, assuming minimum 1.2");
+    return ImplVerifySignatures( rxStorage, xSignInStream, DocumentSignatureMode::Content );
+}
+
+void DocumentDigitalSignatures::showDocumentContentSignatures(
+    const Reference< css::embed::XStorage >& rxStorage,
+    const Reference< css::io::XInputStream >& xSignInStream )
+{
+    OSL_ENSURE(!m_sODFVersion.isEmpty(),"DocumentDigitalSignatures: ODF Version not set, assuming minimum 1.2");
+    ImplViewSignatures( rxStorage, xSignInStream, DocumentSignatureMode::Content, true );
+}
+
+OUString DocumentDigitalSignatures::getDocumentContentSignatureDefaultStreamName()
+{
+    return DocumentSignatureHelper::GetDocumentContentSignatureDefaultStreamName();
+}
+
+sal_Bool DocumentDigitalSignatures::signScriptingContent(
+    const Reference< css::embed::XStorage >& rxStorage,
+    const Reference< css::io::XStream >& xSignStream )
+{
+    OSL_ENSURE(!m_sODFVersion.isEmpty(),"DocumentDigitalSignatures: ODF Version not set, assuming minimum 1.2");
+    OSL_ENSURE(m_nArgumentsCount == 2, "DocumentDigitalSignatures: Service was not initialized properly");
+    return ImplViewSignatures( rxStorage, xSignStream, DocumentSignatureMode::Macros, false );
+}
+
+Sequence< css::security::DocumentSignatureInformation >
+DocumentDigitalSignatures::verifyScriptingContentSignatures(
+    const Reference< css::embed::XStorage >& rxStorage,
+    const Reference< css::io::XInputStream >& xSignInStream )
+{
+    OSL_ENSURE(!m_sODFVersion.isEmpty(),"DocumentDigitalSignatures: ODF Version not set, assuming minimum 1.2");
+    return ImplVerifySignatures( rxStorage, xSignInStream, DocumentSignatureMode::Macros );
+}
+
+void DocumentDigitalSignatures::showScriptingContentSignatures(
+    const Reference< css::embed::XStorage >& rxStorage,
+    const Reference< css::io::XInputStream >& xSignInStream )
+{
+    OSL_ENSURE(!m_sODFVersion.isEmpty(),"DocumentDigitalSignatures: ODF Version not set, assuming minimum 1.2");
+    ImplViewSignatures( rxStorage, xSignInStream, DocumentSignatureMode::Macros, true );
+}
+
+OUString DocumentDigitalSignatures::getScriptingContentSignatureDefaultStreamName()
+{
+    return DocumentSignatureHelper::GetScriptingContentSignatureDefaultStreamName();
+}
+
+
+sal_Bool DocumentDigitalSignatures::signPackage(
+    const Reference< css::embed::XStorage >& rxStorage,
+    const Reference< css::io::XStream >& xSignStream  )
+{
+    OSL_ENSURE(!m_sODFVersion.isEmpty(),"DocumentDigitalSignatures: ODF Version not set, assuming minimum 1.2");
+    return ImplViewSignatures( rxStorage, xSignStream, DocumentSignatureMode::Package, false );
+}
+
+Sequence< css::security::DocumentSignatureInformation >
+DocumentDigitalSignatures::verifyPackageSignatures(
+    const Reference< css::embed::XStorage >& rxStorage,
+    const Reference< css::io::XInputStream >& xSignInStream )
+{
+    OSL_ENSURE(!m_sODFVersion.isEmpty(),"DocumentDigitalSignatures: ODF Version not set, assuming minimum 1.2");
+    return ImplVerifySignatures( rxStorage, xSignInStream, DocumentSignatureMode::Package );
+}
+
+void DocumentDigitalSignatures::showPackageSignatures(
+    const Reference< css::embed::XStorage >& rxStorage,
+    const Reference< css::io::XInputStream >& xSignInStream )
+{
+    OSL_ENSURE(!m_sODFVersion.isEmpty(),"DocumentDigitalSignatures: ODF Version not set, assuming minimum 1.2");
+    ImplViewSignatures( rxStorage, xSignInStream, DocumentSignatureMode::Package, true );
+}
+
+OUString DocumentDigitalSignatures::getPackageSignatureDefaultStreamName(  )
+{
+    return DocumentSignatureHelper::GetPackageSignatureDefaultStreamName();
+}
+
+
+void DocumentDigitalSignatures::ImplViewSignatures(
+    const Reference< css::embed::XStorage >& rxStorage,
+    const Reference< css::io::XInputStream >& xSignStream,
+    DocumentSignatureMode eMode, bool bReadOnly )
+{
+    Reference< io::XStream > xStream;
+    if ( xSignStream.is() )
+        xStream.set( xSignStream, UNO_QUERY );
+    ImplViewSignatures( rxStorage, xStream, eMode, bReadOnly );
+}
+
+bool DocumentDigitalSignatures::ImplViewSignatures(
+    const Reference< css::embed::XStorage >& rxStorage, const Reference< css::io::XStream >& xSignStream,
+    DocumentSignatureMode eMode, bool bReadOnly )
+{
+    bool bChanges = false;
+    DigitalSignaturesDialog aSignaturesDialog(
+        Application::GetFrameWeld(mxParentWindow), mxCtx, eMode, bReadOnly, m_sODFVersion,
+        m_bHasDocumentSignature);
+    bool bInit = aSignaturesDialog.Init();
+    SAL_WARN_IF( !bInit, "xmlsecurity.comp", "Error initializing security context!" );
+    if ( bInit )
+    {
+        aSignaturesDialog.SetStorage(rxStorage);
+
+        aSignaturesDialog.SetSignatureStream( xSignStream );
+        if (aSignaturesDialog.run() == RET_OK)
+        {
+            if (aSignaturesDialog.SignaturesChanged())
+            {
+                bChanges = true;
+                // If we have a storage and no stream, we are responsible for commit
+                if ( rxStorage.is() && !xSignStream.is() )
+                {
+                    uno::Reference< embed::XTransactedObject > xTrans( rxStorage, uno::UNO_QUERY );
+                    xTrans->commit();
+                }
+            }
+        }
+    }
+    else
+    {
+        std::unique_ptr<weld::MessageDialog> xBox(Application::CreateMessageDialog(Application::GetFrameWeld(mxParentWindow),
+                                                  VclMessageType::Warning, VclButtonsType::Ok,
+                                                  XsResId(RID_XMLSECWB_NO_MOZILLA_PROFILE)));
+        xBox->run();
+    }
+
+    return bChanges;
+}
+
+Sequence< css::security::DocumentSignatureInformation >
+DocumentDigitalSignatures::ImplVerifySignatures(
+    const Reference< css::embed::XStorage >& rxStorage,
+    const Reference< css::io::XInputStream >& xSignStream, DocumentSignatureMode eMode )
+{
+    DocumentSignatureManager aSignatureManager(mxCtx, eMode);
+
+    bool bInit = aSignatureManager.init();
+
+    SAL_WARN_IF(!bInit, "xmlsecurity.comp", "Error initializing security context!");
+
+    if (!bInit)
+        return uno::Sequence<security::DocumentSignatureInformation>(0);
+
+    if (!rxStorage.is())
+    {
+        if (xSignStream.is())
+        {
+            // Something not ZIP-based, try PDF.
+            PDFSignatureHelper& rSignatureHelper = aSignatureManager.getPDFSignatureHelper();
+            if (rSignatureHelper.ReadAndVerifySignature(xSignStream))
+                return rSignatureHelper.GetDocumentSignatureInformations(aSignatureManager.getSecurityEnvironment());
+        }
+
+        SAL_WARN( "xmlsecurity.comp", "Error, no XStorage provided");
+        return Sequence<css::security::DocumentSignatureInformation>();
+    }
+    // First check for the InputStream, to avoid unnecessary initialization of the security environment...
+    SignatureStreamHelper aStreamHelper;
+    Reference< io::XInputStream > xInputStream = xSignStream;
+
+    if ( !xInputStream.is() )
+    {
+        aStreamHelper = DocumentSignatureHelper::OpenSignatureStream( rxStorage, embed::ElementModes::READ, eMode );
+        if ( aStreamHelper.xSignatureStream.is() )
+            xInputStream.set( aStreamHelper.xSignatureStream, UNO_QUERY );
+    }
+
+    if (!xInputStream.is() && aStreamHelper.nStorageFormat != embed::StorageFormats::OFOPXML)
+        return Sequence< css::security::DocumentSignatureInformation >(0);
+
+
+    XMLSignatureHelper& rSignatureHelper = aSignatureManager.getSignatureHelper();
+    rSignatureHelper.SetStorage(rxStorage, m_sODFVersion);
+
+    rSignatureHelper.StartMission(aSignatureManager.getSecurityContext());
+
+    if (xInputStream.is())
+        rSignatureHelper.ReadAndVerifySignature(xInputStream);
+    else if (aStreamHelper.nStorageFormat == embed::StorageFormats::OFOPXML)
+        rSignatureHelper.ReadAndVerifySignatureStorage(aStreamHelper.xSignatureStorage);
+
+    rSignatureHelper.EndMission();
+
+    uno::Reference<xml::crypto::XSecurityEnvironment> xSecEnv = aSignatureManager.getSecurityEnvironment();
+    uno::Reference<xml::crypto::XSecurityEnvironment> xGpgSecEnv = aSignatureManager.getGpgSecurityEnvironment();
+
+    SignatureInformations aSignInfos = rSignatureHelper.GetSignatureInformations();
+    int nInfos = aSignInfos.size();
+    Sequence< css::security::DocumentSignatureInformation > aInfos(nInfos);
+    css::security::DocumentSignatureInformation* arInfos = aInfos.getArray();
+
+    for (int n = 0; n < nInfos; ++n)
+    {
+        DocumentSignatureAlgorithm mode
+            = DocumentSignatureHelper::getDocumentAlgorithm(m_sODFVersion, aSignInfos[n]);
+        const std::vector<OUString> aElementsToBeVerified
+            = DocumentSignatureHelper::CreateElementList(rxStorage, eMode, mode);
+
+        const SignatureInformation& rInfo = aSignInfos[n];
+        css::security::DocumentSignatureInformation& rSigInfo = arInfos[n];
+
+        if (rInfo.ouGpgCertificate.isEmpty()) // X.509
+        {
+            if (!rInfo.ouX509Certificate.isEmpty())
+                rSigInfo.Signer = xSecEnv->createCertificateFromAscii(rInfo.ouX509Certificate);
+            if (!rSigInfo.Signer.is())
+                rSigInfo.Signer = xSecEnv->getCertificate(
+                    rInfo.ouX509IssuerName,
+                    xmlsecurity::numericStringToBigInteger(rInfo.ouX509SerialNumber));
+
+            // On Windows checking the certificate path is buggy. It does name matching (issuer, subject name)
+            // to find the parent certificate. It does not take into account that there can be several certificates
+            // with the same subject name.
+            try
+            {
+                rSigInfo.CertificateStatus = xSecEnv->verifyCertificate(
+                    rSigInfo.Signer, Sequence<Reference<css::security::XCertificate>>());
+            }
+            catch (SecurityException&)
+            {
+                OSL_FAIL("Verification of certificate failed");
+                rSigInfo.CertificateStatus = css::security::CertificateValidity::INVALID;
+            }
+        }
+        else if (xGpgSecEnv.is()) // GPG
+        {
+            // TODO not ideal to retrieve cert by keyID, might
+            // collide, or PGPKeyID format might change - can't we
+            // keep the xCert itself in rInfo?
+            rSigInfo.Signer = xGpgSecEnv->getCertificate(
+                rInfo.ouGpgKeyID, xmlsecurity::numericStringToBigInteger(""));
+            rSigInfo.CertificateStatus = xGpgSecEnv->verifyCertificate(
+                rSigInfo.Signer, Sequence<Reference<css::security::XCertificate>>());
+        }
+
+        // Time support again (#i38744#)
+        Date aDate(rInfo.stDateTime.Day, rInfo.stDateTime.Month, rInfo.stDateTime.Year);
+        tools::Time aTime(rInfo.stDateTime.Hours, rInfo.stDateTime.Minutes,
+                          rInfo.stDateTime.Seconds, rInfo.stDateTime.NanoSeconds);
+        rSigInfo.SignatureDate = aDate.GetDate();
+        rSigInfo.SignatureTime = aTime.GetTime() / tools::Time::nanoPerCenti;
+
+        rSigInfo.SignatureIsValid
+            = (rInfo.nStatus == css::xml::crypto::SecurityOperationStatus_OPERATION_SUCCEEDED);
+
+        // Signature line info (ID + Images)
+        if (!rInfo.ouSignatureLineId.isEmpty())
+            rSigInfo.SignatureLineId = rInfo.ouSignatureLineId;
+
+        if (rInfo.aValidSignatureImage.is())
+            rSigInfo.ValidSignatureLineImage = rInfo.aValidSignatureImage;
+
+        if (rInfo.aInvalidSignatureImage.is())
+            rSigInfo.InvalidSignatureLineImage = rInfo.aInvalidSignatureImage;
+
+        // OOXML intentionally doesn't sign metadata.
+        if (rSigInfo.SignatureIsValid
+            && aStreamHelper.nStorageFormat != embed::StorageFormats::OFOPXML)
+        {
+            rSigInfo.SignatureIsValid = DocumentSignatureHelper::checkIfAllFilesAreSigned(
+                aElementsToBeVerified, rInfo, mode);
+        }
+        if (eMode == DocumentSignatureMode::Content)
+        {
+            if (aStreamHelper.nStorageFormat == embed::StorageFormats::OFOPXML)
+                rSigInfo.PartialDocumentSignature = true;
+            else
+                rSigInfo.PartialDocumentSignature
+                    = !DocumentSignatureHelper::isOOo3_2_Signature(aSignInfos[n]);
+        }
+    }
+
+    return aInfos;
+
+}
+
+void DocumentDigitalSignatures::manageTrustedSources(  )
+{
+    // MT: i45295
+    // SecEnv is only needed to display certificate information from trusted sources.
+    // Macro Security also has some options where no security environment is needed, so raise dialog anyway.
+    // Later I should change the code so the Dialog creates the SecEnv on demand...
+
+    Reference< css::xml::crypto::XSecurityEnvironment > xSecEnv;
+
+    DocumentSignatureManager aSignatureManager(mxCtx, {});
+    if (aSignatureManager.init())
+        xSecEnv = aSignatureManager.getSecurityEnvironment();
+
+    MacroSecurity aDlg(Application::GetFrameWeld(mxParentWindow), xSecEnv);
+    aDlg.run();
+}
+
+void DocumentDigitalSignatures::showCertificate(
+    const Reference< css::security::XCertificate >& Certificate )
+{
+    DocumentSignatureManager aSignatureManager(mxCtx, {});
+
+    bool bInit = aSignatureManager.init();
+
+    SAL_WARN_IF( !bInit, "xmlsecurity.comp", "Error initializing security context!" );
+
+    if ( bInit )
+    {
+        CertificateViewer aViewer(Application::GetFrameWeld(mxParentWindow), aSignatureManager.getSecurityEnvironment(), Certificate, false, nullptr);
+        aViewer.run();
+    }
+}
+
+sal_Bool DocumentDigitalSignatures::isAuthorTrusted(
+    const Reference< css::security::XCertificate >& Author )
+{
+    OUString sSerialNum = xmlsecurity::bigIntegerToNumericString( Author->getSerialNumber() );
+
+    Sequence< SvtSecurityOptions::Certificate > aTrustedAuthors = SvtSecurityOptions().GetTrustedAuthors();
+
+    return std::any_of(aTrustedAuthors.begin(), aTrustedAuthors.end(),
+        [&Author, &sSerialNum](const SvtSecurityOptions::Certificate& rAuthor) {
+            return ( rAuthor[0] == Author->getIssuerName() )
+                && ( rAuthor[1] == sSerialNum );
+        });
+}
+
+uno::Sequence<Reference<css::security::XCertificate>>
+DocumentDigitalSignatures::chooseCertificatesImpl(std::map<OUString, OUString>& rProperties,
+                                                  const UserAction eAction,
+                                                  const CertificateKind certificateKind)
+{
+    std::vector< Reference< css::xml::crypto::XXMLSecurityContext > > xSecContexts;
+
+    DocumentSignatureManager aSignatureManager(mxCtx, {});
+    if (aSignatureManager.init()) {
+        xSecContexts.push_back(aSignatureManager.getSecurityContext());
+        // Don't include OpenPGP if only X.509 certs are requested
+        if (certificateKind == CertificateKind_NONE || certificateKind == CertificateKind_OPENPGP)
+            xSecContexts.push_back(aSignatureManager.getGpgSecurityContext());
+    }
+
+    CertificateChooser aChooser(Application::GetFrameWeld(mxParentWindow), xSecContexts, eAction);
+
+    uno::Sequence< Reference< css::security::XCertificate > > xCerts(1);
+    xCerts[0] = Reference< css::security::XCertificate >(nullptr);
+
+    if (aChooser.run() != RET_OK)
+        return xCerts;
+
+    xCerts = aChooser.GetSelectedCertificates();
+    rProperties["Description"] = aChooser.GetDescription();
+    rProperties["Usage"] = aChooser.GetUsageText();
+
+    return xCerts;
+}
+
+Reference< css::security::XCertificate > DocumentDigitalSignatures::chooseCertificate(OUString& rDescription)
+{
+    return chooseSigningCertificate( rDescription );
+}
+
+Reference< css::security::XCertificate > DocumentDigitalSignatures::chooseSigningCertificate(OUString& rDescription)
+{
+    std::map<OUString, OUString> aProperties;
+    Reference< css::security::XCertificate > xCert = chooseCertificatesImpl( aProperties, UserAction::Sign )[0];
+    rDescription = aProperties["Description"];
+    return xCert;
+}
+
+Reference< css::security::XCertificate > DocumentDigitalSignatures::selectSigningCertificate(OUString& rDescription)
+{
+    std::map<OUString, OUString> aProperties;
+    Reference< css::security::XCertificate > xCert = chooseCertificatesImpl( aProperties, UserAction::SelectSign )[0];
+    rDescription = aProperties["Description"];
+    return xCert;
+}
+
+Reference<css::security::XCertificate>
+DocumentDigitalSignatures::selectSigningCertificateWithType(const CertificateKind certificateKind,
+                                                            OUString& rDescription)
+{
+    std::map<OUString, OUString> aProperties;
+    Reference<css::security::XCertificate> xCert
+        = chooseCertificatesImpl(aProperties, UserAction::SelectSign, certificateKind)[0];
+    rDescription = aProperties["Description"];
+    return xCert;
+}
+
+css::uno::Sequence< Reference< css::security::XCertificate > > DocumentDigitalSignatures::chooseEncryptionCertificate()
+{
+    std::map<OUString, OUString> aProperties;
+    uno::Sequence< Reference< css::security::XCertificate > > aCerts=
+        chooseCertificatesImpl( aProperties, UserAction::Encrypt );
+    if (aCerts.getLength() == 1 && !aCerts[0].is())
+        // our error case contract is: empty sequence, so map that!
+        return uno::Sequence< Reference< css::security::XCertificate > >();
+    else
+        return aCerts;
+}
+
+css::uno::Reference< css::security::XCertificate > DocumentDigitalSignatures::chooseCertificateWithProps(Sequence<::com::sun::star::beans::PropertyValue>& rProperties)
+{
+    std::map<OUString, OUString> aProperties;
+    auto xCert = chooseCertificatesImpl( aProperties, UserAction::Sign )[0];
+
+    std::vector<css::beans::PropertyValue> vec;
+    vec.reserve(aProperties.size());
+    for (const auto& pair : aProperties)
+    {
+        vec.emplace_back(comphelper::makePropertyValue(pair.first, pair.second));
+    }
+
+    rProperties = comphelper::containerToSequence(vec);
+    return xCert;
+}
+
+sal_Bool DocumentDigitalSignatures::isLocationTrusted( const OUString& Location )
+{
+    return SvtSecurityOptions().isTrustedLocationUri(Location);
+}
+
+void DocumentDigitalSignatures::addAuthorToTrustedSources(
+    const Reference< css::security::XCertificate >& Author )
+{
+    SvtSecurityOptions aSecOpts;
+
+    SvtSecurityOptions::Certificate aNewCert( 3 );
+    aNewCert[ 0 ] = Author->getIssuerName();
+    aNewCert[ 1 ] = xmlsecurity::bigIntegerToNumericString( Author->getSerialNumber() );
+
+    OUStringBuffer aStrBuffer;
+    ::comphelper::Base64::encode(aStrBuffer, Author->getEncoded());
+    aNewCert[ 2 ] = aStrBuffer.makeStringAndClear();
+
+
+    Sequence< SvtSecurityOptions::Certificate > aTrustedAuthors = aSecOpts.GetTrustedAuthors();
+    sal_Int32 nCnt = aTrustedAuthors.getLength();
+    aTrustedAuthors.realloc( nCnt + 1 );
+    aTrustedAuthors[ nCnt ] = aNewCert;
+
+    aSecOpts.SetTrustedAuthors( aTrustedAuthors );
+}
+
+void DocumentDigitalSignatures::addLocationToTrustedSources( const OUString& Location )
+{
+    SvtSecurityOptions aSecOpt;
+
+    Sequence< OUString > aSecURLs = aSecOpt.GetSecureURLs();
+    sal_Int32 nCnt = aSecURLs.getLength();
+    aSecURLs.realloc( nCnt + 1 );
+    aSecURLs[ nCnt ] = Location;
+
+    aSecOpt.SetSecureURLs( aSecURLs );
+}
+
+sal_Bool DocumentDigitalSignatures::signDocumentWithCertificate(
+            css::uno::Reference<css::security::XCertificate> const & xCertificate,
+            css::uno::Reference<css::embed::XStorage> const & xStorage,
+            css::uno::Reference<css::io::XStream> const & xStream)
+{
+    return signWithCertificateImpl(xCertificate, xStorage, xStream, DocumentSignatureMode::Content);
+}
+
+sal_Bool DocumentDigitalSignatures::signPackageWithCertificate(
+    css::uno::Reference<css::security::XCertificate> const& xCertificate,
+    css::uno::Reference<css::embed::XStorage> const& xStorage,
+    css::uno::Reference<css::io::XStream> const& xStream)
+{
+    return signWithCertificateImpl(xCertificate, xStorage, xStream, DocumentSignatureMode::Package);
+}
+
+sal_Bool DocumentDigitalSignatures::signScriptingContentWithCertificate(
+    css::uno::Reference<css::security::XCertificate> const& xCertificate,
+    css::uno::Reference<css::embed::XStorage> const& xStorage,
+    css::uno::Reference<css::io::XStream> const& xStream)
+{
+    return signWithCertificateImpl(xCertificate, xStorage, xStream, DocumentSignatureMode::Macros);
+}
+
+bool DocumentDigitalSignatures::signWithCertificateImpl(
+    css::uno::Reference<css::security::XCertificate> const& xCertificate,
+    css::uno::Reference<css::embed::XStorage> const& xStorage,
+    css::uno::Reference<css::io::XStream> const& xStream,
+    DocumentSignatureMode eMode)
+{
+    OSL_ENSURE(!m_sODFVersion.isEmpty(),
+               "DocumentDigitalSignatures: ODF Version not set, assuming minimum 1.2");
+
+    DocumentSignatureManager aSignatureManager(mxCtx, eMode);
+
+    if (!aSignatureManager.init())
+        return false;
+
+    aSignatureManager.setStore(xStorage);
+    aSignatureManager.getSignatureHelper().SetStorage(xStorage, m_sODFVersion);
+    aSignatureManager.setSignatureStream(xStream);
+
+    Reference<XXMLSecurityContext> xSecurityContext = aSignatureManager.getSecurityContext();
+
+    sal_Int32 nSecurityId;
+
+    bool bSuccess = aSignatureManager.add(xCertificate, xSecurityContext, "", nSecurityId, true);
+    if (!bSuccess)
+        return false;
+
+    aSignatureManager.read(/*bUseTempStream=*/true, /*bCacheLastSignature=*/false);
+    aSignatureManager.write(true);
+
+    if (xStorage.is() && !xStream.is())
+    {
+        uno::Reference<embed::XTransactedObject> xTransaction(xStorage, uno::UNO_QUERY);
+        xTransaction->commit();
+    }
+
+    return true;
+}
+
+extern "C" SAL_DLLPUBLIC_EXPORT uno::XInterface*
+com_sun_star_security_DocumentDigitalSignatures_get_implementation(
+    uno::XComponentContext* pCtx, uno::Sequence<uno::Any> const& /*rSeq*/)
+{
+    return cppu::acquire(
+        new DocumentDigitalSignatures(uno::Reference<uno::XComponentContext>(pCtx)));
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/dialogs/certificatechooser.cxx b/xmlsecurity/source/dialogs/certificatechooser.cxx
new file mode 100644
index 000000000..f0ba29b08
--- /dev/null
+++ b/xmlsecurity/source/dialogs/certificatechooser.cxx
@@ -0,0 +1,330 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <config_gpgme.h>
+#include <certificatechooser.hxx>
+#include <certificateviewer.hxx>
+#include <com/sun/star/xml/crypto/XSecurityEnvironment.hpp>
+#include <com/sun/star/xml/crypto/XXMLSecurityContext.hpp>
+#include <comphelper/sequence.hxx>
+#include <comphelper/xmlsechelper.hxx>
+
+#include <com/sun/star/security/NoPasswordException.hpp>
+#include <com/sun/star/security/CertificateCharacters.hpp>
+
+#include <unotools/datetime.hxx>
+#include <unotools/useroptions.hxx>
+
+#include <resourcemanager.hxx>
+#include <strings.hrc>
+
+using namespace comphelper;
+using namespace css;
+
+CertificateChooser::CertificateChooser(weld::Window* _pParent,
+                                       std::vector< css::uno::Reference< css::xml::crypto::XXMLSecurityContext > > const & rxSecurityContexts,
+                                       UserAction eAction)
+    : GenericDialogController(_pParent, "xmlsec/ui/selectcertificatedialog.ui", "SelectCertificateDialog")
+    , mvUserData()
+    , meAction(eAction)
+    , m_xFTSign(m_xBuilder->weld_label("sign"))
+    , m_xFTEncrypt(m_xBuilder->weld_label("encrypt"))
+    , m_xCertLB(m_xBuilder->weld_tree_view("signatures"))
+    , m_xViewBtn(m_xBuilder->weld_button("viewcert"))
+    , m_xOKBtn(m_xBuilder->weld_button("ok"))
+    , m_xFTDescription(m_xBuilder->weld_label("description-label"))
+    , m_xDescriptionED(m_xBuilder->weld_entry("description"))
+{
+    auto nControlWidth = m_xCertLB->get_approximate_digit_width() * 105;
+    m_xCertLB->set_size_request(nControlWidth, m_xCertLB->get_height_rows(12));
+
+    std::vector<int> aWidths;
+    aWidths.push_back(30*nControlWidth/100);
+    aWidths.push_back(30*nControlWidth/100);
+    aWidths.push_back(10*nControlWidth/100);
+    aWidths.push_back(20*nControlWidth/100);
+    m_xCertLB->set_column_fixed_widths(aWidths);
+    m_xCertLB->connect_changed( LINK( this, CertificateChooser, CertificateHighlightHdl ) );
+    m_xCertLB->connect_row_activated( LINK( this, CertificateChooser, CertificateSelectHdl ) );
+    m_xViewBtn->connect_clicked( LINK( this, CertificateChooser, ViewButtonHdl ) );
+
+    mxSecurityContexts = rxSecurityContexts;
+    mbInitialized = false;
+
+    // disable buttons
+    CertificateHighlightHdl(*m_xCertLB);
+}
+
+CertificateChooser::~CertificateChooser()
+{
+}
+
+short CertificateChooser::run()
+{
+    // #i48432#
+    // We can't check for personal certificates before raising this dialog,
+    // because the mozilla implementation throws a NoPassword exception,
+    // if the user pressed cancel, and also if the database does not exist!
+    // But in the later case, the is no password query, and the user is confused
+    // that nothing happens when pressing "Add..." in the SignatureDialog.
+
+    // PostUserEvent( LINK( this, CertificateChooser, Initialize ) );
+
+    // PostUserLink behavior is too slow, so do it directly before Execute().
+    // Problem: This Dialog should be visible right now, and the parent should not be accessible.
+    // Show, Update, DisableInput...
+
+    m_xDialog->show();
+    ImplInitialize();
+    return GenericDialogController::run();
+}
+
+void CertificateChooser::HandleOneUsageBit(OUString& string, int& bits, int bit, const char *pResId)
+{
+    if (bits & bit)
+    {
+        if (!string.isEmpty())
+            string += ", ";
+        string += XsResId(pResId);
+        bits &= ~bit;
+    }
+}
+
+OUString CertificateChooser::UsageInClearText(int bits)
+{
+    OUString result;
+
+    HandleOneUsageBit(result, bits, 0x80, STR_DIGITAL_SIGNATURE);
+    HandleOneUsageBit(result, bits, 0x40, STR_NON_REPUDIATION);
+    HandleOneUsageBit(result, bits, 0x20, STR_KEY_ENCIPHERMENT);
+    HandleOneUsageBit(result, bits, 0x10, STR_DATA_ENCIPHERMENT);
+    HandleOneUsageBit(result, bits, 0x08, STR_KEY_AGREEMENT);
+    HandleOneUsageBit(result, bits, 0x04, STR_KEY_CERT_SIGN);
+    HandleOneUsageBit(result, bits, 0x02, STR_CRL_SIGN);
+    HandleOneUsageBit(result, bits, 0x01, STR_ENCIPHER_ONLY);
+
+    // Check for mystery leftover bits
+    if (bits != 0)
+    {
+        if (!result.isEmpty())
+            result += ", ";
+        result += "0x" + OUString::number(bits, 16);
+    }
+
+    return result;
+}
+
+void CertificateChooser::ImplInitialize()
+{
+    if ( mbInitialized )
+        return;
+
+    SvtUserOptions aUserOpts;
+
+    switch (meAction)
+    {
+        case UserAction::Sign:
+            m_xFTSign->show();
+            m_xOKBtn->set_label(XsResId(STR_SIGN));
+            msPreferredKey = aUserOpts.GetSigningKey();
+            break;
+
+        case UserAction::SelectSign:
+            m_xFTSign->show();
+            m_xOKBtn->set_label(XsResId(STR_SELECTSIGN));
+            msPreferredKey = aUserOpts.GetSigningKey();
+            break;
+
+        case UserAction::Encrypt:
+            m_xFTEncrypt->show();
+            m_xFTDescription->hide();
+            m_xDescriptionED->hide();
+            m_xCertLB->set_selection_mode(SelectionMode::Multiple);
+            m_xOKBtn->set_label(XsResId(STR_ENCRYPT));
+            msPreferredKey = aUserOpts.GetEncryptionKey();
+            break;
+
+    }
+
+    for (auto &secContext : mxSecurityContexts)
+    {
+        if (!secContext.is())
+            continue;
+        auto secEnvironment = secContext->getSecurityEnvironment();
+        if (!secEnvironment.is())
+            continue;
+
+        uno::Sequence< uno::Reference< security::XCertificate > > xCerts;
+        try
+        {
+            if ( meAction == UserAction::Sign || meAction == UserAction::SelectSign)
+                xCerts = secEnvironment->getPersonalCertificates();
+            else
+                xCerts = secEnvironment->getAllCertificates();
+        }
+        catch (security::NoPasswordException&)
+        {
+        }
+
+        for( sal_Int32 nCert = xCerts.getLength(); nCert; )
+        {
+            uno::Reference< security::XCertificate > xCert = xCerts[ --nCert ];
+            // Check if we have a private key for this...
+            long nCertificateCharacters = secEnvironment->getCertificateCharacters(xCert);
+
+            if (!(nCertificateCharacters & security::CertificateCharacters::HAS_PRIVATE_KEY))
+            {
+                ::comphelper::removeElementAt( xCerts, nCert );
+            }
+        }
+
+
+        // fill list of certificates; the first entry will be selected
+        for ( const auto& xCert : std::as_const(xCerts) )
+        {
+            std::shared_ptr<UserData> userData = std::make_shared<UserData>();
+            userData->xCertificate = xCert;
+            userData->xSecurityContext = secContext;
+            userData->xSecurityEnvironment = secEnvironment;
+            mvUserData.push_back(userData);
+
+            OUString sIssuer = xmlsec::GetContentPart( xCert->getIssuerName(), xCert->getCertificateKind());
+
+            m_xCertLB->append();
+            int nRow = m_xCertLB->n_children() - 1;
+            m_xCertLB->set_text(nRow, xmlsec::GetContentPart(xCert->getSubjectName(), xCert->getCertificateKind()), 0);
+            m_xCertLB->set_text(nRow, sIssuer, 1);
+            m_xCertLB->set_text(nRow, xmlsec::GetCertificateKind(xCert->getCertificateKind()), 2);
+            m_xCertLB->set_text(nRow, utl::GetDateString(xCert->getNotValidAfter()), 3);
+            m_xCertLB->set_text(nRow, UsageInClearText(xCert->getCertificateUsage()), 4);
+            OUString sId(OUString::number(reinterpret_cast<sal_Int64>(userData.get())));
+            m_xCertLB->set_id(nRow, sId);
+
+#if HAVE_FEATURE_GPGME
+            // only GPG has preferred keys
+            if ( !sIssuer.isEmpty() && !msPreferredKey.isEmpty() ) {
+                if ( sIssuer == msPreferredKey )
+                {
+                    if ( meAction == UserAction::Sign || meAction == UserAction::SelectSign )
+                        m_xCertLB->select(nRow);
+                    else if ( meAction == UserAction::Encrypt &&
+                              aUserOpts.GetEncryptToSelf() )
+                        mxEncryptToSelf = xCert;
+                }
+            }
+#endif
+        }
+    }
+
+    // enable/disable buttons
+    CertificateHighlightHdl(*m_xCertLB);
+    mbInitialized = true;
+}
+
+uno::Sequence<uno::Reference< css::security::XCertificate > > CertificateChooser::GetSelectedCertificates()
+{
+    std::vector< uno::Reference< css::security::XCertificate > > aRet;
+    if (meAction == UserAction::Encrypt)
+    {
+        // for encryption, multiselection is enabled
+        m_xCertLB->selected_foreach([this, &aRet](weld::TreeIter& rEntry){
+            UserData* userData = reinterpret_cast<UserData*>(m_xCertLB->get_id(rEntry).toInt64());
+            aRet.push_back( userData->xCertificate );
+            return false;
+        });
+    }
+    else
+    {
+        uno::Reference< css::security::XCertificate > xCert;
+        int nSel = m_xCertLB->get_selected_index();
+        if (nSel != -1)
+        {
+            UserData* userData = reinterpret_cast<UserData*>(m_xCertLB->get_id(nSel).toInt64());
+            xCert = userData->xCertificate;
+        }
+        aRet.push_back( xCert );
+    }
+
+#if HAVE_FEATURE_GPGME
+    if ( mxEncryptToSelf.is())
+        aRet.push_back( mxEncryptToSelf );
+#endif
+
+    return comphelper::containerToSequence(aRet);
+}
+
+uno::Reference<xml::crypto::XXMLSecurityContext> CertificateChooser::GetSelectedSecurityContext() const
+{
+    int nSel = m_xCertLB->get_selected_index();
+    if (nSel == -1)
+        return uno::Reference<xml::crypto::XXMLSecurityContext>();
+
+    UserData* userData = reinterpret_cast<UserData*>(m_xCertLB->get_id(nSel).toInt64());
+    uno::Reference<xml::crypto::XXMLSecurityContext> xCert = userData->xSecurityContext;
+    return xCert;
+}
+
+OUString CertificateChooser::GetDescription() const
+{
+    return m_xDescriptionED->get_text();
+}
+
+OUString CertificateChooser::GetUsageText()
+{
+    uno::Sequence< uno::Reference<css::security::XCertificate> > xCerts =
+        GetSelectedCertificates();
+    return (xCerts.hasElements() && xCerts[0].is()) ?
+        UsageInClearText(xCerts[0]->getCertificateUsage()) : OUString();
+}
+
+IMPL_LINK_NOARG(CertificateChooser, CertificateHighlightHdl, weld::TreeView&, void)
+{
+    bool bEnable = m_xCertLB->get_selected_index() != -1;
+    m_xViewBtn->set_sensitive(bEnable);
+    m_xOKBtn->set_sensitive(bEnable);
+    m_xDescriptionED->set_sensitive(bEnable);
+}
+
+IMPL_LINK_NOARG(CertificateChooser, CertificateSelectHdl, weld::TreeView&, bool)
+{
+    m_xDialog->response(RET_OK);
+    return true;
+}
+
+IMPL_LINK_NOARG(CertificateChooser, ViewButtonHdl, weld::Button&, void)
+{
+    ImplShowCertificateDetails();
+}
+
+void CertificateChooser::ImplShowCertificateDetails()
+{
+    int nSel = m_xCertLB->get_selected_index();
+    if (nSel == -1)
+        return;
+
+    UserData* userData = reinterpret_cast<UserData*>(m_xCertLB->get_id(nSel).toInt64());
+
+    if (!userData->xSecurityEnvironment.is() || !userData->xCertificate.is())
+        return;
+
+    CertificateViewer aViewer(m_xDialog.get(), userData->xSecurityEnvironment, userData->xCertificate, true, this);
+    aViewer.run();
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/dialogs/certificateviewer.cxx b/xmlsecurity/source/dialogs/certificateviewer.cxx
new file mode 100644
index 000000000..da924838c
--- /dev/null
+++ b/xmlsecurity/source/dialogs/certificateviewer.cxx
@@ -0,0 +1,364 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <certificatechooser.hxx>
+#include <certificateviewer.hxx>
+#include <com/sun/star/security/XCertificate.hpp>
+
+#include <com/sun/star/security/CertificateCharacters.hpp>
+#include <com/sun/star/xml/crypto/XSecurityEnvironment.hpp>
+#include <com/sun/star/security/CertificateValidity.hpp>
+
+#include <unotools/localedatawrapper.hxx>
+#include <unotools/datetime.hxx>
+
+#include <strings.hrc>
+#include <resourcemanager.hxx>
+#include <comphelper/xmlsechelper.hxx>
+#include <tools/datetime.hxx>
+#include <bitmaps.hlst>
+
+#include <vcl/settings.hxx>
+#include <vcl/svapp.hxx>
+
+using namespace comphelper;
+using namespace ::com::sun::star;
+using namespace ::com::sun::star::uno;
+
+CertificateViewer::CertificateViewer(weld::Window* _pParent,
+        const css::uno::Reference< css::xml::crypto::XSecurityEnvironment >& _rxSecurityEnvironment,
+        const css::uno::Reference< css::security::XCertificate >& _rXCert, bool bCheckForPrivateKey,
+        CertificateChooser* pParentChooser)
+    : GenericDialogController(_pParent, "xmlsec/ui/viewcertdialog.ui", "ViewCertDialog")
+    , mbCheckForPrivateKey(bCheckForPrivateKey)
+    , mpParentChooser(pParentChooser)
+    , mxTabCtrl(m_xBuilder->weld_notebook("tabcontrol"))
+{
+    mxTabCtrl->connect_enter_page(LINK(this, CertificateViewer, ActivatePageHdl));
+
+    mxSecurityEnvironment = _rxSecurityEnvironment;
+    mxCert = _rXCert;
+
+    mxGeneralPage.reset(new CertificateViewerGeneralTP(mxTabCtrl->get_page("general"), this));
+    mxDetailsPage.reset(new CertificateViewerDetailsTP(mxTabCtrl->get_page("details"), this));
+    if (!mxSecurityEnvironment->buildCertificatePath(mxCert).hasElements())
+        mxTabCtrl->remove_page("path");
+    else
+        mxPathId.reset(new CertificateViewerCertPathTP(mxTabCtrl->get_page("path"), this));
+    mxTabCtrl->set_current_page("general");
+}
+
+IMPL_LINK(CertificateViewer, ActivatePageHdl, const OString&, rPage, void)
+{
+    if (rPage == "path")
+        mxPathId->ActivatePage();
+}
+
+CertificateViewerTP::CertificateViewerTP(weld::Container* pParent, const OUString& rUIXMLDescription,
+                                         const OString& rID, CertificateViewer* pDlg)
+    : mxBuilder(Application::CreateBuilder(pParent, rUIXMLDescription))
+    , mxContainer(mxBuilder->weld_container(rID))
+    , mpDlg(pDlg)
+{
+}
+
+CertificateViewerGeneralTP::CertificateViewerGeneralTP(weld::Container* pParent, CertificateViewer* pDlg)
+    : CertificateViewerTP(pParent, "xmlsec/ui/certgeneral.ui", "CertGeneral", pDlg)
+    , m_xCertImg(mxBuilder->weld_image("certimage"))
+    , m_xHintNotTrustedFT(mxBuilder->weld_label("hintnotrust"))
+    , m_xIssuedToLabelFT(mxBuilder->weld_label("issued_to"))
+    , m_xIssuedToFT(mxBuilder->weld_label("issued_to_value"))
+    , m_xIssuedByLabelFT(mxBuilder->weld_label("issued_by"))
+    , m_xIssuedByFT(mxBuilder->weld_label("issued_by_value"))
+    , m_xValidFromDateFT(mxBuilder->weld_label("valid_from_value"))
+    , m_xValidToDateFT(mxBuilder->weld_label("valid_to_value"))
+    , m_xKeyImg(mxBuilder->weld_image("keyimage"))
+    , m_xHintCorrespPrivKeyFT(mxBuilder->weld_label("privatekey"))
+{
+    //Verify the certificate
+    sal_Int32 certStatus = mpDlg->mxSecurityEnvironment->verifyCertificate(mpDlg->mxCert,
+         Sequence<Reference<css::security::XCertificate> >());
+
+    bool bCertValid = certStatus == css::security::CertificateValidity::VALID;
+
+    if ( !bCertValid )
+    {
+        m_xCertImg->set_from_icon_name(BMP_STATE_NOT_VALIDATED);
+        m_xHintNotTrustedFT->set_label(XsResId(STR_CERTIFICATE_NOT_VALIDATED));
+    }
+
+    // insert data
+    css::uno::Reference< css::security::XCertificate > xCert = mpDlg->mxCert;
+
+    OUString sSubjectName(xmlsec::GetContentPart(xCert->getSubjectName(), xCert->getCertificateKind()));
+    if (!sSubjectName.isEmpty())
+        m_xIssuedToFT->set_label(sSubjectName);
+    else
+        m_xIssuedToLabelFT->hide();
+    OUString sIssuerName(xmlsec::GetContentPart(xCert->getIssuerName(), xCert->getCertificateKind()));
+    if (!sIssuerName.isEmpty())
+        m_xIssuedByFT->set_label(sIssuerName);
+    else
+        m_xIssuedByLabelFT->hide();
+
+    DateTime aDateTimeStart( DateTime::EMPTY );
+    DateTime aDateTimeEnd( DateTime::EMPTY );
+    utl::typeConvert( xCert->getNotValidBefore(), aDateTimeStart );
+    utl::typeConvert( xCert->getNotValidAfter(), aDateTimeEnd );
+
+    OUString sValidFromDate = Application::GetSettings().GetUILocaleDataWrapper().getDate(Date(aDateTimeStart.GetDate()));
+    OUString sValidToDate = Application::GetSettings().GetUILocaleDataWrapper().getDate(Date(aDateTimeEnd.GetDate()));
+
+    m_xValidFromDateFT->set_label(sValidFromDate);
+    m_xValidToDateFT->set_label(sValidToDate);
+
+    // Check if we have the private key...
+    bool bHasPrivateKey = false;
+    // #i41270# Check only if we have that certificate in our security environment
+    if (pDlg->mbCheckForPrivateKey)
+    {
+        long nCertificateCharacters = pDlg->mxSecurityEnvironment->getCertificateCharacters(xCert);
+        bHasPrivateKey = (nCertificateCharacters & security::CertificateCharacters::HAS_PRIVATE_KEY);
+    }
+    if (!bHasPrivateKey)
+    {
+        m_xKeyImg->hide();
+        m_xHintCorrespPrivKeyFT->hide();
+    }
+}
+
+void CertificateViewerDetailsTP::InsertElement(const OUString& rField, const OUString& rValue,
+                                               const OUString& rDetails, bool bFixedWidthFont)
+{
+    m_aUserData.emplace_back(std::make_unique<Details_UserDatat>(rDetails, bFixedWidthFont));
+    OUString sId(OUString::number(reinterpret_cast<sal_Int64>(m_aUserData.back().get())));
+    m_xElementsLB->append(sId, rField);
+    m_xElementsLB->set_text(m_xElementsLB->n_children() -1, rValue, 1);
+}
+
+CertificateViewerDetailsTP::CertificateViewerDetailsTP(weld::Container* pParent, CertificateViewer* pDlg)
+    : CertificateViewerTP(pParent, "xmlsec/ui/certdetails.ui", "CertDetails", pDlg)
+    , m_xElementsLB(mxBuilder->weld_tree_view("tablecontainer"))
+    , m_xValueDetails(mxBuilder->weld_text_view("valuedetails"))
+{
+    const int nWidth = m_xElementsLB->get_approximate_digit_width() * 60;
+    const int nHeight = m_xElementsLB->get_height_rows(8);
+    m_xElementsLB->set_size_request(nWidth, nHeight);
+    m_xValueDetails->set_size_request(nWidth, nHeight);
+    std::vector<int> aWidths;
+    aWidths.push_back(nWidth / 2);
+    m_xElementsLB->set_column_fixed_widths(aWidths);
+
+    // fill list box
+    Reference< security::XCertificate > xCert = mpDlg->mxCert;
+    sal_uInt16                  nLineBreak = 16;
+    const char* const pHexSep = " ";
+    OUString                aLBEntry;
+    OUString                aDetails;
+    // Certificate Versions are reported wrong (#i35107#) - 0 == "V1", 1 == "V2", ..., n = "V(n+1)"
+    aLBEntry = "V" + OUString::number( xCert->getVersion() + 1 );
+    InsertElement( XsResId( STR_VERSION ), aLBEntry, aLBEntry );
+    Sequence< sal_Int8 >    aSeq = xCert->getSerialNumber();
+    aLBEntry = xmlsec::GetHexString( aSeq, pHexSep );
+    aDetails = xmlsec::GetHexString( aSeq, pHexSep, nLineBreak );
+    InsertElement( XsResId( STR_SERIALNUM ), aLBEntry, aDetails, true );
+
+    std::pair< OUString, OUString> pairIssuer =
+        xmlsec::GetDNForCertDetailsView(xCert->getIssuerName());
+    aLBEntry = pairIssuer.first;
+    aDetails = pairIssuer.second;
+    InsertElement( XsResId( STR_ISSUER ), aLBEntry, aDetails );
+
+    DateTime aDateTime( DateTime::EMPTY );
+    utl::typeConvert( xCert->getNotValidBefore(), aDateTime );
+    aLBEntry = Application::GetSettings().GetUILocaleDataWrapper().getDate(Date(aDateTime.GetDate())) + " ";
+    aLBEntry += Application::GetSettings().GetUILocaleDataWrapper().getTime(tools::Time(aDateTime.GetTime()));
+    InsertElement( XsResId( STR_VALIDFROM ), aLBEntry, aLBEntry  );
+    utl::typeConvert( xCert->getNotValidAfter(), aDateTime );
+    aLBEntry = Application::GetSettings().GetUILocaleDataWrapper().getDate(Date(aDateTime.GetDate()) ) + " ";
+    aLBEntry += Application::GetSettings().GetUILocaleDataWrapper().getTime(tools::Time(aDateTime.GetTime()));
+    InsertElement( XsResId( STR_VALIDTO ), aLBEntry, aLBEntry );
+
+    std::pair< OUString, OUString > pairSubject =
+        xmlsec::GetDNForCertDetailsView(xCert->getSubjectName());
+    aLBEntry = pairSubject.first;
+    aDetails = pairSubject.second;
+    InsertElement( XsResId( STR_SUBJECT ), aLBEntry, aDetails );
+
+    aLBEntry = aDetails = xCert->getSubjectPublicKeyAlgorithm();
+    InsertElement( XsResId( STR_SUBJECT_PUBKEY_ALGO ), aLBEntry, aDetails );
+    aSeq = xCert->getSubjectPublicKeyValue();
+    aLBEntry = xmlsec::GetHexString( aSeq, pHexSep );
+    aDetails = xmlsec::GetHexString( aSeq, pHexSep, nLineBreak );
+    InsertElement( XsResId( STR_SUBJECT_PUBKEY_VAL ), aLBEntry, aDetails, true );
+
+    aLBEntry = aDetails = xCert->getSignatureAlgorithm();
+    InsertElement( XsResId( STR_SIGNATURE_ALGO ), aLBEntry, aDetails );
+
+    CertificateChooser* pChooser = mpDlg->GetParentChooser();
+    if (pChooser)
+    {
+        aLBEntry = CertificateChooser::UsageInClearText( mpDlg->mxCert->getCertificateUsage() );
+        InsertElement( XsResId( STR_USE ), aLBEntry, aLBEntry );
+    }
+
+    aSeq = xCert->getSHA1Thumbprint();
+    aLBEntry = xmlsec::GetHexString( aSeq, pHexSep );
+    aDetails = xmlsec::GetHexString( aSeq, pHexSep, nLineBreak );
+    InsertElement( XsResId( STR_THUMBPRINT_SHA1 ), aLBEntry, aDetails, true );
+
+    aSeq = xCert->getMD5Thumbprint();
+    aLBEntry = xmlsec::GetHexString( aSeq, pHexSep );
+    aDetails = xmlsec::GetHexString( aSeq, pHexSep, nLineBreak );
+    InsertElement( XsResId( STR_THUMBPRINT_MD5 ), aLBEntry, aDetails, true );
+
+    m_xElementsLB->connect_changed(LINK(this, CertificateViewerDetailsTP, ElementSelectHdl));
+}
+
+IMPL_LINK_NOARG(CertificateViewerDetailsTP, ElementSelectHdl, weld::TreeView&, void)
+{
+    int nEntry = m_xElementsLB->get_selected_index();
+    OUString aElementText;
+    bool bFixedWidthFont;
+    if (nEntry != -1)
+    {
+        const Details_UserDatat* p = reinterpret_cast<Details_UserDatat*>(m_xElementsLB->get_id(nEntry).toInt64());
+        aElementText = p->maTxt;
+        bFixedWidthFont = p->mbFixedWidthFont;
+    }
+    else
+        bFixedWidthFont = false;
+
+    m_xValueDetails->set_monospace(bFixedWidthFont);
+    m_xValueDetails->set_text(aElementText);
+}
+
+CertificateViewerCertPathTP::CertificateViewerCertPathTP(weld::Container* pParent, CertificateViewer* pDlg)
+    : CertificateViewerTP(pParent, "xmlsec/ui/certpage.ui", "CertPage", pDlg)
+    , mpParent(pDlg)
+    , mbFirstActivateDone(false)
+    , mxCertPathLB(mxBuilder->weld_tree_view("signatures"))
+    , mxViewCertPB(mxBuilder->weld_button("viewcert"))
+    , mxCertStatusML(mxBuilder->weld_text_view("status"))
+    , mxCertOK(mxBuilder->weld_label("certok"))
+    , mxCertNotValidated(mxBuilder->weld_label("certnotok"))
+{
+    const int nWidth = mxCertPathLB->get_approximate_digit_width() * 60;
+    const int nHeight = mxCertPathLB->get_height_rows(6);
+    mxCertPathLB->set_size_request(nWidth, nHeight);
+    mxCertStatusML->set_size_request(nWidth, nHeight);
+
+    mxCertPathLB->connect_changed( LINK( this, CertificateViewerCertPathTP, CertSelectHdl ) );
+    mxViewCertPB->connect_clicked( LINK( this, CertificateViewerCertPathTP, ViewCertHdl ) );
+}
+
+void CertificateViewerCertPathTP::ActivatePage()
+{
+    if ( !mbFirstActivateDone )
+    {
+        mbFirstActivateDone = true;
+        Sequence< Reference< security::XCertificate > > aCertPath =
+            mpParent->mxSecurityEnvironment->buildCertificatePath( mpParent->mxCert );
+        const Reference< security::XCertificate >* pCertPath = aCertPath.getConstArray();
+
+        sal_Int32 i, nCnt = aCertPath.getLength();
+        std::unique_ptr<weld::TreeIter> xParent;
+        for (i = nCnt-1; i >= 0; i--)
+        {
+            const Reference< security::XCertificate > rCert = pCertPath[ i ];
+            OUString sName = xmlsec::GetContentPart( rCert->getSubjectName(), rCert->getCertificateKind() );
+            //Verify the certificate
+            sal_Int32 certStatus = mpDlg->mxSecurityEnvironment->verifyCertificate(rCert,
+                 Sequence<Reference<css::security::XCertificate> >());
+            bool bCertValid = certStatus == css::security::CertificateValidity::VALID;
+            InsertCert(xParent.get(), sName, rCert, bCertValid);
+            if (!xParent)
+            {
+                xParent = mxCertPathLB->make_iterator();
+                (void)mxCertPathLB->get_iter_first(*xParent);
+            }
+            else
+            {
+                (void)mxCertPathLB->iter_children(*xParent);
+            }
+        }
+
+        if (xParent)
+            mxCertPathLB->select(*xParent);
+        mxViewCertPB->set_sensitive(false); // Own certificate selected
+
+        while (xParent)
+        {
+            mxCertPathLB->expand_row(*xParent);
+            if (!mxCertPathLB->iter_parent(*xParent))
+                xParent.reset();
+        }
+
+        CertSelectHdl(*mxCertPathLB);
+    }
+}
+
+IMPL_LINK_NOARG(CertificateViewerCertPathTP, ViewCertHdl, weld::Button&, void)
+{
+    std::unique_ptr<weld::TreeIter> xIter = mxCertPathLB->make_iterator();
+    if (mxCertPathLB->get_selected(xIter.get()))
+    {
+        CertPath_UserData* pData = reinterpret_cast<CertPath_UserData*>(mxCertPathLB->get_id(*xIter).toInt64());
+        CertificateViewer aViewer(mpDlg->getDialog(), mpDlg->mxSecurityEnvironment,
+                pData->mxCert, false, nullptr);
+        aViewer.run();
+    }
+}
+
+IMPL_LINK_NOARG(CertificateViewerCertPathTP, CertSelectHdl, weld::TreeView&, void)
+{
+    OUString sStatus;
+
+    std::unique_ptr<weld::TreeIter> xIter = mxCertPathLB->make_iterator();
+    bool bEntry = mxCertPathLB->get_selected(xIter.get());
+    if (bEntry)
+    {
+        CertPath_UserData* pData = reinterpret_cast<CertPath_UserData*>(mxCertPathLB->get_id(*xIter).toInt64());
+        if (pData)
+            sStatus = pData->mbValid ? mxCertOK->get_label() : mxCertNotValidated->get_label();
+    }
+
+    mxCertStatusML->set_text(sStatus);
+
+    bool bSensitive = false;
+    if (bEntry)
+    {
+        // if has children, so not the last one in the chain
+        if (mxCertPathLB->iter_children(*xIter))
+            bSensitive = true;
+    }
+    mxViewCertPB->set_sensitive(bSensitive);
+}
+
+void CertificateViewerCertPathTP::InsertCert(const weld::TreeIter* pParent, const OUString& rName,
+                                             const css::uno::Reference< css::security::XCertificate >& rxCert,
+                                             bool bValid)
+{
+    OUString sImage = bValid ? OUStringLiteral(BMP_CERT_OK) : OUStringLiteral(BMP_CERT_NOT_OK);
+    maUserData.emplace_back(std::make_unique<CertPath_UserData>(rxCert, bValid));
+    OUString sId(OUString::number(reinterpret_cast<sal_Int64>(maUserData.back().get())));
+    mxCertPathLB->insert(pParent, -1, &rName, &sId, nullptr, nullptr, &sImage, false, nullptr);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/dialogs/digitalsignaturesdialog.cxx b/xmlsecurity/source/dialogs/digitalsignaturesdialog.cxx
new file mode 100644
index 000000000..ef67c7167
--- /dev/null
+++ b/xmlsecurity/source/dialogs/digitalsignaturesdialog.cxx
@@ -0,0 +1,769 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <digitalsignaturesdialog.hxx>
+#include <certificatechooser.hxx>
+#include <certificateviewer.hxx>
+#include <biginteger.hxx>
+#include <sax/tools/converter.hxx>
+
+#include <com/sun/star/embed/XStorage.hpp>
+#include <com/sun/star/embed/ElementModes.hpp>
+#include <com/sun/star/embed/StorageFormats.hpp>
+#include <com/sun/star/container/XNameAccess.hpp>
+#include <com/sun/star/lang/XComponent.hpp>
+#include <com/sun/star/security/NoPasswordException.hpp>
+#include <com/sun/star/lang/DisposedException.hpp>
+#include <com/sun/star/beans/XPropertySet.hpp>
+#include <com/sun/star/security/CertificateValidity.hpp>
+#include <com/sun/star/packages/WrongPasswordException.hpp>
+#include <com/sun/star/security/CertificateKind.hpp>
+#include <com/sun/star/security/XDocumentDigitalSignatures.hpp>
+#include <com/sun/star/xml/dom/XDocumentBuilder.hpp>
+#include <com/sun/star/system/SystemShellExecute.hpp>
+#include <com/sun/star/system/SystemShellExecuteFlags.hpp>
+#include <com/sun/star/system/SystemShellExecuteException.hpp>
+
+#include <osl/file.hxx>
+#include <rtl/ustrbuf.hxx>
+#include <rtl/uri.hxx>
+#include <sal/log.hxx>
+
+#include <tools/date.hxx>
+#include <tools/time.hxx>
+#include <unotools/datetime.hxx>
+
+#include <bitmaps.hlst>
+#include <strings.hrc>
+#include <resourcemanager.hxx>
+#include <comphelper/xmlsechelper.hxx>
+#include <comphelper/processfactory.hxx>
+
+#include <vcl/weld.hxx>
+#include <vcl/svapp.hxx>
+#include <unotools/configitem.hxx>
+
+#ifdef _WIN32
+#include <o3tl/char16_t2wchar_t.hxx>
+#include <prewin.h>
+#include <Shlobj.h>
+#endif
+
+using namespace comphelper;
+using namespace css::security;
+using namespace css::uno;
+using namespace css;
+
+namespace
+{
+    class SaveODFItem: public utl::ConfigItem
+    {
+    private:
+        sal_Int16 m_nODF;
+
+        virtual void ImplCommit() override;
+
+    public:
+    virtual void Notify( const css::uno::Sequence< OUString >& aPropertyNames ) override;
+        SaveODFItem();
+        //See group ODF in Common.xcs
+        bool isLessODF1_2() const
+        {
+            return m_nODF < 3;
+        }
+    };
+
+    void SaveODFItem::ImplCommit() {}
+    void SaveODFItem::Notify( const css::uno::Sequence< OUString >& ) {}
+
+    SaveODFItem::SaveODFItem(): utl::ConfigItem("Office.Common/Save"), m_nODF(0)
+    {
+        OUString sDef("ODF/DefaultVersion");
+        Sequence< css::uno::Any > aValues = GetProperties( Sequence<OUString>(&sDef,1) );
+        if ( aValues.getLength() != 1)
+            throw uno::RuntimeException(
+                "[xmlsecurity] Could not open property Office.Common/Save/ODF/DefaultVersion",
+                nullptr);
+
+        sal_Int16 nTmp = 0;
+        if ( !(aValues[0] >>= nTmp) )
+            throw uno::RuntimeException(
+                "[xmlsecurity]SaveODFItem::SaveODFItem(): Wrong Type!",
+                nullptr );
+
+        m_nODF = nTmp;
+    }
+}
+
+DigitalSignaturesDialog::DigitalSignaturesDialog(
+    weld::Window* pParent,
+    const uno::Reference< uno::XComponentContext >& rxCtx, DocumentSignatureMode eMode,
+    bool bReadOnly, const OUString& sODFVersion, bool bHasDocumentSignature)
+    : GenericDialogController(pParent, "xmlsec/ui/digitalsignaturesdialog.ui", "DigitalSignaturesDialog")
+    , maSignatureManager(rxCtx, eMode)
+    , m_sODFVersion (sODFVersion)
+    , m_bHasDocumentSignature(bHasDocumentSignature)
+    , m_bWarningShowSignMacro(false)
+    , m_xHintDocFT(m_xBuilder->weld_label("dochint"))
+    , m_xHintBasicFT(m_xBuilder->weld_label("macrohint"))
+    , m_xHintPackageFT(m_xBuilder->weld_label("packagehint"))
+    , m_xSignaturesLB(m_xBuilder->weld_tree_view("signatures"))
+    , m_xSigsValidImg(m_xBuilder->weld_image("validimg"))
+    , m_xSigsValidFI(m_xBuilder->weld_label("validft"))
+    , m_xSigsInvalidImg(m_xBuilder->weld_image("invalidimg"))
+    , m_xSigsInvalidFI(m_xBuilder->weld_label("invalidft"))
+    , m_xSigsNotvalidatedImg(m_xBuilder->weld_image("notvalidatedimg"))
+    , m_xSigsNotvalidatedFI(m_xBuilder->weld_label("notvalidatedft"))
+    , m_xSigsOldSignatureImg(m_xBuilder->weld_image("oldsignatureimg"))
+    , m_xSigsOldSignatureFI(m_xBuilder->weld_label("oldsignatureft"))
+    , m_xAdESCompliantCB(m_xBuilder->weld_check_button("adescompliant"))
+    , m_xViewBtn(m_xBuilder->weld_button("view"))
+    , m_xAddBtn(m_xBuilder->weld_button("sign"))
+    , m_xRemoveBtn(m_xBuilder->weld_button("remove"))
+    , m_xStartCertMgrBtn(m_xBuilder->weld_button("start_certmanager"))
+    , m_xCloseBtn(m_xBuilder->weld_button("close"))
+{
+    m_bAdESCompliant = !DocumentSignatureHelper::isODFPre_1_2(m_sODFVersion);
+
+    auto nControlWidth = m_xSignaturesLB->get_approximate_digit_width() * 105;
+    m_xSignaturesLB->set_size_request(nControlWidth, m_xSignaturesLB->get_height_rows(10));
+
+    // Give the first column 6 percent, try to distribute the rest equally.
+    std::vector<int> aWidths;
+    aWidths.push_back(6*nControlWidth/100);
+    auto nColWidth = (nControlWidth - aWidths[0]) / 4;
+    aWidths.push_back(nColWidth);
+    aWidths.push_back(nColWidth);
+    aWidths.push_back(nColWidth);
+    m_xSignaturesLB->set_column_fixed_widths(aWidths);
+
+    mbVerifySignatures = true;
+    mbSignaturesChanged = false;
+
+    m_xSignaturesLB->connect_changed( LINK( this, DigitalSignaturesDialog, SignatureHighlightHdl ) );
+    m_xSignaturesLB->connect_row_activated( LINK( this, DigitalSignaturesDialog, SignatureSelectHdl ) );
+
+    m_xAdESCompliantCB->connect_toggled( LINK( this, DigitalSignaturesDialog, AdESCompliantCheckBoxHdl ) );
+    m_xAdESCompliantCB->set_active(m_bAdESCompliant);
+
+    m_xViewBtn->connect_clicked( LINK( this, DigitalSignaturesDialog, ViewButtonHdl ) );
+    m_xViewBtn->set_sensitive(false);
+
+    m_xAddBtn->connect_clicked( LINK( this, DigitalSignaturesDialog, AddButtonHdl ) );
+    if ( bReadOnly  )
+        m_xAddBtn->set_sensitive(false);
+
+    m_xRemoveBtn->connect_clicked( LINK( this, DigitalSignaturesDialog, RemoveButtonHdl ) );
+    m_xRemoveBtn->set_sensitive(false);
+
+    m_xStartCertMgrBtn->connect_clicked( LINK( this, DigitalSignaturesDialog, CertMgrButtonHdl ) );
+
+    m_xCloseBtn->connect_clicked( LINK( this, DigitalSignaturesDialog, OKButtonHdl) );
+
+    switch( maSignatureManager.getSignatureMode() )
+    {
+        case DocumentSignatureMode::Content:
+            m_xHintDocFT->show();
+            break;
+        case DocumentSignatureMode::Macros:
+            m_xHintBasicFT->show();
+            break;
+        case DocumentSignatureMode::Package:
+            m_xHintPackageFT->show();
+            break;
+    }
+}
+
+DigitalSignaturesDialog::~DigitalSignaturesDialog()
+{
+}
+
+bool DigitalSignaturesDialog::Init()
+{
+    bool bInit = maSignatureManager.init();
+
+    SAL_WARN_IF( !bInit, "xmlsecurity.dialogs", "Error initializing security context!" );
+
+    if ( bInit )
+    {
+        maSignatureManager.getSignatureHelper().SetStartVerifySignatureHdl( LINK( this, DigitalSignaturesDialog, StartVerifySignatureHdl ) );
+    }
+
+    return bInit;
+}
+
+void DigitalSignaturesDialog::SetStorage( const css::uno::Reference < css::embed::XStorage >& rxStore )
+{
+    if (!rxStore.is())
+    {
+        // PDF supports AdES.
+        m_bAdESCompliant = true;
+        m_xAdESCompliantCB->set_active(m_bAdESCompliant);
+        return;
+    }
+
+    maSignatureManager.setStore(rxStore);
+    maSignatureManager.getSignatureHelper().SetStorage( maSignatureManager.getStore(), m_sODFVersion);
+}
+
+void DigitalSignaturesDialog::SetSignatureStream( const css::uno::Reference < css::io::XStream >& rxStream )
+{
+    maSignatureManager.setSignatureStream(rxStream);
+}
+
+bool DigitalSignaturesDialog::canAddRemove()
+{
+    //FIXME: this func needs some cleanup, such as real split between
+    //'canAdd' and 'canRemove' case
+    bool ret = true;
+
+    uno::Reference<container::XNameAccess> xNameAccess = maSignatureManager.getStore();
+    if (xNameAccess.is() && xNameAccess->hasByName("[Content_Types].xml"))
+        // It's always possible to append an OOXML signature.
+        return ret;
+
+    if (!maSignatureManager.getStore().is())
+        // It's always possible to append a PDF signature.
+        return ret;
+
+    OSL_ASSERT(maSignatureManager.getStore().is());
+    bool bDoc1_1 = DocumentSignatureHelper::isODFPre_1_2(m_sODFVersion);
+    SaveODFItem item;
+    bool bSave1_1 = item.isLessODF1_2();
+
+    // see specification
+    //cvs: specs/www/appwide/security/Electronic_Signatures_and_Security.sxw
+    //Paragraph 'Behavior with regard to ODF 1.2'
+    //For both, macro and document
+    if ( (!bSave1_1  && bDoc1_1) || (bSave1_1 && bDoc1_1) )
+    {
+        //#4
+        std::unique_ptr<weld::MessageDialog> xBox(Application::CreateMessageDialog(m_xDialog.get(),
+                                                  VclMessageType::Warning, VclButtonsType::Ok,
+                                                  XsResId(STR_XMLSECDLG_OLD_ODF_FORMAT)));
+        xBox->run();
+        ret = false;
+    }
+
+    //As of OOo 3.2 the document signature includes in macrosignatures.xml. That is
+    //adding a macro signature will break an existing document signature.
+    //The sfx2 will remove the documentsignature when the user adds a macro signature
+    if (maSignatureManager.getSignatureMode() == DocumentSignatureMode::Macros
+        && ret)
+    {
+        if (m_bHasDocumentSignature && !m_bWarningShowSignMacro)
+        {
+            //The warning says that the document signatures will be removed if the user
+            //continues. He can then either press 'OK' or 'NO'
+            //It the user presses 'Add' or 'Remove' several times then, then the warning
+            //is shown every time until the user presses 'OK'. From then on, the warning
+            //is not displayed anymore as long as the signatures dialog is alive.
+            std::unique_ptr<weld::MessageDialog> xBox(Application::CreateMessageDialog(m_xDialog.get(),
+                                                      VclMessageType::Question, VclButtonsType::YesNo,
+                                                      XsResId(STR_XMLSECDLG_QUERY_REMOVEDOCSIGNBEFORESIGN)));
+            if (xBox->run() == RET_NO)
+                ret = false;
+            else
+                m_bWarningShowSignMacro = true;
+
+        }
+    }
+    return ret;
+}
+
+bool DigitalSignaturesDialog::canAdd()
+{
+    return canAddRemove();
+}
+
+bool DigitalSignaturesDialog::canRemove()
+{
+    bool bRet = true;
+
+    if ( maSignatureManager.getSignatureMode() == DocumentSignatureMode::Content )
+    {
+        std::unique_ptr<weld::MessageDialog> xBox(Application::CreateMessageDialog(m_xDialog.get(),
+                                                  VclMessageType::Question, VclButtonsType::YesNo,
+                                                  XsResId(STR_XMLSECDLG_QUERY_REALLYREMOVE)));
+        short nDlgRet = xBox->run();
+        bRet = ( nDlgRet == RET_YES );
+    }
+
+    return (bRet && canAddRemove());
+}
+
+short DigitalSignaturesDialog::run()
+{
+    // Verify Signatures and add certificates to ListBox...
+    mbVerifySignatures = true;
+    ImplGetSignatureInformations(/*bUseTempStream=*/false, /*bCacheLastSignature=*/true);
+    ImplFillSignaturesBox();
+
+    // FIXME: Disable the "Use XAdES compliant signatures" checkbox if it is irrelevant. If it is
+    // enabled, set its initial state based on existing signatures, if any.
+
+    // If it is OOXML, the checkbox is irrelevant.
+
+    // How to find out here whether it is OOXML? I don't want to create a SignatureStreamHelper and
+    // check its nStorageFormat as that seems overly complicated and seems to have weird indirect
+    // consequences, as I noticed when I tried to use DocumentSignatureManager::IsXAdESRelevant()
+    // (which now is in #if 0).
+
+    if (!maSignatureManager.getCurrentSignatureInformations().empty())
+    {
+        // If the document has only SHA-1 signatures we probably want it to stay that way?
+    }
+
+    // Only verify once, content will not change.
+    // But for refreshing signature information, StartVerifySignatureHdl will be called after each add/remove
+    mbVerifySignatures = false;
+
+    return GenericDialogController::run();
+}
+
+IMPL_LINK_NOARG(DigitalSignaturesDialog, SignatureHighlightHdl, weld::TreeView&, void)
+{
+    bool bSel = m_xSignaturesLB->get_selected_index() != -1;
+    m_xViewBtn->set_sensitive( bSel );
+    if ( m_xAddBtn->get_sensitive() ) // not read only
+        m_xRemoveBtn->set_sensitive( bSel );
+}
+
+IMPL_LINK_NOARG(DigitalSignaturesDialog, OKButtonHdl, weld::Button&, void)
+{
+    if (mbSignaturesChanged)
+        maSignatureManager.write(m_bAdESCompliant);
+
+    m_xDialog->response(RET_OK);
+}
+
+IMPL_LINK_NOARG(DigitalSignaturesDialog, SignatureSelectHdl, weld::TreeView&, bool)
+{
+    ImplShowSignaturesDetails();
+    return true;
+}
+
+IMPL_LINK_NOARG(DigitalSignaturesDialog, AdESCompliantCheckBoxHdl, weld::ToggleButton&, void)
+{
+    m_bAdESCompliant = m_xAdESCompliantCB->get_active();
+}
+
+IMPL_LINK_NOARG(DigitalSignaturesDialog, ViewButtonHdl, weld::Button&, void)
+{
+    ImplShowSignaturesDetails();
+}
+
+IMPL_LINK_NOARG(DigitalSignaturesDialog, AddButtonHdl, weld::Button&, void)
+{
+    if( ! canAdd())
+        return;
+    try
+    {
+        std::vector<uno::Reference<xml::crypto::XXMLSecurityContext>> xSecContexts;
+        xSecContexts.push_back(maSignatureManager.getSecurityContext());
+        // Gpg signing is only possible with ODF >= 1.2 documents
+        if (DocumentSignatureHelper::CanSignWithGPG(maSignatureManager.getStore(), m_sODFVersion))
+            xSecContexts.push_back(maSignatureManager.getGpgSecurityContext());
+
+        CertificateChooser aChooser(m_xDialog.get(), xSecContexts, UserAction::Sign);
+        if (aChooser.run() == RET_OK)
+        {
+            sal_Int32 nSecurityId;
+            if (!maSignatureManager.add(aChooser.GetSelectedCertificates()[0], aChooser.GetSelectedSecurityContext(),
+                                        aChooser.GetDescription(), nSecurityId, m_bAdESCompliant))
+                return;
+            mbSignaturesChanged = true;
+
+            xml::crypto::SecurityOperationStatus nStatus = xml::crypto::SecurityOperationStatus_OPERATION_SUCCEEDED;
+
+            if (maSignatureManager.getStore().is())
+                // In the PDF case the signature information is only available after parsing.
+                nStatus = maSignatureManager.getSignatureHelper().GetSignatureInformation( nSecurityId ).nStatus;
+
+            if ( nStatus == css::xml::crypto::SecurityOperationStatus_OPERATION_SUCCEEDED )
+            {
+                mbSignaturesChanged = true;
+
+                // Can't simply remember current information, need parsing for getting full information :(
+                // We need to verify the signatures again, otherwise the status in the signature information
+                // will not contain
+                // SecurityOperationStatus_OPERATION_SUCCEEDED
+                mbVerifySignatures = true;
+                ImplGetSignatureInformations(/*bUseTempStream=*/true, /*bCacheLastSignature=*/false);
+                ImplFillSignaturesBox();
+            }
+        }
+    }
+    catch ( uno::Exception& )
+    {
+        OSL_FAIL( "Exception while adding a signature!" );
+        std::unique_ptr<weld::MessageDialog> xBox(Application::CreateMessageDialog(m_xDialog.get(),
+                                                  VclMessageType::Error, VclButtonsType::Ok,
+                                                  XsResId(STR_XMLSECDLG_SIGNING_FAILED)));
+        xBox->run();
+        // Don't keep invalid entries...
+        ImplGetSignatureInformations(/*bUseTempStream=*/true, /*bCacheLastSignature=*/false);
+        ImplFillSignaturesBox();
+    }
+}
+
+IMPL_LINK_NOARG(DigitalSignaturesDialog, RemoveButtonHdl, weld::Button&, void)
+{
+    if (!canRemove())
+        return;
+    int nEntry = m_xSignaturesLB->get_selected_index();
+    if (nEntry != -1)
+    {
+        try
+        {
+            sal_uInt16 nSelected = m_xSignaturesLB->get_id(nEntry).toUInt32();
+            maSignatureManager.remove(nSelected);
+
+            mbSignaturesChanged = true;
+
+            ImplFillSignaturesBox();
+        }
+        catch ( uno::Exception& )
+        {
+            OSL_FAIL( "Exception while removing a signature!" );
+            // Don't keep invalid entries...
+            ImplGetSignatureInformations(/*bUseTempStream=*/true, /*bCacheLastSignature=*/true);
+            ImplFillSignaturesBox();
+        }
+    }
+}
+
+IMPL_LINK_NOARG(DigitalSignaturesDialog, CertMgrButtonHdl, weld::Button&, void)
+{
+#ifdef _WIN32
+    // FIXME: call GpgME::dirInfo("bindir") somewhere in
+    // SecurityEnvironmentGpg or whatnot
+    // FIXME: perhaps poke GpgME for uiserver, and hope it returns something useful?
+    static const OUStringLiteral aGUIServers[] = { "Gpg4win\\kleopatra.exe",
+                                                   "Gpg4win\\bin\\kleopatra.exe",
+                                                   "GNU\\GnuPG\\kleopatra.exe",
+                                                   "GNU\\GnuPG\\launch-gpa.exe",
+                                                   "GNU\\GnuPG\\gpa.exe",
+                                                   "GnuPG\\bin\\gpa.exe",
+                                                   "GNU\\GnuPG\\bin\\kleopatra.exe",
+                                                   "GNU\\GnuPG\\bin\\launch-gpa.exe",
+                                                   "GNU\\GnuPG\\bin\\gpa.exe",
+                                                 };
+    static const OUString aPath = [] {
+        OUString sRet;
+        PWSTR sPath = nullptr;
+        HRESULT hr
+            = SHGetKnownFolderPath(FOLDERID_ProgramFilesX86, KF_FLAG_DEFAULT, nullptr, &sPath);
+        if (SUCCEEDED(hr))
+        {
+            sRet = o3tl::toU(sPath);
+            CoTaskMemFree(sPath);
+        }
+        return sRet;
+    }();
+    if (aPath.isEmpty())
+        return;
+#else
+    static const OUStringLiteral aGUIServers[] = { "kleopatra", "seahorse", "gpa", "kgpg" };
+    const char* cPath = getenv("PATH");
+    if (!cPath)
+        return;
+    OUString aPath(cPath, strlen(cPath), osl_getThreadTextEncoding());
+#endif
+
+    OUString sFoundGUIServer, sExecutable;
+
+    for ( auto const &rServer : aGUIServers )
+    {
+        osl::FileBase::RC searchError = osl::File::searchFileURL(rServer, aPath, sFoundGUIServer );
+        if (searchError == osl::FileBase::E_None)
+        {
+            osl::File::getSystemPathFromFileURL( sFoundGUIServer, sExecutable );
+            break;
+        }
+
+    }
+
+    if ( !sExecutable.isEmpty() )
+    {
+        uno::Reference< uno::XComponentContext > xContext =
+            ::comphelper::getProcessComponentContext();
+        uno::Reference< css::system::XSystemShellExecute > xSystemShell(
+                 css::system::SystemShellExecute::create(xContext) );
+
+        xSystemShell->execute( sExecutable, OUString(),
+            css::system::SystemShellExecuteFlags::DEFAULTS );
+    }
+    else
+    {
+        std::unique_ptr<weld::MessageDialog> xInfoBox(Application::CreateMessageDialog(m_xDialog.get(),
+                                                      VclMessageType::Info, VclButtonsType::Ok,
+                                                      XsResId(STR_XMLSECDLG_NO_CERT_MANAGER)));
+        xInfoBox->run();
+    }
+}
+
+IMPL_LINK_NOARG(DigitalSignaturesDialog, StartVerifySignatureHdl, LinkParamNone*, bool)
+{
+    return mbVerifySignatures;
+}
+
+void DigitalSignaturesDialog::ImplFillSignaturesBox()
+{
+    m_xSignaturesLB->clear();
+
+    size_t nInfos = maSignatureManager.getCurrentSignatureInformations().size();
+    size_t nValidSigs = 0, nValidCerts = 0;
+    bool bAllNewSignatures = true;
+    bool bSomePartial = false;
+
+    if( nInfos )
+    {
+        for( size_t n = 0; n < nInfos; ++n )
+        {
+            DocumentSignatureAlgorithm mode = DocumentSignatureHelper::getDocumentAlgorithm(
+                m_sODFVersion, maSignatureManager.getCurrentSignatureInformations()[n]);
+            std::vector< OUString > aElementsToBeVerified;
+            if (maSignatureManager.getStore().is())
+                aElementsToBeVerified = DocumentSignatureHelper::CreateElementList(maSignatureManager.getStore(), maSignatureManager.getSignatureMode(), mode);
+
+            const SignatureInformation& rInfo = maSignatureManager.getCurrentSignatureInformations()[n];
+            uno::Reference< css::security::XCertificate > xCert = getCertificate(rInfo);
+
+            OUString aSubject;
+            OUString aIssuer;
+            OUString aDateTimeStr;
+            OUString aDescription;
+            OUString aType;
+
+            bool bCertValid = false;
+            if( xCert.is() )
+            {
+                //check the validity of the cert
+                try {
+                    sal_Int32 certResult = getSecurityEnvironmentForCertificate(xCert)->verifyCertificate(xCert,
+                                                                                                          Sequence<uno::Reference<security::XCertificate> >());
+
+                    bCertValid = certResult == css::security::CertificateValidity::VALID;
+                    if ( bCertValid )
+                        nValidCerts++;
+
+                } catch (css::uno::SecurityException& ) {
+                    OSL_FAIL("Verification of certificate failed");
+                    bCertValid = false;
+                }
+
+                aSubject = xmlsec::GetContentPart( xCert->getSubjectName(), xCert->getCertificateKind() );
+                aIssuer = xmlsec::GetContentPart( xCert->getIssuerName(), xCert->getCertificateKind() );
+            }
+            else if (!rInfo.ouGpgCertificate.isEmpty())
+            {
+                // In case we don't have the gpg key locally, get some data from the document
+                aIssuer = rInfo.ouGpgOwner;
+            }
+
+            aDateTimeStr = utl::GetDateTimeString( rInfo.stDateTime );
+            aDescription = rInfo.ouDescription;
+
+            // Decide type string.
+            if (maSignatureManager.getStore().is())
+            {
+                // OpenPGP
+                if (!rInfo.ouGpgCertificate.isEmpty())
+                    aType = "OpenPGP";
+                // XML based: XAdES or not.
+                else if (!rInfo.ouCertDigest.isEmpty())
+                    aType = "XAdES";
+                else
+                    aType = "XML-DSig";
+            }
+            else
+            {
+                // Assume PDF: PAdES or not.
+                if (rInfo.bHasSigningCertificate)
+                    aType = "PAdES";
+                else
+                    aType = "PDF";
+            }
+
+            bool bSigValid = rInfo.nStatus == css::xml::crypto::SecurityOperationStatus_OPERATION_SUCCEEDED;
+
+            if ( bSigValid )
+            {
+                if (maSignatureManager.getStore().is())
+                {
+                    // ZIP based.
+                    bSigValid = DocumentSignatureHelper::checkIfAllFilesAreSigned(
+                          aElementsToBeVerified, rInfo, mode);
+                }
+                else
+                {
+                    // Assume PDF.
+                    bSigValid = !rInfo.bPartialDocumentSignature;
+                }
+
+                if( bSigValid )
+                    nValidSigs++;
+                else
+                {
+                    bSomePartial = true;
+                }
+            }
+
+            OUString sImage;
+            if (!bSigValid)
+            {
+                sImage = BMP_SIG_INVALID;
+            }
+            else if (!bCertValid)
+            {
+                sImage = BMP_SIG_NOT_VALIDATED;
+            }
+            //Check if the signature is a "old" document signature, that is, which was created
+            //by a version of OOo previous to 3.2
+            // If there is no storage, then it's pointless to check storage
+            // stream references.
+            else if (maSignatureManager.getSignatureMode() == DocumentSignatureMode::Content
+                && (maSignatureManager.getStore().is() && !DocumentSignatureHelper::isOOo3_2_Signature(
+                maSignatureManager.getCurrentSignatureInformations()[n])))
+            {
+                sImage = BMP_SIG_NOT_VALIDATED;
+                bAllNewSignatures = false;
+            }
+            else if (maSignatureManager.getSignatureMode() == DocumentSignatureMode::Content
+                && DocumentSignatureHelper::isOOo3_2_Signature(
+                maSignatureManager.getCurrentSignatureInformations()[n]))
+            {
+                sImage = BMP_SIG_VALID;
+            }
+            else if (maSignatureManager.getSignatureMode() == DocumentSignatureMode::Macros)
+            {
+                sImage = BMP_SIG_VALID;
+            }
+
+            m_xSignaturesLB->insert(nullptr, n, nullptr, nullptr,
+                                    &sImage, nullptr, nullptr, false, nullptr);
+            m_xSignaturesLB->set_text(n, aSubject, 1);
+            m_xSignaturesLB->set_text(n, aIssuer, 2);
+            m_xSignaturesLB->set_text(n, aDateTimeStr, 3);
+            m_xSignaturesLB->set_text(n, aDescription, 4);
+            m_xSignaturesLB->set_text(n, aType, 5);
+            m_xSignaturesLB->set_id(n, OUString::number(n)); // misuse user data as index
+        }
+    }
+
+    bool bAllSigsValid = (nValidSigs == nInfos);
+    bool bAllCertsValid = (nValidCerts == nInfos);
+    bool bShowValidState = nInfos && (bAllSigsValid && bAllCertsValid && bAllNewSignatures);
+
+    m_xSigsValidImg->set_visible( bShowValidState);
+    m_xSigsValidFI->set_visible( bShowValidState );
+
+    bool bShowInvalidState = nInfos && !bAllSigsValid;
+
+    m_xSigsInvalidImg->set_visible( bShowInvalidState && !bSomePartial);
+    m_xSigsInvalidFI->set_visible( bShowInvalidState && !bSomePartial);
+
+    bool bShowNotValidatedState = nInfos && bAllSigsValid && !bAllCertsValid;
+
+    m_xSigsNotvalidatedImg->set_visible(bShowNotValidatedState);
+    m_xSigsNotvalidatedFI->set_visible(bShowNotValidatedState);
+
+    //bAllNewSignatures is always true if we are not in document mode
+    bool bShowOldSignature = nInfos && bAllSigsValid && bAllCertsValid && !bAllNewSignatures;
+    m_xSigsOldSignatureImg->set_visible(bShowOldSignature || bSomePartial);
+    m_xSigsOldSignatureFI->set_visible(bShowOldSignature || bSomePartial);
+
+    SignatureHighlightHdl(*m_xSignaturesLB);
+}
+
+uno::Reference<security::XCertificate> DigitalSignaturesDialog::getCertificate(const SignatureInformation& rInfo)
+{
+    uno::Reference<xml::crypto::XSecurityEnvironment> xSecEnv = maSignatureManager.getSecurityEnvironment();
+    uno::Reference<xml::crypto::XSecurityEnvironment> xGpgSecEnv = maSignatureManager.getGpgSecurityEnvironment();
+    uno::Reference<security::XCertificate> xCert;
+
+    //First we try to get the certificate which is embedded in the XML Signature
+    if (xSecEnv.is() && !rInfo.ouX509Certificate.isEmpty())
+        xCert = xSecEnv->createCertificateFromAscii(rInfo.ouX509Certificate);
+    else {
+        //There must be an embedded certificate because we use it to get the
+        //issuer name. We cannot use /Signature/KeyInfo/X509Data/X509IssuerName
+        //because it could be modified by an attacker. The issuer is displayed
+        //in the digital signature dialog.
+        //Comparing the X509IssuerName with the one from the X509Certificate in order
+        //to find out if the X509IssuerName was modified does not work. See #i62684
+        SAL_WARN( "xmlsecurity.dialogs", "Could not find embedded certificate!");
+    }
+
+    //In case there is no embedded certificate we try to get it from a local store
+    if (!xCert.is() && xSecEnv.is())
+        xCert = xSecEnv->getCertificate( rInfo.ouX509IssuerName, xmlsecurity::numericStringToBigInteger( rInfo.ouX509SerialNumber ) );
+    if (!xCert.is() && xGpgSecEnv.is())
+        xCert = xGpgSecEnv->getCertificate( rInfo.ouGpgKeyID, xmlsecurity::numericStringToBigInteger("") );
+
+    SAL_WARN_IF( !xCert.is(), "xmlsecurity.dialogs", "Certificate not found and can't be created!" );
+
+    return xCert;
+}
+
+uno::Reference<xml::crypto::XSecurityEnvironment> DigitalSignaturesDialog::getSecurityEnvironmentForCertificate(const uno::Reference<security::XCertificate>& xCert)
+{
+    if (xCert->getCertificateKind() == CertificateKind_OPENPGP)
+        return maSignatureManager.getGpgSecurityEnvironment();
+    else if (xCert->getCertificateKind() == CertificateKind_X509)
+        return maSignatureManager.getSecurityEnvironment();
+
+    throw RuntimeException("Unknown certificate kind");
+}
+
+//If bUseTempStream is true then the temporary signature stream is used.
+//Otherwise the real signature stream is used.
+void DigitalSignaturesDialog::ImplGetSignatureInformations(bool bUseTempStream, bool bCacheLastSignature)
+{
+    maSignatureManager.read(bUseTempStream, bCacheLastSignature);
+    mbVerifySignatures = false;
+}
+
+void DigitalSignaturesDialog::ImplShowSignaturesDetails()
+{
+    int nEntry = m_xSignaturesLB->get_selected_index();
+    if (nEntry != -1)
+    {
+        sal_uInt16 nSelected = m_xSignaturesLB->get_id(nEntry).toUInt32();
+        const SignatureInformation& rInfo = maSignatureManager.getCurrentSignatureInformations()[ nSelected ];
+        uno::Reference<security::XCertificate> xCert = getCertificate(rInfo);
+
+        if ( xCert.is() )
+        {
+            uno::Reference<xml::crypto::XSecurityEnvironment> xSecEnv = getSecurityEnvironmentForCertificate(xCert);
+            CertificateViewer aViewer(m_xDialog.get(), xSecEnv, xCert, false, nullptr);
+            aViewer.run();
+        }
+        else
+        {
+            std::unique_ptr<weld::MessageDialog> xInfoBox(Application::CreateMessageDialog(m_xDialog.get(),
+                                                          VclMessageType::Info, VclButtonsType::Ok,
+                                                          XsResId(STR_XMLSECDLG_NO_CERT_FOUND)));
+            xInfoBox->run();
+        }
+    }
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/dialogs/macrosecurity.cxx b/xmlsecurity/source/dialogs/macrosecurity.cxx
new file mode 100644
index 000000000..1596e327d
--- /dev/null
+++ b/xmlsecurity/source/dialogs/macrosecurity.cxx
@@ -0,0 +1,442 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+
+#include <macrosecurity.hxx>
+#include <certificateviewer.hxx>
+#include <biginteger.hxx>
+#include <resourcemanager.hxx>
+#include <strings.hrc>
+
+#include <osl/file.hxx>
+#include <sal/log.hxx>
+
+#include <com/sun/star/xml/crypto/XSecurityEnvironment.hpp>
+#include <comphelper/sequence.hxx>
+#include <comphelper/processfactory.hxx>
+#include <comphelper/xmlsechelper.hxx>
+#include <com/sun/star/uno/Exception.hpp>
+#include <com/sun/star/ui/dialogs/FolderPicker.hpp>
+#include <com/sun/star/ui/dialogs/ExecutableDialogResults.hpp>
+#include <tools/diagnose_ex.h>
+#include <tools/urlobj.hxx>
+#include <unotools/datetime.hxx>
+
+#include <vcl/svapp.hxx>
+
+using namespace comphelper;
+using namespace ::com::sun::star;
+
+
+IMPL_LINK_NOARG(MacroSecurity, OkBtnHdl, weld::Button&, void)
+{
+    m_xLevelTP->ClosePage();
+    m_xTrustSrcTP->ClosePage();
+    m_xDialog->response(RET_OK);
+}
+
+MacroSecurity::MacroSecurity(weld::Window* pParent,
+    const css::uno::Reference<css::xml::crypto::XSecurityEnvironment>& rxSecurityEnvironment)
+    : GenericDialogController(pParent, "xmlsec/ui/macrosecuritydialog.ui", "MacroSecurityDialog")
+    , m_xSecurityEnvironment(rxSecurityEnvironment)
+    , m_xTabCtrl(m_xBuilder->weld_notebook("tabcontrol"))
+    , m_xOkBtn(m_xBuilder->weld_button("ok"))
+    , m_xResetBtn(m_xBuilder->weld_button("reset"))
+{
+    m_xTabCtrl->connect_enter_page(LINK(this, MacroSecurity, ActivatePageHdl));
+
+    m_xLevelTP.reset(new MacroSecurityLevelTP(m_xTabCtrl->get_page("SecurityLevelPage"), this));
+    m_xTrustSrcTP.reset(new MacroSecurityTrustedSourcesTP(m_xTabCtrl->get_page("SecurityTrustPage"), this));
+
+    m_xTabCtrl->set_current_page("SecurityLevelPage");
+    m_xOkBtn->connect_clicked(LINK(this, MacroSecurity, OkBtnHdl));
+}
+
+IMPL_LINK(MacroSecurity, ActivatePageHdl, const OString&, rPage, void)
+{
+    if (rPage == "SecurityLevelPage")
+        m_xLevelTP->ActivatePage();
+    else if (rPage == "SecurityTrustPage")
+        m_xTrustSrcTP->ActivatePage();
+}
+
+MacroSecurityTP::MacroSecurityTP(weld::Container* pParent, const OUString& rUIXMLDescription,
+                                 const OString& rID, MacroSecurity* pDlg)
+    : m_xBuilder(Application::CreateBuilder(pParent, rUIXMLDescription))
+    , m_xContainer(m_xBuilder->weld_container(rID))
+    , m_pDlg(pDlg)
+{
+}
+
+void MacroSecurityTP::ActivatePage()
+{
+}
+
+MacroSecurityTP::~MacroSecurityTP()
+{
+}
+
+MacroSecurityLevelTP::MacroSecurityLevelTP(weld::Container* pParent, MacroSecurity* pDlg)
+    : MacroSecurityTP(pParent, "xmlsec/ui/securitylevelpage.ui", "SecurityLevelPage", pDlg)
+    , m_xVeryHighRB(m_xBuilder->weld_radio_button("vhigh"))
+    , m_xHighRB(m_xBuilder->weld_radio_button("high"))
+    , m_xMediumRB(m_xBuilder->weld_radio_button("med"))
+    , m_xLowRB(m_xBuilder->weld_radio_button("low"))
+    , m_xVHighImg(m_xBuilder->weld_widget("vhighimg"))
+    , m_xHighImg(m_xBuilder->weld_widget("highimg"))
+    , m_xMedImg(m_xBuilder->weld_widget("medimg"))
+    , m_xLowImg(m_xBuilder->weld_widget("lowimg"))
+{
+    m_xLowRB->connect_toggled( LINK( this, MacroSecurityLevelTP, RadioButtonHdl ) );
+    m_xMediumRB->connect_toggled( LINK( this, MacroSecurityLevelTP, RadioButtonHdl ) );
+    m_xHighRB->connect_toggled( LINK( this, MacroSecurityLevelTP, RadioButtonHdl ) );
+    m_xVeryHighRB->connect_toggled( LINK( this, MacroSecurityLevelTP, RadioButtonHdl ) );
+
+    int nPrefWidth(std::max({m_xVeryHighRB->get_preferred_size().Width(),
+                             m_xHighRB->get_preferred_size().Width(),
+                             m_xMediumRB->get_preferred_size().Width(),
+                             m_xLowRB->get_preferred_size().Width()}));
+    int nMaxWidth = m_xLowRB->get_approximate_digit_width() * 60;
+    if (nPrefWidth > nMaxWidth)
+    {
+        m_xLowRB->set_label_line_wrap(true);
+        m_xLowRB->set_size_request(nMaxWidth, -1);
+        m_xMediumRB->set_label_line_wrap(true);
+        m_xMediumRB->set_size_request(nMaxWidth, -1);
+        m_xHighRB->set_label_line_wrap(true);
+        m_xHighRB->set_size_request(nMaxWidth, -1);
+        m_xVeryHighRB->set_label_line_wrap(true);
+        m_xVeryHighRB->set_size_request(nMaxWidth, -1);
+    }
+
+    mnCurLevel = static_cast<sal_uInt16>(m_pDlg->m_aSecOptions.GetMacroSecurityLevel());
+    bool bReadonly = m_pDlg->m_aSecOptions.IsReadOnly( SvtSecurityOptions::EOption::MacroSecLevel );
+
+    weld::RadioButton* pCheck = nullptr;
+    weld::Widget* pImage = nullptr;
+    switch (mnCurLevel)
+    {
+        case 3:
+            pCheck = m_xVeryHighRB.get();
+            pImage = m_xVHighImg.get();
+            break;
+        case 2:
+            pCheck = m_xHighRB.get();
+            pImage = m_xHighImg.get();
+            break;
+        case 1:
+            pCheck = m_xMediumRB.get();
+            pImage = m_xMedImg.get();
+            break;
+        case 0:
+            pCheck = m_xLowRB.get();
+            pImage = m_xLowImg.get();
+            break;
+    }
+    if (pCheck)
+        pCheck->set_active(true);
+    else
+    {
+        OSL_FAIL("illegal macro security level");
+    }
+    if (bReadonly && pImage)
+    {
+        pImage->show();
+        m_xVeryHighRB->set_sensitive(false);
+        m_xHighRB->set_sensitive(false);
+        m_xMediumRB->set_sensitive(false);
+        m_xLowRB->set_sensitive(false);
+    }
+}
+
+IMPL_LINK_NOARG(MacroSecurityLevelTP, RadioButtonHdl, weld::ToggleButton&, void)
+{
+    sal_uInt16 nNewLevel = 0;
+    if( m_xVeryHighRB->get_active() )
+        nNewLevel = 3;
+    else if( m_xHighRB->get_active() )
+        nNewLevel = 2;
+    else if( m_xMediumRB->get_active() )
+        nNewLevel = 1;
+
+    if ( nNewLevel != mnCurLevel )
+    {
+        mnCurLevel = nNewLevel;
+        m_pDlg->EnableReset();
+    }
+}
+
+void MacroSecurityLevelTP::ClosePage()
+{
+    m_pDlg->m_aSecOptions.SetMacroSecurityLevel( mnCurLevel );
+}
+
+void MacroSecurityTrustedSourcesTP::ImplCheckButtons()
+{
+    bool bCertSelected = m_xTrustCertLB->get_selected_index() != -1;
+    m_xViewCertPB->set_sensitive( bCertSelected );
+    m_xRemoveCertPB->set_sensitive( bCertSelected && !mbAuthorsReadonly);
+
+    bool bLocationSelected = m_xTrustFileLocLB->get_selected_index() != -1;
+    m_xRemoveLocPB->set_sensitive( bLocationSelected && !mbURLsReadonly);
+}
+
+void MacroSecurityTrustedSourcesTP::ShowBrokenCertificateError(const OUString& rData)
+{
+    OUString aMsg = XsResId(STR_BROKEN_MACRO_CERTIFICATE_DATA);
+    aMsg = aMsg.replaceFirst("%{data}", rData);
+    std::unique_ptr<weld::MessageDialog> xErrorBox(Application::CreateMessageDialog(m_pDlg->getDialog(),
+        VclMessageType::Error, VclButtonsType::Ok, aMsg));
+    xErrorBox->run();
+}
+
+IMPL_LINK_NOARG(MacroSecurityTrustedSourcesTP, ViewCertPBHdl, weld::Button&, void)
+{
+    int nEntry = m_xTrustCertLB->get_selected_index();
+    if (nEntry != -1)
+    {
+        const sal_uInt16 nSelected = m_xTrustCertLB->get_id(nEntry).toUInt32();
+        uno::Reference< css::security::XCertificate > xCert;
+        try
+        {
+            xCert = m_pDlg->m_xSecurityEnvironment->getCertificate(m_aTrustedAuthors[nSelected][0],
+                            xmlsecurity::numericStringToBigInteger(m_aTrustedAuthors[nSelected][1]));
+        }
+        catch (...)
+        {
+            TOOLS_WARN_EXCEPTION("xmlsecurity.dialogs", "matching certificate not found for: " << m_aTrustedAuthors[nSelected][0]);
+        }
+
+        if (!xCert.is())
+        {
+            try
+            {
+                xCert = m_pDlg->m_xSecurityEnvironment->createCertificateFromAscii(m_aTrustedAuthors[nSelected][2]);
+            }
+            catch (...)
+            {
+                TOOLS_WARN_EXCEPTION("xmlsecurity.dialogs", "certificate data couldn't be parsed: " << m_aTrustedAuthors[nSelected][2]);
+            }
+        }
+
+        if ( xCert.is() )
+        {
+            CertificateViewer aViewer(m_pDlg->getDialog(), m_pDlg->m_xSecurityEnvironment, xCert, false, nullptr);
+            aViewer.run();
+        }
+        else
+            // should never happen, as we parsed the certificate data when we added it!
+            ShowBrokenCertificateError(m_aTrustedAuthors[nSelected][2]);
+    }
+}
+
+IMPL_LINK_NOARG(MacroSecurityTrustedSourcesTP, RemoveCertPBHdl, weld::Button&, void)
+{
+    int nEntry = m_xTrustCertLB->get_selected_index();
+    if (nEntry != -1)
+    {
+        sal_uInt16 nAuthor = m_xTrustCertLB->get_id(nEntry).toUInt32();
+        ::comphelper::removeElementAt( m_aTrustedAuthors, nAuthor );
+
+        FillCertLB();
+        ImplCheckButtons();
+    }
+}
+
+IMPL_LINK_NOARG(MacroSecurityTrustedSourcesTP, AddLocPBHdl, weld::Button&, void)
+{
+    try
+    {
+        uno::Reference < uno::XComponentContext > xContext( ::comphelper::getProcessComponentContext() );
+        uno::Reference < ui::dialogs::XFolderPicker2 > xFolderPicker = ui::dialogs::FolderPicker::create(xContext);
+
+        short nRet = xFolderPicker->execute();
+
+        if( ui::dialogs::ExecutableDialogResults::OK != nRet )
+            return;
+
+        OUString aPathStr = xFolderPicker->getDirectory();
+        INetURLObject aNewObj( aPathStr );
+        aNewObj.removeFinalSlash();
+
+        // then the new path also a URL else system path
+        OUString aSystemFileURL = ( aNewObj.GetProtocol() != INetProtocol::NotValid ) ?
+            aPathStr : aNewObj.getFSysPath( FSysStyle::Detect );
+
+        OUString aNewPathStr(aSystemFileURL);
+
+        if ( osl::FileBase::getSystemPathFromFileURL( aSystemFileURL, aSystemFileURL ) == osl::FileBase::E_None )
+            aNewPathStr = aSystemFileURL;
+
+        if (m_xTrustFileLocLB->find_text(aNewPathStr) == -1)
+            m_xTrustFileLocLB->append_text(aNewPathStr);
+
+        ImplCheckButtons();
+    }
+    catch( uno::Exception& )
+    {
+        TOOLS_WARN_EXCEPTION( "xmlsecurity.dialogs", "MacroSecurityTrustedSourcesTP::AddLocPBHdl(): exception from folder picker" );
+    }
+}
+
+IMPL_LINK_NOARG(MacroSecurityTrustedSourcesTP, RemoveLocPBHdl, weld::Button&, void)
+{
+    sal_Int32 nSel = m_xTrustFileLocLB->get_selected_index();
+    if (nSel != -1)
+    {
+        m_xTrustFileLocLB->remove(nSel);
+        // Trusted Path could not be removed (#i33584#)
+        // after remove an entry, select another one if exists
+        int nNewCount = m_xTrustFileLocLB->n_children();
+        if (nNewCount > 0)
+        {
+            if (nSel >= nNewCount)
+                nSel = nNewCount - 1;
+            m_xTrustFileLocLB->select(nSel);
+        }
+        ImplCheckButtons();
+    }
+}
+
+IMPL_LINK_NOARG(MacroSecurityTrustedSourcesTP, TrustCertLBSelectHdl, weld::TreeView&, void)
+{
+    ImplCheckButtons();
+}
+
+IMPL_LINK_NOARG(MacroSecurityTrustedSourcesTP, TrustFileLocLBSelectHdl, weld::TreeView&, void)
+{
+    ImplCheckButtons();
+}
+
+void MacroSecurityTrustedSourcesTP::FillCertLB(const bool bShowWarnings)
+{
+    m_xTrustCertLB->clear();
+
+    sal_uInt32 nEntries = m_aTrustedAuthors.getLength();
+
+    if ( nEntries && m_pDlg->m_xSecurityEnvironment.is() )
+    {
+        for( sal_uInt32 nEntry = 0 ; nEntry < nEntries ; ++nEntry )
+        {
+            css::uno::Sequence< OUString >&              rEntry = m_aTrustedAuthors[ nEntry ];
+
+            try
+            {
+                // create from RawData
+                uno::Reference< css::security::XCertificate > xCert = m_pDlg->m_xSecurityEnvironment->createCertificateFromAscii(rEntry[2]);
+                m_xTrustCertLB->append(OUString::number(nEntry), xmlsec::GetContentPart(xCert->getSubjectName(), xCert->getCertificateKind()));
+                m_xTrustCertLB->set_text(nEntry, xmlsec::GetContentPart(xCert->getIssuerName(), xCert->getCertificateKind()), 1);
+                m_xTrustCertLB->set_text(nEntry, utl::GetDateTimeString(xCert->getNotValidAfter()), 2);
+            }
+            catch (...)
+            {
+                if (bShowWarnings)
+                {
+                    TOOLS_WARN_EXCEPTION("xmlsecurity.dialogs", "certificate data couldn't be parsed: " << rEntry[2]);
+                    OUString sData = rEntry[2];
+                    css::uno::Any tools_warn_exception(DbgGetCaughtException());
+                    OUString sException = OStringToOUString(exceptionToString(tools_warn_exception), RTL_TEXTENCODING_UTF8);
+                    if (!sException.isEmpty())
+                        sData +=  " / " + sException;
+                    ShowBrokenCertificateError(sData);
+                }
+            }
+        }
+    }
+}
+
+MacroSecurityTrustedSourcesTP::MacroSecurityTrustedSourcesTP(weld::Container* pParent, MacroSecurity* pDlg)
+    : MacroSecurityTP(pParent, "xmlsec/ui/securitytrustpage.ui", "SecurityTrustPage", pDlg)
+    , m_xTrustCertROFI(m_xBuilder->weld_image("lockcertimg"))
+    , m_xTrustCertLB(m_xBuilder->weld_tree_view("certificates"))
+    , m_xViewCertPB(m_xBuilder->weld_button("viewcert"))
+    , m_xRemoveCertPB(m_xBuilder->weld_button("removecert"))
+    , m_xTrustFileROFI(m_xBuilder->weld_image("lockfileimg"))
+    , m_xTrustFileLocLB(m_xBuilder->weld_tree_view("locations"))
+    , m_xAddLocPB(m_xBuilder->weld_button("addfile"))
+    , m_xRemoveLocPB(m_xBuilder->weld_button("removefile"))
+{
+    auto nColWidth = m_xTrustCertLB->get_approximate_digit_width() * 12;
+    std::vector<int> aWidths;
+    aWidths.push_back(nColWidth * 2);
+    aWidths.push_back(nColWidth * 2);
+    m_xTrustCertLB->set_column_fixed_widths(aWidths);
+    m_xTrustCertLB->set_size_request(nColWidth * 5.5, m_xTrustCertLB->get_height_rows(5));
+
+    m_xTrustCertLB->connect_changed( LINK( this, MacroSecurityTrustedSourcesTP, TrustCertLBSelectHdl ) );
+    m_xViewCertPB->connect_clicked( LINK( this, MacroSecurityTrustedSourcesTP, ViewCertPBHdl ) );
+    m_xViewCertPB->set_sensitive(false);
+    m_xRemoveCertPB->connect_clicked( LINK( this, MacroSecurityTrustedSourcesTP, RemoveCertPBHdl ) );
+    m_xRemoveCertPB->set_sensitive(false);
+
+    m_xTrustFileLocLB->connect_changed( LINK( this, MacroSecurityTrustedSourcesTP, TrustFileLocLBSelectHdl ) );
+    m_xTrustFileLocLB->set_size_request(nColWidth * 5, m_xTrustFileLocLB->get_height_rows(5));
+    m_xAddLocPB->connect_clicked( LINK( this, MacroSecurityTrustedSourcesTP, AddLocPBHdl ) );
+    m_xRemoveLocPB->connect_clicked( LINK( this, MacroSecurityTrustedSourcesTP, RemoveLocPBHdl ) );
+    m_xRemoveLocPB->set_sensitive(false);
+
+    m_aTrustedAuthors = m_pDlg->m_aSecOptions.GetTrustedAuthors();
+    mbAuthorsReadonly = m_pDlg->m_aSecOptions.IsReadOnly( SvtSecurityOptions::EOption::MacroTrustedAuthors );
+    m_xTrustCertROFI->set_visible(mbAuthorsReadonly);
+
+    FillCertLB(true);
+
+    const css::uno::Sequence< OUString > aSecureURLs = m_pDlg->m_aSecOptions.GetSecureURLs();
+    mbURLsReadonly = m_pDlg->m_aSecOptions.IsReadOnly( SvtSecurityOptions::EOption::SecureUrls );
+    m_xTrustFileROFI->set_visible(mbURLsReadonly);
+    m_xAddLocPB->set_sensitive(!mbURLsReadonly);
+
+    for (const auto& rSecureURL : aSecureURLs)
+    {
+        OUString aSystemFileURL( rSecureURL );
+        osl::FileBase::getSystemPathFromFileURL( aSystemFileURL, aSystemFileURL );
+        m_xTrustFileLocLB->append_text(aSystemFileURL);
+    }
+}
+
+void MacroSecurityTrustedSourcesTP::ActivatePage()
+{
+    m_pDlg->EnableReset( false );
+    FillCertLB();
+}
+
+void MacroSecurityTrustedSourcesTP::ClosePage()
+{
+    sal_Int32 nEntryCnt = m_xTrustFileLocLB->n_children();
+    if( nEntryCnt )
+    {
+        css::uno::Sequence< OUString > aSecureURLs( nEntryCnt );
+        for (sal_Int32 i = 0; i < nEntryCnt; ++i)
+        {
+            OUString aURL(m_xTrustFileLocLB->get_text(i));
+            osl::FileBase::getFileURLFromSystemPath( aURL, aURL );
+            aSecureURLs[ i ] = aURL;
+        }
+
+        m_pDlg->m_aSecOptions.SetSecureURLs( aSecureURLs );
+    }
+    // Trusted Path could not be removed (#i33584#)
+    // don't forget to remove the old saved SecureURLs
+    else
+        m_pDlg->m_aSecOptions.SetSecureURLs( css::uno::Sequence< OUString >() );
+
+    m_pDlg->m_aSecOptions.SetTrustedAuthors( m_aTrustedAuthors );
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/framework/buffernode.cxx b/xmlsecurity/source/framework/buffernode.cxx
new file mode 100644
index 000000000..0a0a58421
--- /dev/null
+++ b/xmlsecurity/source/framework/buffernode.cxx
@@ -0,0 +1,886 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+
+#include "elementmark.hxx"
+#include "elementcollector.hxx"
+#include "buffernode.hxx"
+#include <com/sun/star/xml/crypto/sax/ConstOfSecurityId.hpp>
+#include <osl/diagnose.h>
+#include <rtl/ustrbuf.hxx>
+
+BufferNode::BufferNode( const css::uno::Reference< css::xml::wrapper::XXMLElementWrapper >& xXMLElement )
+    :m_pParent(nullptr),
+     m_pBlocker(nullptr),
+     m_bAllReceived(false),
+     m_xXMLElement(xXMLElement)
+{
+}
+
+bool BufferNode::isECOfBeforeModifyIncluded(sal_Int32 nIgnoredSecurityId) const
+/****** BufferNode/isECOfBeforeModifyIncluded ********************************
+ *
+ *   NAME
+ *  isECOfBeforeModifyIncluded -- checks whether there is some
+ *  ElementCollector on this BufferNode, that has BEFORE-MODIFY priority.
+ *
+ *   SYNOPSIS
+ *  bExist = isECOfBeforeModifyIncluded(nIgnoredSecurityId);
+ *
+ *   FUNCTION
+ *  checks each ElementCollector on this BufferNode, if all following
+ *  conditions are satisfied, then returns true:
+ *  1. the ElementCollector's priority is BEFOREMODIFY;
+ *  2. the ElementCollector's securityId can't be ignored.
+ *  otherwise, returns false.
+ *
+ *   INPUTS
+ *  nIgnoredSecurityId -    the security Id to be ignored. If it equals
+ *                          to UNDEFINEDSECURITYID, then no security Id
+ *                          will be ignored.
+ *
+ *   RESULT
+ *  bExist - true if a match found, false otherwise
+ ******************************************************************************/
+{
+    return std::any_of(m_vElementCollectors.cbegin(), m_vElementCollectors.cend(),
+        [nIgnoredSecurityId](const ElementCollector* pElementCollector) {
+            return (nIgnoredSecurityId == css::xml::crypto::sax::ConstOfSecurityId::UNDEFINEDSECURITYID ||
+                    pElementCollector->getSecurityId() != nIgnoredSecurityId) &&
+                   (pElementCollector->getPriority() == css::xml::crypto::sax::ElementMarkPriority_BEFOREMODIFY);
+        });
+}
+
+void BufferNode::setReceivedAll()
+/****** BufferNode/setReceiveAll *********************************************
+ *
+ *   NAME
+ *  setReceivedAll -- indicates that the element in this BufferNode has
+ *  been completely buffered.
+ *
+ *   SYNOPSIS
+ *  setReceivedAll();
+ *
+ *   FUNCTION
+ *  sets the all-received flag and launches ElementCollector's notify
+ *  process.
+ *
+ *   INPUTS
+ *  empty
+ *
+ *   RESULT
+ *  empty
+ ******************************************************************************/
+{
+    m_bAllReceived = true;
+    elementCollectorNotify();
+}
+
+
+void BufferNode::addElementCollector(const ElementCollector* pElementCollector)
+/****** BufferNode/addElementCollector ***************************************
+ *
+ *   NAME
+ *  addElementCollector -- adds a new ElementCollector to this BufferNode.
+ *
+ *   SYNOPSIS
+ *  addElementCollector(pElementCollector);
+ *
+ *   FUNCTION
+ *  see NAME
+ *
+ *   INPUTS
+ *  pElementCollector - the ElementCollector to be added
+ *
+ *   RESULT
+ *  empty
+ ******************************************************************************/
+{
+    m_vElementCollectors.push_back( pElementCollector );
+    const_cast<ElementCollector*>(pElementCollector)->setBufferNode(this);
+}
+
+void BufferNode::removeElementCollector(const ElementCollector* pElementCollector)
+/****** BufferNode/removeElementCollector ************************************
+ *
+ *   NAME
+ *  removeElementCollector -- removes an ElementCollector from this
+ *  BufferNode.
+ *
+ *   SYNOPSIS
+ *  removeElementCollector(pElementCollector);
+ *
+ *   FUNCTION
+ *  see NAME
+ *
+ *   INPUTS
+ *  pElementCollector - the ElementCollector to be removed
+ *
+ *   RESULT
+ *  empty
+ ******************************************************************************/
+{
+    auto ii = std::find(m_vElementCollectors.begin(), m_vElementCollectors.end(), pElementCollector);
+    if (ii != m_vElementCollectors.end())
+    {
+        m_vElementCollectors.erase( ii );
+        const_cast<ElementCollector*>(pElementCollector)->setBufferNode(nullptr);
+    }
+}
+
+
+void BufferNode::setBlocker(const ElementMark* pBlocker)
+/****** BufferNode/setBlocker ************************************************
+ *
+ *   NAME
+ *  setBlocker -- adds a blocker to this BufferNode.
+ *
+ *   SYNOPSIS
+ *  setBlocker(pBlocker);
+ *
+ *   FUNCTION
+ *  see NAME
+ *
+ *   INPUTS
+ *  pBlocker - the new blocker to be attached
+ *
+ *   RESULT
+ *  empty
+ *
+ *   NOTES
+ *  Because there is only one blocker permitted for a BufferNode, so the
+ *  old blocker on this BufferNode, if there is one, will be overcasted.
+ ******************************************************************************/
+{
+    OSL_ASSERT(!(m_pBlocker != nullptr && pBlocker != nullptr));
+
+    m_pBlocker = const_cast<ElementMark*>(pBlocker);
+    if (m_pBlocker != nullptr)
+    {
+        m_pBlocker->setBufferNode(this);
+    }
+}
+
+OUString BufferNode::printChildren() const
+/****** BufferNode/printChildren *********************************************
+ *
+ *   NAME
+ *  printChildren -- prints children information into a string.
+ *
+ *   SYNOPSIS
+ *  result = printChildren();
+ *
+ *   FUNCTION
+ *  see NAME
+ *
+ *   INPUTS
+ *  empty
+ *
+ *   RESULT
+ *  result - the information string
+ ******************************************************************************/
+{
+    OUStringBuffer rc;
+
+    for( const ElementCollector* ii : m_vElementCollectors )
+    {
+        rc.append("BufID=").append(OUString::number(ii->getBufferId()));
+
+        if (ii->getModify())
+        {
+            rc.append("[M]");
+        }
+
+        rc.append(",Pri=");
+
+        switch (ii->getPriority())
+        {
+            case css::xml::crypto::sax::ElementMarkPriority_BEFOREMODIFY:
+                rc.append("BEFOREMODIFY");
+                break;
+            case css::xml::crypto::sax::ElementMarkPriority_AFTERMODIFY:
+                rc.append("AFTERMODIFY");
+                break;
+            default:
+                rc.append("UNKNOWN");
+                break;
+        }
+
+        rc.append("(SecID=").append(OUString::number(ii->getSecurityId())).append(") ");
+    }
+
+    return rc.makeStringAndClear();
+}
+
+bool BufferNode::hasAnything() const
+/****** BufferNode/hasAnything ***********************************************
+ *
+ *   NAME
+ *  hasAnything -- checks whether there is any ElementCollector or blocker
+ *  on this BufferNode.
+ *
+ *   SYNOPSIS
+ *  bExist = hasAnything();
+ *
+ *   FUNCTION
+ *  see NAME
+ *
+ *   INPUTS
+ *  empty
+ *
+ *   RESULT
+ *  bExist - true if there is, false otherwise.
+ ******************************************************************************/
+{
+    return (m_pBlocker || !m_vElementCollectors.empty());
+}
+
+bool BufferNode::hasChildren() const
+/****** BufferNode/hasChildren ***********************************************
+ *
+ *   NAME
+ *  hasChildren -- checks whether this BufferNode has any child
+ *  BufferNode.
+ *
+ *   SYNOPSIS
+ *  bExist = hasChildren();
+ *
+ *   FUNCTION
+ *  see NAME
+ *
+ *   INPUTS
+ *  empty
+ *
+ *   RESULT
+ *  bExist - true if there is, false otherwise.
+ ******************************************************************************/
+{
+    return (!m_vChildren.empty());
+}
+
+std::vector< std::unique_ptr<BufferNode> > const & BufferNode::getChildren() const
+{
+    return m_vChildren;
+}
+
+std::vector< std::unique_ptr<BufferNode> > BufferNode::releaseChildren()
+{
+    return std::move(m_vChildren);
+}
+
+const BufferNode* BufferNode::getFirstChild() const
+/****** BufferNode/getFirstChild *********************************************
+ *
+ *   NAME
+ *  getFirstChild -- retrieves the first child BufferNode.
+ *
+ *   SYNOPSIS
+ *  child = getFirstChild();
+ *
+ *   FUNCTION
+ *  see NAME
+ *
+ *   INPUTS
+ *  empty
+ *
+ *   RESULT
+ *  child - the first child BufferNode, or NULL if there is no child
+ *          BufferNode.
+ ******************************************************************************/
+{
+    BufferNode* rc = nullptr;
+
+    if (!m_vChildren.empty())
+    {
+        rc = m_vChildren.front().get();
+    }
+
+    return rc;
+}
+
+void BufferNode::addChild(std::unique_ptr<BufferNode> pChild, sal_Int32 nPosition)
+/****** BufferNode/addChild(pChild,nPosition) ********************************
+ *
+ *   NAME
+ *  addChild -- inserts a child BufferNode at specific position.
+ *
+ *   SYNOPSIS
+ *  addChild(pChild, nPosition);
+ *
+ *   FUNCTION
+ *  see NAME
+ *
+ *   INPUTS
+ *  pChild -    the child BufferNode to be added.
+ *  nPosition - the position where the new child locates.
+ *
+ *   RESULT
+ *  empty
+ *
+ *   NOTES
+ *  If the nPosition is -1, then the new child BufferNode is appended
+ *  at the end.
+ ******************************************************************************/
+{
+    if (nPosition == -1)
+    {
+        m_vChildren.push_back( std::move(pChild) );
+    }
+    else
+    {
+        m_vChildren.insert(m_vChildren.begin() + nPosition, std::move(pChild));
+    }
+}
+
+void BufferNode::addChild(std::unique_ptr<BufferNode> pChild)
+/****** BufferNode/addChild() ************************************************
+ *
+ *   NAME
+ *  addChild -- add a new child BufferNode.
+ *
+ *   SYNOPSIS
+ *  addChild(pChild);
+ *
+ *   FUNCTION
+ *  see NAME
+ *
+ *   INPUTS
+ *  pChild -    the child BufferNode to be added.
+ *
+ *   RESULT
+ *  empty
+ *
+ *   NOTES
+ *  The new child BufferNode is appended at the end.
+ ******************************************************************************/
+{
+    addChild(std::move(pChild), -1);
+}
+
+void BufferNode::removeChild(const BufferNode* pChild)
+/****** BufferNode/removeChild ***********************************************
+ *
+ *   NAME
+ *  removeChild -- removes and deletes a child BufferNode from the children list.
+ *
+ *   SYNOPSIS
+ *  removeChild(pChild);
+ *
+ *   FUNCTION
+ *  see NAME
+ *
+ *   INPUTS
+ *  pChild - the child BufferNode to be removed
+ *
+ *   RESULT
+ *  empty
+ ******************************************************************************/
+{
+    auto ii = std::find_if(m_vChildren.begin(), m_vChildren.end(),
+                [pChild] (const std::unique_ptr<BufferNode>& i)
+                { return i.get() == pChild; });
+    if (ii != m_vChildren.end())
+        m_vChildren.erase( ii );
+}
+
+sal_Int32 BufferNode::indexOfChild(const BufferNode* pChild) const
+/****** BufferNode/indexOfChild **********************************************
+ *
+ *   NAME
+ *  indexOfChild -- gets the index of a child BufferNode.
+ *
+ *   SYNOPSIS
+ *  index = indexOfChild(pChild);
+ *
+ *   FUNCTION
+ *  see NAME
+ *
+ *   INPUTS
+ *  pChild - the child BufferNode whose index to be gotten
+ *
+ *   RESULT
+ *  index - the index of that child BufferNode. If that child BufferNode
+ *          is not found, -1 is returned.
+ ******************************************************************************/
+{
+    auto ii = std::find_if(m_vChildren.begin(), m_vChildren.end(),
+            [pChild] (const std::unique_ptr<BufferNode>& i)
+            { return i.get() == pChild; });
+    if (ii == m_vChildren.end())
+        return -1;
+
+    return std::distance(m_vChildren.begin(), ii);
+}
+
+
+void BufferNode::setParent(const BufferNode* pParent)
+{
+    m_pParent = const_cast<BufferNode*>(pParent);
+}
+
+const BufferNode* BufferNode::getNextSibling() const
+/****** BufferNode/getNextSibling ********************************************
+ *
+ *   NAME
+ *  getNextSibling -- retrieves the next sibling BufferNode.
+ *
+ *   SYNOPSIS
+ *  sibling = getNextSibling();
+ *
+ *   FUNCTION
+ *  see NAME
+ *
+ *   INPUTS
+ *  empty
+ *
+ *   RESULT
+ *  sibling - the next sibling BufferNode, or NULL if there is none.
+ ******************************************************************************/
+{
+    BufferNode* rc = nullptr;
+
+    if (m_pParent != nullptr)
+    {
+        rc = const_cast<BufferNode*>(m_pParent->getNextChild(this));
+    }
+
+    return rc;
+}
+
+const BufferNode* BufferNode::isAncestor(const BufferNode* pDescendant) const
+/****** BufferNode/isAncestor ************************************************
+ *
+ *   NAME
+ *  isAncestor -- checks whether this BufferNode is an ancestor of another
+ *  BufferNode.
+ *
+ *   SYNOPSIS
+ *  bIs = isAncestor(pDescendant);
+ *
+ *   FUNCTION
+ *  see NAME
+ *
+ *   INPUTS
+ *  pDescendant -   the BufferNode to be checked as a descendant
+ *
+ *   RESULT
+ *  bIs -   true if this BufferNode is an ancestor of the pDescendant,
+ *          false otherwise.
+ ******************************************************************************/
+{
+    BufferNode* rc = nullptr;
+
+    if (pDescendant != nullptr)
+    {
+        auto ii = std::find_if(m_vChildren.cbegin(), m_vChildren.cend(),
+            [&pDescendant](const std::unique_ptr<BufferNode>& pChild) {
+                return (pChild.get() == pDescendant) || (pChild->isAncestor(pDescendant) != nullptr);
+            });
+
+        if (ii != m_vChildren.end())
+            rc = ii->get();
+    }
+
+    return rc;
+}
+
+bool BufferNode::isPrevious(const BufferNode* pFollowing) const
+/****** BufferNode/isPrevious ************************************************
+ *
+ *   NAME
+ *  isPrevious -- checks whether this BufferNode is ahead of another
+ *  BufferNode in the tree order.
+ *
+ *   SYNOPSIS
+ *  bIs = isPrevious(pFollowing);
+ *
+ *   FUNCTION
+ *  see NAME
+ *
+ *   INPUTS
+ *  pFollowing -    the BufferNode to be checked as a following
+ *
+ *   RESULT
+ *  bIs -   true if this BufferNode is ahead in the tree order, false
+ *          otherwise.
+ ******************************************************************************/
+{
+    bool rc = false;
+
+    BufferNode* pNextBufferNode = const_cast<BufferNode*>(getNextNodeByTreeOrder());
+    while (pNextBufferNode != nullptr)
+    {
+        if (pNextBufferNode == pFollowing)
+        {
+            rc = true;
+            break;
+        }
+
+        pNextBufferNode = const_cast<BufferNode*>(pNextBufferNode->getNextNodeByTreeOrder());
+    }
+
+    return rc;
+}
+
+const BufferNode* BufferNode::getNextNodeByTreeOrder() const
+/****** BufferNode/getNextNodeByTreeOrder ************************************
+ *
+ *   NAME
+ *  getNextNodeByTreeOrder -- retrieves the next BufferNode in the tree
+ *  order.
+ *
+ *   SYNOPSIS
+ *  next = getNextNodeByTreeOrder();
+ *
+ *   FUNCTION
+ *  see NAME
+ *
+ *   INPUTS
+ *  empty
+ *
+ *   RESULT
+ *  next -  the BufferNode following this BufferNode in the tree order,
+ *          or NULL if there is none.
+ *
+ *   NOTES
+ *  The "next" node in tree order is defined as:
+ *  1. If a node has children, then the first child is;
+ *  2. otherwise, if it has a following sibling, then this sibling node is;
+ *  3. otherwise, if it has a parent node, the parent's next sibling
+ *     node is;
+ *  4. otherwise, no "next" node exists.
+ ******************************************************************************/
+{
+    /*
+     * If this buffer node has m_vChildren, then return the first
+     * child.
+     */
+    if (hasChildren())
+    {
+        return getFirstChild();
+    }
+
+    /*
+     * Otherwise, it this buffer node has a following sibling,
+     * then return that sibling.
+     */
+    BufferNode* pNextSibling = const_cast<BufferNode*>(getNextSibling());
+    if (pNextSibling != nullptr)
+    {
+        return pNextSibling;
+    }
+
+    /*
+     * Otherwise, it this buffer node has parent, then return
+     * its parent's following sibling.
+     */
+    BufferNode* pNode = const_cast<BufferNode*>(this);
+    BufferNode* pParent;
+    BufferNode* pNextSiblingParent = nullptr;
+
+    do
+    {
+        if (pNode == nullptr)
+        {
+            break;
+        }
+
+        pParent = const_cast<BufferNode*>(pNode->getParent());
+        if (pParent != nullptr)
+        {
+            pNextSiblingParent = const_cast<BufferNode*>(pParent->getNextSibling());
+        }
+        pNode = pParent;
+
+    } while (pNextSiblingParent == nullptr);
+
+    return pNextSiblingParent;
+}
+
+
+void BufferNode::setXMLElement( const css::uno::Reference< css::xml::wrapper::XXMLElementWrapper >& xXMLElement )
+{
+    m_xXMLElement = xXMLElement;
+}
+
+void BufferNode::notifyBranch()
+/****** BufferNode/notifyBranch **********************************************
+ *
+ *   NAME
+ *  notifyBranch -- notifies each BufferNode in the branch of this
+ *  BufferNode in the tree order.
+ *
+ *   SYNOPSIS
+ *  notifyBranch();
+ *
+ *   FUNCTION
+ *  see NAME
+ *
+ *   INPUTS
+ *  empty
+ *
+ *   RESULT
+ *  empty
+ ******************************************************************************/
+{
+    for( std::unique_ptr<BufferNode>& pBufferNode : m_vChildren )
+    {
+        pBufferNode->elementCollectorNotify();
+        pBufferNode->notifyBranch();
+    }
+}
+
+void BufferNode::elementCollectorNotify()
+/****** BufferNode/elementCollectorNotify ************************************
+ *
+ *   NAME
+ *  elementCollectorNotify -- notifies this BufferNode.
+ *
+ *   SYNOPSIS
+ *  elementCollectorNotify();
+ *
+ *   FUNCTION
+ *  Notifies this BufferNode if the notification is not suppressed.
+ *
+ *   INPUTS
+ *  empty
+ *
+ *   RESULT
+ *  child - the first child BufferNode, or NULL if there is no child
+ *          BufferNode.
+ ******************************************************************************/
+{
+    if (!m_vElementCollectors.empty())
+    {
+        css::xml::crypto::sax::ElementMarkPriority nMaxPriority = css::xml::crypto::sax::ElementMarkPriority_MINIMUM;
+        css::xml::crypto::sax::ElementMarkPriority nPriority;
+
+        /*
+         * get the max priority among ElementCollectors on this BufferNode
+         */
+        for( const ElementCollector* pElementCollector : m_vElementCollectors )
+        {
+            nPriority = pElementCollector->getPriority();
+            if (nPriority > nMaxPriority)
+            {
+                nMaxPriority = nPriority;
+            }
+        }
+
+        std::vector< const ElementCollector* > vElementCollectors( m_vElementCollectors );
+
+        for( const ElementCollector* ii : vElementCollectors )
+        {
+            ElementCollector* pElementCollector = const_cast<ElementCollector*>(ii);
+            nPriority = pElementCollector->getPriority();
+            bool bToModify = pElementCollector->getModify();
+
+            /*
+             * Only ElementCollector with the max priority can
+             * perform notify operation.
+             * Moreover, if any blocker exists in the subtree of
+             * this BufferNode, this ElementCollector can't do notify
+             * unless its priority is BEFOREMODIFY.
+             */
+            if (nPriority == nMaxPriority &&
+                (nPriority == css::xml::crypto::sax::ElementMarkPriority_BEFOREMODIFY ||
+                 !isBlockerInSubTreeIncluded(pElementCollector->getSecurityId())))
+            {
+                /*
+                 * If this ElementCollector will modify the buffered element, then
+                 * special attention must be paid.
+                 *
+                 * If there is any ElementCollector in the subtree or any ancestor
+                 * ElementCollector with PRI_BEFPREMODIFY priority, this
+                 * ElementCollector can't perform notify operation, otherwise, it
+                 * will destroy the buffered element, in turn, ElementCollectors
+                 * mentioned above can't perform their mission.
+                 */
+                //if (!(nMaxPriority == css::xml::crypto::sax::ElementMarkPriority_PRI_MODIFY &&
+                if (!(bToModify &&
+                     (isECInSubTreeIncluded(pElementCollector->getSecurityId()) ||
+                      isECOfBeforeModifyInAncestorIncluded(pElementCollector->getSecurityId()))
+                   ))
+                {
+                    pElementCollector->notifyListener();
+                }
+            }
+        }
+    }
+}
+
+bool BufferNode::isECInSubTreeIncluded(sal_Int32 nIgnoredSecurityId) const
+/****** BufferNode/isECInSubTreeIncluded *************************************
+ *
+ *   NAME
+ *  isECInSubTreeIncluded -- checks whether there is any ElementCollector
+ *  in the branch of this BufferNode.
+ *
+ *   SYNOPSIS
+ *  bExist = isECInSubTreeIncluded(nIgnoredSecurityId);
+ *
+ *   FUNCTION
+ *  checks each BufferNode in the branch of this BufferNode, if there is
+ *  an ElementCollector whose signatureId is not ignored, then return
+ *  true, otherwise, false returned.
+ *
+ *   INPUTS
+ *  nIgnoredSecurityId -    the security Id to be ignored. If it equals
+ *                          to UNDEFINEDSECURITYID, then no security Id
+ *                          will be ignored.
+ *
+ *   RESULT
+ *  bExist - true if a match found, false otherwise.
+ ******************************************************************************/
+{
+    bool rc = std::any_of(m_vElementCollectors.begin(), m_vElementCollectors.end(),
+        [nIgnoredSecurityId](const ElementCollector* pElementCollector) {
+            return nIgnoredSecurityId == css::xml::crypto::sax::ConstOfSecurityId::UNDEFINEDSECURITYID ||
+                pElementCollector->getSecurityId() != nIgnoredSecurityId;
+    });
+
+    if ( !rc )
+    {
+        rc = std::any_of(m_vChildren.begin(), m_vChildren.end(),
+            [nIgnoredSecurityId](const std::unique_ptr<BufferNode>& pBufferNode) {
+                return pBufferNode->isECInSubTreeIncluded(nIgnoredSecurityId);
+        });
+    }
+
+    return rc;
+}
+
+bool BufferNode::isECOfBeforeModifyInAncestorIncluded(sal_Int32 nIgnoredSecurityId) const
+/****** BufferNode/isECOfBeforeModifyInAncestorIncluded **********************
+ *
+ *   NAME
+ *  isECOfBeforeModifyInAncestorIncluded -- checks whether there is some
+ *  ancestor BufferNode which has ElementCollector with PRI_BEFPREMODIFY
+ *  priority.
+ *
+ *   SYNOPSIS
+ *  bExist = isECOfBeforeModifyInAncestorIncluded(nIgnoredSecurityId);
+ *
+ *   FUNCTION
+ *  checks each ancestor BufferNode through the parent link, if there is
+ *  an ElementCollector with PRI_BEFPREMODIFY priority and its
+ *  signatureId is not ignored, then return true, otherwise, false
+ *  returned.
+ *
+ *   INPUTS
+ *  nIgnoredSecurityId -    the security Id to be ignored. If it equals
+ *                          to UNDEFINEDSECURITYID, then no security Id
+ *                          will be ignored.
+ *
+ *   RESULT
+ *  bExist - true if a match found, false otherwise.
+ ******************************************************************************/
+{
+    bool rc = false;
+
+    BufferNode* pParentNode = m_pParent;
+    while (pParentNode != nullptr)
+    {
+        if (pParentNode->isECOfBeforeModifyIncluded(nIgnoredSecurityId))
+        {
+            rc = true;
+            break;
+        }
+
+        pParentNode = const_cast<BufferNode*>(pParentNode->getParent());
+    }
+
+    return rc;
+}
+
+bool BufferNode::isBlockerInSubTreeIncluded(sal_Int32 nIgnoredSecurityId) const
+/****** BufferNode/isBlockerInSubTreeIncluded ********************************
+ *
+ *   NAME
+ *  isBlockerInSubTreeIncluded -- checks whether there is some BufferNode
+ *  which has blocker on it
+ *
+ *   SYNOPSIS
+ *  bExist = isBlockerInSubTreeIncluded(nIgnoredSecurityId);
+ *
+ *   FUNCTION
+ *  checks each BufferNode in the branch of this BufferNode, if one has
+ *  a blocker on it, and the blocker's securityId is not ignored, then
+ *  returns true; otherwise, false returns.
+ *
+ *   INPUTS
+ *  nIgnoredSecurityId -    the security Id to be ignored. If it equals
+ *                          to UNDEFINEDSECURITYID, then no security Id
+ *                          will be ignored.
+ *
+ *   RESULT
+ *  bExist - true if a match found, false otherwise.
+ ******************************************************************************/
+{
+    return std::any_of(m_vChildren.begin(), m_vChildren.end(),
+        [nIgnoredSecurityId](const std::unique_ptr<BufferNode>& pBufferNode) {
+            ElementMark* pBlocker = pBufferNode->getBlocker();
+            return (pBlocker != nullptr &&
+                (nIgnoredSecurityId == css::xml::crypto::sax::ConstOfSecurityId::UNDEFINEDSECURITYID ||
+                 pBlocker->getSecurityId() != nIgnoredSecurityId )) ||
+                pBufferNode->isBlockerInSubTreeIncluded(nIgnoredSecurityId);
+    });
+}
+
+const BufferNode* BufferNode::getNextChild(const BufferNode* pChild) const
+/****** BufferNode/getNextChild **********************************************
+ *
+ *   NAME
+ *  getNextChild -- get the next child BufferNode.
+ *
+ *   SYNOPSIS
+ *  nextChild = getNextChild();
+ *
+ *   FUNCTION
+ *  see NAME
+ *
+ *   INPUTS
+ *  pChild - the child BufferNode whose next node is retrieved.
+ *
+ *   RESULT
+ *  nextChild - the next child BufferNode after the pChild, or NULL if
+ *  there is none.
+ ******************************************************************************/
+{
+    BufferNode* rc = nullptr;
+    bool bChildFound = false;
+
+    for( std::unique_ptr<BufferNode> const & i : m_vChildren )
+    {
+        if (bChildFound)
+        {
+            rc = i.get();
+            break;
+        }
+
+        if( i.get() == pChild )
+        {
+            bChildFound = true;
+        }
+    }
+
+    return rc;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/framework/buffernode.hxx b/xmlsecurity/source/framework/buffernode.hxx
new file mode 100644
index 000000000..e3cabd97e
--- /dev/null
+++ b/xmlsecurity/source/framework/buffernode.hxx
@@ -0,0 +1,116 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#ifndef INCLUDED_XMLSECURITY_SOURCE_FRAMEWORK_BUFFERNODE_HXX
+#define INCLUDED_XMLSECURITY_SOURCE_FRAMEWORK_BUFFERNODE_HXX
+
+#include <com/sun/star/uno/Reference.hxx>
+
+#include <memory>
+#include <vector>
+
+namespace com::sun::star::xml::wrapper { class XXMLElementWrapper; }
+
+class ElementMark;
+class ElementCollector;
+
+class BufferNode final
+/****** buffernode.hxx/CLASS BufferNode ***************************************
+ *
+ *   NAME
+ *  BufferNode -- Class to maintain the tree of buffered elements
+ *
+ *   FUNCTION
+ *  One BufferNode object represents a buffered element in the document
+ *  wrapper component.
+ *  All BufferNode objects construct a tree which has the same structure
+ *  of all buffered elements. That is to say, if one buffered element is
+ *  an ancestor of another buffered element, then the corresponding
+ *  BufferNode objects are also in ancestor/descendant relationship.
+ *  This class is used to manipulate the tree of buffered elements.
+ ******************************************************************************/
+{
+private:
+    /* the parent BufferNode */
+    BufferNode* m_pParent;
+
+    /* all child BufferNodes */
+    std::vector< std::unique_ptr<BufferNode> > m_vChildren;
+
+    /* all ElementCollector holding this BufferNode */
+    std::vector< const ElementCollector* > m_vElementCollectors;
+
+    /*
+     * the blocker holding this BufferNode, one BufferNode can have one
+     * blocker at most
+     */
+    ElementMark* m_pBlocker;
+
+    /*
+     * whether the element has completely buffered by the document wrapper
+     * component
+     */
+    bool m_bAllReceived;
+
+    /* the XMLElementWrapper of the buffered element */
+    css::uno::Reference< css::xml::wrapper::XXMLElementWrapper > m_xXMLElement;
+
+private:
+    bool isECInSubTreeIncluded(sal_Int32 nIgnoredSecurityId) const;
+    bool isECOfBeforeModifyInAncestorIncluded(sal_Int32 nIgnoredSecurityId) const;
+    bool isBlockerInSubTreeIncluded(sal_Int32 nIgnoredSecurityId) const;
+    const BufferNode* getNextChild(const BufferNode* pChild) const;
+
+public:
+    explicit BufferNode(
+        const css::uno::Reference< css::xml::wrapper::XXMLElementWrapper >& xXMLElement);
+
+    bool isECOfBeforeModifyIncluded(sal_Int32 nIgnoredSecurityId) const;
+        void setReceivedAll();
+        bool isAllReceived() const { return m_bAllReceived;}
+    void addElementCollector(const ElementCollector* pElementCollector);
+    void removeElementCollector(const ElementCollector* pElementCollector);
+    ElementMark* getBlocker() const { return m_pBlocker;}
+    void setBlocker(const ElementMark* pBlocker);
+    OUString printChildren() const;
+    bool hasAnything() const;
+    bool hasChildren() const;
+    std::vector< std::unique_ptr< BufferNode> > const & getChildren() const;
+    std::vector< std::unique_ptr< BufferNode> > releaseChildren();
+    const BufferNode* getFirstChild() const;
+    void addChild(std::unique_ptr<BufferNode> pChild, sal_Int32 nPosition);
+    void addChild(std::unique_ptr<BufferNode> pChild);
+    void removeChild(const BufferNode* pChild);
+    sal_Int32 indexOfChild(const BufferNode* pChild) const;
+    const BufferNode* getParent() const { return m_pParent;}
+    void setParent(const BufferNode* pParent);
+    const BufferNode* getNextSibling() const;
+    const BufferNode* isAncestor(const BufferNode* pDescendant) const;
+    bool isPrevious(const BufferNode* pFollowing) const;
+    const BufferNode* getNextNodeByTreeOrder() const;
+    const css::uno::Reference< css::xml::wrapper::XXMLElementWrapper >& getXMLElement() const { return m_xXMLElement;}
+    void setXMLElement(const css::uno::Reference<
+        css::xml::wrapper::XXMLElementWrapper >& xXMLElement);
+    void notifyBranch();
+    void elementCollectorNotify();
+};
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/framework/elementcollector.cxx b/xmlsecurity/source/framework/elementcollector.cxx
new file mode 100644
index 000000000..7801d6328
--- /dev/null
+++ b/xmlsecurity/source/framework/elementcollector.cxx
@@ -0,0 +1,137 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+
+#include "elementmark.hxx"
+#include "elementcollector.hxx"
+#include <com/sun/star/xml/crypto/sax/ConstOfSecurityId.hpp>
+#include <com/sun/star/xml/crypto/sax/XReferenceResolvedListener.hpp>
+
+ElementCollector::ElementCollector(
+    sal_Int32 nBufferId,
+    css::xml::crypto::sax::ElementMarkPriority nPriority,
+    bool bToModify,
+    const css::uno::Reference< css::xml::crypto::sax::XReferenceResolvedListener >& xReferenceResolvedListener)
+    :ElementMark(css::xml::crypto::sax::ConstOfSecurityId::UNDEFINEDSECURITYID, nBufferId),
+     m_nPriority(nPriority),
+     m_bToModify(bToModify),
+     m_bAbleToNotify(false),
+     m_bNotified(false),
+     m_xReferenceResolvedListener(xReferenceResolvedListener)
+/****** ElementCollector/ElementCollector *************************************
+ *
+ *   NAME
+ *  ElementCollector -- constructor method
+ *
+ *   SYNOPSIS
+ *  ElementCollector(nSecurityId, nBufferId, nPriority, bToModify
+ *                   xReferenceResolvedListener);
+ *
+ *   FUNCTION
+ *  construct an ElementCollector object.
+ *
+ *   INPUTS
+ *  nSecurityId -   represents which security entity the buffer node is
+ *          related with. Either a signature or an encryption is
+ *          a security entity.
+ *  nBufferId - the id of the element buffered in the document
+ *          wrapper component. The document wrapper component
+ *          uses this id to search the particular buffered
+ *          element.
+ *  nPriority - the priority value. ElementCollector with lower
+ *          priority value can't notify until all ElementCollectors
+ *          with higher priority value have notified.
+ *  bToModify - A flag representing whether this ElementCollector
+ *          notification will cause the modification of its working
+ *                  element.
+ *  xReferenceResolvedListener
+ *            - the listener that this ElementCollector notifies to.
+ ******************************************************************************/
+{
+    m_type = css::xml::crypto::sax::ElementMarkType_ELEMENTCOLLECTOR;
+}
+
+
+void ElementCollector::notifyListener()
+/****** ElementCollector/notifyListener ***************************************
+ *
+ *   NAME
+ *  notifyListener -- enable the ability to notify the listener
+ *
+ *   SYNOPSIS
+ *  notifyListener();
+ *
+ *   FUNCTION
+ *  enable the ability to notify the listener and try to notify then.
+ ******************************************************************************/
+{
+    m_bAbleToNotify = true;
+    doNotify();
+}
+
+void ElementCollector::setReferenceResolvedListener(
+    const css::uno::Reference< css::xml::crypto::sax::XReferenceResolvedListener >& xReferenceResolvedListener)
+/****** ElementCollector/setReferenceResolvedListener *************************
+ *
+ *   NAME
+ *  setReferenceResolvedListener -- configures a listener for the buffer
+ *  node in this object
+ *
+ *   SYNOPSIS
+ *  setReferenceResolvedListener(xReferenceResolvedListener);
+ *
+ *   FUNCTION
+ *  configures a new listener and try to notify then.
+ *
+ *   INPUTS
+ *  xReferenceResolvedListener - the new listener
+ ******************************************************************************/
+{
+    m_xReferenceResolvedListener = xReferenceResolvedListener;
+    doNotify();
+}
+
+void ElementCollector::doNotify()
+/****** ElementCollector/doNotify *********************************************
+ *
+ *   NAME
+ *  doNotify -- tries to notify the listener
+ *
+ *   SYNOPSIS
+ *  doNotify();
+ *
+ *   FUNCTION
+ *  notifies the listener when all below conditions are satisfied:
+ *  the listener has not been notified;
+ *  the notify right is granted;
+ *  the listener has already been configured;
+ *  the security id has already been configure
+ ******************************************************************************/
+{
+    if (!m_bNotified &&
+        m_bAbleToNotify &&
+        m_xReferenceResolvedListener.is() &&
+        m_nSecurityId != css::xml::crypto::sax::ConstOfSecurityId::UNDEFINEDSECURITYID)
+    {
+        m_bNotified = true;
+        m_xReferenceResolvedListener->referenceResolved(m_nBufferId);
+    }
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/framework/elementcollector.hxx b/xmlsecurity/source/framework/elementcollector.hxx
new file mode 100644
index 000000000..8af12f246
--- /dev/null
+++ b/xmlsecurity/source/framework/elementcollector.hxx
@@ -0,0 +1,83 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#ifndef INCLUDED_XMLSECURITY_SOURCE_FRAMEWORK_ELEMENTCOLLECTOR_HXX
+#define INCLUDED_XMLSECURITY_SOURCE_FRAMEWORK_ELEMENTCOLLECTOR_HXX
+
+#include "elementmark.hxx"
+#include <com/sun/star/xml/crypto/sax/ElementMarkPriority.hpp>
+#include <com/sun/star/uno/Reference.hxx>
+
+namespace com::sun::star::xml::crypto::sax { class XReferenceResolvedListener; }
+
+class ElementCollector : public ElementMark
+/****** elementcollector.hxx/CLASS ElementCollector ***************************
+ *
+ *   NAME
+ *  ElementCollector -- Class to manipulate an element collector
+ *
+ *   FUNCTION
+ *  This class is derived from the ElementMark class. Beyond the function
+ *  of the ElementMark class, this class also maintains the priority, and
+ *  manages the notify process
+ ******************************************************************************/
+{
+private:
+    /*
+     * the notify priority, is one of following values:
+     * AFTERMODIFY  - this ElementCollector will notify after all
+     *                    internal modifications have finished.
+     * BEFOREMODIFY - this ElementCollector must notify before any
+     *                    internal modification happens.
+     */
+    css::xml::crypto::sax::ElementMarkPriority const m_nPriority;
+
+    /*
+     * the modify flag, representing whether which elementcollector will
+     * modify its data.
+     */
+    bool const m_bToModify;
+
+    /* the notify enable flag, see notifyListener method */
+    bool m_bAbleToNotify;
+
+    /* whether the listener has been notified */
+    bool m_bNotified;
+
+    /* the listener to be notified */
+    css::uno::Reference< css::xml::crypto::sax::XReferenceResolvedListener > m_xReferenceResolvedListener;
+
+public:
+    ElementCollector(
+        sal_Int32 nBufferId,
+        css::xml::crypto::sax::ElementMarkPriority nPriority,
+        bool bToModify,
+        const css::uno::Reference< css::xml::crypto::sax::XReferenceResolvedListener >& xReferenceResolvedListener);
+
+    css::xml::crypto::sax::ElementMarkPriority getPriority() const { return m_nPriority;}
+    bool getModify() const { return m_bToModify;}
+    void notifyListener();
+    void setReferenceResolvedListener(
+        const css::uno::Reference< css::xml::crypto::sax::XReferenceResolvedListener >& referenceResolvedListener);
+    void doNotify();
+};
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/framework/elementmark.cxx b/xmlsecurity/source/framework/elementmark.cxx
new file mode 100644
index 000000000..71444d7cd
--- /dev/null
+++ b/xmlsecurity/source/framework/elementmark.cxx
@@ -0,0 +1,64 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+
+#include "elementmark.hxx"
+
+ElementMark::ElementMark(sal_Int32 nSecurityId, sal_Int32 nBufferId)
+    :m_pBufferNode(nullptr),
+     m_nSecurityId(nSecurityId),
+     m_nBufferId(nBufferId),
+     m_type(css::xml::crypto::sax::ElementMarkType_ELEMENTMARK)
+/****** ElementMark/ElementMark ***********************************************
+ *
+ *   NAME
+ *  ElementMark -- constructor method
+ *
+ *   SYNOPSIS
+ *  ElementMark(nSecurityId, nBufferId);
+ *
+ *   FUNCTION
+ *  construct an ElementMark object.
+ *
+ *   INPUTS
+ *  nSecurityId -   represents which security entity the buffer node is
+ *          related with. Either a signature or an encryption is
+ *          a security entity.
+ *  nBufferId - the id of the element buffered in the document
+ *          wrapper component. The document wrapper component
+ *          uses this id to search the particular buffered
+ *          element.
+ ******************************************************************************/
+{
+}
+
+
+void ElementMark::setBufferNode(const BufferNode* pBufferNode)
+{
+    m_pBufferNode = const_cast<BufferNode*>(pBufferNode);
+}
+
+
+void ElementMark::setSecurityId(sal_Int32 nSecurityId)
+{
+    m_nSecurityId = nSecurityId;
+}
+
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/framework/elementmark.hxx b/xmlsecurity/source/framework/elementmark.hxx
new file mode 100644
index 000000000..e035cc1a5
--- /dev/null
+++ b/xmlsecurity/source/framework/elementmark.hxx
@@ -0,0 +1,70 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#ifndef INCLUDED_XMLSECURITY_SOURCE_FRAMEWORK_ELEMENTMARK_HXX
+#define INCLUDED_XMLSECURITY_SOURCE_FRAMEWORK_ELEMENTMARK_HXX
+
+#include <com/sun/star/xml/crypto/sax/ElementMarkType.hpp>
+
+class BufferNode;
+
+class ElementMark
+/****** elementmark.hxx/CLASS ElementMark *************************************
+ *
+ *   NAME
+ *  ElementMark -- Class to manipulate an element mark
+ *
+ *   FUNCTION
+ *  This class maintains the security id, buffer id and its type for a
+ *  buffer node.
+ ******************************************************************************/
+{
+protected:
+    /* the BufferNode maintained by this object */
+    BufferNode* m_pBufferNode;
+
+    /* the security Id */
+    sal_Int32 m_nSecurityId;
+
+    /* the buffer Id */
+    sal_Int32 const m_nBufferId;
+
+    /*
+     * the type value, is one of following values:
+     * TYPEOFELEMENTMARK - the default value, represents a blocker if
+     *                     not changed
+     * TYPEOFELEMENTCOLLECTOR - represents an ElementCollector
+     */
+    css::xml::crypto::sax::ElementMarkType m_type;
+
+public:
+    ElementMark(sal_Int32 nSecurityId, sal_Int32 nBufferId);
+    virtual ~ElementMark() {};
+
+    BufferNode* getBufferNode() const { return m_pBufferNode;}
+    void setBufferNode(const BufferNode* pBufferNode);
+    sal_Int32 getSecurityId() const { return m_nSecurityId;}
+    void setSecurityId(sal_Int32 nSecurityId);
+    css::xml::crypto::sax::ElementMarkType getType() const { return m_type;}
+    sal_Int32 getBufferId() const { return m_nBufferId;}
+};
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/framework/saxeventkeeperimpl.cxx b/xmlsecurity/source/framework/saxeventkeeperimpl.cxx
new file mode 100644
index 000000000..cde39d929
--- /dev/null
+++ b/xmlsecurity/source/framework/saxeventkeeperimpl.cxx
@@ -0,0 +1,1157 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+
+#include <framework/saxeventkeeperimpl.hxx>
+#include "buffernode.hxx"
+#include "elementmark.hxx"
+#include "elementcollector.hxx"
+#include <com/sun/star/xml/sax/XDocumentHandler.hpp>
+#include <com/sun/star/xml/crypto/sax/ConstOfSecurityId.hpp>
+#include <com/sun/star/xml/wrapper/XXMLDocumentWrapper.hpp>
+#include <com/sun/star/xml/csax/XCompressedDocumentHandler.hpp>
+#include <cppuhelper/supportsservice.hxx>
+#include <osl/diagnose.h>
+#include <rtl/ustrbuf.hxx>
+
+#define IMPLEMENTATION_NAME "com.sun.star.xml.security.framework.SAXEventKeeperImpl"
+
+SAXEventKeeperImpl::SAXEventKeeperImpl( )
+    :m_pCurrentBufferNode(nullptr),
+     m_nNextElementMarkId(1),
+     m_pNewBlocker(nullptr),
+     m_pCurrentBlockingBufferNode(nullptr),
+     m_bIsReleasing(false),
+     m_bIsForwarding(false)
+{
+    m_vElementMarkBuffers.reserve(2);
+    m_vNewElementCollectors.reserve(2);
+    m_vReleasedElementMarkBuffers.reserve(2);
+}
+
+SAXEventKeeperImpl::~SAXEventKeeperImpl()
+{
+    /*
+     * delete the BufferNode tree
+     */
+    m_pRootBufferNode.reset();
+
+    m_pCurrentBufferNode = m_pCurrentBlockingBufferNode = nullptr;
+
+    /*
+     * delete all unfreed ElementMarks
+     */
+    m_vNewElementCollectors.clear();
+    m_pNewBlocker = nullptr;
+}
+
+void SAXEventKeeperImpl::setCurrentBufferNode(BufferNode* pBufferNode)
+/****** SAXEventKeeperImpl/setCurrentBufferNode ******************************
+ *
+ *   NAME
+ *  setCurrentBufferNode -- set a new active BufferNode.
+ *
+ *   SYNOPSIS
+ *  setCurrentBufferNode( pBufferNode );
+ *
+ *   FUNCTION
+ *  connects this BufferNode into the BufferNode tree as a child of the
+ *  current active BufferNode. Then makes this BufferNode as the current
+ *  active BufferNode.
+ *  If the previous active BufferNode points to the root
+ *  BufferNode, which means that no buffering operation was proceeding,
+ *  then notifies the status change listener that buffering  operation
+ *  will begin at once.
+ *
+ *   INPUTS
+ *  pBufferNode - a BufferNode which will be the new active BufferNode
+ ******************************************************************************/
+{
+    if (pBufferNode != m_pCurrentBufferNode)
+    {
+        if ( m_pCurrentBufferNode == m_pRootBufferNode.get() &&
+             m_xSAXEventKeeperStatusChangeListener.is())
+        {
+            m_xSAXEventKeeperStatusChangeListener->collectionStatusChanged(true);
+        }
+
+        if (pBufferNode->getParent() == nullptr)
+        {
+            m_pCurrentBufferNode->addChild(std::unique_ptr<BufferNode>(pBufferNode));
+            pBufferNode->setParent(m_pCurrentBufferNode);
+        }
+
+        m_pCurrentBufferNode = pBufferNode;
+    }
+}
+
+BufferNode* SAXEventKeeperImpl::addNewElementMarkBuffers()
+/****** SAXEventKeeperImpl/addNewElementMarkBuffers **************************
+ *
+ *   NAME
+ *  addNewElementMarkBuffers -- add new ElementCollectors and new Blocker.
+ *
+ *   SYNOPSIS
+ *  pBufferNode = addNewElementMarkBuffers( );
+ *
+ *   FUNCTION
+ *  if there are new ElementCollector or new Blocker to be added, then
+ *  connect all of them with the current BufferNode. In case of the
+ *  current BufferNode doesn't exist, creates one.
+ *  Clears up the new ElementCollector list and the new Blocker pointer.
+ *
+ *   RESULT
+ *  pBufferNode - the BufferNode that has been connected with both new
+ *                ElementCollectors and new Blocker.
+ ******************************************************************************/
+{
+    BufferNode* pBufferNode = nullptr;
+
+    if (m_pNewBlocker || !m_vNewElementCollectors.empty() )
+    {
+        /*
+         * When the current BufferNode is right pointing to the current
+         * working element in the XMLDocumentWrapper component, then
+         * no new BufferNode is needed to create.
+         * This situation can only happen in the "Forwarding" mode.
+         */
+        if ( (m_pCurrentBufferNode != nullptr) &&
+             (m_xXMLDocument->isCurrent(m_pCurrentBufferNode->getXMLElement())))
+        {
+            pBufferNode = m_pCurrentBufferNode;
+        }
+        else
+        {
+            pBufferNode = new BufferNode(m_xXMLDocument->getCurrentElement());
+        }
+
+        if (m_pNewBlocker != nullptr)
+        {
+            pBufferNode->setBlocker(m_pNewBlocker);
+
+            /*
+             * If no blocking before, then notify the status change listener that
+             * the SAXEventKeeper has entered "blocking" status, during which, no
+             * SAX events will be forwarded to the next document handler.
+             */
+            if (m_pCurrentBlockingBufferNode == nullptr)
+            {
+                m_pCurrentBlockingBufferNode = pBufferNode;
+
+                if (m_xSAXEventKeeperStatusChangeListener.is())
+                {
+                    m_xSAXEventKeeperStatusChangeListener->blockingStatusChanged(true);
+                }
+            }
+
+            m_pNewBlocker = nullptr;
+        }
+
+        for( const auto& i : m_vNewElementCollectors )
+        {
+            pBufferNode->addElementCollector(i);
+        }
+        m_vNewElementCollectors.clear();
+    }
+
+    return pBufferNode;
+}
+
+ElementMark* SAXEventKeeperImpl::findElementMarkBuffer(sal_Int32 nId) const
+/****** SAXEventKeeperImpl/findElementMarkBuffer *****************************
+ *
+ *   NAME
+ *  findElementMarkBuffer -- finds an ElementMark.
+ *
+ *   SYNOPSIS
+ *  pElementMark = findElementMarkBuffer( nId );
+ *
+ *   FUNCTION
+ *  searches an ElementMark with the particular Id in the ElementMark
+ *  list.
+ *
+ *   INPUTS
+ *  nId - the Id of the ElementMark to be searched.
+ *
+ *   RESULT
+ *  pElementMark - the ElementMark with the particular Id, or NULL when
+ *                 no such Id exists.
+ ******************************************************************************/
+{
+    ElementMark* pElementMark = nullptr;
+
+    for( auto&& ii : m_vElementMarkBuffers )
+    {
+        if ( nId == ii->getBufferId())
+        {
+            pElementMark = const_cast<ElementMark*>(ii.get());
+            break;
+        }
+    }
+
+    return pElementMark;
+}
+
+void SAXEventKeeperImpl::removeElementMarkBuffer(sal_Int32 nId)
+/****** SAXEventKeeperImpl/removeElementMarkBuffer ***************************
+ *
+ *   NAME
+ *  removeElementMarkBuffer -- removes an ElementMark
+ *
+ *   SYNOPSIS
+ *  removeElementMarkBuffer( nId );
+ *
+ *   FUNCTION
+ *  removes an ElementMark with the particular Id in the ElementMark list.
+ *
+ *   INPUTS
+ *  nId - the Id of the ElementMark to be removed.
+ ******************************************************************************/
+{
+    auto ii = std::find_if(m_vElementMarkBuffers.begin(), m_vElementMarkBuffers.end(),
+        [nId](std::unique_ptr<const ElementMark>& rElementMark) { return nId == rElementMark->getBufferId(); }
+    );
+    if (ii == m_vElementMarkBuffers.end())
+        return;
+
+    /*
+     * checks whether this ElementMark still in the new ElementCollect array
+     */
+    auto jj = std::find_if(m_vNewElementCollectors.begin(), m_vNewElementCollectors.end(),
+        [&ii](const ElementCollector* pElementCollector) { return ii->get() == pElementCollector; }
+    );
+    if (jj != m_vNewElementCollectors.end())
+        m_vNewElementCollectors.erase(jj);
+
+    /*
+     * checks whether this ElementMark is the new Blocker
+     */
+    if (ii->get() == m_pNewBlocker)
+    {
+        m_pNewBlocker = nullptr;
+    }
+
+    m_vElementMarkBuffers.erase( ii );
+}
+
+OUString SAXEventKeeperImpl::printBufferNode(
+    BufferNode const * pBufferNode, sal_Int32 nIndent) const
+/****** SAXEventKeeperImpl/printBufferNode ***********************************
+ *
+ *   NAME
+ *  printBufferNode -- retrieves the information of a BufferNode and its
+ *  branch.
+ *
+ *   SYNOPSIS
+ *  info = printBufferNode( pBufferNode, nIndent );
+ *
+ *   FUNCTION
+ *  all retrieved information includes:
+ *  1. whether it is the current BufferNode;
+ *  2. whether it is the current blocking BufferNode;
+ *  3. the name of the parent element;
+ *  4. the name of this element;
+ *  5. all ElementCollectors working on this BufferNode;
+ *  6. the Blocker working on this BufferNode;
+ *  7. all child BufferNodes' information.
+ *
+ *   INPUTS
+ *  pBufferNode -   the BufferNode from where information will be retrieved.
+ *  nIndent -   how many space characters prefixed before the output
+ *              message.
+ *
+ *   RESULT
+ *  info - the information string
+ ******************************************************************************/
+{
+    OUStringBuffer rc;
+
+    for ( int i=0; i<nIndent; ++i )
+    {
+        rc.append(" ");
+    }
+
+    if (pBufferNode == m_pCurrentBufferNode)
+    {
+        rc.append("[%]");
+    }
+
+    if (pBufferNode == m_pCurrentBlockingBufferNode)
+    {
+        rc.append("[B]");
+    }
+
+    rc.append(" ").append(m_xXMLDocument->getNodeName(pBufferNode->getXMLElement()));
+
+    BufferNode* pParent = const_cast<BufferNode*>(pBufferNode->getParent());
+    if (pParent != nullptr)
+    {
+        rc.append("[").append(m_xXMLDocument->getNodeName(pParent->getXMLElement())).append("]");
+    }
+
+    rc.append(":EC=").append(pBufferNode->printChildren()).append(" BR=");
+
+    ElementMark * pBlocker = pBufferNode->getBlocker();
+    if (pBlocker != nullptr)
+    {
+        rc.append(OUString::number( pBlocker->getBufferId() )).append("(SecId=")
+            .append(OUString::number( pBlocker->getSecurityId() )).append(") ");
+    }
+    rc.append("\n");
+
+    std::vector< std::unique_ptr<BufferNode> > const & vChildren = pBufferNode->getChildren();
+    for( const auto& jj : vChildren )
+    {
+        rc.append(printBufferNode(jj.get(), nIndent+4));
+    }
+
+    return rc.makeStringAndClear();
+}
+
+css::uno::Sequence< css::uno::Reference< css::xml::wrapper::XXMLElementWrapper > >
+    SAXEventKeeperImpl::collectChildWorkingElement(BufferNode const * pBufferNode)
+/****** SAXEventKeeperImpl/collectChildWorkingElement ************************
+ *
+ *   NAME
+ *  collectChildWorkingElement -- collects a BufferNode's all child
+ *  Elements.
+ *
+ *   SYNOPSIS
+ *  list = collectChildWorkingElement( pBufferNode );
+ *
+ *   INPUTS
+ *  pBufferNode - the BufferNode whose child Elements will be collected.
+ *
+ *   RESULT
+ *  list - the child Elements list.
+ ******************************************************************************/
+{
+    std::vector< std::unique_ptr<BufferNode> > const & vChildren = pBufferNode->getChildren();
+
+    css::uno::Sequence < css::uno::Reference<
+        css::xml::wrapper::XXMLElementWrapper > > aChildrenCollection ( vChildren.size());
+
+    sal_Int32 nIndex = 0;
+    for( const auto& i : vChildren )
+    {
+        aChildrenCollection[nIndex] = i->getXMLElement();
+        nIndex++;
+    }
+
+    return aChildrenCollection;
+}
+
+void SAXEventKeeperImpl::smashBufferNode(
+    BufferNode* pBufferNode, bool bClearRoot) const
+/****** SAXEventKeeperImpl/smashBufferNode ***********************************
+ *
+ *   NAME
+ *  smashBufferNode -- removes a BufferNode along with its working
+ *  element.
+ *
+ *   SYNOPSIS
+ *  smashBufferNode( pBufferNode, bClearRoot );
+ *
+ *   FUNCTION
+ *  removes the BufferNode's working element from the DOM document, while
+ *  reserves all ancestor paths for its child BufferNodes.
+ *  when any of the BufferNode's ancestor element is useless, removes it
+ *  too.
+ *  removes the BufferNode from the BufferNode tree.
+ *
+ *   INPUTS
+ *  pBufferNode -   the BufferNode to be removed
+ *  bClearRoot -    whether the root element also needs to be cleared up.
+ *
+ *   NOTES
+ *  when removing a Blocker's BufferNode, the bClearRoot flag should be
+ *  true. Because a Blocker can buffer many SAX events which are not used
+ *  by any other ElementCollector or Blocker.
+ *  When the bClearRoot is set to true, the root BufferNode will be first
+ *  cleared, with a stop flag setting at the next Blocking BufferNode. This
+ *  operation can delete all useless buffered SAX events which are only
+ *  needed by the Blocker to be deleted.
+ ******************************************************************************/
+{
+    if (!pBufferNode->hasAnything())
+    {
+        BufferNode* pParent = const_cast<BufferNode*>(pBufferNode->getParent());
+
+        /*
+         * delete the XML data
+         */
+        if (pParent == m_pRootBufferNode.get())
+        {
+            bool bIsNotBlocking = (m_pCurrentBlockingBufferNode == nullptr);
+            bool bIsBlockInside = false;
+            bool bIsBlockingAfterward = false;
+
+            /*
+             * If this is a blocker, then remove any out-element data
+             * which caused by blocking. The removal process will stop
+             * at the next blocker to avoid removing any useful data.
+             */
+            if (bClearRoot)
+            {
+                css::uno::Sequence< css::uno::Reference< css::xml::wrapper::XXMLElementWrapper > >
+                    aChildElements = collectChildWorkingElement(m_pRootBufferNode.get());
+
+                /*
+                 * the clearUselessData only clearup the content in the
+                 * node, not the node itself.
+                 */
+                m_xXMLDocument->clearUselessData(m_pRootBufferNode->getXMLElement(),
+                    aChildElements,
+                    bIsNotBlocking?nullptr:
+                                   (m_pCurrentBlockingBufferNode->getXMLElement()));
+
+                /*
+                 * remove the node if it is empty, then if its parent is also
+                 * empty, remove it, then if the next parent is also empty,
+                 * remove it,..., until parent become null.
+                 */
+                m_xXMLDocument->collapse( m_pRootBufferNode->getXMLElement() );
+            }
+
+            /*
+             * if blocking, check the relationship between this BufferNode and
+             * the current blocking BufferNode.
+             */
+            if ( !bIsNotBlocking )
+            {
+                /*
+                 * the current blocking BufferNode is a descendant of this BufferNode.
+                 */
+                bIsBlockInside = (nullptr != pBufferNode->isAncestor(m_pCurrentBlockingBufferNode));
+
+                /*
+                 * the current blocking BufferNode locates behind this BufferNode in tree
+                 * order.
+                 */
+                bIsBlockingAfterward = pBufferNode->isPrevious(m_pCurrentBlockingBufferNode);
+            }
+
+            /*
+             * this BufferNode's working element needs to be deleted only when
+             * 1. there is no blocking, or
+             * 2. the current blocking BufferNode is a descendant of this BufferNode,
+             *    (then in the BufferNode's working element, the useless data before the blocking
+             *     element should be deleted.) or
+             * 3. the current blocking BufferNode is locates behind this BufferNode in tree,
+             *    (then the useless data between the blocking element and the working element
+             *     should be deleted.).
+             * Otherwise, this working element should not be deleted.
+             */
+            if ( bIsNotBlocking || bIsBlockInside || bIsBlockingAfterward )
+            {
+                css::uno::Sequence< css::uno::Reference< css::xml::wrapper::XXMLElementWrapper > >
+                    aChildElements = collectChildWorkingElement(pBufferNode);
+
+                /*
+                 * the clearUselessData only clearup the content in the
+                 * node, not the node itself.
+                 */
+                m_xXMLDocument->clearUselessData(pBufferNode->getXMLElement(),
+                    aChildElements,
+                    bIsBlockInside?(m_pCurrentBlockingBufferNode->getXMLElement()):
+                               nullptr);
+
+                /*
+                 * remove the node if it is empty, then if its parent is also
+                 * empty, remove it, then if the next parent is also empty,
+                 * remove it,..., until parent become null.
+                 */
+                m_xXMLDocument->collapse( pBufferNode->getXMLElement() );
+            }
+        }
+
+        sal_Int32 nIndex = pParent->indexOfChild(pBufferNode);
+
+        std::vector< std::unique_ptr<BufferNode> > vChildren = pBufferNode->releaseChildren();
+        pParent->removeChild(pBufferNode); // delete buffernode
+
+        for( auto& i : vChildren )
+        {
+            i->setParent(pParent);
+            pParent->addChild(std::move(i), nIndex);
+            nIndex++;
+        }
+
+    }
+}
+
+BufferNode* SAXEventKeeperImpl::findNextBlockingBufferNode(
+    BufferNode* pStartBufferNode)
+/****** SAXEventKeeperImpl/findNextBlockingBufferNode ************************
+ *
+ *   NAME
+ *  findNextBlockingBufferNode -- finds the next blocking BufferNode
+ *  behind the particular BufferNode.
+ *
+ *   SYNOPSIS
+ *  pBufferNode = findNextBlockingBufferNode( pStartBufferNode );
+ *
+ *   INPUTS
+ *  pStartBufferNode - the BufferNode from where to search the next
+ *                     blocking BufferNode.
+ *
+ *   RESULT
+ *  pBufferNode - the next blocking BufferNode, or NULL if no such
+ *                BufferNode exists.
+ ******************************************************************************/
+{
+    BufferNode* pNext = nullptr;
+
+    if (pStartBufferNode != nullptr)
+    {
+        pNext = pStartBufferNode;
+
+        while (nullptr != (pNext = const_cast<BufferNode*>(pNext->getNextNodeByTreeOrder())))
+        {
+            if (pNext->getBlocker() != nullptr)
+            {
+                break;
+            }
+        }
+    }
+
+    return pNext;
+}
+
+void SAXEventKeeperImpl::diffuse(BufferNode* pBufferNode)
+/****** SAXEventKeeperImpl/diffuse *******************************************
+ *
+ *   NAME
+ *  diffuse -- diffuse the notification.
+ *
+ *   SYNOPSIS
+ *  diffuse( pBufferNode );
+ *
+ *   FUNCTION
+ *  diffuse the collecting completion notification from the specific
+ *  BufferNode along its parent link, until an ancestor which is not
+ *  completely received is met.
+ *
+ *   INPUTS
+ *  pBufferNode - the BufferNode from which the notification will be
+ *                diffused.
+ ******************************************************************************/
+{
+    BufferNode* pParent = pBufferNode;
+
+    while(pParent->isAllReceived())
+    {
+        pParent->elementCollectorNotify();
+        pParent = const_cast<BufferNode*>(pParent->getParent());
+    }
+}
+
+void SAXEventKeeperImpl::releaseElementMarkBuffer()
+/****** SAXEventKeeperImpl/releaseElementMarkBuffer **************************
+ *
+ *   NAME
+ *  releaseElementMarkBuffer -- releases useless ElementMarks
+ *
+ *   SYNOPSIS
+ *  releaseElementMarkBuffer( );
+ *
+ *   FUNCTION
+ *  releases each ElementMark in the releasing list
+ *  m_vReleasedElementMarkBuffers.
+ *  The operation differs between an ElementCollector and a Blocker.
+ ******************************************************************************/
+{
+    m_bIsReleasing = true;
+    while (!m_vReleasedElementMarkBuffers.empty())
+    {
+        auto pId = m_vReleasedElementMarkBuffers.begin();
+        sal_Int32 nId = *pId;
+        m_vReleasedElementMarkBuffers.erase( pId );
+
+        ElementMark* pElementMark = findElementMarkBuffer(nId);
+
+        if (pElementMark != nullptr)
+        {
+            if (css::xml::crypto::sax::ElementMarkType_ELEMENTCOLLECTOR
+                == pElementMark->getType())
+            /*
+             * it is a EC
+             */
+            {
+                ElementCollector* pElementCollector = static_cast<ElementCollector*>(pElementMark);
+
+                css::xml::crypto::sax::ElementMarkPriority nPriority = pElementCollector->getPriority();
+                /*
+                 * Delete the EC from the buffer node.
+                 */
+                BufferNode* pBufferNode = pElementCollector->getBufferNode();
+                pBufferNode->removeElementCollector(pElementCollector);
+
+                if ( nPriority == css::xml::crypto::sax::ElementMarkPriority_BEFOREMODIFY)
+                {
+                    pBufferNode->notifyBranch();
+                }
+
+                /*
+                 * delete the ElementMark
+                 */
+                pElementCollector = nullptr;
+                pElementMark = nullptr;
+                removeElementMarkBuffer(nId);
+
+                /*
+                 * delete the BufferNode
+                 */
+                diffuse(pBufferNode);
+                smashBufferNode(pBufferNode, false);
+            }
+            else
+            /*
+             * it is a Blocker
+             */
+            {
+                /*
+                 * Delete the TH from the buffer node.
+                 */
+                BufferNode *pBufferNode = pElementMark->getBufferNode();
+                pBufferNode->setBlocker(nullptr);
+
+                /*
+                 * If there is a following handler and no blocking now, then
+                 * forward this event
+                 */
+                if (m_pCurrentBlockingBufferNode == pBufferNode)
+                {
+                    /*
+                     * Before forwarding, the next blocking point needs to be
+                     * found.
+                     */
+                    m_pCurrentBlockingBufferNode = findNextBlockingBufferNode(pBufferNode);
+
+                    /*
+                     * Forward the blocked events between these two STHs.
+                     */
+                    if (m_xNextHandler.is())
+                    {
+                        BufferNode* pTempCurrentBufferNode = m_pCurrentBufferNode;
+                        BufferNode* pTempCurrentBlockingBufferNode = m_pCurrentBlockingBufferNode;
+
+                        m_pCurrentBufferNode = pBufferNode;
+                        m_pCurrentBlockingBufferNode = nullptr;
+
+                        m_bIsForwarding = true;
+
+                        m_xXMLDocument->generateSAXEvents(
+                            m_xNextHandler,
+                            this,
+                            pBufferNode->getXMLElement(),
+                            (pTempCurrentBlockingBufferNode == nullptr)?nullptr:(pTempCurrentBlockingBufferNode->getXMLElement()));
+
+                        m_bIsForwarding = false;
+
+                        m_pCurrentBufferNode = pTempCurrentBufferNode;
+                        if (m_pCurrentBlockingBufferNode == nullptr)
+                        {
+                            m_pCurrentBlockingBufferNode = pTempCurrentBlockingBufferNode;
+                        }
+                    }
+
+                    if (m_pCurrentBlockingBufferNode == nullptr &&
+                        m_xSAXEventKeeperStatusChangeListener.is())
+                    {
+                        m_xSAXEventKeeperStatusChangeListener->blockingStatusChanged(false);
+                    }
+                }
+
+                /*
+                 * delete the ElementMark
+                 */
+                pElementMark = nullptr;
+                removeElementMarkBuffer(nId);
+
+                /*
+                 * delete the BufferNode
+                 */
+                diffuse(pBufferNode);
+                smashBufferNode(pBufferNode, true);
+            }
+        }
+    }
+
+    m_bIsReleasing = false;
+
+    if (!m_pRootBufferNode->hasAnything() &&
+        !m_pRootBufferNode->hasChildren() &&
+        m_xSAXEventKeeperStatusChangeListener.is())
+    {
+        m_xSAXEventKeeperStatusChangeListener->bufferStatusChanged(true);
+    }
+}
+
+void SAXEventKeeperImpl::markElementMarkBuffer(sal_Int32 nId)
+/****** SAXEventKeeperImpl/markElementMarkBuffer *****************************
+ *
+ *   NAME
+ *  markElementMarkBuffer -- marks an ElementMark to be released
+ *
+ *   SYNOPSIS
+ *  markElementMarkBuffer( nId );
+ *
+ *   FUNCTION
+ *  puts the ElementMark with the particular Id into the releasing list,
+ *  checks whether the releasing process is running, if not then launch
+ *  this process.
+ *
+ *   INPUTS
+ *  nId - the Id of the ElementMark which will be released
+ ******************************************************************************/
+{
+    m_vReleasedElementMarkBuffers.push_back( nId );
+    if ( !m_bIsReleasing )
+    {
+        releaseElementMarkBuffer();
+    }
+}
+
+sal_Int32 SAXEventKeeperImpl::createElementCollector(
+    css::xml::crypto::sax::ElementMarkPriority nPriority,
+    bool bModifyElement,
+    const css::uno::Reference< css::xml::crypto::sax::XReferenceResolvedListener >& xReferenceResolvedListener)
+/****** SAXEventKeeperImpl/createElementCollector ****************************
+ *
+ *   NAME
+ *  createElementCollector -- creates a new ElementCollector on the
+ *  incoming element.
+ *
+ *   SYNOPSIS
+ *  nId = createElementCollector( nSecurityId, nPriority,
+ *                               bModifyElement,
+ *                               xReferenceResolvedListener );
+ *
+ *   FUNCTION
+ *  allocs a new Id, then create an ElementCollector with this Id value.
+ *  Add the new created ElementCollector to the new ElementCollecotor list.
+ *
+ *   INPUTS
+ *  nPriority -     the priority of the new ElementCollector
+ *  bModifyElement -whether this BufferNode will modify the content of
+ *                  the corresponding element it works on
+ *  xReferenceResolvedListener - the listener for the new ElementCollector.
+ *
+ *   RESULT
+ *  nId - the Id of the new ElementCollector
+ ******************************************************************************/
+{
+    sal_Int32 nId = m_nNextElementMarkId;
+    m_nNextElementMarkId ++;
+
+    ElementCollector* pElementCollector
+        = new ElementCollector(
+            nId,
+            nPriority,
+            bModifyElement,
+            xReferenceResolvedListener);
+
+    m_vElementMarkBuffers.push_back(
+        std::unique_ptr<const ElementMark>(pElementCollector));
+
+    /*
+     * All the new EC to initial EC array.
+     */
+    m_vNewElementCollectors.push_back( pElementCollector );
+
+    return nId;
+}
+
+
+sal_Int32 SAXEventKeeperImpl::createBlocker()
+/****** SAXEventKeeperImpl/createBlocker *************************************
+ *
+ *   NAME
+ *  createBlocker -- creates a new Blocker on the incoming element.
+ *
+ *   SYNOPSIS
+ *  nId = createBlocker( nSecurityId );
+ *
+ *   RESULT
+ *  nId - the Id of the new Blocker
+ ******************************************************************************/
+{
+    sal_Int32 nId = m_nNextElementMarkId;
+    m_nNextElementMarkId ++;
+
+    OSL_ASSERT(m_pNewBlocker == nullptr);
+
+    m_pNewBlocker = new ElementMark(css::xml::crypto::sax::ConstOfSecurityId::UNDEFINEDSECURITYID, nId);
+    m_vElementMarkBuffers.push_back(
+        std::unique_ptr<const ElementMark>(m_pNewBlocker));
+
+    return nId;
+}
+
+/* XSAXEventKeeper */
+sal_Int32 SAL_CALL SAXEventKeeperImpl::addElementCollector(  )
+{
+    return createElementCollector(
+        css::xml::crypto::sax::ElementMarkPriority_AFTERMODIFY,
+        false,
+        nullptr);
+}
+
+void SAL_CALL SAXEventKeeperImpl::removeElementCollector( sal_Int32 id )
+{
+    markElementMarkBuffer(id);
+}
+
+sal_Int32 SAL_CALL SAXEventKeeperImpl::addBlocker(  )
+{
+    return createBlocker();
+}
+
+void SAL_CALL SAXEventKeeperImpl::removeBlocker( sal_Int32 id )
+{
+    markElementMarkBuffer(id);
+}
+
+sal_Bool SAL_CALL SAXEventKeeperImpl::isBlocking(  )
+{
+    return (m_pCurrentBlockingBufferNode != nullptr);
+}
+
+css::uno::Reference< css::xml::wrapper::XXMLElementWrapper > SAL_CALL
+    SAXEventKeeperImpl::getElement( sal_Int32 id )
+{
+    css::uno::Reference< css::xml::wrapper::XXMLElementWrapper > rc;
+
+    ElementMark* pElementMark = findElementMarkBuffer(id);
+    if (pElementMark != nullptr)
+    {
+        rc = pElementMark->getBufferNode()->getXMLElement();
+    }
+
+    return rc;
+}
+
+void SAL_CALL SAXEventKeeperImpl::setElement(
+    sal_Int32 id,
+    const css::uno::Reference< css::xml::wrapper::XXMLElementWrapper >& aElement )
+{
+    if (aElement.is())
+    {
+        m_xXMLDocument->rebuildIDLink(aElement);
+
+        ElementMark* pElementMark = findElementMarkBuffer(id);
+
+        if (pElementMark != nullptr)
+        {
+            BufferNode* pBufferNode = pElementMark->getBufferNode();
+            if (pBufferNode != nullptr)
+            {
+                const bool bIsCurrent = m_xXMLDocument->isCurrent(pBufferNode->getXMLElement());
+                pBufferNode->setXMLElement(aElement);
+
+                if (bIsCurrent)
+                {
+                    m_xXMLDocument->setCurrentElement(aElement);
+                }
+            }
+        }
+    }
+    else
+    {
+        removeElementCollector( id );
+    }
+}
+
+css::uno::Reference< css::xml::sax::XDocumentHandler > SAL_CALL SAXEventKeeperImpl::setNextHandler(
+    const css::uno::Reference< css::xml::sax::XDocumentHandler >& xNewHandler )
+{
+    css::uno::Reference< css::xml::sax::XDocumentHandler > xOldHandler = m_xNextHandler;
+
+    m_xNextHandler = xNewHandler;
+    return xOldHandler;
+}
+
+OUString SAL_CALL SAXEventKeeperImpl::printBufferNodeTree()
+{
+    OUString rc = "ElementMarkBuffers: size = "
+        + OUString::number(m_vElementMarkBuffers.size())
+        + "\nCurrentBufferNode: "
+        + m_xXMLDocument->getNodeName(m_pCurrentBufferNode->getXMLElement())
+        + "\n" + printBufferNode(m_pRootBufferNode.get(), 0);
+
+    return rc;
+}
+
+css::uno::Reference< css::xml::wrapper::XXMLElementWrapper > SAL_CALL SAXEventKeeperImpl::getCurrentBlockingNode()
+{
+    css::uno::Reference< css::xml::wrapper::XXMLElementWrapper > rc;
+
+    if (m_pCurrentBlockingBufferNode != nullptr)
+    {
+        rc = m_pCurrentBlockingBufferNode->getXMLElement();
+    }
+
+    return rc;
+}
+
+/* XSecuritySAXEventKeeper */
+sal_Int32 SAL_CALL SAXEventKeeperImpl::addSecurityElementCollector(
+    css::xml::crypto::sax::ElementMarkPriority priority,
+    sal_Bool modifyElement )
+{
+    return createElementCollector(
+        priority,
+        modifyElement,
+        nullptr);
+}
+
+void SAL_CALL SAXEventKeeperImpl::setSecurityId( sal_Int32 id, sal_Int32 securityId )
+{
+    ElementMark* pElementMark = findElementMarkBuffer(id);
+    if (pElementMark != nullptr)
+    {
+        pElementMark->setSecurityId(securityId);
+    }
+}
+
+
+/* XReferenceResolvedBroadcaster */
+void SAL_CALL SAXEventKeeperImpl::addReferenceResolvedListener(
+    sal_Int32 referenceId,
+    const css::uno::Reference< css::xml::crypto::sax::XReferenceResolvedListener >& listener )
+{
+    ElementCollector* pElementCollector = static_cast<ElementCollector*>(findElementMarkBuffer(referenceId));
+    if (pElementCollector != nullptr)
+    {
+        pElementCollector->setReferenceResolvedListener(listener);
+    }
+}
+
+void SAL_CALL SAXEventKeeperImpl::removeReferenceResolvedListener(
+    sal_Int32 /*referenceId*/,
+    const css::uno::Reference< css::xml::crypto::sax::XReferenceResolvedListener >&)
+{
+}
+
+/* XSAXEventKeeperStatusChangeBroadcaster */
+void SAL_CALL SAXEventKeeperImpl::addSAXEventKeeperStatusChangeListener(
+    const css::uno::Reference< css::xml::crypto::sax::XSAXEventKeeperStatusChangeListener >& listener )
+{
+    m_xSAXEventKeeperStatusChangeListener = listener;
+}
+
+void SAL_CALL SAXEventKeeperImpl::removeSAXEventKeeperStatusChangeListener(
+    const css::uno::Reference< css::xml::crypto::sax::XSAXEventKeeperStatusChangeListener >&)
+{
+}
+
+/* XDocumentHandler */
+void SAL_CALL SAXEventKeeperImpl::startDocument(  )
+{
+    if ( m_xNextHandler.is())
+    {
+        m_xNextHandler->startDocument();
+    }
+}
+
+void SAL_CALL SAXEventKeeperImpl::endDocument(  )
+{
+    if ( m_xNextHandler.is())
+    {
+        m_xNextHandler->endDocument();
+    }
+}
+
+void SAL_CALL SAXEventKeeperImpl::startElement(
+    const OUString& aName,
+    const css::uno::Reference< css::xml::sax::XAttributeList >& xAttribs )
+{
+    /*
+     * If there is a following handler and no blocking now, then
+     * forward this event
+     */
+    if ((m_pCurrentBlockingBufferNode == nullptr) &&
+        (m_xNextHandler.is()) &&
+        (!m_bIsForwarding) &&
+        (m_pNewBlocker == nullptr))
+    {
+        m_xNextHandler->startElement(aName, xAttribs);
+    }
+    /*
+     * If not forwarding, buffer this startElement.
+     */
+    if (!m_bIsForwarding)
+    {
+        sal_Int32 nLength = xAttribs->getLength();
+        css::uno::Sequence< css::xml::csax::XMLAttribute > aAttributes (nLength);
+
+        for ( int i = 0; i<nLength; ++i )
+        {
+            aAttributes[i].sName = xAttribs->getNameByIndex(static_cast<short>(i));
+            aAttributes[i].sValue =xAttribs->getValueByIndex(static_cast<short>(i));
+        }
+
+        m_xCompressedDocumentHandler->compressedStartElement(aName, aAttributes);
+    }
+
+    BufferNode* pBufferNode = addNewElementMarkBuffers();
+    if (pBufferNode != nullptr)
+    {
+        setCurrentBufferNode(pBufferNode);
+    }
+}
+
+void SAL_CALL SAXEventKeeperImpl::endElement( const OUString& aName )
+{
+    const bool bIsCurrent = m_xXMLDocument->isCurrent(m_pCurrentBufferNode->getXMLElement());
+
+    /*
+     * If there is a following handler and no blocking now, then
+     * forward this event
+     */
+    if ((m_pCurrentBlockingBufferNode == nullptr) &&
+        (m_xNextHandler.is()) &&
+        (!m_bIsForwarding))
+    {
+        m_xNextHandler->endElement(aName);
+    }
+
+    if ((m_pCurrentBlockingBufferNode != nullptr) ||
+        (m_pCurrentBufferNode != m_pRootBufferNode.get()) ||
+        (!m_xXMLDocument->isCurrentElementEmpty()))
+    {
+        if (!m_bIsForwarding)
+        {
+            m_xCompressedDocumentHandler->compressedEndElement(aName);
+        }
+
+        /*
+        * If the current buffer node has not notified yet, and
+        * the current buffer node is waiting for the current element,
+        * then let it notify.
+        */
+        if (bIsCurrent && (m_pCurrentBufferNode != m_pRootBufferNode.get()))
+        {
+            BufferNode* pOldCurrentBufferNode = m_pCurrentBufferNode;
+            m_pCurrentBufferNode = const_cast<BufferNode*>(m_pCurrentBufferNode->getParent());
+
+            pOldCurrentBufferNode->setReceivedAll();
+
+            if ((m_pCurrentBufferNode == m_pRootBufferNode.get()) &&
+                m_xSAXEventKeeperStatusChangeListener.is())
+            {
+                m_xSAXEventKeeperStatusChangeListener->collectionStatusChanged(false);
+            }
+        }
+    }
+    else
+    {
+        if (!m_bIsForwarding)
+        {
+            m_xXMLDocument->removeCurrentElement();
+        }
+    }
+}
+
+void SAL_CALL SAXEventKeeperImpl::characters( const OUString& aChars )
+{
+    if (!m_bIsForwarding)
+    {
+        if ((m_pCurrentBlockingBufferNode == nullptr) && m_xNextHandler.is())
+        {
+            m_xNextHandler->characters(aChars);
+        }
+
+        if ((m_pCurrentBlockingBufferNode != nullptr) ||
+            (m_pCurrentBufferNode != m_pRootBufferNode.get()))
+        {
+            m_xCompressedDocumentHandler->compressedCharacters(aChars);
+        }
+    }
+}
+
+void SAL_CALL SAXEventKeeperImpl::ignorableWhitespace( const OUString& aWhitespaces )
+{
+    characters( aWhitespaces );
+}
+
+void SAL_CALL SAXEventKeeperImpl::processingInstruction(
+    const OUString& aTarget, const OUString& aData )
+{
+    if (!m_bIsForwarding)
+    {
+        if ((m_pCurrentBlockingBufferNode == nullptr) && m_xNextHandler.is())
+        {
+            m_xNextHandler->processingInstruction(aTarget, aData);
+        }
+
+        if ((m_pCurrentBlockingBufferNode != nullptr) ||
+            (m_pCurrentBufferNode != m_pRootBufferNode.get()))
+        {
+            m_xCompressedDocumentHandler->compressedProcessingInstruction(aTarget, aData);
+        }
+    }
+}
+
+void SAL_CALL SAXEventKeeperImpl::setDocumentLocator( const css::uno::Reference< css::xml::sax::XLocator >&)
+{
+}
+
+/* XInitialization */
+void SAL_CALL SAXEventKeeperImpl::initialize( const css::uno::Sequence< css::uno::Any >& aArguments )
+{
+    OSL_ASSERT(aArguments.getLength() == 1);
+
+    aArguments[0] >>= m_xXMLDocument;
+    m_xDocumentHandler.set( m_xXMLDocument, css::uno::UNO_QUERY );
+    m_xCompressedDocumentHandler.set( m_xXMLDocument, css::uno::UNO_QUERY );
+
+    m_pRootBufferNode.reset( new BufferNode(m_xXMLDocument->getCurrentElement()) );
+    m_pCurrentBufferNode = m_pRootBufferNode.get();
+}
+
+OUString SAXEventKeeperImpl_getImplementationName ()
+{
+    return IMPLEMENTATION_NAME;
+}
+
+css::uno::Sequence< OUString > SAXEventKeeperImpl_getSupportedServiceNames(  )
+{
+    css::uno::Sequence<OUString> aRet { "com.sun.star.xml.crypto.sax.SAXEventKeeper" };
+    return aRet;
+}
+
+/* XServiceInfo */
+OUString SAL_CALL SAXEventKeeperImpl::getImplementationName(  )
+{
+    return SAXEventKeeperImpl_getImplementationName();
+}
+
+sal_Bool SAL_CALL SAXEventKeeperImpl::supportsService( const OUString& rServiceName )
+{
+    return cppu::supportsService(this, rServiceName);
+}
+
+css::uno::Sequence< OUString > SAL_CALL SAXEventKeeperImpl::getSupportedServiceNames(  )
+{
+    return SAXEventKeeperImpl_getSupportedServiceNames();
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/framework/securityengine.cxx b/xmlsecurity/source/framework/securityengine.cxx
new file mode 100644
index 000000000..e276163d4
--- /dev/null
+++ b/xmlsecurity/source/framework/securityengine.cxx
@@ -0,0 +1,67 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+
+#include <framework/securityengine.hxx>
+
+
+SecurityEngine::SecurityEngine()
+    :m_nIdOfTemplateEC(-1),
+     m_nNumOfResolvedReferences(0),
+     m_nIdOfKeyEC(-1),
+     m_bMissionDone(false),
+     m_nSecurityId(-1),
+     m_nStatus(css::xml::crypto::SecurityOperationStatus_UNKNOWN)
+{
+}
+
+/* XReferenceResolvedListener */
+void SAL_CALL SecurityEngine::referenceResolved( sal_Int32 /*referenceId*/)
+{
+    m_nNumOfResolvedReferences++;
+    tryToPerform();
+}
+
+/* XKeyCollector */
+void SAL_CALL SecurityEngine::setKeyId( sal_Int32 id )
+{
+    m_nIdOfKeyEC = id;
+    tryToPerform();
+}
+
+/* XMissionTaker */
+sal_Bool SAL_CALL SecurityEngine::endMission(  )
+{
+    bool rc = m_bMissionDone;
+
+    if (!rc)
+    {
+        clearUp( );
+
+        notifyResultListener();
+        m_bMissionDone = true;
+    }
+
+    m_xResultListener = nullptr;
+    m_xSAXEventKeeper = nullptr;
+
+    return rc;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/framework/signaturecreatorimpl.cxx b/xmlsecurity/source/framework/signaturecreatorimpl.cxx
new file mode 100644
index 000000000..a3d8cd458
--- /dev/null
+++ b/xmlsecurity/source/framework/signaturecreatorimpl.cxx
@@ -0,0 +1,178 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+
+#include <framework/signaturecreatorimpl.hxx>
+#include <framework/xmlsignaturetemplateimpl.hxx>
+#include <com/sun/star/xml/crypto/XXMLSignatureTemplate.hpp>
+#include <cppuhelper/supportsservice.hxx>
+#include <osl/diagnose.h>
+#include <rtl/ref.hxx>
+
+namespace com::sun::star::xml::wrapper { class XXMLElementWrapper; }
+
+using namespace com::sun::star::uno;
+
+#define IMPLEMENTATION_NAME "com.sun.star.xml.security.framework.SignatureCreatorImpl"
+
+SignatureCreatorImpl::SignatureCreatorImpl()
+    : SignatureCreatorImpl_Base(), m_nIdOfBlocker(-1)
+{
+}
+
+SignatureCreatorImpl::~SignatureCreatorImpl( )
+{
+}
+
+void SignatureCreatorImpl::notifyResultListener() const
+/****** SignatureCreatorImpl/notifyResultListener *****************************
+ *
+ *   NAME
+ *  notifyResultListener -- notifies the listener about the signature
+ *  creation result.
+ ******************************************************************************/
+{
+    css::uno::Reference< css::xml::crypto::sax::XSignatureCreationResultListener >
+        xSignatureCreationResultListener ( m_xResultListener , css::uno::UNO_QUERY ) ;
+
+    xSignatureCreationResultListener->signatureCreated( m_nSecurityId, m_nStatus );
+}
+
+void SignatureCreatorImpl::startEngine(const rtl::Reference<XMLSignatureTemplateImpl>& xSignatureTemplate)
+/****** SignatureCreatorImpl/startEngine *************************************
+ *
+ *   NAME
+ *  startEngine -- generates the signature.
+ *
+ *   FUNCTION
+ *  generates the signature element, then if succeeds, updates the link
+ *  of old template element to the new signature element in
+ *  SAXEventKeeper.
+ *
+ *   INPUTS
+ *  xSignatureTemplate - the signature template (along with all referenced
+ *  elements) to be signed.
+ ******************************************************************************/
+{
+    css::uno::Reference< css::xml::crypto::XXMLSignatureTemplate > xResultTemplate;
+    try
+    {
+        xResultTemplate = m_xXMLSignature->generate(css::uno::Reference<css::xml::crypto::XXMLSignatureTemplate>(xSignatureTemplate.get()), m_xSecurityEnvironment);
+        m_nStatus = xResultTemplate->getStatus();
+    }
+    catch( css::uno::Exception& )
+    {
+        m_nStatus = css::xml::crypto::SecurityOperationStatus_RUNTIMEERROR_FAILED;
+    }
+
+    if (m_nStatus == css::xml::crypto::SecurityOperationStatus_OPERATION_SUCCEEDED)
+    {
+        css::uno::Reference < css::xml::wrapper::XXMLElementWrapper > xResultSignature = xResultTemplate->getTemplate();
+        m_xSAXEventKeeper->setElement(m_nIdOfTemplateEC, xResultSignature);
+    }
+}
+
+void SignatureCreatorImpl::clearUp() const
+/****** SignatureCreatorImpl/clearUp *****************************************
+ *
+ *   NAME
+ *  clearUp -- clear up all resources used by the signature generation.
+ *
+ *   SYNOPSIS
+ *  clearUp( );
+ *
+ *   FUNCTION
+ *  cleaning resources up includes:
+ *  1. SignatureEngine's clearing up;
+ *  2. releases the Blocker for the signature template element.
+ ******************************************************************************/
+{
+    SignatureEngine::clearUp();
+
+    if (m_nIdOfBlocker != -1)
+    {
+        m_xSAXEventKeeper->removeBlocker(m_nIdOfBlocker);
+    }
+}
+
+/* XBlockerMonitor */
+void SAL_CALL SignatureCreatorImpl::setBlockerId( sal_Int32 id )
+{
+    m_nIdOfBlocker = id;
+    tryToPerform();
+}
+
+/* XSignatureCreationResultBroadcaster */
+void SAL_CALL SignatureCreatorImpl::addSignatureCreationResultListener(
+    const css::uno::Reference< css::xml::crypto::sax::XSignatureCreationResultListener >& listener )
+{
+    m_xResultListener = listener;
+    tryToPerform();
+}
+
+void SAL_CALL SignatureCreatorImpl::removeSignatureCreationResultListener(
+    const css::uno::Reference< css::xml::crypto::sax::XSignatureCreationResultListener >&)
+{
+}
+
+/* XInitialization */
+void SAL_CALL SignatureCreatorImpl::initialize( const css::uno::Sequence< css::uno::Any >& aArguments )
+{
+    OSL_ASSERT(aArguments.getLength() == 5);
+
+    OUString ouTempString;
+
+    aArguments[0] >>= ouTempString;
+    m_nSecurityId = ouTempString.toInt32();
+    aArguments[1] >>= m_xSAXEventKeeper;
+    aArguments[2] >>= ouTempString;
+    m_nIdOfTemplateEC = ouTempString.toInt32();
+    aArguments[3] >>= m_xSecurityEnvironment;
+    aArguments[4] >>= m_xXMLSignature;
+}
+
+
+OUString SignatureCreatorImpl_getImplementationName ()
+{
+    return IMPLEMENTATION_NAME;
+}
+
+css::uno::Sequence< OUString > SignatureCreatorImpl_getSupportedServiceNames(  )
+{
+    css::uno::Sequence<OUString> aRet { "com.sun.star.xml.crypto.sax.SignatureCreator" };
+    return aRet;
+}
+
+/* XServiceInfo */
+OUString SAL_CALL SignatureCreatorImpl::getImplementationName(  )
+{
+    return SignatureCreatorImpl_getImplementationName();
+}
+
+sal_Bool SAL_CALL SignatureCreatorImpl::supportsService( const OUString& rServiceName )
+{
+    return cppu::supportsService(this, rServiceName);
+}
+
+css::uno::Sequence< OUString > SAL_CALL SignatureCreatorImpl::getSupportedServiceNames(  )
+{
+    return SignatureCreatorImpl_getSupportedServiceNames();
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/framework/signatureengine.cxx b/xmlsecurity/source/framework/signatureengine.cxx
new file mode 100644
index 000000000..095b2d04d
--- /dev/null
+++ b/xmlsecurity/source/framework/signatureengine.cxx
@@ -0,0 +1,197 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+
+#include <framework/signatureengine.hxx>
+#include <framework/xmlsignaturetemplateimpl.hxx>
+#include <rtl/ref.hxx>
+
+namespace com::sun::star::xml::wrapper { class XXMLElementWrapper; }
+
+using namespace com::sun::star::uno;
+
+SignatureEngine::SignatureEngine()
+    : m_nTotalReferenceNumber(-1)
+{
+}
+
+bool SignatureEngine::checkReady() const
+/****** SignatureEngine/checkReady *******************************************
+ *
+ *   NAME
+ *  checkReady -- checks the conditions for the main operation.
+ *
+ *   SYNOPSIS
+ *  bReady = checkReady( );
+ *
+ *   FUNCTION
+ *  checks whether all following conditions are satisfied:
+ *  1. the main operation has't begun yet;
+ *  2. the key material is known;
+ *  3. the amount of reference is known;
+ *  4. all of referenced elements, the key element and the signature
+ *     template are buffered.
+ *
+ *   RESULT
+ *  bReady - true if all conditions are satisfied, false otherwise
+ ******************************************************************************/
+{
+    bool rc = true;
+
+    sal_Int32 nKeyInc = 0;
+    if (m_nIdOfKeyEC != 0)
+    {
+        nKeyInc = 1;
+    }
+
+    if (m_bMissionDone ||
+        m_nIdOfKeyEC == -1 ||
+        m_nTotalReferenceNumber == -1 ||
+        m_nTotalReferenceNumber+1+nKeyInc > m_nNumOfResolvedReferences)
+    {
+        rc = false;
+    }
+
+    return rc;
+}
+
+void SignatureEngine::tryToPerform( )
+/****** SignatureEngine/tryToPerform *****************************************
+ *
+ *   NAME
+ *  tryToPerform -- tries to perform the signature operation.
+ *
+ *   FUNCTION
+ *  if the situation is ready, perform following operations.
+ *  1. prepares a signature template;
+ *  2. calls the signature bridge component;
+ *  3. clears up all used resources;
+ *  4. notifies the result listener;
+ *  5. sets the "accomplishment" flag.
+ ******************************************************************************/
+{
+    if (checkReady())
+    {
+        rtl::Reference<XMLSignatureTemplateImpl> xSignatureTemplate = new XMLSignatureTemplateImpl();
+
+        css::uno::Reference< css::xml::wrapper::XXMLElementWrapper >
+            xXMLElement = m_xSAXEventKeeper->getElement( m_nIdOfTemplateEC );
+
+        xSignatureTemplate->setTemplate(xXMLElement);
+
+        for( const auto i : m_vReferenceIds )
+        {
+            xXMLElement = m_xSAXEventKeeper->getElement( i );
+            xSignatureTemplate->setTarget(xXMLElement);
+        }
+
+        /*
+         * set the Uri binding
+         */
+        xSignatureTemplate->setBinding( this );
+
+        startEngine(xSignatureTemplate);
+
+        /*
+         * done
+         */
+        clearUp( );
+
+        notifyResultListener();
+
+        m_bMissionDone = true;
+    }
+}
+
+void SignatureEngine::clearUp( ) const
+/****** SignatureEngine/clearUp **********************************************
+ *
+ *   NAME
+ *  clearUp -- clear up all resources used by this operation.
+ *
+ *   FUNCTION
+ *  cleaning resources up includes:
+ *  1. releases the ElementCollector for the signature template element;
+ *  2. releases ElementCollectors for referenced elements;
+ *  3. releases the ElementCollector for the key element, if there is one.
+ ******************************************************************************/
+{
+    css::uno::Reference < css::xml::crypto::sax::XReferenceResolvedBroadcaster >
+        xReferenceResolvedBroadcaster( m_xSAXEventKeeper, css::uno::UNO_QUERY );
+    xReferenceResolvedBroadcaster->removeReferenceResolvedListener(
+        m_nIdOfTemplateEC,
+        static_cast<const css::uno::Reference < css::xml::crypto::sax::XReferenceResolvedListener > >(static_cast<SecurityEngine *>(const_cast<SignatureEngine *>(this))));
+
+    m_xSAXEventKeeper->removeElementCollector(m_nIdOfTemplateEC);
+
+    for( const auto& i : m_vReferenceIds )
+    {
+        xReferenceResolvedBroadcaster->removeReferenceResolvedListener(
+            i,
+            static_cast<const css::uno::Reference < css::xml::crypto::sax::XReferenceResolvedListener > >(static_cast<SecurityEngine *>(const_cast<SignatureEngine *>(this))));
+        m_xSAXEventKeeper->removeElementCollector(i);
+    }
+
+    if (m_nIdOfKeyEC != 0 && m_nIdOfKeyEC != -1)
+    {
+        m_xSAXEventKeeper->removeElementCollector(m_nIdOfKeyEC);
+    }
+}
+
+/* XReferenceCollector */
+void SAL_CALL SignatureEngine::setReferenceCount( sal_Int32 count )
+{
+    m_nTotalReferenceNumber = count;
+    tryToPerform();
+}
+
+void SAL_CALL SignatureEngine::setReferenceId( sal_Int32 id )
+{
+    m_vReferenceIds.push_back( id );
+}
+
+/* XUriBinding */
+void SAL_CALL SignatureEngine::setUriBinding(
+    const OUString& uri,
+    const css::uno::Reference< css::io::XInputStream >& aInputStream )
+{
+    m_vUris.push_back(uri);
+    m_vXInputStreams.push_back(aInputStream);
+}
+
+css::uno::Reference< css::io::XInputStream > SAL_CALL SignatureEngine::getUriBinding( const OUString& uri )
+{
+    css::uno::Reference< css::io::XInputStream > xInputStream;
+
+    int size = m_vUris.size();
+
+    for( int i=0; i<size; ++i)
+    {
+        if (m_vUris[i] == uri)
+        {
+            xInputStream = m_vXInputStreams[i];
+            break;
+        }
+    }
+
+    return xInputStream;
+}
+
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/framework/signatureverifierimpl.cxx b/xmlsecurity/source/framework/signatureverifierimpl.cxx
new file mode 100644
index 000000000..4daf8d203
--- /dev/null
+++ b/xmlsecurity/source/framework/signatureverifierimpl.cxx
@@ -0,0 +1,134 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+
+#include <framework/signatureverifierimpl.hxx>
+#include <framework/xmlsignaturetemplateimpl.hxx>
+#include <com/sun/star/xml/crypto/XXMLSignatureTemplate.hpp>
+#include <cppuhelper/supportsservice.hxx>
+#include <osl/diagnose.h>
+#include <rtl/ref.hxx>
+
+
+#define IMPLEMENTATION_NAME "com.sun.star.xml.security.framework.SignatureVerifierImpl"
+
+SignatureVerifierImpl::SignatureVerifierImpl()
+  : SignatureVerifierImpl_Base()
+{
+}
+
+SignatureVerifierImpl::~SignatureVerifierImpl()
+{
+}
+
+void SignatureVerifierImpl::notifyResultListener() const
+/****** SignatureVerifierImpl/notifyResultListener ***************************
+ *
+ *   NAME
+ *  notifyResultListener -- notifies the listener about the verify result.
+ ******************************************************************************/
+{
+    css::uno::Reference< css::xml::crypto::sax::XSignatureVerifyResultListener >
+        xSignatureVerifyResultListener ( m_xResultListener , css::uno::UNO_QUERY ) ;
+
+    xSignatureVerifyResultListener->signatureVerified( m_nSecurityId, m_nStatus );
+}
+
+void SignatureVerifierImpl::startEngine( const rtl::Reference<XMLSignatureTemplateImpl>& xSignatureTemplate)
+/****** SignatureVerifierImpl/startEngine ************************************
+ *
+ *   NAME
+ *  startEngine -- verifies the signature.
+ *
+ *   INPUTS
+ *  xSignatureTemplate - the signature template (along with all referenced
+ *  elements) to be verified.
+ ******************************************************************************/
+{
+    css::uno::Reference< css::xml::crypto::XXMLSignatureTemplate > xResultTemplate;
+    try
+    {
+        xResultTemplate = m_xXMLSignature->validate(css::uno::Reference<css::xml::crypto::XXMLSignatureTemplate>(xSignatureTemplate.get()), m_xXMLSecurityContext);
+        m_nStatus = xResultTemplate->getStatus();
+    }
+    catch( css::uno::Exception& )
+    {
+        m_nStatus = css::xml::crypto::SecurityOperationStatus_RUNTIMEERROR_FAILED;
+    }
+}
+
+/* XSignatureVerifyResultBroadcaster */
+void SAL_CALL SignatureVerifierImpl::addSignatureVerifyResultListener(
+    const css::uno::Reference< css::xml::crypto::sax::XSignatureVerifyResultListener >& listener )
+{
+    m_xResultListener = listener;
+    tryToPerform();
+}
+
+void SAL_CALL SignatureVerifierImpl::removeSignatureVerifyResultListener(
+    const css::uno::Reference< css::xml::crypto::sax::XSignatureVerifyResultListener >&)
+{
+}
+
+/* XInitialization */
+void SAL_CALL SignatureVerifierImpl::initialize(
+    const css::uno::Sequence< css::uno::Any >& aArguments )
+{
+    OSL_ASSERT(aArguments.getLength() == 5);
+
+    OUString ouTempString;
+
+    aArguments[0] >>= ouTempString;
+    m_nSecurityId = ouTempString.toInt32();
+    aArguments[1] >>= m_xSAXEventKeeper;
+    aArguments[2] >>= ouTempString;
+    m_nIdOfTemplateEC = ouTempString.toInt32();
+    aArguments[3] >>= m_xXMLSecurityContext;
+    aArguments[4] >>= m_xXMLSignature;
+}
+
+
+OUString SignatureVerifierImpl_getImplementationName ()
+{
+    return IMPLEMENTATION_NAME;
+}
+
+css::uno::Sequence< OUString > SignatureVerifierImpl_getSupportedServiceNames(  )
+{
+    css::uno::Sequence<OUString> aRet { "com.sun.star.xml.crypto.sax.SignatureVerifier" };
+    return aRet;
+}
+
+/* XServiceInfo */
+OUString SAL_CALL SignatureVerifierImpl::getImplementationName(  )
+{
+    return SignatureVerifierImpl_getImplementationName();
+}
+
+sal_Bool SAL_CALL SignatureVerifierImpl::supportsService( const OUString& rServiceName )
+{
+    return cppu::supportsService(this, rServiceName);
+}
+
+css::uno::Sequence< OUString > SAL_CALL SignatureVerifierImpl::getSupportedServiceNames(  )
+{
+    return SignatureVerifierImpl_getSupportedServiceNames();
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/framework/xmlsignaturetemplateimpl.cxx b/xmlsecurity/source/framework/xmlsignaturetemplateimpl.cxx
new file mode 100644
index 000000000..de6cf54cd
--- /dev/null
+++ b/xmlsecurity/source/framework/xmlsignaturetemplateimpl.cxx
@@ -0,0 +1,123 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <sal/config.h>
+#include <rtl/ustring.hxx>
+#include <framework/xmlsignaturetemplateimpl.hxx>
+#include <comphelper/sequence.hxx>
+#include <cppuhelper/supportsservice.hxx>
+
+using namespace ::com::sun::star::uno ;
+using ::com::sun::star::lang::XMultiServiceFactory ;
+
+using ::com::sun::star::xml::wrapper::XXMLElementWrapper ;
+using ::com::sun::star::xml::crypto::XXMLSignatureTemplate ;
+
+XMLSignatureTemplateImpl::XMLSignatureTemplateImpl()
+    :m_nStatus ( css::xml::crypto::SecurityOperationStatus_UNKNOWN )
+{
+}
+
+XMLSignatureTemplateImpl::~XMLSignatureTemplateImpl() {
+}
+
+/* XXMLSignatureTemplate */
+void SAL_CALL XMLSignatureTemplateImpl::setTemplate( const Reference< XXMLElementWrapper >& aTemplate )
+{
+    m_xTemplate = aTemplate ;
+}
+
+/* XXMLSignatureTemplate */
+Reference< XXMLElementWrapper > SAL_CALL XMLSignatureTemplateImpl::getTemplate()
+{
+    return m_xTemplate ;
+}
+
+void SAL_CALL XMLSignatureTemplateImpl::setTarget( const css::uno::Reference< css::xml::wrapper::XXMLElementWrapper >& aXmlElement )
+{
+    targets.push_back( aXmlElement );
+}
+
+css::uno::Sequence< css::uno::Reference< css::xml::wrapper::XXMLElementWrapper > > SAL_CALL XMLSignatureTemplateImpl::getTargets()
+{
+    sal_Int32 length = targets.size();
+    css::uno::Sequence< css::uno::Reference< css::xml::wrapper::XXMLElementWrapper > > aTargets (length);
+
+    sal_Int32 i;
+
+    for (i=0; i<length; i++)
+    {
+        aTargets[i] = targets[i];
+    }
+
+    return aTargets;
+}
+
+void SAL_CALL XMLSignatureTemplateImpl::setBinding(
+    const css::uno::Reference< css::xml::crypto::XUriBinding >& aUriBinding )
+{
+    m_xUriBinding = aUriBinding;
+}
+
+css::uno::Reference< css::xml::crypto::XUriBinding > SAL_CALL XMLSignatureTemplateImpl::getBinding()
+{
+    return m_xUriBinding;
+}
+
+void SAL_CALL XMLSignatureTemplateImpl::setStatus(
+    css::xml::crypto::SecurityOperationStatus status )
+{
+    m_nStatus = status;
+}
+
+css::xml::crypto::SecurityOperationStatus SAL_CALL XMLSignatureTemplateImpl::getStatus(  )
+{
+    return m_nStatus;
+}
+
+/* XServiceInfo */
+OUString SAL_CALL XMLSignatureTemplateImpl::getImplementationName() {
+    return impl_getImplementationName() ;
+}
+
+/* XServiceInfo */
+sal_Bool SAL_CALL XMLSignatureTemplateImpl::supportsService( const OUString& serviceName) {
+    return cppu::supportsService(this, serviceName);
+}
+
+/* XServiceInfo */
+Sequence< OUString > SAL_CALL XMLSignatureTemplateImpl::getSupportedServiceNames() {
+    return impl_getSupportedServiceNames() ;
+}
+
+//Helper for XServiceInfo
+Sequence< OUString > XMLSignatureTemplateImpl::impl_getSupportedServiceNames() {
+    Sequence<OUString> seqServiceNames { "com.sun.star.xml.crypto.XMLSignatureTemplate" };
+    return seqServiceNames ;
+}
+
+OUString XMLSignatureTemplateImpl::impl_getImplementationName() {
+    return "com.sun.star.xml.security.framework.XMLSignatureTemplateImpl" ;
+}
+
+//Helper for registry
+Reference< XInterface > XMLSignatureTemplateImpl::impl_createInstance( const Reference< XMultiServiceFactory >&  ) {
+    return Reference< XInterface >( *new XMLSignatureTemplateImpl ) ;
+}
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/gpg/CertificateImpl.cxx b/xmlsecurity/source/gpg/CertificateImpl.cxx
new file mode 100644
index 000000000..525706e26
--- /dev/null
+++ b/xmlsecurity/source/gpg/CertificateImpl.cxx
@@ -0,0 +1,270 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#include <config_gpgme.h>
+
+#include "CertificateImpl.hxx"
+
+#include <comphelper/servicehelper.hxx>
+#include <comphelper/sequence.hxx>
+#include <cppuhelper/supportsservice.hxx>
+
+#include <com/sun/star/security/KeyUsage.hpp>
+#include <officecfg/Office/Common.hxx>
+#include <svl/sigstruct.hxx>
+
+#include <context.h>
+#include <data.h>
+
+using namespace css;
+using namespace css::uno;
+using namespace css::security;
+using namespace css::util;
+
+CertificateImpl::CertificateImpl() :
+    m_pKey()
+{
+}
+
+CertificateImpl::~CertificateImpl()
+{
+}
+
+//Methods from XCertificateImpl
+sal_Int16 SAL_CALL CertificateImpl::getVersion()
+{
+    return 0;
+}
+
+Sequence< sal_Int8 > SAL_CALL CertificateImpl::getSerialNumber()
+{
+    // TODO: perhaps map to subkey's cardSerialNumber - if you have
+    // one to test
+    return Sequence< sal_Int8 >();
+}
+
+OUString SAL_CALL CertificateImpl::getIssuerName()
+{
+    const GpgME::UserID userId = m_pKey.userID(0);
+    if (userId.isNull())
+        return OUString();
+
+    return OStringToOUString(userId.id(), RTL_TEXTENCODING_UTF8);
+}
+
+OUString SAL_CALL CertificateImpl::getSubjectName()
+{
+    // Same as issuer name (user ID)
+    return getIssuerName();
+}
+
+namespace {
+    DateTime convertUnixTimeToDateTime(time_t time)
+    {
+        DateTime dateTime;
+        struct tm *timeStruct = gmtime(&time);
+        dateTime.Year = timeStruct->tm_year + 1900;
+        dateTime.Month = timeStruct->tm_mon + 1;
+        dateTime.Day = timeStruct->tm_mday;
+        dateTime.Hours = timeStruct->tm_hour;
+        dateTime.Minutes = timeStruct->tm_min;
+        dateTime.Seconds = timeStruct->tm_sec;
+        return dateTime;
+    }
+}
+
+DateTime SAL_CALL CertificateImpl::getNotValidBefore()
+{
+    const GpgME::Subkey subkey = m_pKey.subkey(0);
+    if (subkey.isNull())
+        return DateTime();
+
+    return convertUnixTimeToDateTime(m_pKey.subkey(0).creationTime());
+}
+
+DateTime SAL_CALL CertificateImpl::getNotValidAfter()
+{
+    const GpgME::Subkey subkey = m_pKey.subkey(0);
+    if (subkey.isNull() || subkey.neverExpires())
+        return DateTime();
+
+    return convertUnixTimeToDateTime(m_pKey.subkey(0).expirationTime());
+}
+
+Sequence< sal_Int8 > SAL_CALL CertificateImpl::getIssuerUniqueID()
+{
+    // Empty for gpg
+    return Sequence< sal_Int8 > ();
+}
+
+Sequence< sal_Int8 > SAL_CALL CertificateImpl::getSubjectUniqueID()
+{
+    // Empty for gpg
+    return Sequence< sal_Int8 > ();
+}
+
+Sequence< Reference< XCertificateExtension > > SAL_CALL CertificateImpl::getExtensions()
+{
+    // Empty for gpg
+    return Sequence< Reference< XCertificateExtension > > ();
+}
+
+Reference< XCertificateExtension > SAL_CALL CertificateImpl::findCertificateExtension( const Sequence< sal_Int8 >& /*oid*/ )
+{
+    // Empty for gpg
+    return Reference< XCertificateExtension > ();
+}
+
+Sequence< sal_Int8 > SAL_CALL CertificateImpl::getEncoded()
+{
+    // Export key to base64Empty for gpg
+    return m_aBits;
+}
+
+OUString SAL_CALL CertificateImpl::getSubjectPublicKeyAlgorithm()
+{
+    const GpgME::Subkey subkey = m_pKey.subkey(0);
+    if (subkey.isNull())
+        return OUString();
+
+    return OStringToOUString(subkey.publicKeyAlgorithmAsString(), RTL_TEXTENCODING_UTF8);
+}
+
+Sequence< sal_Int8 > SAL_CALL CertificateImpl::getSubjectPublicKeyValue()
+{
+    return Sequence< sal_Int8 > ();
+}
+
+OUString SAL_CALL CertificateImpl::getSignatureAlgorithm()
+{
+    const GpgME::UserID userId = m_pKey.userID(0);
+    if (userId.isNull())
+        return OUString();
+
+    const GpgME::UserID::Signature signature = userId.signature(0);
+    if (signature.isNull())
+        return OUString();
+
+    return OStringToOUString(signature.algorithmAsString(), RTL_TEXTENCODING_UTF8);
+}
+
+Sequence< sal_Int8 > SAL_CALL CertificateImpl::getSHA1Thumbprint()
+{
+    // This is mapped to the fingerprint for gpg
+    const char* keyId = m_pKey.primaryFingerprint();
+    return comphelper::arrayToSequence<sal_Int8>(
+        keyId, strlen(keyId)+1);
+}
+
+Sequence<sal_Int8> CertificateImpl::getSHA256Thumbprint()
+{
+    // This is mapped to the fingerprint for gpg (though that's only
+    // SHA1 actually)
+    const char* keyId = m_pKey.primaryFingerprint();
+    return comphelper::arrayToSequence<sal_Int8>(
+        keyId, strlen(keyId)+1);
+}
+
+svl::crypto::SignatureMethodAlgorithm CertificateImpl::getSignatureMethodAlgorithm()
+{
+    return svl::crypto::SignatureMethodAlgorithm::RSA;
+}
+
+Sequence< sal_Int8 > SAL_CALL CertificateImpl::getMD5Thumbprint()
+{
+    // This is mapped to the shorter keyID for gpg
+    const char* keyId = m_pKey.keyID();
+    return comphelper::arrayToSequence<sal_Int8>(
+        keyId, strlen(keyId)+1);
+}
+
+CertificateKind SAL_CALL CertificateImpl::getCertificateKind()
+{
+    return CertificateKind_OPENPGP;
+}
+
+sal_Int32 SAL_CALL CertificateImpl::getCertificateUsage()
+{
+    return KeyUsage::DIGITAL_SIGNATURE | KeyUsage::NON_REPUDIATION  | KeyUsage::KEY_ENCIPHERMENT | KeyUsage::DATA_ENCIPHERMENT;
+}
+
+/* XUnoTunnel */
+sal_Int64 SAL_CALL CertificateImpl::getSomething(const Sequence< sal_Int8 >& aIdentifier)
+{
+    if( isUnoTunnelId<CertificateImpl>(aIdentifier) ) {
+        return sal::static_int_cast<sal_Int64>(reinterpret_cast<sal_uIntPtr>(this));
+    }
+    return 0 ;
+}
+
+/* XUnoTunnel extension */
+
+namespace
+{
+    class CertificateImplUnoTunnelId : public rtl::Static< UnoTunnelIdInit, CertificateImplUnoTunnelId > {};
+}
+
+const Sequence< sal_Int8>& CertificateImpl::getUnoTunnelId() {
+    return CertificateImplUnoTunnelId::get().getSeq();
+}
+
+void CertificateImpl::setCertificate(GpgME::Context* ctx, const GpgME::Key& key)
+{
+    m_pKey = key;
+
+    // extract key data, store into m_aBits
+    GpgME::Data data_out;
+    ctx->setArmor(false); // caller will base64-encode anyway
+    GpgME::Error err = ctx->exportPublicKeys(
+        key.primaryFingerprint(),
+        data_out
+#if GPGME_CAN_EXPORT_MINIMAL_KEY
+        , officecfg::Office::Common::Security::OpenPGP::MinimalKeyExport::get()
+#endif
+    );
+
+    if (err)
+        throw RuntimeException("The GpgME library failed to retrieve the public key");
+
+    off_t result = data_out.seek(0,SEEK_SET);
+    (void) result;
+    assert(result == 0);
+    int len=0, curr=0; char buf;
+    while( (curr=data_out.read(&buf, 1)) )
+        len += curr;
+
+    // write bits to sequence of bytes
+    m_aBits.realloc(len);
+    result = data_out.seek(0,SEEK_SET);
+    assert(result == 0);
+    if( data_out.read(m_aBits.getArray(), len) != len )
+        throw RuntimeException("The GpgME library failed to read the key");
+}
+
+const GpgME::Key* CertificateImpl::getCertificate() const
+{
+    return &m_pKey;
+}
+
+/* XServiceInfo */
+OUString SAL_CALL CertificateImpl::getImplementationName()
+{
+    return "com.sun.star.xml.security.gpg.XCertificate_GpgImpl";
+}
+
+/* XServiceInfo */
+sal_Bool SAL_CALL CertificateImpl::supportsService(const OUString& serviceName)
+{
+    return cppu::supportsService(this, serviceName);
+}
+
+/* XServiceInfo */
+Sequence<OUString> SAL_CALL CertificateImpl::getSupportedServiceNames() { return { OUString() }; }
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/gpg/CertificateImpl.hxx b/xmlsecurity/source/gpg/CertificateImpl.hxx
new file mode 100644
index 000000000..cb947f0f4
--- /dev/null
+++ b/xmlsecurity/source/gpg/CertificateImpl.hxx
@@ -0,0 +1,103 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#ifndef INCLUDED_XMLSECURITY_SOURCE_GPG_X509CERTIFICATE_HXX
+#define INCLUDED_XMLSECURITY_SOURCE_GPG_X509CERTIFICATE_HXX
+
+#include <certificate.hxx>
+
+#include <sal/types.h>
+#include <sal/config.h>
+#include <rtl/ustring.hxx>
+#include <cppuhelper/implbase.hxx>
+
+#include <com/sun/star/uno/Sequence.hxx>
+#include <com/sun/star/lang/XServiceInfo.hpp>
+#include <com/sun/star/lang/XUnoTunnel.hpp>
+#include <com/sun/star/security/CertificateKind.hpp>
+#include <com/sun/star/security/XCertificate.hpp>
+
+#if defined _MSC_VER && defined __clang__
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wundef"
+#endif
+#include <key.h>
+#if defined _MSC_VER && defined __clang__
+#pragma clang diagnostic pop
+#endif
+
+class CertificateImpl : public cppu::WeakImplHelper< css::security::XCertificate,
+                                                     css::lang::XUnoTunnel,
+                                                     css::lang::XServiceInfo >,
+                        public xmlsecurity::Certificate
+{
+private:
+    GpgME::Key m_pKey;
+    css::uno::Sequence< sal_Int8 > m_aBits;
+
+public:
+    CertificateImpl();
+    virtual ~CertificateImpl() override;
+
+    //Methods from XCertificate
+    virtual sal_Int16 SAL_CALL getVersion() override;
+
+    virtual css::uno::Sequence< sal_Int8 > SAL_CALL getSerialNumber() override;
+
+    virtual OUString SAL_CALL getIssuerName() override;
+    virtual OUString SAL_CALL getSubjectName() override;
+
+    virtual css::util::DateTime SAL_CALL getNotValidBefore() override;
+    virtual css::util::DateTime SAL_CALL getNotValidAfter() override;
+
+    virtual css::uno::Sequence< sal_Int8 > SAL_CALL getIssuerUniqueID() override;
+    virtual css::uno::Sequence< sal_Int8 > SAL_CALL getSubjectUniqueID() override;
+
+    virtual css::uno::Sequence< css::uno::Reference< css::security::XCertificateExtension > > SAL_CALL getExtensions() override;
+
+    virtual css::uno::Reference< css::security::XCertificateExtension > SAL_CALL findCertificateExtension(const css::uno::Sequence< sal_Int8 >& oid) override;
+
+    virtual css::uno::Sequence< sal_Int8 > SAL_CALL getEncoded() override;
+
+    virtual OUString SAL_CALL getSubjectPublicKeyAlgorithm() override;
+
+    virtual css::uno::Sequence< sal_Int8 > SAL_CALL getSubjectPublicKeyValue() override;
+
+    virtual OUString SAL_CALL getSignatureAlgorithm() override;
+
+    virtual css::uno::Sequence< sal_Int8 > SAL_CALL getSHA1Thumbprint() override;
+
+    virtual css::uno::Sequence< sal_Int8 > SAL_CALL getMD5Thumbprint() override;
+
+    virtual sal_Int32 SAL_CALL getCertificateUsage() override;
+
+    //Methods from XUnoTunnel
+    virtual sal_Int64 SAL_CALL getSomething(const css::uno::Sequence< sal_Int8 >& aIdentifier) override;
+
+    static const css::uno::Sequence< sal_Int8 >& getUnoTunnelId();
+
+    /// @see xmlsecurity::Certificate::getSHA256Thumbprint().
+    virtual css::uno::Sequence<sal_Int8> getSHA256Thumbprint() override;
+    /// @see xmlsecurity::Certificate::getSignatureMethodAlgorithm().
+    virtual svl::crypto::SignatureMethodAlgorithm getSignatureMethodAlgorithm() override;
+    virtual css::security::CertificateKind SAL_CALL getCertificateKind() override;
+
+    // Helper methods
+    void setCertificate(GpgME::Context* ctx, const GpgME::Key& key);
+    const GpgME::Key* getCertificate() const;
+
+    // XServiceInfo
+    virtual OUString SAL_CALL getImplementationName() override;
+    virtual sal_Bool SAL_CALL supportsService(const OUString& ServiceName) override;
+    virtual css::uno::Sequence<OUString> SAL_CALL getSupportedServiceNames() override;
+} ;
+
+#endif // INCLUDED_XMLSECURITY_SOURCE_GPG_X509CERTIFICATE_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/gpg/CipherContext.cxx b/xmlsecurity/source/gpg/CipherContext.cxx
new file mode 100644
index 000000000..1b16c909d
--- /dev/null
+++ b/xmlsecurity/source/gpg/CipherContext.cxx
@@ -0,0 +1,26 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#include "CipherContext.hxx"
+
+using namespace css;
+using namespace css::uno;
+using namespace css::lang;
+
+Sequence< sal_Int8 > SAL_CALL CipherContext::convertWithCipherContext( const Sequence< sal_Int8 >& /*aData*/ )
+{
+    return Sequence<sal_Int8>();
+}
+
+uno::Sequence< sal_Int8 > SAL_CALL CipherContext::finalizeCipherContextAndDispose()
+{
+    return Sequence<sal_Int8>();
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/gpg/CipherContext.hxx b/xmlsecurity/source/gpg/CipherContext.hxx
new file mode 100644
index 000000000..4e4e04cce
--- /dev/null
+++ b/xmlsecurity/source/gpg/CipherContext.hxx
@@ -0,0 +1,29 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#ifndef INCLUDED_XMLSECURITY_SOURCE_GPG_CIPHERCONTEXT_HXX
+#define INCLUDED_XMLSECURITY_SOURCE_GPG_CIPHERCONTEXT_HXX
+
+#include <com/sun/star/xml/crypto/XCipherContext.hpp>
+
+#include <cppuhelper/implbase.hxx>
+
+class CipherContext : public cppu::WeakImplHelper< css::xml::crypto::XCipherContext >
+{
+private:
+
+public:
+    // XCipherContext
+    virtual css::uno::Sequence< ::sal_Int8 > SAL_CALL convertWithCipherContext(const css::uno::Sequence< ::sal_Int8 >& aData) override;
+    virtual css::uno::Sequence< ::sal_Int8 > SAL_CALL finalizeCipherContextAndDispose() override;
+};
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/gpg/DigestContext.cxx b/xmlsecurity/source/gpg/DigestContext.cxx
new file mode 100644
index 000000000..a1bb22ad8
--- /dev/null
+++ b/xmlsecurity/source/gpg/DigestContext.cxx
@@ -0,0 +1,27 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+
+#include "DigestContext.hxx"
+
+using namespace css;
+using namespace css::uno;
+using namespace css::lang;
+
+
+void SAL_CALL DigestContext::updateDigest(const Sequence< sal_Int8 >& /*aData*/)
+{
+}
+
+uno::Sequence< sal_Int8 > SAL_CALL DigestContext::finalizeDigestAndDispose()
+{
+    return Sequence<sal_Int8>();
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/gpg/DigestContext.hxx b/xmlsecurity/source/gpg/DigestContext.hxx
new file mode 100644
index 000000000..99fa264ef
--- /dev/null
+++ b/xmlsecurity/source/gpg/DigestContext.hxx
@@ -0,0 +1,27 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#ifndef INCLUDED_XMLSECURITY_SOURCE_GPG_DIGESTCONTEXT_HXX
+#define INCLUDED_XMLSECURITY_SOURCE_GPG_DIGESTCONTEXT_HXX
+
+#include <com/sun/star/xml/crypto/XDigestContext.hpp>
+
+#include <cppuhelper/implbase.hxx>
+
+class DigestContext : public cppu::WeakImplHelper< css::xml::crypto::XDigestContext >
+{
+public:
+    // XDigestContext
+    virtual void SAL_CALL updateDigest( const css::uno::Sequence< ::sal_Int8 >& aData ) override;
+    virtual css::uno::Sequence< ::sal_Int8 > SAL_CALL finalizeDigestAndDispose() override;
+};
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/gpg/SEInitializer.cxx b/xmlsecurity/source/gpg/SEInitializer.cxx
new file mode 100644
index 000000000..cb502e8c9
--- /dev/null
+++ b/xmlsecurity/source/gpg/SEInitializer.cxx
@@ -0,0 +1,81 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#include <cppuhelper/supportsservice.hxx>
+#include <gpg/SEInitializer.hxx>
+#include "SecurityEnvironment.hxx"
+#include "XMLSecurityContext.hxx"
+
+#include <global.h>
+
+namespace com::sun::star::uno { class XComponentContext; }
+
+using namespace css;
+using namespace css::lang;
+using namespace css::uno;
+using namespace css::xml::crypto;
+
+SEInitializerGpg::SEInitializerGpg()
+{
+    // Also init GpgME while we're at it
+    GpgME::initializeLibrary();
+}
+
+SEInitializerGpg::~SEInitializerGpg()
+{
+}
+
+/* XSEInitializer */
+Reference< XXMLSecurityContext > SAL_CALL SEInitializerGpg::createSecurityContext( const OUString& )
+{
+    try
+    {
+        /* Build XML Security Context */
+        Reference< XXMLSecurityContext > xSecCtx(new XMLSecurityContextGpg());
+
+        Reference< XSecurityEnvironment > xSecEnv(new SecurityEnvironmentGpg());
+        sal_Int32 n = xSecCtx->addSecurityEnvironment(xSecEnv);
+        //originally the SecurityEnvironment with the internal slot was set as default
+        xSecCtx->setDefaultSecurityEnvironmentIndex( n );
+        return xSecCtx;
+    }
+    catch( const uno::Exception& )
+    {
+        return nullptr;
+    }
+}
+
+void SAL_CALL SEInitializerGpg::freeSecurityContext( const uno::Reference< XXMLSecurityContext >& )
+{
+}
+
+/* XServiceInfo */
+sal_Bool SAL_CALL SEInitializerGpg::supportsService( const OUString& rServiceName )
+{
+    return cppu::supportsService(this, rServiceName);
+}
+
+uno::Sequence< OUString > SAL_CALL SEInitializerGpg::getSupportedServiceNames()
+{
+    return {"com.sun.star.xml.crypto.GPGSEInitializer"};
+}
+
+OUString SAL_CALL SEInitializerGpg::getImplementationName()
+{
+    return "com.sun.star.xml.security.SEInitializer_Gpg";
+}
+
+extern "C" SAL_DLLPUBLIC_EXPORT uno::XInterface*
+com_sun_star_xml_security_SEInitializer_Gpg_get_implementation(
+    uno::XComponentContext* /*pCtx*/, uno::Sequence<uno::Any> const& /*rSeq*/)
+{
+    return cppu::acquire(new SEInitializerGpg());
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/gpg/SecurityEnvironment.cxx b/xmlsecurity/source/gpg/SecurityEnvironment.cxx
new file mode 100644
index 000000000..290529bc8
--- /dev/null
+++ b/xmlsecurity/source/gpg/SecurityEnvironment.cxx
@@ -0,0 +1,239 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#include "SecurityEnvironment.hxx"
+#include "CertificateImpl.hxx"
+
+#include <com/sun/star/security/CertificateCharacters.hpp>
+#include <com/sun/star/security/CertificateValidity.hpp>
+
+#include <comphelper/servicehelper.hxx>
+#include <vector>
+
+#ifdef _WIN32
+#include <config_folders.h>
+#include <osl/file.hxx>
+#include <osl/process.h>
+#include <rtl/bootstrap.hxx>
+#include <tools/urlobj.hxx>
+#endif
+
+#include <key.h>
+#include <keylistresult.h>
+#include <xmlsec-wrapper.h>
+
+#if defined _MSC_VER && defined __clang__
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wundef"
+#endif
+#include <gpgme.h>
+#if defined _MSC_VER && defined __clang__
+#pragma clang diagnostic pop
+#endif
+#include <context.h>
+
+using namespace css;
+using namespace css::security;
+using namespace css::uno;
+using namespace css::lang;
+
+SecurityEnvironmentGpg::SecurityEnvironmentGpg()
+{
+#ifdef _WIN32
+    // On Windows, gpgme expects gpgme-w32spawn.exe to be in the same directory as the current
+    // process executable. This assumption might be wrong, e.g., for bundled python, which is
+    // in instdir/program/python-core-x.y.z/bin, while gpgme-w32spawn.exe is in instdir/program.
+    // If we can't find gpgme-w32spawn.exe in the current executable location, then try to find
+    // the spawn executable, and inform gpgme about actual location using gpgme_set_global_flag.
+    [[maybe_unused]] static bool bSpawnPathInitialized = [] {
+        auto accessUrl = [](const INetURLObject& url) {
+            osl::File file(url.GetMainURL(INetURLObject::DecodeMechanism::NONE));
+            return file.open(osl_File_OpenFlag_Read) == osl::FileBase::E_None;
+        };
+        OUString sPath;
+        osl_getExecutableFile(&sPath.pData);
+        INetURLObject aPathUrl(sPath);
+        aPathUrl.setName("gpgme-w32spawn.exe");
+        if (!accessUrl(aPathUrl))
+        {
+            sPath = "$BRAND_BASE_DIR/" LIBO_LIBEXEC_FOLDER "/gpgme-w32spawn.exe";
+            rtl::Bootstrap::expandMacros(sPath);
+            aPathUrl.SetURL(sPath);
+            if (accessUrl(aPathUrl))
+            {
+                aPathUrl.removeSegment();
+                GpgME::setGlobalFlag("w32-inst-dir",
+                                     aPathUrl.getFSysPath(FSysStyle::Dos).toUtf8().getStr());
+            }
+        }
+        return true;
+    }();
+#endif
+    GpgME::Error err = GpgME::checkEngine(GpgME::OpenPGP);
+    if (err)
+        throw RuntimeException("The GpgME library failed to initialize for the OpenPGP protocol.");
+
+    m_ctx.reset( GpgME::Context::createForProtocol(GpgME::OpenPGP) );
+    if (m_ctx == nullptr)
+        throw RuntimeException("The GpgME library failed to initialize for the OpenPGP protocol.");
+    m_ctx->setArmor(false);
+}
+
+SecurityEnvironmentGpg::~SecurityEnvironmentGpg()
+{
+}
+
+/* XUnoTunnel */
+sal_Int64 SAL_CALL SecurityEnvironmentGpg::getSomething( const Sequence< sal_Int8 >& aIdentifier )
+{
+    if( isUnoTunnelId<SecurityEnvironmentGpg>(aIdentifier) ) {
+        return sal::static_int_cast<sal_Int64>(reinterpret_cast<sal_uIntPtr>(this));
+    }
+    return 0 ;
+}
+
+/* XUnoTunnel extension */
+
+namespace
+{
+    class theSecurityEnvironmentUnoTunnelId  : public rtl::Static< UnoTunnelIdInit, theSecurityEnvironmentUnoTunnelId > {};
+}
+
+const Sequence< sal_Int8>& SecurityEnvironmentGpg::getUnoTunnelId() {
+    return theSecurityEnvironmentUnoTunnelId::get().getSeq();
+}
+
+OUString SecurityEnvironmentGpg::getSecurityEnvironmentInformation()
+{
+    return OUString();
+}
+
+Sequence< Reference < XCertificate > > SecurityEnvironmentGpg::getCertificatesImpl( bool bPrivateOnly )
+{
+    CertificateImpl* xCert;
+    std::vector< GpgME::Key > keyList;
+    std::vector< CertificateImpl* > certsList;
+
+    m_ctx->setKeyListMode(GPGME_KEYLIST_MODE_LOCAL);
+    GpgME::Error err = m_ctx->startKeyListing("", bPrivateOnly );
+    while (!err) {
+        GpgME::Key k = m_ctx->nextKey(err);
+        if (err)
+            break;
+        if (!k.isRevoked() && !k.isExpired() && !k.isDisabled() && !k.isInvalid()) {
+            // We can't create CertificateImpl here as CertificateImpl::setCertificate uses GpgME API
+            // which interrupts our key listing here. So first get the keys from GpgME, then create the CertificateImpls
+            keyList.push_back(k);
+        }
+    }
+    m_ctx->endKeyListing();
+
+    for (auto const& key : keyList) {
+        xCert = new CertificateImpl();
+        xCert->setCertificate(m_ctx.get(),key);
+        certsList.push_back(xCert);
+    }
+
+    Sequence< Reference< XCertificate > > xCertificateSequence(certsList.size());
+    int i = 0;
+    for (auto const& cert : certsList) {
+        xCertificateSequence[i++] = cert;
+    }
+
+    return xCertificateSequence;
+}
+
+Sequence< Reference < XCertificate > > SecurityEnvironmentGpg::getPersonalCertificates()
+{
+    return getCertificatesImpl( true );
+}
+
+Sequence< Reference < XCertificate > > SecurityEnvironmentGpg::getAllCertificates()
+{
+    return getCertificatesImpl( false );
+}
+
+Reference< XCertificate > SecurityEnvironmentGpg::getCertificate( const OUString& keyId, const Sequence< sal_Int8 >& /*serialNumber*/ )
+{
+    CertificateImpl* xCert=nullptr;
+
+    //xmlChar* pSignatureValue=xmlNodeGetContent(cur);
+    OString ostr = OUStringToOString( keyId , RTL_TEXTENCODING_UTF8 );
+    const xmlChar* strKeyId = reinterpret_cast<const xmlChar*>(ostr.getStr());
+    if(xmlSecBase64Decode(strKeyId, const_cast<xmlSecByte*>(strKeyId), xmlStrlen(strKeyId)) < 0)
+        throw RuntimeException("Base64 decode failed");
+
+    m_ctx->setKeyListMode(GPGME_KEYLIST_MODE_LOCAL);
+    GpgME::Error err = m_ctx->startKeyListing("", false);
+    while (!err) {
+        GpgME::Key k = m_ctx->nextKey(err);
+        if (err)
+            break;
+        if (!k.isInvalid() && strcmp(k.primaryFingerprint(), reinterpret_cast<const char*>(strKeyId)) == 0) {
+            xCert = new CertificateImpl();
+            xCert->setCertificate(m_ctx.get(), k);
+            m_ctx->endKeyListing();
+            return xCert;
+        }
+    }
+    m_ctx->endKeyListing();
+
+    return nullptr;
+}
+
+Sequence< Reference < XCertificate > > SecurityEnvironmentGpg::buildCertificatePath( const Reference< XCertificate >& /*begin*/ )
+{
+    return Sequence< Reference < XCertificate > >();
+}
+
+Reference< XCertificate > SecurityEnvironmentGpg::createCertificateFromRaw( const Sequence< sal_Int8 >& /*rawCertificate*/ )
+{
+    return nullptr;
+}
+
+Reference< XCertificate > SecurityEnvironmentGpg::createCertificateFromAscii( const OUString& /*asciiCertificate*/ )
+{
+    return nullptr;
+}
+
+sal_Int32 SecurityEnvironmentGpg::verifyCertificate( const Reference< XCertificate >& aCert,
+                                                  const Sequence< Reference< XCertificate > >&  /*intermediateCerts*/ )
+{
+    const CertificateImpl* xCert = dynamic_cast<CertificateImpl*>(aCert.get());
+    if (xCert == nullptr) {
+         // Can't find the key locally -> unknown owner
+        return security::CertificateValidity::ISSUER_UNKNOWN;
+    }
+
+    const GpgME::Key* key = xCert->getCertificate();
+    if (key->ownerTrust() == GpgME::Key::OwnerTrust::Marginal ||
+        key->ownerTrust() == GpgME::Key::OwnerTrust::Full ||
+        key->ownerTrust() == GpgME::Key::OwnerTrust::Ultimate)
+    {
+        return security::CertificateValidity::VALID;
+    }
+
+    return security::CertificateValidity::ISSUER_UNTRUSTED;
+}
+
+sal_Int32 SecurityEnvironmentGpg::getCertificateCharacters(
+    const Reference< XCertificate >& aCert)
+{
+    const CertificateImpl* xCert;
+    Reference< XUnoTunnel > xCertTunnel(aCert, UNO_QUERY_THROW) ;
+    xCert = reinterpret_cast<CertificateImpl*>(sal::static_int_cast<sal_uIntPtr>(xCertTunnel->getSomething(CertificateImpl::getUnoTunnelId()))) ;
+    if (xCert == nullptr)
+        throw RuntimeException();
+
+    // we only listed private keys anyway, up in
+    // SecurityEnvironmentGpg::getPersonalCertificates
+    return CertificateCharacters::HAS_PRIVATE_KEY;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/gpg/SecurityEnvironment.hxx b/xmlsecurity/source/gpg/SecurityEnvironment.hxx
new file mode 100644
index 000000000..c815e0e1f
--- /dev/null
+++ b/xmlsecurity/source/gpg/SecurityEnvironment.hxx
@@ -0,0 +1,72 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#ifndef INCLUDED_XMLSECURITY_SOURCE_GPG_SECURITYENVIRONMENT_HXX
+#define INCLUDED_XMLSECURITY_SOURCE_GPG_SECURITYENVIRONMENT_HXX
+
+#include <sal/config.h>
+#include <rtl/ustring.hxx>
+#include <cppuhelper/implbase.hxx>
+
+#include <com/sun/star/uno/Reference.hxx>
+#include <com/sun/star/xml/crypto/XSecurityEnvironment.hpp>
+#include <com/sun/star/lang/XUnoTunnel.hpp>
+
+namespace com::sun::star::security { class XCertificate; }
+namespace GpgME { class Context; }
+
+class SecurityEnvironmentGpg : public cppu::WeakImplHelper< css::xml::crypto::XSecurityEnvironment,
+                                                            css::lang::XUnoTunnel >
+{
+    std::unique_ptr<GpgME::Context> m_ctx;
+
+public:
+    SecurityEnvironmentGpg();
+    virtual ~SecurityEnvironmentGpg() override;
+
+    //Methods from XSecurityEnvironment
+    virtual ::sal_Int32 SAL_CALL verifyCertificate(
+        const css::uno::Reference<
+        css::security::XCertificate >& xCert,
+        const css::uno::Sequence<
+        css::uno::Reference< css::security::XCertificate > > &
+        intermediateCerts) override;
+
+    virtual ::sal_Int32 SAL_CALL getCertificateCharacters( const css::uno::Reference< css::security::XCertificate >& xCert ) override;
+
+    virtual OUString SAL_CALL getSecurityEnvironmentInformation() override;
+
+    //Methods from XUnoTunnel
+    virtual sal_Int64 SAL_CALL getSomething( const css::uno::Sequence< sal_Int8 >& aIdentifier ) override;
+
+    static const css::uno::Sequence< sal_Int8 >& getUnoTunnelId() ;
+
+    virtual css::uno::Sequence< css::uno::Reference< css::security::XCertificate > > SAL_CALL getPersonalCertificates() override;
+
+    /** We reinterpret the first parameter (originally issuerName) as keyId. We have no other way to identify a gpg key. */
+    virtual css::uno::Reference< css::security::XCertificate > SAL_CALL getCertificate( const OUString& keyId, const css::uno::Sequence< sal_Int8 >& serialNumber ) override;
+
+    virtual css::uno::Sequence< css::uno::Reference< css::security::XCertificate > > SAL_CALL buildCertificatePath(
+        const css::uno::Reference< css::security::XCertificate >& beginCert ) override;
+
+    virtual css::uno::Reference< css::security::XCertificate > SAL_CALL createCertificateFromRaw(
+        const css::uno::Sequence< sal_Int8 >& rawCertificate ) override;
+    virtual css::uno::Reference< css::security::XCertificate > SAL_CALL createCertificateFromAscii(
+        const OUString& asciiCertificate ) override;
+
+    GpgME::Context& getGpgContext() { return *m_ctx; }
+    virtual css::uno::Sequence< css::uno::Reference< css::security::XCertificate > > SAL_CALL getAllCertificates() override;
+
+private:
+    css::uno::Sequence< css::uno::Reference< css::security::XCertificate > > getCertificatesImpl( bool bPrivateOnly );
+} ;
+
+#endif // INCLUDED_XMLSECURITY_SOURCE_GPG_SECURITYENVIRONMENT_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/gpg/XMLEncryption.cxx b/xmlsecurity/source/gpg/XMLEncryption.cxx
new file mode 100644
index 000000000..65083ff68
--- /dev/null
+++ b/xmlsecurity/source/gpg/XMLEncryption.cxx
@@ -0,0 +1,37 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#include "XMLEncryption.hxx"
+
+using namespace css::uno;
+using namespace css::lang;
+using namespace css::xml::wrapper;
+using namespace css::xml::crypto;
+
+XMLEncryptionGpg::XMLEncryptionGpg() {
+}
+
+XMLEncryptionGpg::~XMLEncryptionGpg() {
+}
+
+/* XXMLEncryption */
+Reference< XXMLEncryptionTemplate > SAL_CALL XMLEncryptionGpg::encrypt(const Reference< XXMLEncryptionTemplate >& /*aTemplate*/,
+                                                                    const Reference< XSecurityEnvironment >& /*aEnvironment*/)
+{
+    return nullptr;
+}
+
+/* XXMLEncryption */
+Reference< XXMLEncryptionTemplate > SAL_CALL XMLEncryptionGpg::decrypt(const Reference< XXMLEncryptionTemplate >& /*aTemplate*/,
+                                                                    const Reference< XXMLSecurityContext >& /*aSecurityCtx*/)
+{
+    return nullptr;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/gpg/XMLEncryption.hxx b/xmlsecurity/source/gpg/XMLEncryption.hxx
new file mode 100644
index 000000000..168128b40
--- /dev/null
+++ b/xmlsecurity/source/gpg/XMLEncryption.hxx
@@ -0,0 +1,40 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#ifndef INCLUDED_XMLSECURITY_SOURCE_GPG_XMLENCRYPTION_HXX
+#define INCLUDED_XMLSECURITY_SOURCE_GPG_XMLENCRYPTION_HXX
+
+#include <sal/config.h>
+#include <cppuhelper/implbase.hxx>
+
+#include <com/sun/star/uno/Reference.hxx>
+#include <com/sun/star/xml/crypto/XXMLEncryption.hpp>
+
+namespace com::sun::star::xml::crypto { class XXMLEncryptionTemplate; }
+namespace com::sun::star::xml::crypto { class XXMLSecurityContext; }
+
+class XMLEncryptionGpg : public cppu::WeakImplHelper< css::xml::crypto::XXMLEncryption >
+{
+public:
+    explicit XMLEncryptionGpg();
+    virtual ~XMLEncryptionGpg() override;
+
+    // XXMLEncryption
+    virtual css::uno::Reference< css::xml::crypto::XXMLEncryptionTemplate > SAL_CALL encrypt(
+        const css::uno::Reference< css::xml::crypto::XXMLEncryptionTemplate >& aTemplate,
+        const css::uno::Reference< css::xml::crypto::XSecurityEnvironment >& aEnvironment) override;
+
+    virtual css::uno::Reference< css::xml::crypto::XXMLEncryptionTemplate > SAL_CALL decrypt(
+        const css::uno::Reference< css::xml::crypto::XXMLEncryptionTemplate >& aTemplate,
+        const css::uno::Reference< css::xml::crypto::XXMLSecurityContext >& aContext) override;
+};
+
+#endif // INCLUDED_XMLSECURITY_SOURCE_GPG_XMLENCRYPTION_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/gpg/XMLSecurityContext.cxx b/xmlsecurity/source/gpg/XMLSecurityContext.cxx
new file mode 100644
index 000000000..d27e55282
--- /dev/null
+++ b/xmlsecurity/source/gpg/XMLSecurityContext.cxx
@@ -0,0 +1,84 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#include "XMLSecurityContext.hxx"
+
+#include <cppuhelper/supportsservice.hxx>
+
+using namespace css::uno;
+using namespace css::lang;
+using namespace css::xml::crypto;
+
+XMLSecurityContextGpg::XMLSecurityContextGpg()
+    : m_nDefaultEnvIndex(-1)
+{
+}
+
+XMLSecurityContextGpg::~XMLSecurityContextGpg()
+{
+}
+
+sal_Int32 SAL_CALL XMLSecurityContextGpg::addSecurityEnvironment(
+    const Reference< XSecurityEnvironment >& aSecurityEnvironment)
+{
+    if(!aSecurityEnvironment.is())
+        throw RuntimeException("Invalid SecurityEnvironment given!");
+
+    m_vSecurityEnvironments.push_back(aSecurityEnvironment);
+    return m_vSecurityEnvironments.size() - 1 ;
+}
+
+
+sal_Int32 SAL_CALL XMLSecurityContextGpg::getSecurityEnvironmentNumber()
+{
+    return m_vSecurityEnvironments.size();
+}
+
+Reference< XSecurityEnvironment > SAL_CALL XMLSecurityContextGpg::getSecurityEnvironmentByIndex(sal_Int32 index)
+{
+    if (index < 0 || index >= static_cast<sal_Int32>(m_vSecurityEnvironments.size()))
+        throw RuntimeException("Invalid index");
+
+    return m_vSecurityEnvironments[index];
+}
+
+Reference< XSecurityEnvironment > SAL_CALL XMLSecurityContextGpg::getSecurityEnvironment()
+{
+    if (m_nDefaultEnvIndex < 0 || m_nDefaultEnvIndex >= static_cast<sal_Int32>(m_vSecurityEnvironments.size()))
+        throw RuntimeException("Invalid index");
+
+    return getSecurityEnvironmentByIndex(m_nDefaultEnvIndex);
+}
+
+sal_Int32 SAL_CALL XMLSecurityContextGpg::getDefaultSecurityEnvironmentIndex()
+{
+    return m_nDefaultEnvIndex ;
+}
+
+void SAL_CALL XMLSecurityContextGpg::setDefaultSecurityEnvironmentIndex(sal_Int32 nDefaultEnvIndex)
+{
+    m_nDefaultEnvIndex = nDefaultEnvIndex;
+}
+
+/* XServiceInfo */
+OUString SAL_CALL XMLSecurityContextGpg::getImplementationName() {
+    return "com.sun.star.xml.security.gpg.XMLSecurityContext_GpgImpl";
+}
+
+/* XServiceInfo */
+sal_Bool SAL_CALL XMLSecurityContextGpg::supportsService( const OUString& serviceName) {
+    return cppu::supportsService(this, serviceName);
+}
+
+/* XServiceInfo */
+Sequence< OUString > SAL_CALL XMLSecurityContextGpg::getSupportedServiceNames() {
+    return { OUString("com.sun.star.xml.crypto.XMLSecurityContext") };
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/gpg/XMLSecurityContext.hxx b/xmlsecurity/source/gpg/XMLSecurityContext.hxx
new file mode 100644
index 000000000..3ca399f2b
--- /dev/null
+++ b/xmlsecurity/source/gpg/XMLSecurityContext.hxx
@@ -0,0 +1,61 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#ifndef INCLUDED_XMLSECURITY_SOURCE_GPG_XMLSECURITYCONTEXT_HXX
+#define INCLUDED_XMLSECURITY_SOURCE_GPG_XMLSECURITYCONTEXT_HXX
+
+#include <sal/config.h>
+#include <rtl/ustring.hxx>
+#include <cppuhelper/implbase.hxx>
+
+#include <com/sun/star/uno/Reference.hxx>
+#include <com/sun/star/lang/XServiceInfo.hpp>
+#include <com/sun/star/xml/crypto/XXMLSecurityContext.hpp>
+
+#include <vector>
+
+namespace com::sun::star::xml::crypto { class XSecurityEnvironment; }
+
+class XMLSecurityContextGpg : public cppu::WeakImplHelper< css::xml::crypto::XXMLSecurityContext,
+                                                           css::lang::XServiceInfo>
+{
+private:
+    std::vector< css::uno::Reference< css::xml::crypto::XSecurityEnvironment > > m_vSecurityEnvironments;
+
+    sal_Int32 m_nDefaultEnvIndex;
+
+public:
+    XMLSecurityContextGpg();
+    virtual ~XMLSecurityContextGpg() override;
+
+    // XXMLSecurityContext
+    virtual sal_Int32 SAL_CALL addSecurityEnvironment(
+        const css::uno::Reference< css::xml::crypto::XSecurityEnvironment >& aSecurityEnvironment) override;
+
+    virtual ::sal_Int32 SAL_CALL getSecurityEnvironmentNumber() override;
+
+    virtual css::uno::Reference<css::xml::crypto::XSecurityEnvironment > SAL_CALL getSecurityEnvironmentByIndex(sal_Int32 index) override;
+
+    virtual css::uno::Reference<css::xml::crypto::XSecurityEnvironment > SAL_CALL getSecurityEnvironment() override;
+
+    virtual sal_Int32 SAL_CALL getDefaultSecurityEnvironmentIndex() override;
+
+    virtual void SAL_CALL setDefaultSecurityEnvironmentIndex( sal_Int32 nDefaultEnvIndex ) override;
+
+    // XServiceInfo
+    virtual OUString SAL_CALL getImplementationName() override ;
+
+    virtual sal_Bool SAL_CALL supportsService(const OUString& ServiceName) override ;
+
+    virtual css::uno::Sequence< OUString > SAL_CALL getSupportedServiceNames() override ;
+} ;
+
+#endif // INCLUDED_XMLSECURITY_SOURCE_GPG_XMLSECURITYCONTEXT_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/gpg/xmlsignature_gpgimpl.cxx b/xmlsecurity/source/gpg/xmlsignature_gpgimpl.cxx
new file mode 100644
index 000000000..3b4e138ae
--- /dev/null
+++ b/xmlsecurity/source/gpg/xmlsignature_gpgimpl.cxx
@@ -0,0 +1,527 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <sal/config.h>
+#include <sal/log.hxx>
+#include <xmlsec-wrapper.h>
+#include <cppuhelper/supportsservice.hxx>
+#include <gpg/xmlsignature_gpgimpl.hxx>
+
+#if defined _MSC_VER && defined __clang__
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wundef"
+#endif
+#include <gpgme.h>
+#if defined _MSC_VER && defined __clang__
+#pragma clang diagnostic pop
+#endif
+#include <context.h>
+#include <key.h>
+#include <data.h>
+#include <signingresult.h>
+#include <importresult.h>
+
+#include <xmlelementwrapper_xmlsecimpl.hxx>
+#include <xmlsec/xmlstreamio.hxx>
+#include <xmlsec/errorcallback.hxx>
+
+#include "SecurityEnvironment.hxx"
+
+using namespace css::uno;
+using namespace css::lang;
+using namespace css::xml::wrapper;
+using namespace css::xml::crypto;
+
+XMLSignature_GpgImpl::XMLSignature_GpgImpl() {
+}
+
+XMLSignature_GpgImpl::~XMLSignature_GpgImpl() {
+}
+
+/* XXMLSignature */
+Reference< XXMLSignatureTemplate >
+SAL_CALL XMLSignature_GpgImpl::generate(
+    const Reference< XXMLSignatureTemplate >& aTemplate ,
+    const Reference< XSecurityEnvironment >& aEnvironment
+)
+{
+    xmlSecDSigCtxPtr pDsigCtx = nullptr ;
+    xmlNodePtr pNode = nullptr ;
+
+    if( !aTemplate.is() )
+        throw RuntimeException() ;
+
+    if( !aEnvironment.is() )
+        throw RuntimeException() ;
+
+    //Get the xml node
+    Reference< XXMLElementWrapper > xElement = aTemplate->getTemplate() ;
+    if( !xElement.is() ) {
+        throw RuntimeException() ;
+    }
+
+    XMLElementWrapper_XmlSecImpl* pElement =
+        dynamic_cast<XMLElementWrapper_XmlSecImpl*>(xElement.get());
+    if( pElement == nullptr ) {
+        throw RuntimeException() ;
+    }
+
+    pNode = pElement->getNativeElement() ;
+
+    //Get the stream/URI binding
+    Reference< XUriBinding > xUriBinding = aTemplate->getBinding() ;
+    if( xUriBinding.is() ) {
+        //Register the stream input callbacks into libxml2
+        if( xmlRegisterStreamInputCallbacks( xUriBinding ) < 0 )
+            throw RuntimeException() ;
+    }
+
+    //Get Keys Manager
+    SecurityEnvironmentGpg* pSecEnv =
+        dynamic_cast<SecurityEnvironmentGpg*>(aEnvironment.get());
+    if( pSecEnv == nullptr )
+        throw RuntimeException() ;
+
+    setErrorRecorder();
+
+    //Create Signature context
+    pDsigCtx = xmlSecDSigCtxCreate( nullptr ) ;
+    if( pDsigCtx == nullptr )
+    {
+        clearErrorRecorder();
+        return aTemplate;
+    }
+
+    // set intended operation to sign - several asserts inside libxmlsec
+    // wanting that for digest / transforms
+    pDsigCtx->operation = xmlSecTransformOperationSign;
+
+    // we default to SHA512 for all digests - nss crypto does not have it...
+    //pDsigCtx->defDigestMethodId = xmlSecTransformSha512Id;
+
+    // Calculate digest for all references
+    xmlNodePtr cur = xmlSecGetNextElementNode(pNode->children);
+    if( cur != nullptr )
+        cur = xmlSecGetNextElementNode(cur->children);
+    while( cur != nullptr )
+    {
+        // some of those children I suppose should be reference elements
+        if( xmlSecCheckNodeName(cur, xmlSecNodeReference, xmlSecDSigNs) )
+        {
+            xmlSecDSigReferenceCtxPtr pDsigRefCtx =
+                xmlSecDSigReferenceCtxCreate(pDsigCtx,
+                                             xmlSecDSigReferenceOriginSignedInfo);
+            if(pDsigRefCtx == nullptr)
+                throw RuntimeException();
+
+            // add this one to the list
+            if( xmlSecPtrListAdd(&(pDsigCtx->signedInfoReferences),
+                                 pDsigRefCtx) < 0 )
+            {
+                // TODO resource handling
+                xmlSecDSigReferenceCtxDestroy(pDsigRefCtx);
+                throw RuntimeException();
+            }
+
+            if( xmlSecDSigReferenceCtxProcessNode(pDsigRefCtx, cur) < 0 )
+                throw RuntimeException();
+
+            // final check - all good?
+            if(pDsigRefCtx->status != xmlSecDSigStatusSucceeded)
+            {
+                pDsigCtx->status = xmlSecDSigStatusInvalid;
+                return aTemplate; // TODO - harder error?
+            }
+        }
+
+        cur = xmlSecGetNextElementNode(cur->next);
+    }
+
+    // get me a digestible buffer from the signature template!
+    // -------------------------------------------------------
+
+    // run the transformations over SignedInfo element (first child of
+    // pNode)
+    xmlSecNodeSetPtr nodeset = nullptr;
+    cur = xmlSecGetNextElementNode(pNode->children);
+    // TODO assert that...
+    nodeset = xmlSecNodeSetGetChildren(pNode->doc, cur, 1, 0);
+    if(nodeset == nullptr)
+        throw RuntimeException("The GpgME library failed to initialize for the OpenPGP protocol.");
+
+    if( xmlSecTransformCtxXmlExecute(&(pDsigCtx->transformCtx), nodeset) < 0 )
+        throw RuntimeException("The GpgME library failed to initialize for the OpenPGP protocol.");
+
+    // now extract the keyid from PGPData
+    // walk xml tree to PGPData node - go to children, first is
+    // SignedInfo, 2nd is signaturevalue, 3rd is KeyInfo
+    // 1st child is PGPData, 1st grandchild is PGPKeyID
+    cur = xmlSecGetNextElementNode(pNode->children);
+    // TODO error handling
+    cur = xmlSecGetNextElementNode(cur->next);
+    cur = xmlSecGetNextElementNode(cur->next);
+    cur = xmlSecGetNextElementNode(cur->children);
+    // check that this is now PGPData
+    if(!xmlSecCheckNodeName(cur, xmlSecNodePGPData, xmlSecDSigNs))
+        throw RuntimeException("The GpgME library failed to initialize for the OpenPGP protocol.");
+    // check that this is now PGPKeyID
+    cur = xmlSecGetNextElementNode(cur->children);
+    static const xmlChar xmlSecNodePGPKeyID[] = "PGPKeyID";
+    if(!xmlSecCheckNodeName(cur, xmlSecNodePGPKeyID, xmlSecDSigNs))
+        throw RuntimeException("The GpgME library failed to initialize for the OpenPGP protocol.");
+
+    GpgME::Context& rCtx=pSecEnv->getGpgContext();
+    rCtx.setKeyListMode(GPGME_KEYLIST_MODE_LOCAL);
+    GpgME::Error err;
+    xmlChar* pKey=xmlNodeGetContent(cur);
+    if(xmlSecBase64Decode(pKey, reinterpret_cast<xmlSecByte*>(pKey), xmlStrlen(pKey)) < 0)
+        throw RuntimeException("The GpgME library failed to initialize for the OpenPGP protocol.");
+    if( rCtx.addSigningKey(
+            rCtx.key(
+                reinterpret_cast<char*>(pKey), err, true)) )
+        throw RuntimeException("The GpgME library failed to initialize for the OpenPGP protocol.");
+
+    xmlFree(pKey);
+
+    // good, ctx is setup now, let's sign the lot
+    GpgME::Data data_in(
+        reinterpret_cast<char*>(xmlSecBufferGetData(pDsigCtx->transformCtx.result)),
+        xmlSecBufferGetSize(pDsigCtx->transformCtx.result), false);
+    GpgME::Data data_out;
+
+    SAL_INFO("xmlsecurity.xmlsec.gpg", "Generating signature for: " << xmlSecBufferGetData(pDsigCtx->transformCtx.result));
+
+    // we base64-encode anyway
+    rCtx.setArmor(false);
+    GpgME::SigningResult sign_res=rCtx.sign(data_in, data_out,
+                                            GpgME::Detached);
+    off_t result = data_out.seek(0,SEEK_SET);
+    (void) result;
+    assert(result == 0);
+    int len=0, curr=0; char buf;
+    while( (curr=data_out.read(&buf, 1)) )
+        len += curr;
+
+    if(sign_res.error() || !len)
+        throw RuntimeException("The GpgME library failed to initialize for the OpenPGP protocol.");
+
+    // write signed data to xml
+    xmlChar* signature = static_cast<xmlChar*>(xmlMalloc(len + 1));
+    if(signature == nullptr)
+        throw RuntimeException("The GpgME library failed to initialize for the OpenPGP protocol.");
+    result = data_out.seek(0,SEEK_SET);
+    assert(result == 0);
+    if( data_out.read(signature, len) != len )
+        throw RuntimeException("The GpgME library failed to initialize for the OpenPGP protocol.");
+
+    // conversion to base64
+    xmlChar* signatureEncoded=nullptr;
+    if( !(signatureEncoded=xmlSecBase64Encode(reinterpret_cast<xmlSecByte*>(signature), len, 79)) )
+        throw RuntimeException("The GpgME library failed to initialize for the OpenPGP protocol.");
+    xmlFree(signature);
+
+    // walk xml tree to sign value node - go to children, first is
+    // SignedInfo, 2nd is signaturevalue
+    cur = xmlSecGetNextElementNode(pNode->children);
+    cur = xmlSecGetNextElementNode(cur->next);
+
+    // TODO some assert would be good...
+    xmlNodeSetContentLen(cur, signatureEncoded, xmlStrlen(signatureEncoded));
+    xmlFree(signatureEncoded);
+
+    aTemplate->setStatus(SecurityOperationStatus_OPERATION_SUCCEEDED);
+
+    // done
+    xmlSecDSigCtxDestroy( pDsigCtx ) ;
+
+    //Unregistered the stream/URI binding
+    if( xUriBinding.is() )
+        xmlUnregisterStreamInputCallbacks() ;
+
+    clearErrorRecorder();
+    return aTemplate ;
+}
+
+/* XXMLSignature */
+Reference< XXMLSignatureTemplate >
+SAL_CALL XMLSignature_GpgImpl::validate(
+    const Reference< XXMLSignatureTemplate >& aTemplate ,
+    const Reference< XXMLSecurityContext >& aSecurityCtx
+) {
+    xmlSecDSigCtxPtr pDsigCtx = nullptr ;
+    xmlNodePtr pNode = nullptr ;
+
+    if( !aTemplate.is() )
+        throw RuntimeException() ;
+
+    if( !aSecurityCtx.is() )
+        throw RuntimeException() ;
+
+    //Get the xml node
+    Reference< XXMLElementWrapper > xElement = aTemplate->getTemplate() ;
+    if( !xElement.is() )
+        throw RuntimeException() ;
+
+    XMLElementWrapper_XmlSecImpl* pElement =
+        dynamic_cast<XMLElementWrapper_XmlSecImpl*>(xElement.get());
+    if( pElement == nullptr )
+        throw RuntimeException() ;
+
+    pNode = pElement->getNativeElement() ;
+
+    //Get the stream/URI binding
+    Reference< XUriBinding > xUriBinding = aTemplate->getBinding() ;
+    if( xUriBinding.is() ) {
+        //Register the stream input callbacks into libxml2
+        if( xmlRegisterStreamInputCallbacks( xUriBinding ) < 0 )
+            throw RuntimeException() ;
+    }
+
+    setErrorRecorder();
+
+    sal_Int32 nSecurityEnvironment = aSecurityCtx->getSecurityEnvironmentNumber();
+    sal_Int32 i;
+
+    for (i=0; i<nSecurityEnvironment; ++i)
+    {
+        Reference< XSecurityEnvironment > aEnvironment = aSecurityCtx->getSecurityEnvironmentByIndex(i);
+
+        SecurityEnvironmentGpg* pSecEnv =
+            dynamic_cast<SecurityEnvironmentGpg*>(aEnvironment.get());
+        if( pSecEnv == nullptr )
+            throw RuntimeException() ;
+
+        // TODO figure out key from pSecEnv!
+        // unclear how/where that is transported in nss impl...
+
+        //Create Signature context
+        pDsigCtx = xmlSecDSigCtxCreate( nullptr ) ;
+        if( pDsigCtx == nullptr )
+        {
+            clearErrorRecorder();
+            return aTemplate;
+        }
+
+        // set intended operation to verify - several asserts inside libxmlsec
+        // wanting that for digest / transforms
+        pDsigCtx->operation = xmlSecTransformOperationVerify;
+
+        // reset status - to be set later
+        pDsigCtx->status = xmlSecDSigStatusUnknown;
+
+        // get me a digestible buffer from the SignatureInfo node!
+        // -------------------------------------------------------
+
+        // run the transformations - first child node is required to
+        // be SignatureInfo
+        xmlSecNodeSetPtr nodeset = nullptr;
+        xmlNodePtr cur = xmlSecGetNextElementNode(pNode->children);
+        // TODO assert that...
+        nodeset = xmlSecNodeSetGetChildren(pNode->doc, cur, 1, 0);
+        if(nodeset == nullptr)
+            throw RuntimeException("The GpgME library failed to initialize for the OpenPGP protocol.");
+
+        // TODO assert we really have the SignatureInfo here?
+        if( xmlSecTransformCtxXmlExecute(&(pDsigCtx->transformCtx), nodeset) < 0 )
+            throw RuntimeException("The GpgME library failed to initialize for the OpenPGP protocol.");
+
+        // Validate the template via gpgme
+        GpgME::Context& rCtx=pSecEnv->getGpgContext();
+
+        GpgME::Data data_text(
+            reinterpret_cast<char*>(xmlSecBufferGetData(pDsigCtx->transformCtx.result)),
+            xmlSecBufferGetSize(pDsigCtx->transformCtx.result), false);
+
+        SAL_INFO("xmlsecurity.xmlsec.gpg", "Validating SignatureInfo: " << xmlSecBufferGetData(pDsigCtx->transformCtx.result));
+
+        // walk xml tree to sign value node - go to children, first is
+        // SignedInfo, 2nd is signaturevalue
+        cur = xmlSecGetNextElementNode(pNode->children);
+        cur = xmlSecGetNextElementNode(cur->next);
+
+        if(!xmlSecCheckNodeName(cur, xmlSecNodeSignatureValue, xmlSecDSigNs))
+            throw RuntimeException("The GpgME library failed to initialize for the OpenPGP protocol.");
+        xmlChar* pSignatureValue=xmlNodeGetContent(cur);
+        int nSigSize = xmlSecBase64Decode(pSignatureValue, reinterpret_cast<xmlSecByte*>(pSignatureValue), xmlStrlen(pSignatureValue));
+        if( nSigSize < 0)
+            throw RuntimeException("The GpgME library failed to initialize for the OpenPGP protocol.");
+
+        GpgME::Data data_signature(
+            reinterpret_cast<char*>(pSignatureValue),
+            nSigSize, false);
+
+        GpgME::VerificationResult verify_res=rCtx.verifyDetachedSignature(
+            data_signature, data_text);
+
+        // TODO: needs some more error handling, needs checking _all_ signatures
+        if( verify_res.isNull() || verify_res.numSignatures() == 0
+            // there is at least 1 signature and it is anything else than fully valid
+            || ( (verify_res.numSignatures() > 0)
+                  && verify_res.signature(0).status().encodedError() > 0 ) )
+        {
+            // let's try again, but this time import the public key
+            // payload (avoiding that in a first cut for being a bit
+            // speedier. also prevents all too easy poisoning/sha1
+            // fingerprint collision attacks)
+
+            // walk xml tree to PGPData node - go to children, first is
+            // SignedInfo, 2nd is signaturevalue, 3rd is KeyInfo
+            // 1st child is PGPData, 1st or 2nd grandchild is PGPKeyPacket
+            cur = xmlSecGetNextElementNode(pNode->children);
+            // TODO error handling
+            cur = xmlSecGetNextElementNode(cur->next);
+            cur = xmlSecGetNextElementNode(cur->next);
+            cur = xmlSecGetNextElementNode(cur->children);
+            // check that this is now PGPData
+            if(!xmlSecCheckNodeName(cur, xmlSecNodePGPData, xmlSecDSigNs))
+                throw RuntimeException("The GpgME library failed to initialize for the OpenPGP protocol.");
+            // check that this is now PGPKeyPacket
+            cur = xmlSecGetNextElementNode(cur->children);
+            static const xmlChar xmlSecNodePGPKeyPacket[] = "PGPKeyPacket";
+            if(!xmlSecCheckNodeName(cur, xmlSecNodePGPKeyPacket, xmlSecDSigNs))
+            {
+                // not this one, maybe the next?
+                cur = xmlSecGetNextElementNode(cur->next);
+                if(!xmlSecCheckNodeName(cur, xmlSecNodePGPKeyPacket, xmlSecDSigNs))
+                {
+                    // ok, giving up
+                    clearErrorRecorder();
+                    xmlFree(pSignatureValue);
+
+                    return aTemplate;
+                }
+            }
+
+            // got a key packet, import & re-validate
+            xmlChar* pKeyPacket=xmlNodeGetContent(cur);
+            int nKeyLen = xmlSecBase64Decode(pKeyPacket, reinterpret_cast<xmlSecByte*>(pKeyPacket), xmlStrlen(pKeyPacket));
+            if( nKeyLen < 0)
+                throw RuntimeException("The GpgME library failed to initialize for the OpenPGP protocol.");
+
+            GpgME::Data data_key(
+                reinterpret_cast<char*>(pKeyPacket),
+                nKeyLen, false);
+
+            rCtx.importKeys(data_key);
+            xmlFree(pKeyPacket);
+
+            // and re-run (rewind text and signature streams to position 0)
+            (void)data_text.seek(0,SEEK_SET);
+            (void)data_signature.seek(0,SEEK_SET);
+            verify_res=rCtx.verifyDetachedSignature(data_signature, data_text);
+
+            // TODO: needs some more error handling, needs checking _all_ signatures
+            if( verify_res.isNull() || verify_res.numSignatures() == 0
+                // there is at least 1 signature and it is anything else than valid
+                || ( (verify_res.numSignatures() > 0)
+                      && verify_res.signature(0).status().encodedError() > 0 ) )
+            {
+                clearErrorRecorder();
+                xmlFree(pSignatureValue);
+
+                return aTemplate;
+            }
+        }
+
+        xmlFree(pSignatureValue);
+
+        // now verify digest for all references
+        cur = xmlSecGetNextElementNode(pNode->children);
+        if( cur != nullptr )
+            cur = xmlSecGetNextElementNode(cur->children);
+        while( cur != nullptr )
+        {
+            // some of those children I suppose should be reference elements
+            if( xmlSecCheckNodeName(cur, xmlSecNodeReference, xmlSecDSigNs) )
+            {
+                xmlSecDSigReferenceCtxPtr pDsigRefCtx =
+                    xmlSecDSigReferenceCtxCreate(pDsigCtx,
+                                                 xmlSecDSigReferenceOriginSignedInfo);
+                if(pDsigRefCtx == nullptr)
+                    throw RuntimeException();
+
+                // add this one to the list
+                if( xmlSecPtrListAdd(&(pDsigCtx->signedInfoReferences),
+                                     pDsigRefCtx) < 0 )
+                {
+                    // TODO resource handling
+                    xmlSecDSigReferenceCtxDestroy(pDsigRefCtx);
+                    throw RuntimeException();
+                }
+
+                if( xmlSecDSigReferenceCtxProcessNode(pDsigRefCtx, cur) < 0 )
+                    throw RuntimeException();
+
+                // final check - all good?
+                if(pDsigRefCtx->status != xmlSecDSigStatusSucceeded)
+                {
+                    pDsigCtx->status = xmlSecDSigStatusInvalid;
+                    return aTemplate; // TODO - harder error?
+                }
+            }
+
+            cur = xmlSecGetNextElementNode(cur->next);
+        }
+
+        // TODO - also verify manifest (only relevant for ooxml)?
+        aTemplate->setStatus(SecurityOperationStatus_OPERATION_SUCCEEDED);
+
+        // done
+        xmlSecDSigCtxDestroy( pDsigCtx ) ;
+    }
+
+    //Unregistered the stream/URI binding
+    if( xUriBinding.is() )
+        xmlUnregisterStreamInputCallbacks() ;
+
+    clearErrorRecorder();
+    return aTemplate ;
+}
+
+/* XServiceInfo */
+OUString SAL_CALL XMLSignature_GpgImpl::getImplementationName() {
+    return impl_getImplementationName() ;
+}
+
+/* XServiceInfo */
+sal_Bool SAL_CALL XMLSignature_GpgImpl::supportsService( const OUString& serviceName) {
+    return cppu::supportsService(this, serviceName);
+}
+
+/* XServiceInfo */
+Sequence< OUString > SAL_CALL XMLSignature_GpgImpl::getSupportedServiceNames() {
+    return impl_getSupportedServiceNames() ;
+}
+
+//Helper for XServiceInfo
+Sequence< OUString > XMLSignature_GpgImpl::impl_getSupportedServiceNames() {
+    Sequence<OUString> seqServiceNames { "com.sun.star.xml.crypto.XMLSignature" };
+    return seqServiceNames ;
+}
+
+OUString XMLSignature_GpgImpl::impl_getImplementationName() {
+    return "com.sun.star.xml.security.bridge.xmlsec.XMLSignature_GpgImpl" ;
+}
+
+//Helper for registry
+Reference< XInterface > XMLSignature_GpgImpl::impl_createInstance( const Reference< XMultiServiceFactory >& ) {
+    return Reference< XInterface >( *new XMLSignature_GpgImpl ) ;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/helper/documentsignaturehelper.cxx b/xmlsecurity/source/helper/documentsignaturehelper.cxx
new file mode 100644
index 000000000..482ae6cc4
--- /dev/null
+++ b/xmlsecurity/source/helper/documentsignaturehelper.cxx
@@ -0,0 +1,592 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+
+#include <documentsignaturehelper.hxx>
+
+#include <algorithm>
+#include <functional>
+
+#include <com/sun/star/container/XNameAccess.hpp>
+#include <com/sun/star/io/IOException.hpp>
+#include <com/sun/star/embed/XStorage.hpp>
+#include <com/sun/star/embed/StorageFormats.hpp>
+#include <com/sun/star/embed/ElementModes.hpp>
+#include <com/sun/star/beans/StringPair.hpp>
+#include <com/sun/star/xml/sax/XDocumentHandler.hpp>
+
+#include <comphelper/documentconstants.hxx>
+#include <comphelper/ofopxmlhelper.hxx>
+#include <comphelper/processfactory.hxx>
+#include <osl/diagnose.h>
+#include <rtl/ref.hxx>
+#include <rtl/uri.hxx>
+#include <sal/log.hxx>
+#include <svx/xoutbmp.hxx>
+#include <tools/diagnose_ex.h>
+#include <xmloff/attrlist.hxx>
+
+#include <xsecctl.hxx>
+
+using namespace ::com::sun::star;
+using namespace ::com::sun::star::uno;
+using namespace css::xml::sax;
+
+namespace
+{
+OUString getElement(OUString const & version, ::sal_Int32 * index)
+{
+    while (*index < version.getLength() && version[*index] == '0') {
+        ++*index;
+    }
+    return version.getToken(0, '.', *index);
+}
+
+
+// Return 1 if version1 is greater than version 2, 0 if they are equal
+//and -1 if version1 is less version 2
+int compareVersions(
+    OUString const & version1, OUString const & version2)
+{
+    for (::sal_Int32 i1 = 0, i2 = 0; i1 >= 0 || i2 >= 0;) {
+        OUString e1(getElement(version1, &i1));
+        OUString e2(getElement(version2, &i2));
+        if (e1.getLength() < e2.getLength()) {
+            return -1;
+        } else if (e1.getLength() > e2.getLength()) {
+            return 1;
+        } else if (e1 < e2) {
+            return -1;
+        } else if (e1 > e2) {
+            return 1;
+        }
+    }
+    return 0;
+}
+}
+
+static void ImplFillElementList(
+    std::vector< OUString >& rList, const Reference < css::embed::XStorage >& rxStore,
+    const OUString& rRootStorageName, const bool bRecursive,
+    const DocumentSignatureAlgorithm mode)
+{
+    const Sequence< OUString > aElements = rxStore->getElementNames();
+
+    for ( const auto& rName : aElements )
+    {
+        if (rName == "[Content_Types].xml")
+            // OOXML
+            continue;
+
+        // If the user enabled validating according to OOo 3.0
+        // then mimetype and all content of META-INF must be excluded.
+        if (mode != DocumentSignatureAlgorithm::OOo3_2
+            && (rName == "META-INF" || rName == "mimetype"))
+        {
+            continue;
+        }
+        else
+        {
+            OUString sEncName = ::rtl::Uri::encode(
+                rName, rtl_UriCharClassRelSegment,
+                rtl_UriEncodeStrict, RTL_TEXTENCODING_UTF8);
+            if (sEncName.isEmpty() && !rName.isEmpty())
+                throw css::uno::RuntimeException("Failed to encode element name of XStorage", nullptr);
+
+            if ( rxStore->isStreamElement( rName ) )
+            {
+                //Exclude documentsignatures.xml!
+                if (rName ==
+                    DocumentSignatureHelper::GetDocumentContentSignatureDefaultStreamName())
+                    continue;
+                OUString aFullName( rRootStorageName + sEncName );
+                rList.push_back(aFullName);
+            }
+            else if ( bRecursive && rxStore->isStorageElement( rName ) )
+            {
+                Reference < css::embed::XStorage > xSubStore = rxStore->openStorageElement( rName, css::embed::ElementModes::READ );
+                OUString aFullRootName( rRootStorageName + sEncName + "/"  );
+                ImplFillElementList(rList, xSubStore, aFullRootName, bRecursive, mode);
+            }
+        }
+    }
+}
+
+
+bool DocumentSignatureHelper::isODFPre_1_2(const OUString & sVersion)
+{
+    //The property version exists only if the document is at least version 1.2
+    //That is, if the document has version 1.1 and sVersion is empty.
+    //The constant is defined in comphelper/documentconstants.hxx
+    return compareVersions(sVersion, ODFVER_012_TEXT) == -1;
+}
+
+bool DocumentSignatureHelper::isOOo3_2_Signature(const SignatureInformation & sigInfo)
+{
+    return std::any_of(sigInfo.vSignatureReferenceInfors.cbegin(),
+                       sigInfo.vSignatureReferenceInfors.cend(),
+                       [](const SignatureReferenceInformation& info) { return info.ouURI == "META-INF/manifest.xml"; });
+}
+
+DocumentSignatureAlgorithm
+DocumentSignatureHelper::getDocumentAlgorithm(
+    const OUString & sODFVersion, const SignatureInformation & sigInfo)
+{
+    OSL_ASSERT(!sODFVersion.isEmpty());
+    DocumentSignatureAlgorithm mode = DocumentSignatureAlgorithm::OOo3_2;
+    if (!isOOo3_2_Signature(sigInfo))
+    {
+        if (isODFPre_1_2(sODFVersion))
+            mode = DocumentSignatureAlgorithm::OOo2;
+        else
+            mode = DocumentSignatureAlgorithm::OOo3_0;
+    }
+    return mode;
+}
+
+//The function creates a list of files which are to be signed or for which
+//the signature is to be validated. The strings are UTF8 encoded URIs which
+//contain '/' as path separators.
+//
+//The algorithm how document signatures are created and validated has
+//changed over time. The change affects only which files within the document
+//are changed. Document signatures created by OOo 2.x only used particular files. Since
+//OOo 3.0 everything except "mimetype" and "META-INF" are signed. As of OOo 3.2 everything
+//except META-INF/documentsignatures.xml is signed.
+//Signatures are validated according to the algorithm which was then used for validation.
+//That is, when validating a signature which was created by OOo 3.0, then mimetype and
+//META-INF are not used.
+//
+//When a signature is created then we always use the latest algorithm. That is, we use
+//that of OOo 3.2
+std::vector< OUString >
+DocumentSignatureHelper::CreateElementList(
+    const Reference < css::embed::XStorage >& rxStore,
+    DocumentSignatureMode eMode,
+    const DocumentSignatureAlgorithm mode)
+{
+    std::vector< OUString > aElements;
+    OUString aSep(  "/"  );
+
+    switch ( eMode )
+    {
+        case DocumentSignatureMode::Content:
+        {
+            if (mode == DocumentSignatureAlgorithm::OOo2) //that is, ODF 1.0, 1.1
+            {
+                // 1) Main content
+                ImplFillElementList(aElements, rxStore, OUString(), false, mode);
+
+                // 2) Pictures...
+                OUString aSubStorageName( "Pictures" );
+                try
+                {
+                    Reference < css::embed::XStorage > xSubStore = rxStore->openStorageElement( aSubStorageName, css::embed::ElementModes::READ );
+                    ImplFillElementList(aElements, xSubStore, aSubStorageName+aSep, true, mode);
+                }
+                catch(css::io::IOException& )
+                {
+                    ; // Doesn't have to exist...
+                }
+                // 3) OLE...
+                aSubStorageName = "ObjectReplacements";
+                try
+                {
+                    Reference < css::embed::XStorage > xSubStore = rxStore->openStorageElement( aSubStorageName, css::embed::ElementModes::READ );
+                    ImplFillElementList(aElements, xSubStore, aSubStorageName+aSep, true, mode);
+                    xSubStore.clear();
+
+                    // Object folders...
+                    const Sequence< OUString > aElementNames = rxStore->getElementNames();
+                    for ( const auto& rName : aElementNames )
+                    {
+                        if ( ( rName.match( "Object " ) ) && rxStore->isStorageElement( rName ) )
+                        {
+                            Reference < css::embed::XStorage > xTmpSubStore = rxStore->openStorageElement( rName, css::embed::ElementModes::READ );
+                            ImplFillElementList(aElements, xTmpSubStore, rName+aSep, true, mode);
+                        }
+                    }
+                }
+                catch( css::io::IOException& )
+                {
+                    ; // Doesn't have to exist...
+                }
+            }
+            else
+            {
+                // Everything except META-INF
+                ImplFillElementList(aElements, rxStore, OUString(), true, mode);
+            }
+        }
+        break;
+        case DocumentSignatureMode::Macros:
+        {
+            // 1) Macros
+            OUString aSubStorageName( "Basic" );
+            try
+            {
+                Reference < css::embed::XStorage > xSubStore = rxStore->openStorageElement( aSubStorageName, css::embed::ElementModes::READ );
+                ImplFillElementList(aElements, xSubStore, aSubStorageName+aSep, true, mode);
+            }
+            catch( css::io::IOException& )
+            {
+                ; // Doesn't have to exist...
+            }
+
+            // 2) Dialogs
+            aSubStorageName = "Dialogs";
+            try
+            {
+                Reference < css::embed::XStorage > xSubStore = rxStore->openStorageElement( aSubStorageName, css::embed::ElementModes::READ );
+                ImplFillElementList(aElements, xSubStore, aSubStorageName+aSep, true, mode);
+            }
+            catch( css::io::IOException& )
+            {
+                ; // Doesn't have to exist...
+            }
+            // 3) Scripts
+            aSubStorageName = "Scripts";
+            try
+            {
+                Reference < css::embed::XStorage > xSubStore = rxStore->openStorageElement( aSubStorageName, css::embed::ElementModes::READ );
+                ImplFillElementList(aElements, xSubStore, aSubStorageName+aSep, true, mode);
+            }
+            catch( css::io::IOException& )
+            {
+                ; // Doesn't have to exist...
+            }
+        }
+        break;
+        case DocumentSignatureMode::Package:
+        {
+            // Everything except META-INF
+            ImplFillElementList(aElements, rxStore, OUString(), true, mode);
+        }
+        break;
+    }
+
+    return aElements;
+}
+
+void DocumentSignatureHelper::AppendContentTypes(const uno::Reference<embed::XStorage>& xStorage, std::vector<OUString>& rElements)
+{
+    if (!xStorage.is() || !xStorage->hasByName("[Content_Types].xml"))
+        // ODF
+        return;
+
+    uno::Reference<io::XInputStream> xRelStream(xStorage->openStreamElement("[Content_Types].xml", embed::ElementModes::READ), uno::UNO_QUERY);
+    uno::Sequence< uno::Sequence<beans::StringPair> > aContentTypeInfo = comphelper::OFOPXMLHelper::ReadContentTypeSequence(xRelStream, comphelper::getProcessComponentContext());
+    if (aContentTypeInfo.getLength() < 2)
+    {
+        SAL_WARN("xmlsecurity.helper", "no defaults or overrides in aContentTypeInfo");
+        return;
+    }
+    uno::Sequence<beans::StringPair>& rDefaults = aContentTypeInfo[0];
+    uno::Sequence<beans::StringPair>& rOverrides = aContentTypeInfo[1];
+
+    for (OUString& rElement : rElements)
+    {
+        auto it = std::find_if(rOverrides.begin(), rOverrides.end(), [&](const beans::StringPair& rPair)
+        {
+            return rPair.First == "/" + rElement;
+        });
+
+        if (it != rOverrides.end())
+        {
+            rElement = "/" + rElement + "?ContentType=" + it->Second;
+            continue;
+        }
+
+        it = std::find_if(rDefaults.begin(), rDefaults.end(), [&](const beans::StringPair& rPair)
+        {
+            return rElement.endsWith("." + rPair.First);
+        });
+
+        if (it != rDefaults.end())
+        {
+            rElement = "/" + rElement + "?ContentType=" + it->Second;
+            continue;
+        }
+        SAL_WARN("xmlsecurity.helper", "found no content type for " << rElement);
+    }
+
+    std::sort(rElements.begin(), rElements.end());
+}
+
+SignatureStreamHelper DocumentSignatureHelper::OpenSignatureStream(
+    const Reference < css::embed::XStorage >& rxStore, sal_Int32 nOpenMode, DocumentSignatureMode eDocSigMode )
+{
+    sal_Int32 nSubStorageOpenMode = css::embed::ElementModes::READ;
+    if ( nOpenMode & css::embed::ElementModes::WRITE )
+        nSubStorageOpenMode = css::embed::ElementModes::WRITE;
+
+    SignatureStreamHelper aHelper;
+
+    if (!rxStore.is())
+        return aHelper;
+
+    if (rxStore->hasByName("META-INF"))
+    {
+        try
+        {
+            aHelper.xSignatureStorage = rxStore->openStorageElement( "META-INF", nSubStorageOpenMode );
+            if ( aHelper.xSignatureStorage.is() )
+            {
+                OUString aSIGStreamName;
+                if ( eDocSigMode == DocumentSignatureMode::Content )
+                    aSIGStreamName = DocumentSignatureHelper::GetDocumentContentSignatureDefaultStreamName();
+                else if ( eDocSigMode == DocumentSignatureMode::Macros )
+                    aSIGStreamName = DocumentSignatureHelper::GetScriptingContentSignatureDefaultStreamName();
+                else
+                    aSIGStreamName = DocumentSignatureHelper::GetPackageSignatureDefaultStreamName();
+
+                aHelper.xSignatureStream = aHelper.xSignatureStorage->openStreamElement( aSIGStreamName, nOpenMode );
+            }
+        }
+        catch(css::io::IOException& )
+        {
+            // Doesn't have to exist...
+            SAL_WARN_IF( nOpenMode != css::embed::ElementModes::READ, "xmlsecurity.helper", "Error creating signature stream..." );
+        }
+    }
+    else if(rxStore->hasByName("[Content_Types].xml"))
+    {
+        try
+        {
+            if (rxStore->hasByName("_xmlsignatures") && (nOpenMode & embed::ElementModes::TRUNCATE))
+                // Truncate, then all signatures will be written -> remove previous ones.
+                rxStore->removeElement("_xmlsignatures");
+
+            aHelper.xSignatureStorage = rxStore->openStorageElement("_xmlsignatures", nSubStorageOpenMode);
+            aHelper.nStorageFormat = embed::StorageFormats::OFOPXML;
+        }
+        catch (const io::IOException&)
+        {
+            TOOLS_WARN_EXCEPTION_IF(nOpenMode != css::embed::ElementModes::READ, "xmlsecurity.helper", "DocumentSignatureHelper::OpenSignatureStream:");
+        }
+    }
+
+    return aHelper;
+}
+
+/** Check whether the current file can be signed with GPG (only ODF >= 1.2 can currently) */
+bool DocumentSignatureHelper::CanSignWithGPG(
+    const Reference < css::embed::XStorage >& rxStore,
+    const OUString& sOdfVersion)
+{
+    if (!rxStore.is())
+        return false;
+
+    if (rxStore->hasByName("META-INF")) // ODF
+    {
+        return !isODFPre_1_2(sOdfVersion);
+    }
+
+    return false;
+}
+
+
+
+//sElementList contains all files which are expected to be signed. Only those files must me signed,
+//no more, no less.
+//The DocumentSignatureAlgorithm indicates if the document was created with OOo 2.x. Then
+//the uri s in the Reference elements in the signature, were not properly encoded.
+// For example: <Reference URI="ObjectReplacements/Object 1">
+bool DocumentSignatureHelper::checkIfAllFilesAreSigned(
+    const ::std::vector< OUString > & sElementList,
+    const SignatureInformation & sigInfo,
+    const DocumentSignatureAlgorithm alg)
+{
+    // Can only be valid if ALL streams are signed, which means real stream count == signed stream count
+    unsigned int nRealCount = 0;
+    std::function<OUString(const OUString&)> fEncode = [](const OUString& rStr) { return rStr; };
+    if (alg == DocumentSignatureAlgorithm::OOo2)
+        //Comparing URIs is a difficult. Therefore we kind of normalize
+        //it before comparing. We assume that our URI do not have a leading "./"
+        //and fragments at the end (...#...)
+        fEncode = [](const OUString& rStr) {
+            return rtl::Uri::encode(rStr, rtl_UriCharClassPchar, rtl_UriEncodeCheckEscapes, RTL_TEXTENCODING_UTF8);
+        };
+
+    for ( int i = sigInfo.vSignatureReferenceInfors.size(); i; )
+    {
+        const SignatureReferenceInformation& rInf = sigInfo.vSignatureReferenceInfors[--i];
+        // There is also an extra entry of type SignatureReferenceType::SAMEDOCUMENT because of signature date.
+        if ( ( rInf.nType == SignatureReferenceType::BINARYSTREAM ) || ( rInf.nType == SignatureReferenceType::XMLSTREAM ) )
+        {
+            //find the file in the element list
+            if (std::any_of(sElementList.cbegin(), sElementList.cend(),
+                    [&fEncode, &rInf](const OUString& rElement) { return fEncode(rElement) == fEncode(rInf.ouURI); }))
+                nRealCount++;
+        }
+    }
+    return  sElementList.size() == nRealCount;
+}
+
+/*Compares the Uri which are obtained from CreateElementList with
+  the  path obtained from the manifest.xml.
+  Returns true if both strings are equal.
+*/
+bool DocumentSignatureHelper::equalsReferenceUriManifestPath(
+    const OUString & rUri, const OUString & rPath)
+{
+    //split up the uri and path into segments. Both are separated by '/'
+    std::vector<OUString> vUriSegments;
+    for (sal_Int32 nIndex = 0; nIndex >= 0; )
+        vUriSegments.push_back(rUri.getToken( 0, '/', nIndex ));
+
+    std::vector<OUString> vPathSegments;
+    for (sal_Int32 nIndex = 0; nIndex >= 0; )
+        vPathSegments.push_back(rPath.getToken( 0, '/', nIndex ));
+
+    if (vUriSegments.size() != vPathSegments.size())
+        return false;
+
+    //Now compare each segment of the uri with its counterpart from the path
+    return std::equal(
+        vUriSegments.cbegin(), vUriSegments.cend(), vPathSegments.cbegin(),
+        [](const OUString& rUriSegment, const OUString& rPathSegment) {
+            //Decode the uri segment, so that %20 becomes ' ', etc.
+            OUString sDecUri = rtl::Uri::decode(rUriSegment, rtl_UriDecodeWithCharset,  RTL_TEXTENCODING_UTF8);
+            return sDecUri == rPathSegment;
+        });
+}
+
+OUString DocumentSignatureHelper::GetDocumentContentSignatureDefaultStreamName()
+{
+    return "documentsignatures.xml";
+}
+
+OUString DocumentSignatureHelper::GetScriptingContentSignatureDefaultStreamName()
+{
+    return "macrosignatures.xml";
+}
+
+OUString DocumentSignatureHelper::GetPackageSignatureDefaultStreamName()
+{
+    return "packagesignatures.xml";
+}
+
+void DocumentSignatureHelper::writeDigestMethod(
+    const uno::Reference<xml::sax::XDocumentHandler>& xDocumentHandler)
+{
+    rtl::Reference<SvXMLAttributeList> pAttributeList(new SvXMLAttributeList());
+    pAttributeList->AddAttribute("Algorithm", ALGO_XMLDSIGSHA256);
+    xDocumentHandler->startElement("DigestMethod", uno::Reference<xml::sax::XAttributeList>(pAttributeList.get()));
+    xDocumentHandler->endElement("DigestMethod");
+}
+
+void DocumentSignatureHelper::writeSignedProperties(
+    const uno::Reference<xml::sax::XDocumentHandler>& xDocumentHandler,
+    const SignatureInformation& signatureInfo,
+    const OUString& sDate, const bool bWriteSignatureLineData)
+{
+    {
+        rtl::Reference<SvXMLAttributeList> pAttributeList(new SvXMLAttributeList());
+        pAttributeList->AddAttribute("Id", "idSignedProperties");
+        xDocumentHandler->startElement("xd:SignedProperties", uno::Reference<xml::sax::XAttributeList>(pAttributeList.get()));
+    }
+
+    xDocumentHandler->startElement("xd:SignedSignatureProperties", uno::Reference<xml::sax::XAttributeList>(new SvXMLAttributeList()));
+    xDocumentHandler->startElement("xd:SigningTime", uno::Reference<xml::sax::XAttributeList>(new SvXMLAttributeList()));
+    xDocumentHandler->characters(sDate);
+    xDocumentHandler->endElement("xd:SigningTime");
+    xDocumentHandler->startElement("xd:SigningCertificate", uno::Reference<xml::sax::XAttributeList>(new SvXMLAttributeList()));
+    xDocumentHandler->startElement("xd:Cert", uno::Reference<xml::sax::XAttributeList>(new SvXMLAttributeList()));
+    xDocumentHandler->startElement("xd:CertDigest", uno::Reference<xml::sax::XAttributeList>(new SvXMLAttributeList()));
+    writeDigestMethod(xDocumentHandler);
+
+    xDocumentHandler->startElement("DigestValue", uno::Reference<xml::sax::XAttributeList>(new SvXMLAttributeList()));
+    // TODO: this is empty for gpg signatures currently
+    //assert(!signatureInfo.ouCertDigest.isEmpty());
+    xDocumentHandler->characters(signatureInfo.ouCertDigest);
+    xDocumentHandler->endElement("DigestValue");
+
+    xDocumentHandler->endElement("xd:CertDigest");
+    xDocumentHandler->startElement("xd:IssuerSerial", uno::Reference<xml::sax::XAttributeList>(new SvXMLAttributeList()));
+    xDocumentHandler->startElement("X509IssuerName", uno::Reference<xml::sax::XAttributeList>(new SvXMLAttributeList()));
+    xDocumentHandler->characters(signatureInfo.ouX509IssuerName);
+    xDocumentHandler->endElement("X509IssuerName");
+    xDocumentHandler->startElement("X509SerialNumber", uno::Reference<xml::sax::XAttributeList>(new SvXMLAttributeList()));
+    xDocumentHandler->characters(signatureInfo.ouX509SerialNumber);
+    xDocumentHandler->endElement("X509SerialNumber");
+    xDocumentHandler->endElement("xd:IssuerSerial");
+    xDocumentHandler->endElement("xd:Cert");
+    xDocumentHandler->endElement("xd:SigningCertificate");
+    xDocumentHandler->startElement("xd:SignaturePolicyIdentifier", uno::Reference<xml::sax::XAttributeList>(new SvXMLAttributeList()));
+    xDocumentHandler->startElement("xd:SignaturePolicyImplied", uno::Reference<xml::sax::XAttributeList>(new SvXMLAttributeList()));
+    xDocumentHandler->endElement("xd:SignaturePolicyImplied");
+    xDocumentHandler->endElement("xd:SignaturePolicyIdentifier");
+
+    if (bWriteSignatureLineData && !signatureInfo.ouSignatureLineId.isEmpty()
+        && signatureInfo.aValidSignatureImage.is() && signatureInfo.aInvalidSignatureImage.is())
+    {
+        rtl::Reference<SvXMLAttributeList> pAttributeList(new SvXMLAttributeList());
+        pAttributeList->AddAttribute(
+            "xmlns:loext", "urn:org:documentfoundation:names:experimental:office:xmlns:loext:1.0");
+        xDocumentHandler->startElement(
+            "loext:SignatureLine",
+            Reference<XAttributeList>(pAttributeList.get()));
+
+        {
+            // Write SignatureLineId element
+            xDocumentHandler->startElement(
+                "loext:SignatureLineId",
+                Reference<XAttributeList>(new SvXMLAttributeList()));
+            xDocumentHandler->characters(signatureInfo.ouSignatureLineId);
+            xDocumentHandler->endElement("loext:SignatureLineId");
+        }
+
+        {
+            // Write SignatureLineValidImage element
+            xDocumentHandler->startElement(
+                "loext:SignatureLineValidImage",
+                Reference<XAttributeList>(new SvXMLAttributeList()));
+
+            OUString aGraphicInBase64;
+            Graphic aGraphic(signatureInfo.aValidSignatureImage);
+            if (!XOutBitmap::GraphicToBase64(aGraphic, aGraphicInBase64, false))
+                SAL_WARN("xmlsecurity.helper", "could not convert graphic to base64");
+
+            xDocumentHandler->characters(aGraphicInBase64);
+            xDocumentHandler->endElement("loext:SignatureLineValidImage");
+        }
+
+        {
+            // Write SignatureLineInvalidImage element
+            xDocumentHandler->startElement(
+                "loext:SignatureLineInvalidImage",
+                Reference<XAttributeList>(new SvXMLAttributeList()));
+            OUString aGraphicInBase64;
+            Graphic aGraphic(signatureInfo.aInvalidSignatureImage);
+            if (!XOutBitmap::GraphicToBase64(aGraphic, aGraphicInBase64, false))
+                SAL_WARN("xmlsecurity.helper", "could not convert graphic to base64");
+            xDocumentHandler->characters(aGraphicInBase64);
+            xDocumentHandler->endElement("loext:SignatureLineInvalidImage");
+        }
+
+        xDocumentHandler->endElement("loext:SignatureLine");
+    }
+
+    xDocumentHandler->endElement("xd:SignedSignatureProperties");
+
+    xDocumentHandler->endElement("xd:SignedProperties");
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/helper/documentsignaturemanager.cxx b/xmlsecurity/source/helper/documentsignaturemanager.cxx
new file mode 100644
index 000000000..79d2cdf26
--- /dev/null
+++ b/xmlsecurity/source/helper/documentsignaturemanager.cxx
@@ -0,0 +1,687 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <documentsignaturemanager.hxx>
+#include <config_gpgme.h>
+
+#include <gpg/SEInitializer.hxx>
+
+#include <com/sun/star/embed/StorageFormats.hpp>
+#include <com/sun/star/embed/ElementModes.hpp>
+#include <com/sun/star/embed/XStorage.hpp>
+#include <com/sun/star/io/TempFile.hpp>
+#include <com/sun/star/io/XTruncate.hpp>
+#include <com/sun/star/embed/XTransactedObject.hpp>
+#include <com/sun/star/xml/crypto/SEInitializer.hpp>
+#include <com/sun/star/lang/XServiceInfo.hpp>
+#include <com/sun/star/beans/PropertyValue.hpp>
+#include <com/sun/star/packages/manifest/ManifestReader.hpp>
+#include <com/sun/star/container/XNameAccess.hpp>
+#include <com/sun/star/xml/sax/XDocumentHandler.hpp>
+#include <com/sun/star/xml/sax/XWriter.hpp>
+
+#include <comphelper/base64.hxx>
+#include <comphelper/storagehelper.hxx>
+#include <rtl/ustrbuf.hxx>
+#include <sal/log.hxx>
+#include <tools/datetime.hxx>
+
+#include <certificate.hxx>
+#include <biginteger.hxx>
+
+#include <xmlsec/xmlsec_init.hxx>
+
+#include <pdfsignaturehelper.hxx>
+
+#include <memory>
+
+using namespace css;
+using namespace css::graphic;
+using namespace css::uno;
+
+DocumentSignatureManager::DocumentSignatureManager(
+    const uno::Reference<uno::XComponentContext>& xContext, DocumentSignatureMode eMode)
+    : mxContext(xContext)
+    , maSignatureHelper(xContext)
+    , meSignatureMode(eMode)
+{
+}
+
+DocumentSignatureManager::~DocumentSignatureManager() { deInitXmlSec(); }
+
+bool DocumentSignatureManager::init()
+{
+    SAL_WARN_IF(mxSEInitializer.is(), "xmlsecurity.helper",
+                "DocumentSignatureManager::Init - mxSEInitializer already set!");
+    SAL_WARN_IF(mxSecurityContext.is(), "xmlsecurity.helper",
+                "DocumentSignatureManager::Init - mxSecurityContext already set!");
+    SAL_WARN_IF(mxGpgSEInitializer.is(), "xmlsecurity.helper",
+                "DocumentSignatureManager::Init - mxGpgSEInitializer already set!");
+
+    // xmlsec is needed by both services, so init before those
+    initXmlSec();
+
+    mxSEInitializer = xml::crypto::SEInitializer::create(mxContext);
+#if HAVE_FEATURE_GPGME
+    mxGpgSEInitializer.set(new SEInitializerGpg());
+#endif
+
+    if (mxSEInitializer.is())
+        mxSecurityContext = mxSEInitializer->createSecurityContext(OUString());
+
+#if HAVE_FEATURE_GPGME
+    if (mxGpgSEInitializer.is())
+        mxGpgSecurityContext = mxGpgSEInitializer->createSecurityContext(OUString());
+
+    return mxSecurityContext.is() || mxGpgSecurityContext.is();
+#else
+    return mxSecurityContext.is();
+#endif
+}
+
+PDFSignatureHelper& DocumentSignatureManager::getPDFSignatureHelper()
+{
+    bool bInit = true;
+    if (!mxSecurityContext.is())
+        bInit = init();
+
+    SAL_WARN_IF(!bInit, "xmlsecurity.comp", "Error initializing security context!");
+
+    if (!mpPDFSignatureHelper)
+        mpPDFSignatureHelper = std::make_unique<PDFSignatureHelper>();
+
+    return *mpPDFSignatureHelper;
+}
+
+#if 0 // For some reason does not work
+bool DocumentSignatureManager::IsXAdESRelevant()
+{
+    if (mxStore.is())
+    {
+        // ZIP-based: ODF or OOXML.
+        maSignatureHelper.StartMission();
+
+        SignatureStreamHelper aStreamHelper = ImplOpenSignatureStream(embed::ElementModes::READ, /*bUseTempStream=*/true);
+        if (aStreamHelper.nStorageFormat == embed::StorageFormats::OFOPXML)
+        {
+            maSignatureHelper.EndMission();
+            return false;
+        }
+        // FIXME: How to figure out if it is ODF 1.2?
+        maSignatureHelper.EndMission();
+        return true;
+    }
+    return false;
+}
+#endif
+
+bool DocumentSignatureManager::readManifest()
+{
+    // Check if manifest was already read
+    if (m_manifest.hasElements())
+        return true;
+
+    if (!mxContext.is())
+        return false;
+
+    if (!mxStore.is())
+        return false;
+
+    uno::Reference<packages::manifest::XManifestReader> xReader
+        = packages::manifest::ManifestReader::create(mxContext);
+
+    if (mxStore->hasByName("META-INF"))
+    {
+        //Get the manifest.xml
+        uno::Reference<embed::XStorage> xSubStore(
+            mxStore->openStorageElement("META-INF", embed::ElementModes::READ), UNO_SET_THROW);
+
+        uno::Reference<io::XInputStream> xStream(
+            xSubStore->openStreamElement("manifest.xml", css::embed::ElementModes::READ),
+            UNO_QUERY_THROW);
+
+        m_manifest = xReader->readManifestSequence(xStream);
+    }
+    return true;
+}
+
+/* Using the zip storage, we cannot get the properties "MediaType" and "IsEncrypted"
+    We use the manifest to find out if a file is xml and if it is encrypted.
+    The parameter is an encoded uri. However, the manifest contains paths. Therefore
+    the path is encoded as uri, so they can be compared.
+*/
+bool DocumentSignatureManager::isXML(const OUString& rURI)
+{
+    SAL_WARN_IF(!mxStore.is(), "xmlsecurity.helper", "empty storage reference");
+
+    bool bIsXML = false;
+    bool bPropsAvailable = false;
+    const OUString sPropFullPath("FullPath");
+    const OUString sPropMediaType("MediaType");
+    const OUString sPropDigest("Digest");
+
+    if (readManifest())
+    {
+        for (const uno::Sequence<beans::PropertyValue>& entry : std::as_const(m_manifest))
+        {
+            OUString sPath;
+            OUString sMediaType;
+            bool bEncrypted = false;
+            for (const beans::PropertyValue& prop : entry)
+            {
+                if (prop.Name == sPropFullPath)
+                    prop.Value >>= sPath;
+                else if (prop.Name == sPropMediaType)
+                    prop.Value >>= sMediaType;
+                else if (prop.Name == sPropDigest)
+                    bEncrypted = true;
+            }
+            if (DocumentSignatureHelper::equalsReferenceUriManifestPath(rURI, sPath))
+            {
+                bIsXML = sMediaType == "text/xml" && !bEncrypted;
+                bPropsAvailable = true;
+                break;
+            }
+        }
+    }
+    if (!bPropsAvailable)
+    {
+        //This would be the case for at least mimetype, META-INF/manifest.xml
+        //META-INF/macrosignatures.xml.
+        //Files can only be encrypted if they are in the manifest.xml.
+        //That is, the current file cannot be encrypted, otherwise bPropsAvailable
+        //would be true.
+        sal_Int32 nSep = rURI.lastIndexOf('.');
+        if (nSep != -1)
+        {
+            OUString aExt = rURI.copy(nSep + 1);
+            if (aExt.equalsIgnoreAsciiCase("XML"))
+                bIsXML = true;
+        }
+    }
+    return bIsXML;
+}
+
+//If bTempStream is true, then a temporary stream is return. If it is false then, the actual
+//signature stream is used.
+//Every time the user presses Add a new temporary stream is created.
+//We keep the temporary stream as member because ImplGetSignatureInformations
+//will later access the stream to create DocumentSignatureInformation objects
+//which are stored in maCurrentSignatureInformations.
+SignatureStreamHelper DocumentSignatureManager::ImplOpenSignatureStream(sal_Int32 nStreamOpenMode,
+                                                                        bool bTempStream)
+{
+    SignatureStreamHelper aHelper;
+    if (mxStore.is() && mxStore->hasByName("[Content_Types].xml"))
+        aHelper.nStorageFormat = embed::StorageFormats::OFOPXML;
+
+    if (bTempStream)
+    {
+        if (nStreamOpenMode & embed::ElementModes::TRUNCATE)
+        {
+            //We write always into a new temporary stream.
+            mxTempSignatureStream.set(io::TempFile::create(mxContext), uno::UNO_QUERY_THROW);
+            if (aHelper.nStorageFormat != embed::StorageFormats::OFOPXML)
+                aHelper.xSignatureStream = mxTempSignatureStream;
+            else
+            {
+                mxTempSignatureStorage = comphelper::OStorageHelper::GetStorageOfFormatFromStream(
+                    ZIP_STORAGE_FORMAT_STRING, mxTempSignatureStream);
+                aHelper.xSignatureStorage = mxTempSignatureStorage;
+            }
+        }
+        else
+        {
+            //When we read from the temp stream, then we must have previously
+            //created one.
+            SAL_WARN_IF(!mxTempSignatureStream.is(), "xmlsecurity.helper",
+                        "empty temp. signature stream reference");
+        }
+        aHelper.xSignatureStream = mxTempSignatureStream;
+        if (aHelper.nStorageFormat == embed::StorageFormats::OFOPXML)
+            aHelper.xSignatureStorage = mxTempSignatureStorage;
+    }
+    else
+    {
+        //No temporary stream
+        if (!mxSignatureStream.is())
+        {
+            //We may not have a dedicated stream for writing the signature
+            //So we take one directly from the storage
+            //Or DocumentDigitalSignatures::showDocumentContentSignatures was called,
+            //in which case Add/Remove is not allowed. This is done, for example, if the
+            //document is readonly
+            aHelper = DocumentSignatureHelper::OpenSignatureStream(mxStore, nStreamOpenMode,
+                                                                   meSignatureMode);
+        }
+        else
+        {
+            aHelper.xSignatureStream = mxSignatureStream;
+        }
+    }
+
+    if (nStreamOpenMode & embed::ElementModes::TRUNCATE)
+    {
+        if (aHelper.xSignatureStream.is()
+            && aHelper.nStorageFormat != embed::StorageFormats::OFOPXML)
+        {
+            uno::Reference<io::XTruncate> xTruncate(aHelper.xSignatureStream, uno::UNO_QUERY_THROW);
+            xTruncate->truncate();
+        }
+    }
+    else if (bTempStream || mxSignatureStream.is())
+    {
+        //In case we read the signature stream from the storage directly,
+        //which is the case when DocumentDigitalSignatures::showDocumentContentSignatures
+        //then XSeakable is not supported
+        uno::Reference<io::XSeekable> xSeek(aHelper.xSignatureStream, uno::UNO_QUERY_THROW);
+        xSeek->seek(0);
+    }
+
+    return aHelper;
+}
+
+bool DocumentSignatureManager::add(
+    const uno::Reference<security::XCertificate>& xCert,
+    const uno::Reference<xml::crypto::XXMLSecurityContext>& xSecurityContext,
+    const OUString& rDescription, sal_Int32& nSecurityId, bool bAdESCompliant,
+    const OUString& rSignatureLineId, const Reference<XGraphic>& xValidGraphic,
+    const Reference<XGraphic>& xInvalidGraphic)
+{
+    if (!xCert.is())
+    {
+        SAL_WARN("xmlsecurity.helper", "no certificate selected");
+        return false;
+    }
+
+    // GPG or X509 key?
+    uno::Reference<lang::XServiceInfo> xServiceInfo(xSecurityContext, uno::UNO_QUERY);
+    if (xServiceInfo->getImplementationName()
+        == "com.sun.star.xml.security.gpg.XMLSecurityContext_GpgImpl")
+    {
+        // GPG keys only really have PGPKeyId and PGPKeyPacket
+        if (!mxStore.is())
+        {
+            SAL_WARN("xmlsecurity.helper", "cannot sign pdfs with GPG keys");
+            return false;
+        }
+
+        maSignatureHelper.StartMission(xSecurityContext);
+
+        nSecurityId = maSignatureHelper.GetNewSecurityId();
+
+        OUStringBuffer aStrBuffer;
+        comphelper::Base64::encode(aStrBuffer, xCert->getEncoded());
+
+        OUString aKeyId;
+        if (auto pCertificate = dynamic_cast<xmlsecurity::Certificate*>(xCert.get()))
+        {
+            OUStringBuffer aBuffer;
+            comphelper::Base64::encode(aBuffer, pCertificate->getSHA256Thumbprint());
+            aKeyId = aBuffer.makeStringAndClear();
+        }
+        else
+            SAL_WARN("xmlsecurity.helper",
+                     "XCertificate implementation without an xmlsecurity::Certificate one");
+
+        maSignatureHelper.SetGpgCertificate(nSecurityId, aKeyId, aStrBuffer.makeStringAndClear(),
+                                            xCert->getIssuerName());
+    }
+    else
+    {
+        OUString aCertSerial = xmlsecurity::bigIntegerToNumericString(xCert->getSerialNumber());
+        if (aCertSerial.isEmpty())
+        {
+            SAL_WARN("xmlsecurity.helper", "Error in Certificate, problem with serial number!");
+            return false;
+        }
+
+        if (!mxStore.is())
+        {
+            // Something not ZIP based, try PDF.
+            nSecurityId = getPDFSignatureHelper().GetNewSecurityId();
+            getPDFSignatureHelper().SetX509Certificate(xCert);
+            getPDFSignatureHelper().SetDescription(rDescription);
+            uno::Reference<io::XInputStream> xInputStream(mxSignatureStream, uno::UNO_QUERY);
+            if (!getPDFSignatureHelper().Sign(xInputStream, bAdESCompliant))
+            {
+                SAL_WARN("xmlsecurity.helper", "PDFSignatureHelper::Sign() failed");
+                return false;
+            }
+            return true;
+        }
+
+        maSignatureHelper.StartMission(xSecurityContext);
+
+        nSecurityId = maSignatureHelper.GetNewSecurityId();
+
+        OUStringBuffer aStrBuffer;
+        comphelper::Base64::encode(aStrBuffer, xCert->getEncoded());
+
+        OUString aCertDigest;
+        svl::crypto::SignatureMethodAlgorithm eAlgorithmID
+            = svl::crypto::SignatureMethodAlgorithm::RSA;
+        if (auto pCertificate = dynamic_cast<xmlsecurity::Certificate*>(xCert.get()))
+        {
+            OUStringBuffer aBuffer;
+            comphelper::Base64::encode(aBuffer, pCertificate->getSHA256Thumbprint());
+            aCertDigest = aBuffer.makeStringAndClear();
+
+            eAlgorithmID = pCertificate->getSignatureMethodAlgorithm();
+        }
+        else
+            SAL_WARN("xmlsecurity.helper",
+                     "XCertificate implementation without an xmlsecurity::Certificate one");
+
+        maSignatureHelper.SetX509Certificate(nSecurityId, xCert->getIssuerName(), aCertSerial,
+                                             aStrBuffer.makeStringAndClear(), aCertDigest,
+                                             eAlgorithmID);
+    }
+
+    const uno::Sequence<uno::Reference<security::XCertificate>> aCertPath
+        = xSecurityContext->getSecurityEnvironment()->buildCertificatePath(xCert);
+
+    OUStringBuffer aStrBuffer;
+    for (uno::Reference<security::XCertificate> const& rxCertificate : aCertPath)
+    {
+        comphelper::Base64::encode(aStrBuffer, rxCertificate->getEncoded());
+        OUString aString = aStrBuffer.makeStringAndClear();
+        maSignatureHelper.AddEncapsulatedX509Certificate(aString);
+    }
+
+    std::vector<OUString> aElements = DocumentSignatureHelper::CreateElementList(
+        mxStore, meSignatureMode, DocumentSignatureAlgorithm::OOo3_2);
+    DocumentSignatureHelper::AppendContentTypes(mxStore, aElements);
+
+    for (OUString const& rUri : aElements)
+    {
+        bool bBinaryMode = !isXML(rUri);
+        maSignatureHelper.AddForSigning(nSecurityId, rUri, bBinaryMode, bAdESCompliant);
+    }
+
+    maSignatureHelper.SetDateTime(nSecurityId, DateTime(DateTime::SYSTEM));
+    maSignatureHelper.SetDescription(nSecurityId, rDescription);
+
+    if (!rSignatureLineId.isEmpty())
+        maSignatureHelper.SetSignatureLineId(nSecurityId, rSignatureLineId);
+
+    if (xValidGraphic.is())
+        maSignatureHelper.SetSignatureLineValidGraphic(nSecurityId, xValidGraphic);
+
+    if (xInvalidGraphic.is())
+        maSignatureHelper.SetSignatureLineInvalidGraphic(nSecurityId, xInvalidGraphic);
+
+    // We open a signature stream in which the existing and the new
+    //signature is written. ImplGetSignatureInformation (later in this function) will
+    //then read the stream and fill maCurrentSignatureInformations. The final signature
+    //is written when the user presses OK. Then only maCurrentSignatureInformation and
+    //a sax writer are used to write the information.
+    SignatureStreamHelper aStreamHelper
+        = ImplOpenSignatureStream(embed::ElementModes::WRITE | embed::ElementModes::TRUNCATE, true);
+
+    if (aStreamHelper.nStorageFormat != embed::StorageFormats::OFOPXML)
+    {
+        uno::Reference<io::XOutputStream> xOutputStream(aStreamHelper.xSignatureStream,
+                                                        uno::UNO_QUERY_THROW);
+        uno::Reference<xml::sax::XWriter> xSaxWriter
+            = maSignatureHelper.CreateDocumentHandlerWithHeader(xOutputStream);
+
+        // Export old signatures...
+        uno::Reference<xml::sax::XDocumentHandler> xDocumentHandler(xSaxWriter,
+                                                                    uno::UNO_QUERY_THROW);
+        std::size_t nInfos = maCurrentSignatureInformations.size();
+        for (std::size_t n = 0; n < nInfos; n++)
+            XMLSignatureHelper::ExportSignature(xDocumentHandler, maCurrentSignatureInformations[n],
+                                                bAdESCompliant);
+
+        // Create a new one...
+        maSignatureHelper.CreateAndWriteSignature(xDocumentHandler, bAdESCompliant);
+
+        // That's it...
+        XMLSignatureHelper::CloseDocumentHandler(xDocumentHandler);
+    }
+    else
+    {
+        // OOXML
+
+        // Handle relations.
+        maSignatureHelper.EnsureSignaturesRelation(mxStore, /*bAdd=*/true);
+        // Old signatures + the new one.
+        int nSignatureCount = maCurrentSignatureInformations.size() + 1;
+        maSignatureHelper.ExportSignatureRelations(aStreamHelper.xSignatureStorage,
+                                                   nSignatureCount);
+
+        // Export old signatures.
+        for (std::size_t i = 0; i < maCurrentSignatureInformations.size(); ++i)
+            maSignatureHelper.ExportOOXMLSignature(mxStore, aStreamHelper.xSignatureStorage,
+                                                   maCurrentSignatureInformations[i], i + 1);
+
+        // Create a new signature.
+        maSignatureHelper.CreateAndWriteOOXMLSignature(mxStore, aStreamHelper.xSignatureStorage,
+                                                       nSignatureCount);
+
+        // Flush objects.
+        uno::Reference<embed::XTransactedObject> xTransact(aStreamHelper.xSignatureStorage,
+                                                           uno::UNO_QUERY);
+        xTransact->commit();
+        uno::Reference<io::XOutputStream> xOutputStream(aStreamHelper.xSignatureStream,
+                                                        uno::UNO_QUERY);
+        xOutputStream->closeOutput();
+
+        uno::Reference<io::XTempFile> xTempFile(aStreamHelper.xSignatureStream, uno::UNO_QUERY);
+        SAL_INFO("xmlsecurity.helper",
+                 "DocumentSignatureManager::add temporary storage at " << xTempFile->getUri());
+    }
+
+    maSignatureHelper.EndMission();
+    return true;
+}
+
+void DocumentSignatureManager::remove(sal_uInt16 nPosition)
+{
+    if (!mxStore.is())
+    {
+        // Something not ZIP based, try PDF.
+        uno::Reference<io::XInputStream> xInputStream(mxSignatureStream, uno::UNO_QUERY);
+        if (!PDFSignatureHelper::RemoveSignature(xInputStream, nPosition))
+        {
+            SAL_WARN("xmlsecurity.helper", "PDFSignatureHelper::RemoveSignature() failed");
+            return;
+        }
+
+        // Only erase when the removal was successful, it may fail for PDF.
+        // Also, erase the requested and all following signatures, as PDF signatures are always chained.
+        maCurrentSignatureInformations.erase(maCurrentSignatureInformations.begin() + nPosition,
+                                             maCurrentSignatureInformations.end());
+        return;
+    }
+
+    maCurrentSignatureInformations.erase(maCurrentSignatureInformations.begin() + nPosition);
+
+    // Export all other signatures...
+    SignatureStreamHelper aStreamHelper = ImplOpenSignatureStream(
+        embed::ElementModes::WRITE | embed::ElementModes::TRUNCATE, /*bTempStream=*/true);
+
+    if (aStreamHelper.nStorageFormat != embed::StorageFormats::OFOPXML)
+    {
+        uno::Reference<io::XOutputStream> xOutputStream(aStreamHelper.xSignatureStream,
+                                                        uno::UNO_QUERY_THROW);
+        uno::Reference<xml::sax::XWriter> xSaxWriter
+            = maSignatureHelper.CreateDocumentHandlerWithHeader(xOutputStream);
+
+        uno::Reference<xml::sax::XDocumentHandler> xDocumentHandler(xSaxWriter,
+                                                                    uno::UNO_QUERY_THROW);
+        std::size_t nInfos = maCurrentSignatureInformations.size();
+        for (std::size_t n = 0; n < nInfos; ++n)
+            XMLSignatureHelper::ExportSignature(xDocumentHandler, maCurrentSignatureInformations[n],
+                                                false /* ??? */);
+
+        XMLSignatureHelper::CloseDocumentHandler(xDocumentHandler);
+    }
+    else
+    {
+        // OOXML
+
+        // Handle relations.
+        int nSignatureCount = maCurrentSignatureInformations.size();
+        maSignatureHelper.ExportSignatureRelations(aStreamHelper.xSignatureStorage,
+                                                   nSignatureCount);
+
+        // Export old signatures.
+        for (std::size_t i = 0; i < maCurrentSignatureInformations.size(); ++i)
+            maSignatureHelper.ExportOOXMLSignature(mxStore, aStreamHelper.xSignatureStorage,
+                                                   maCurrentSignatureInformations[i], i + 1);
+
+        // Flush objects.
+        uno::Reference<embed::XTransactedObject> xTransact(aStreamHelper.xSignatureStorage,
+                                                           uno::UNO_QUERY);
+        xTransact->commit();
+        uno::Reference<io::XOutputStream> xOutputStream(aStreamHelper.xSignatureStream,
+                                                        uno::UNO_QUERY);
+        xOutputStream->closeOutput();
+
+        uno::Reference<io::XTempFile> xTempFile(aStreamHelper.xSignatureStream, uno::UNO_QUERY);
+        SAL_INFO("xmlsecurity.helper", "DocumentSignatureManager::remove: temporary storage is at "
+                                           << xTempFile->getUri());
+    }
+}
+
+void DocumentSignatureManager::read(bool bUseTempStream, bool bCacheLastSignature)
+{
+    maCurrentSignatureInformations.clear();
+
+    if (mxStore.is())
+    {
+        // ZIP-based: ODF or OOXML.
+        maSignatureHelper.StartMission(mxSecurityContext);
+
+        SignatureStreamHelper aStreamHelper
+            = ImplOpenSignatureStream(embed::ElementModes::READ, bUseTempStream);
+        if (aStreamHelper.nStorageFormat != embed::StorageFormats::OFOPXML
+            && aStreamHelper.xSignatureStream.is())
+        {
+            uno::Reference<io::XInputStream> xInputStream(aStreamHelper.xSignatureStream,
+                                                          uno::UNO_QUERY);
+            maSignatureHelper.ReadAndVerifySignature(xInputStream);
+        }
+        else if (aStreamHelper.nStorageFormat == embed::StorageFormats::OFOPXML
+                 && aStreamHelper.xSignatureStorage.is())
+            maSignatureHelper.ReadAndVerifySignatureStorage(aStreamHelper.xSignatureStorage,
+                                                            bCacheLastSignature);
+        maSignatureHelper.EndMission();
+
+        maCurrentSignatureInformations = maSignatureHelper.GetSignatureInformations();
+    }
+    else
+    {
+        // Something not ZIP based, try PDF.
+        uno::Reference<io::XInputStream> xInputStream(mxSignatureStream, uno::UNO_QUERY);
+        if (getPDFSignatureHelper().ReadAndVerifySignature(xInputStream))
+            maCurrentSignatureInformations = getPDFSignatureHelper().GetSignatureInformations();
+    }
+}
+
+void DocumentSignatureManager::write(bool bXAdESCompliantIfODF)
+{
+    if (!mxStore.is())
+    {
+        // Something not ZIP based, assume PDF, which is written directly in add() already.
+        return;
+    }
+
+    // Export all other signatures...
+    SignatureStreamHelper aStreamHelper = ImplOpenSignatureStream(
+        embed::ElementModes::WRITE | embed::ElementModes::TRUNCATE, false);
+
+    if (aStreamHelper.xSignatureStream.is()
+        && aStreamHelper.nStorageFormat != embed::StorageFormats::OFOPXML)
+    {
+        // ODF
+        uno::Reference<io::XOutputStream> xOutputStream(aStreamHelper.xSignatureStream,
+                                                        uno::UNO_QUERY);
+        uno::Reference<xml::sax::XWriter> xSaxWriter
+            = maSignatureHelper.CreateDocumentHandlerWithHeader(xOutputStream);
+
+        uno::Reference<xml::sax::XDocumentHandler> xDocumentHandler(xSaxWriter,
+                                                                    uno::UNO_QUERY_THROW);
+        std::size_t nInfos = maCurrentSignatureInformations.size();
+        for (std::size_t n = 0; n < nInfos; ++n)
+            XMLSignatureHelper::ExportSignature(xDocumentHandler, maCurrentSignatureInformations[n],
+                                                bXAdESCompliantIfODF);
+
+        XMLSignatureHelper::CloseDocumentHandler(xDocumentHandler);
+    }
+    else if (aStreamHelper.xSignatureStorage.is()
+             && aStreamHelper.nStorageFormat == embed::StorageFormats::OFOPXML)
+    {
+        // OOXML
+        std::size_t nSignatureCount = maCurrentSignatureInformations.size();
+        maSignatureHelper.ExportSignatureContentTypes(mxStore, nSignatureCount);
+        if (nSignatureCount > 0)
+            maSignatureHelper.ExportSignatureRelations(aStreamHelper.xSignatureStorage,
+                                                       nSignatureCount);
+        else
+        {
+            // Removing all signatures: then need to remove the signature relation as well.
+            maSignatureHelper.EnsureSignaturesRelation(mxStore, /*bAdd=*/false);
+            // Also remove the whole signature sub-storage: release our read-write reference + remove the element.
+            aStreamHelper = SignatureStreamHelper();
+            mxStore->removeElement("_xmlsignatures");
+        }
+
+        for (std::size_t i = 0; i < nSignatureCount; ++i)
+            maSignatureHelper.ExportOOXMLSignature(mxStore, aStreamHelper.xSignatureStorage,
+                                                   maCurrentSignatureInformations[i], i + 1);
+    }
+
+    // If stream was not provided, we are responsible for committing it...
+    if (!mxSignatureStream.is() && aStreamHelper.xSignatureStorage.is())
+    {
+        uno::Reference<embed::XTransactedObject> xTrans(aStreamHelper.xSignatureStorage,
+                                                        uno::UNO_QUERY);
+        xTrans->commit();
+    }
+}
+
+uno::Reference<xml::crypto::XSecurityEnvironment> DocumentSignatureManager::getSecurityEnvironment()
+{
+    return mxSecurityContext.is() ? mxSecurityContext->getSecurityEnvironment()
+                                  : uno::Reference<xml::crypto::XSecurityEnvironment>();
+}
+
+uno::Reference<xml::crypto::XSecurityEnvironment>
+DocumentSignatureManager::getGpgSecurityEnvironment()
+{
+    return mxGpgSecurityContext.is() ? mxGpgSecurityContext->getSecurityEnvironment()
+                                     : uno::Reference<xml::crypto::XSecurityEnvironment>();
+}
+
+uno::Reference<xml::crypto::XXMLSecurityContext> const&
+DocumentSignatureManager::getSecurityContext() const
+{
+    return mxSecurityContext;
+}
+
+uno::Reference<xml::crypto::XXMLSecurityContext> const&
+DocumentSignatureManager::getGpgSecurityContext() const
+{
+    return mxGpgSecurityContext;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/helper/ooxmlsecexporter.cxx b/xmlsecurity/source/helper/ooxmlsecexporter.cxx
new file mode 100644
index 000000000..fe4d0df89
--- /dev/null
+++ b/xmlsecurity/source/helper/ooxmlsecexporter.cxx
@@ -0,0 +1,546 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#include "ooxmlsecexporter.hxx"
+
+#include <algorithm>
+#include <memory>
+
+#include <com/sun/star/embed/ElementModes.hpp>
+#include <com/sun/star/embed/XHierarchicalStorageAccess.hpp>
+#include <com/sun/star/embed/XStorage.hpp>
+#include <com/sun/star/beans/StringPair.hpp>
+#include <com/sun/star/xml/sax/XDocumentHandler.hpp>
+
+#include <comphelper/ofopxmlhelper.hxx>
+#include <rtl/ref.hxx>
+#include <sal/log.hxx>
+#include <svx/xoutbmp.hxx>
+#include <unotools/datetime.hxx>
+#include <vcl/salctype.hxx>
+#include <xmloff/attrlist.hxx>
+
+#include <documentsignaturehelper.hxx>
+#include <xsecctl.hxx>
+
+using namespace com::sun::star;
+using namespace css::xml::sax;
+
+struct OOXMLSecExporter::Impl
+{
+private:
+    const uno::Reference<uno::XComponentContext>& m_xComponentContext;
+    const uno::Reference<embed::XStorage>& m_xRootStorage;
+    const uno::Reference<xml::sax::XDocumentHandler>& m_xDocumentHandler;
+    const SignatureInformation& m_rInformation;
+    OUString m_aSignatureTimeValue;
+
+public:
+    Impl(const uno::Reference<uno::XComponentContext>& xComponentContext,
+         const uno::Reference<embed::XStorage>& xRootStorage,
+         const uno::Reference<xml::sax::XDocumentHandler>& xDocumentHandler,
+         const SignatureInformation& rInformation)
+        : m_xComponentContext(xComponentContext)
+        , m_xRootStorage(xRootStorage)
+        , m_xDocumentHandler(xDocumentHandler)
+        , m_rInformation(rInformation)
+    {
+    }
+
+    /// Should we intentionally not sign this stream?
+    static bool isOOXMLBlacklist(const OUString& rStreamName);
+    /// Should we intentionally not sign this relation type?
+    static bool isOOXMLRelationBlacklist(const OUString& rRelationName);
+
+    const uno::Reference<xml::sax::XDocumentHandler>& getDocumentHandler() const
+    {
+        return m_xDocumentHandler;
+    }
+
+    void writeSignedInfo();
+    void writeCanonicalizationMethod();
+    void writeCanonicalizationTransform();
+    void writeSignatureMethod();
+    void writeSignedInfoReferences();
+    void writeSignatureValue();
+    void writeKeyInfo();
+    void writePackageObject();
+    void writeManifest();
+    void writeRelationshipTransform(const OUString& rURI);
+    /// Writes <SignatureProperties> inside idPackageObject.
+    void writePackageObjectSignatureProperties();
+    /// Writes a single <Reference> inside <Manifest>.
+    void writeManifestReference(const SignatureReferenceInformation& rReference);
+    void writeOfficeObject();
+    /// Writes <SignatureInfoV1>.
+    void writeSignatureInfo();
+    void writePackageSignature();
+    void writeSignatureLineImages();
+};
+
+bool OOXMLSecExporter::Impl::isOOXMLBlacklist(const OUString& rStreamName)
+{
+    static const std::initializer_list<OUStringLiteral> vBlacklist
+        = { "/%5BContent_Types%5D.xml", "/docProps/app.xml", "/docProps/core.xml",
+            // Don't attempt to sign other signatures for now.
+            "/_xmlsignatures" };
+    // Just check the prefix, as we don't care about the content type part of the stream name.
+    return std::any_of(vBlacklist.begin(), vBlacklist.end(), [&](const OUStringLiteral& rLiteral) {
+        return rStreamName.startsWith(rLiteral);
+    });
+}
+
+bool OOXMLSecExporter::Impl::isOOXMLRelationBlacklist(const OUString& rRelationName)
+{
+    static const std::initializer_list<OUStringLiteral> vBlacklist = {
+        "http://schemas.openxmlformats.org/officeDocument/2006/relationships/extended-properties",
+        "http://schemas.openxmlformats.org/package/2006/relationships/metadata/core-properties",
+        "http://schemas.openxmlformats.org/package/2006/relationships/digital-signature/origin"
+    };
+    return std::find(vBlacklist.begin(), vBlacklist.end(), rRelationName) != vBlacklist.end();
+}
+
+void OOXMLSecExporter::Impl::writeSignedInfo()
+{
+    m_xDocumentHandler->startElement(
+        "SignedInfo", uno::Reference<xml::sax::XAttributeList>(new SvXMLAttributeList()));
+
+    writeCanonicalizationMethod();
+    writeSignatureMethod();
+    writeSignedInfoReferences();
+
+    m_xDocumentHandler->endElement("SignedInfo");
+}
+
+void OOXMLSecExporter::Impl::writeCanonicalizationMethod()
+{
+    rtl::Reference<SvXMLAttributeList> pAttributeList(new SvXMLAttributeList());
+    pAttributeList->AddAttribute("Algorithm", ALGO_C14N);
+    m_xDocumentHandler->startElement(
+        "CanonicalizationMethod", uno::Reference<xml::sax::XAttributeList>(pAttributeList.get()));
+    m_xDocumentHandler->endElement("CanonicalizationMethod");
+}
+
+void OOXMLSecExporter::Impl::writeCanonicalizationTransform()
+{
+    rtl::Reference<SvXMLAttributeList> pAttributeList(new SvXMLAttributeList());
+    pAttributeList->AddAttribute("Algorithm", ALGO_C14N);
+    m_xDocumentHandler->startElement(
+        "Transform", uno::Reference<xml::sax::XAttributeList>(pAttributeList.get()));
+    m_xDocumentHandler->endElement("Transform");
+}
+
+void OOXMLSecExporter::Impl::writeSignatureMethod()
+{
+    rtl::Reference<SvXMLAttributeList> pAttributeList(new SvXMLAttributeList());
+
+    if (m_rInformation.eAlgorithmID == svl::crypto::SignatureMethodAlgorithm::ECDSA)
+        pAttributeList->AddAttribute("Algorithm", ALGO_ECDSASHA256);
+    else
+        pAttributeList->AddAttribute("Algorithm", ALGO_RSASHA256);
+
+    m_xDocumentHandler->startElement(
+        "SignatureMethod", uno::Reference<xml::sax::XAttributeList>(pAttributeList.get()));
+    m_xDocumentHandler->endElement("SignatureMethod");
+}
+
+void OOXMLSecExporter::Impl::writeSignedInfoReferences()
+{
+    const SignatureReferenceInformations& rReferences = m_rInformation.vSignatureReferenceInfors;
+    for (const SignatureReferenceInformation& rReference : rReferences)
+    {
+        if (rReference.nType == SignatureReferenceType::SAMEDOCUMENT)
+        {
+            {
+                rtl::Reference<SvXMLAttributeList> pAttributeList(new SvXMLAttributeList());
+                if (rReference.ouURI != "idSignedProperties")
+                    pAttributeList->AddAttribute("Type",
+                                                 "http://www.w3.org/2000/09/xmldsig#Object");
+                else
+                    pAttributeList->AddAttribute("Type",
+                                                 "http://uri.etsi.org/01903#SignedProperties");
+                pAttributeList->AddAttribute("URI", "#" + rReference.ouURI);
+                m_xDocumentHandler->startElement(
+                    "Reference", uno::Reference<xml::sax::XAttributeList>(pAttributeList.get()));
+            }
+            if (rReference.ouURI == "idSignedProperties")
+            {
+                m_xDocumentHandler->startElement(
+                    "Transforms",
+                    uno::Reference<xml::sax::XAttributeList>(new SvXMLAttributeList()));
+                writeCanonicalizationTransform();
+                m_xDocumentHandler->endElement("Transforms");
+            }
+
+            DocumentSignatureHelper::writeDigestMethod(m_xDocumentHandler);
+            m_xDocumentHandler->startElement(
+                "DigestValue", uno::Reference<xml::sax::XAttributeList>(new SvXMLAttributeList()));
+            m_xDocumentHandler->characters(rReference.ouDigestValue);
+            m_xDocumentHandler->endElement("DigestValue");
+            m_xDocumentHandler->endElement("Reference");
+        }
+    }
+}
+
+void OOXMLSecExporter::Impl::writeSignatureValue()
+{
+    m_xDocumentHandler->startElement(
+        "SignatureValue", uno::Reference<xml::sax::XAttributeList>(new SvXMLAttributeList()));
+    m_xDocumentHandler->characters(m_rInformation.ouSignatureValue);
+    m_xDocumentHandler->endElement("SignatureValue");
+}
+
+void OOXMLSecExporter::Impl::writeKeyInfo()
+{
+    m_xDocumentHandler->startElement(
+        "KeyInfo", uno::Reference<xml::sax::XAttributeList>(new SvXMLAttributeList()));
+    m_xDocumentHandler->startElement(
+        "X509Data", uno::Reference<xml::sax::XAttributeList>(new SvXMLAttributeList()));
+    m_xDocumentHandler->startElement(
+        "X509Certificate", uno::Reference<xml::sax::XAttributeList>(new SvXMLAttributeList()));
+    m_xDocumentHandler->characters(m_rInformation.ouX509Certificate);
+    m_xDocumentHandler->endElement("X509Certificate");
+    m_xDocumentHandler->endElement("X509Data");
+    m_xDocumentHandler->endElement("KeyInfo");
+}
+
+void OOXMLSecExporter::Impl::writePackageObject()
+{
+    rtl::Reference<SvXMLAttributeList> pAttributeList(new SvXMLAttributeList());
+    pAttributeList->AddAttribute("Id", "idPackageObject");
+    m_xDocumentHandler->startElement(
+        "Object", uno::Reference<xml::sax::XAttributeList>(pAttributeList.get()));
+
+    writeManifest();
+    writePackageObjectSignatureProperties();
+
+    m_xDocumentHandler->endElement("Object");
+}
+
+void OOXMLSecExporter::Impl::writeManifest()
+{
+    m_xDocumentHandler->startElement(
+        "Manifest", uno::Reference<xml::sax::XAttributeList>(new SvXMLAttributeList()));
+    const SignatureReferenceInformations& rReferences = m_rInformation.vSignatureReferenceInfors;
+    for (const SignatureReferenceInformation& rReference : rReferences)
+    {
+        if (rReference.nType != SignatureReferenceType::SAMEDOCUMENT)
+        {
+            if (OOXMLSecExporter::Impl::isOOXMLBlacklist(rReference.ouURI))
+                continue;
+
+            writeManifestReference(rReference);
+        }
+    }
+    m_xDocumentHandler->endElement("Manifest");
+}
+
+void OOXMLSecExporter::Impl::writeRelationshipTransform(const OUString& rURI)
+{
+    uno::Reference<embed::XHierarchicalStorageAccess> xHierarchicalStorageAccess(m_xRootStorage,
+                                                                                 uno::UNO_QUERY);
+    uno::Reference<io::XInputStream> xRelStream(
+        xHierarchicalStorageAccess->openStreamElementByHierarchicalName(rURI,
+                                                                        embed::ElementModes::READ),
+        uno::UNO_QUERY);
+    {
+        rtl::Reference<SvXMLAttributeList> pAttributeList(new SvXMLAttributeList());
+        pAttributeList->AddAttribute("Algorithm", ALGO_RELATIONSHIP);
+        m_xDocumentHandler->startElement(
+            "Transform", uno::Reference<xml::sax::XAttributeList>(pAttributeList.get()));
+    }
+
+    const uno::Sequence<uno::Sequence<beans::StringPair>> aRelationsInfo
+        = comphelper::OFOPXMLHelper::ReadRelationsInfoSequence(xRelStream, rURI,
+                                                               m_xComponentContext);
+    for (const uno::Sequence<beans::StringPair>& rPairs : aRelationsInfo)
+    {
+        OUString aId;
+        OUString aType;
+        for (const beans::StringPair& rPair : rPairs)
+        {
+            if (rPair.First == "Id")
+                aId = rPair.Second;
+            else if (rPair.First == "Type")
+                aType = rPair.Second;
+        }
+
+        if (OOXMLSecExporter::Impl::isOOXMLRelationBlacklist(aType))
+            continue;
+
+        rtl::Reference<SvXMLAttributeList> pAttributeList(new SvXMLAttributeList());
+        pAttributeList->AddAttribute("xmlns:mdssi", NS_MDSSI);
+        pAttributeList->AddAttribute("SourceId", aId);
+        m_xDocumentHandler->startElement(
+            "mdssi:RelationshipReference",
+            uno::Reference<xml::sax::XAttributeList>(pAttributeList.get()));
+        m_xDocumentHandler->endElement("mdssi:RelationshipReference");
+    }
+
+    m_xDocumentHandler->endElement("Transform");
+}
+
+void OOXMLSecExporter::Impl::writePackageObjectSignatureProperties()
+{
+    m_xDocumentHandler->startElement(
+        "SignatureProperties", uno::Reference<xml::sax::XAttributeList>(new SvXMLAttributeList()));
+    {
+        rtl::Reference<SvXMLAttributeList> pAttributeList(new SvXMLAttributeList());
+        pAttributeList->AddAttribute("Id", "idSignatureTime");
+        pAttributeList->AddAttribute("Target", "#idPackageSignature");
+        m_xDocumentHandler->startElement(
+            "SignatureProperty", uno::Reference<xml::sax::XAttributeList>(pAttributeList.get()));
+    }
+    {
+        rtl::Reference<SvXMLAttributeList> pAttributeList(new SvXMLAttributeList());
+        pAttributeList->AddAttribute("xmlns:mdssi", NS_MDSSI);
+        m_xDocumentHandler->startElement(
+            "mdssi:SignatureTime", uno::Reference<xml::sax::XAttributeList>(pAttributeList.get()));
+    }
+    m_xDocumentHandler->startElement(
+        "mdssi:Format", uno::Reference<xml::sax::XAttributeList>(new SvXMLAttributeList()));
+    m_xDocumentHandler->characters("YYYY-MM-DDThh:mm:ssTZD");
+    m_xDocumentHandler->endElement("mdssi:Format");
+
+    m_xDocumentHandler->startElement(
+        "mdssi:Value", uno::Reference<xml::sax::XAttributeList>(new SvXMLAttributeList()));
+    if (!m_rInformation.ouDateTime.isEmpty())
+        m_aSignatureTimeValue = m_rInformation.ouDateTime;
+    else
+    {
+        m_aSignatureTimeValue = utl::toISO8601(m_rInformation.stDateTime);
+        // Ignore sub-seconds.
+        sal_Int32 nCommaPos = m_aSignatureTimeValue.indexOf(',');
+        if (nCommaPos != -1)
+        {
+            m_aSignatureTimeValue = m_aSignatureTimeValue.copy(0, nCommaPos);
+            m_aSignatureTimeValue += "Z";
+        }
+    }
+    m_xDocumentHandler->characters(m_aSignatureTimeValue);
+    m_xDocumentHandler->endElement("mdssi:Value");
+
+    m_xDocumentHandler->endElement("mdssi:SignatureTime");
+    m_xDocumentHandler->endElement("SignatureProperty");
+    m_xDocumentHandler->endElement("SignatureProperties");
+}
+
+void OOXMLSecExporter::Impl::writeManifestReference(const SignatureReferenceInformation& rReference)
+{
+    rtl::Reference<SvXMLAttributeList> pAttributeList(new SvXMLAttributeList());
+    pAttributeList->AddAttribute("URI", rReference.ouURI);
+    m_xDocumentHandler->startElement(
+        "Reference", uno::Reference<xml::sax::XAttributeList>(pAttributeList.get()));
+
+    // Transforms
+    if (rReference.ouURI.endsWith(
+            "?ContentType=application/vnd.openxmlformats-package.relationships+xml"))
+    {
+        OUString aURI = rReference.ouURI;
+        // Ignore leading slash.
+        if (aURI.startsWith("/"))
+            aURI = aURI.copy(1);
+        // Ignore query part of the URI.
+        sal_Int32 nQueryPos = aURI.indexOf('?');
+        if (nQueryPos != -1)
+            aURI = aURI.copy(0, nQueryPos);
+
+        m_xDocumentHandler->startElement(
+            "Transforms", uno::Reference<xml::sax::XAttributeList>(new SvXMLAttributeList()));
+
+        writeRelationshipTransform(aURI);
+        writeCanonicalizationTransform();
+
+        m_xDocumentHandler->endElement("Transforms");
+    }
+
+    DocumentSignatureHelper::writeDigestMethod(m_xDocumentHandler);
+    m_xDocumentHandler->startElement(
+        "DigestValue", uno::Reference<xml::sax::XAttributeList>(new SvXMLAttributeList()));
+    m_xDocumentHandler->characters(rReference.ouDigestValue);
+    m_xDocumentHandler->endElement("DigestValue");
+    m_xDocumentHandler->endElement("Reference");
+}
+
+void OOXMLSecExporter::Impl::writeOfficeObject()
+{
+    {
+        rtl::Reference<SvXMLAttributeList> pAttributeList(new SvXMLAttributeList());
+        pAttributeList->AddAttribute("Id", "idOfficeObject");
+        m_xDocumentHandler->startElement(
+            "Object", uno::Reference<xml::sax::XAttributeList>(pAttributeList.get()));
+    }
+    m_xDocumentHandler->startElement(
+        "SignatureProperties", uno::Reference<xml::sax::XAttributeList>(new SvXMLAttributeList()));
+    {
+        rtl::Reference<SvXMLAttributeList> pAttributeList(new SvXMLAttributeList());
+        pAttributeList->AddAttribute("Id", "idOfficeV1Details");
+        pAttributeList->AddAttribute("Target", "#idPackageSignature");
+        m_xDocumentHandler->startElement(
+            "SignatureProperty", uno::Reference<xml::sax::XAttributeList>(pAttributeList.get()));
+    }
+    writeSignatureInfo();
+    m_xDocumentHandler->endElement("SignatureProperty");
+    m_xDocumentHandler->endElement("SignatureProperties");
+    m_xDocumentHandler->endElement("Object");
+}
+
+void OOXMLSecExporter::Impl::writeSignatureInfo()
+{
+    rtl::Reference<SvXMLAttributeList> pAttributeList(new SvXMLAttributeList());
+    pAttributeList->AddAttribute("xmlns", "http://schemas.microsoft.com/office/2006/digsig");
+    m_xDocumentHandler->startElement(
+        "SignatureInfoV1", uno::Reference<xml::sax::XAttributeList>(pAttributeList.get()));
+
+    m_xDocumentHandler->startElement(
+        "SetupID", uno::Reference<xml::sax::XAttributeList>(new SvXMLAttributeList()));
+    m_xDocumentHandler->characters(m_rInformation.ouSignatureLineId);
+    m_xDocumentHandler->endElement("SetupID");
+    m_xDocumentHandler->startElement(
+        "SignatureText", uno::Reference<xml::sax::XAttributeList>(new SvXMLAttributeList()));
+    m_xDocumentHandler->endElement("SignatureText");
+    m_xDocumentHandler->startElement(
+        "SignatureImage", uno::Reference<xml::sax::XAttributeList>(new SvXMLAttributeList()));
+    m_xDocumentHandler->endElement("SignatureImage");
+    m_xDocumentHandler->startElement(
+        "SignatureComments", uno::Reference<xml::sax::XAttributeList>(new SvXMLAttributeList()));
+    m_xDocumentHandler->characters(m_rInformation.ouDescription);
+    m_xDocumentHandler->endElement("SignatureComments");
+    // Just hardcode something valid according to [MS-OFFCRYPTO].
+    m_xDocumentHandler->startElement(
+        "WindowsVersion", uno::Reference<xml::sax::XAttributeList>(new SvXMLAttributeList()));
+    m_xDocumentHandler->characters("6.1");
+    m_xDocumentHandler->endElement("WindowsVersion");
+    m_xDocumentHandler->startElement(
+        "OfficeVersion", uno::Reference<xml::sax::XAttributeList>(new SvXMLAttributeList()));
+    m_xDocumentHandler->characters("16.0");
+    m_xDocumentHandler->endElement("OfficeVersion");
+    m_xDocumentHandler->startElement(
+        "ApplicationVersion", uno::Reference<xml::sax::XAttributeList>(new SvXMLAttributeList()));
+    m_xDocumentHandler->characters("16.0");
+    m_xDocumentHandler->endElement("ApplicationVersion");
+    m_xDocumentHandler->startElement(
+        "Monitors", uno::Reference<xml::sax::XAttributeList>(new SvXMLAttributeList()));
+    m_xDocumentHandler->characters("1");
+    m_xDocumentHandler->endElement("Monitors");
+    m_xDocumentHandler->startElement(
+        "HorizontalResolution", uno::Reference<xml::sax::XAttributeList>(new SvXMLAttributeList()));
+    m_xDocumentHandler->characters("1280");
+    m_xDocumentHandler->endElement("HorizontalResolution");
+    m_xDocumentHandler->startElement(
+        "VerticalResolution", uno::Reference<xml::sax::XAttributeList>(new SvXMLAttributeList()));
+    m_xDocumentHandler->characters("800");
+    m_xDocumentHandler->endElement("VerticalResolution");
+    m_xDocumentHandler->startElement(
+        "ColorDepth", uno::Reference<xml::sax::XAttributeList>(new SvXMLAttributeList()));
+    m_xDocumentHandler->characters("32");
+    m_xDocumentHandler->endElement("ColorDepth");
+    m_xDocumentHandler->startElement(
+        "SignatureProviderId", uno::Reference<xml::sax::XAttributeList>(new SvXMLAttributeList()));
+    m_xDocumentHandler->characters("{00000000-0000-0000-0000-000000000000}");
+    m_xDocumentHandler->endElement("SignatureProviderId");
+    m_xDocumentHandler->startElement(
+        "SignatureProviderUrl", uno::Reference<xml::sax::XAttributeList>(new SvXMLAttributeList()));
+    m_xDocumentHandler->endElement("SignatureProviderUrl");
+    m_xDocumentHandler->startElement(
+        "SignatureProviderDetails",
+        uno::Reference<xml::sax::XAttributeList>(new SvXMLAttributeList()));
+    m_xDocumentHandler->characters(
+        "9"); // This is what MSO 2016 writes, though [MS-OFFCRYPTO] doesn't document what the value means.
+    m_xDocumentHandler->endElement("SignatureProviderDetails");
+    m_xDocumentHandler->startElement(
+        "SignatureType", uno::Reference<xml::sax::XAttributeList>(new SvXMLAttributeList()));
+    m_xDocumentHandler->characters("2");
+    m_xDocumentHandler->endElement("SignatureType");
+
+    m_xDocumentHandler->endElement("SignatureInfoV1");
+}
+
+void OOXMLSecExporter::Impl::writePackageSignature()
+{
+    m_xDocumentHandler->startElement(
+        "Object", uno::Reference<xml::sax::XAttributeList>(new SvXMLAttributeList()));
+    {
+        rtl::Reference<SvXMLAttributeList> pAttributeList(new SvXMLAttributeList());
+        pAttributeList->AddAttribute("xmlns:xd", NS_XD);
+        pAttributeList->AddAttribute("Target", "#idPackageSignature");
+        m_xDocumentHandler->startElement(
+            "xd:QualifyingProperties",
+            uno::Reference<xml::sax::XAttributeList>(pAttributeList.get()));
+    }
+
+    DocumentSignatureHelper::writeSignedProperties(m_xDocumentHandler, m_rInformation,
+                                                   m_aSignatureTimeValue, false);
+
+    m_xDocumentHandler->endElement("xd:QualifyingProperties");
+    m_xDocumentHandler->endElement("Object");
+}
+
+void OOXMLSecExporter::Impl::writeSignatureLineImages()
+{
+    if (m_rInformation.aValidSignatureImage.is())
+    {
+        rtl::Reference<SvXMLAttributeList> pAttributeList(new SvXMLAttributeList());
+        pAttributeList->AddAttribute("Id", "idValidSigLnImg");
+        m_xDocumentHandler->startElement(
+            "Object", uno::Reference<xml::sax::XAttributeList>(pAttributeList.get()));
+        OUString aGraphicInBase64;
+        Graphic aGraphic(m_rInformation.aValidSignatureImage);
+        if (!XOutBitmap::GraphicToBase64(aGraphic, aGraphicInBase64, false, ConvertDataFormat::EMF))
+            SAL_WARN("xmlsecurity.helper", "could not convert graphic to base64");
+        m_xDocumentHandler->characters(aGraphicInBase64);
+        m_xDocumentHandler->endElement("Object");
+    }
+    if (m_rInformation.aInvalidSignatureImage.is())
+    {
+        rtl::Reference<SvXMLAttributeList> pAttributeList(new SvXMLAttributeList());
+        pAttributeList->AddAttribute("Id", "idInvalidSigLnImg");
+        m_xDocumentHandler->startElement(
+            "Object", uno::Reference<xml::sax::XAttributeList>(pAttributeList.get()));
+        OUString aGraphicInBase64;
+        Graphic aGraphic(m_rInformation.aInvalidSignatureImage);
+        if (!XOutBitmap::GraphicToBase64(aGraphic, aGraphicInBase64, false, ConvertDataFormat::EMF))
+            SAL_WARN("xmlsecurity.helper", "could not convert graphic to base64");
+        m_xDocumentHandler->characters(aGraphicInBase64);
+        m_xDocumentHandler->endElement("Object");
+    }
+}
+
+OOXMLSecExporter::OOXMLSecExporter(
+    const uno::Reference<uno::XComponentContext>& xComponentContext,
+    const uno::Reference<embed::XStorage>& xRootStorage,
+    const uno::Reference<xml::sax::XDocumentHandler>& xDocumentHandler,
+    const SignatureInformation& rInformation)
+    : m_pImpl(
+          std::make_unique<Impl>(xComponentContext, xRootStorage, xDocumentHandler, rInformation))
+{
+}
+
+OOXMLSecExporter::~OOXMLSecExporter() = default;
+
+void OOXMLSecExporter::writeSignature()
+{
+    rtl::Reference<SvXMLAttributeList> pAttributeList(new SvXMLAttributeList());
+    pAttributeList->AddAttribute("xmlns", NS_XMLDSIG);
+    pAttributeList->AddAttribute("Id", "idPackageSignature");
+    m_pImpl->getDocumentHandler()->startElement(
+        "Signature", uno::Reference<xml::sax::XAttributeList>(pAttributeList.get()));
+
+    m_pImpl->writeSignedInfo();
+    m_pImpl->writeSignatureValue();
+    m_pImpl->writeKeyInfo();
+    m_pImpl->writePackageObject();
+    m_pImpl->writeOfficeObject();
+    m_pImpl->writePackageSignature();
+    m_pImpl->writeSignatureLineImages();
+
+    m_pImpl->getDocumentHandler()->endElement("Signature");
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/helper/ooxmlsecexporter.hxx b/xmlsecurity/source/helper/ooxmlsecexporter.hxx
new file mode 100644
index 000000000..5d94da2fd
--- /dev/null
+++ b/xmlsecurity/source/helper/ooxmlsecexporter.hxx
@@ -0,0 +1,59 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#ifndef INCLUDED_XMLSECURITY_SOURCE_HELPER_OOXMLSECEXPORTER_HXX
+#define INCLUDED_XMLSECURITY_SOURCE_HELPER_OOXMLSECEXPORTER_HXX
+
+#include <memory>
+
+#include <svl/sigstruct.hxx>
+
+namespace com
+{
+namespace sun
+{
+namespace star
+{
+namespace embed
+{
+class XStorage;
+}
+namespace uno
+{
+class XComponentContext;
+}
+namespace xml
+{
+namespace sax
+{
+class XDocumentHandler;
+}
+}
+}
+}
+}
+
+/// Writes a single OOXML digital signature.
+class OOXMLSecExporter
+{
+    struct Impl;
+    std::unique_ptr<Impl> m_pImpl;
+
+public:
+    OOXMLSecExporter(const css::uno::Reference<css::uno::XComponentContext>& xComponentContext,
+                     const css::uno::Reference<css::embed::XStorage>& xRootStorage,
+                     const css::uno::Reference<css::xml::sax::XDocumentHandler>& xDocumentHandler,
+                     const SignatureInformation& rInformation);
+    ~OOXMLSecExporter();
+    void writeSignature();
+};
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/helper/ooxmlsecparser.cxx b/xmlsecurity/source/helper/ooxmlsecparser.cxx
new file mode 100644
index 000000000..c22e8c226
--- /dev/null
+++ b/xmlsecurity/source/helper/ooxmlsecparser.cxx
@@ -0,0 +1,293 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+
+#include "ooxmlsecparser.hxx"
+#include <xmlsignaturehelper.hxx>
+#include <xsecctl.hxx>
+#include <sal/log.hxx>
+
+using namespace com::sun::star;
+
+OOXMLSecParser::OOXMLSecParser(XMLSignatureHelper& rXMLSignatureHelper, XSecController* pXSecController)
+    : m_pXSecController(pXSecController)
+    ,m_bInDigestValue(false)
+    ,m_bInSignatureValue(false)
+    ,m_bInX509Certificate(false)
+    ,m_bInMdssiValue(false)
+    ,m_bInSignatureComments(false)
+    ,m_bInX509IssuerName(false)
+    ,m_bInX509SerialNumber(false)
+    ,m_bInCertDigest(false)
+    ,m_bInValidSignatureImage(false)
+    ,m_bInInvalidSignatureImage(false)
+    ,m_bInSignatureLineId(false)
+    ,m_bReferenceUnresolved(false)
+    ,m_rXMLSignatureHelper(rXMLSignatureHelper)
+{
+}
+
+OOXMLSecParser::~OOXMLSecParser()
+{
+}
+
+void SAL_CALL OOXMLSecParser::startDocument()
+{
+    if (m_xNextHandler.is())
+        m_xNextHandler->startDocument();
+}
+
+void SAL_CALL OOXMLSecParser::endDocument()
+{
+    if (m_xNextHandler.is())
+        m_xNextHandler->endDocument();
+}
+
+void SAL_CALL OOXMLSecParser::startElement(const OUString& rName, const uno::Reference<xml::sax::XAttributeList>& xAttribs)
+{
+    OUString aId = xAttribs->getValueByName("Id");
+    if (!aId.isEmpty())
+        m_pXSecController->collectToVerify(aId);
+
+    if (rName == "Signature")
+    {
+        m_rXMLSignatureHelper.StartVerifySignatureElement();
+        m_pXSecController->addSignature();
+        if (!aId.isEmpty())
+            m_pXSecController->setId(aId);
+    }
+    else if (rName == "SignatureMethod")
+    {
+        OUString ouAlgorithm = xAttribs->getValueByName("Algorithm");
+        if (ouAlgorithm == ALGO_ECDSASHA1 || ouAlgorithm == ALGO_ECDSASHA256
+            || ouAlgorithm == ALGO_ECDSASHA512)
+            m_pXSecController->setSignatureMethod(svl::crypto::SignatureMethodAlgorithm::ECDSA);
+    }
+    else if (rName == "Reference")
+    {
+        OUString aURI = xAttribs->getValueByName("URI");
+        if (aURI.startsWith("#"))
+            m_pXSecController->addReference(aURI.copy(1), xml::crypto::DigestID::SHA1, OUString());
+        else
+        {
+            m_aReferenceURI = aURI;
+            m_bReferenceUnresolved = true;
+        }
+    }
+    else if (rName == "Transform")
+    {
+        if (m_bReferenceUnresolved)
+        {
+            OUString aAlgorithm = xAttribs->getValueByName("Algorithm");
+            if (aAlgorithm == ALGO_RELATIONSHIP)
+            {
+                m_pXSecController->addStreamReference(m_aReferenceURI, /*isBinary=*/false, /*nDigestID=*/xml::crypto::DigestID::SHA256);
+                m_bReferenceUnresolved = false;
+            }
+        }
+    }
+    else if (rName == "DigestValue" && !m_bInCertDigest)
+    {
+        m_aDigestValue.clear();
+        m_bInDigestValue = true;
+    }
+    else if (rName == "SignatureValue")
+    {
+        m_aSignatureValue.clear();
+        m_bInSignatureValue = true;
+    }
+    else if (rName == "X509Certificate")
+    {
+        m_aX509Certificate.clear();
+        m_bInX509Certificate = true;
+    }
+    else if (rName == "mdssi:Value")
+    {
+        m_aMdssiValue.clear();
+        m_bInMdssiValue = true;
+    }
+    else if (rName == "SignatureComments")
+    {
+        m_aSignatureComments.clear();
+        m_bInSignatureComments = true;
+    }
+    else if (rName == "X509IssuerName")
+    {
+        m_aX509IssuerName.clear();
+        m_bInX509IssuerName = true;
+    }
+    else if (rName == "X509SerialNumber")
+    {
+        m_aX509SerialNumber.clear();
+        m_bInX509SerialNumber = true;
+    }
+    else if (rName == "xd:CertDigest")
+    {
+        m_aCertDigest.clear();
+        m_bInCertDigest = true;
+    }
+    else if (rName == "Object")
+    {
+        OUString sId = xAttribs->getValueByName("Id");
+        if (sId == "idValidSigLnImg")
+        {
+            m_aValidSignatureImage.clear();
+            m_bInValidSignatureImage = true;
+        }
+        else if (sId == "idInvalidSigLnImg")
+        {
+            m_aInvalidSignatureImage.clear();
+            m_bInInvalidSignatureImage = true;
+        }
+        else
+        {
+            SAL_INFO("xmlsecurity.ooxml", "Unknown 'Object' child element: " << rName);
+        }
+    }
+    else if (rName == "SetupID")
+    {
+        m_aSignatureLineId.clear();
+        m_bInSignatureLineId = true;
+    }
+    else
+    {
+        SAL_INFO("xmlsecurity.ooxml", "Unknown xml element: " << rName);
+    }
+
+    if (m_xNextHandler.is())
+        m_xNextHandler->startElement(rName, xAttribs);
+}
+
+void SAL_CALL OOXMLSecParser::endElement(const OUString& rName)
+{
+    if (rName == "SignedInfo")
+        m_pXSecController->setReferenceCount();
+    else if (rName == "Reference")
+    {
+        if (m_bReferenceUnresolved)
+        {
+            // No transform algorithm found, assume binary.
+            m_pXSecController->addStreamReference(m_aReferenceURI, /*isBinary=*/true, /*nDigestID=*/xml::crypto::DigestID::SHA256);
+            m_bReferenceUnresolved = false;
+        }
+        m_pXSecController->setDigestValue(xml::crypto::DigestID::SHA256, m_aDigestValue);
+    }
+    else if (rName == "DigestValue" && !m_bInCertDigest)
+        m_bInDigestValue = false;
+    else if (rName == "SignatureValue")
+    {
+        m_pXSecController->setSignatureValue(m_aSignatureValue);
+        m_bInSignatureValue = false;
+    }
+    else if (rName == "X509Certificate")
+    {
+        m_pXSecController->setX509Certificate(m_aX509Certificate);
+        m_bInX509Certificate = false;
+    }
+    else if (rName == "mdssi:Value")
+    {
+        m_pXSecController->setDate(m_aMdssiValue);
+        m_bInMdssiValue = false;
+    }
+    else if (rName == "SignatureComments")
+    {
+        m_pXSecController->setDescription(m_aSignatureComments);
+        m_bInSignatureComments = false;
+    }
+    else if (rName == "X509IssuerName")
+    {
+        m_pXSecController->setX509IssuerName(m_aX509IssuerName);
+        m_bInX509IssuerName = false;
+    }
+    else if (rName == "X509SerialNumber")
+    {
+        m_pXSecController->setX509SerialNumber(m_aX509SerialNumber);
+        m_bInX509SerialNumber = false;
+    }
+    else if (rName == "xd:CertDigest")
+    {
+        m_pXSecController->setCertDigest(m_aCertDigest);
+        m_bInCertDigest = false;
+    }
+    else if (rName == "Object")
+    {
+        if (m_bInValidSignatureImage)
+        {
+            m_pXSecController->setValidSignatureImage(m_aValidSignatureImage);
+            m_bInValidSignatureImage = false;
+        }
+        else if (m_bInInvalidSignatureImage)
+        {
+            m_pXSecController->setInvalidSignatureImage(m_aInvalidSignatureImage);
+            m_bInInvalidSignatureImage = false;
+        }
+    }
+    else if (rName == "SetupID")
+    {
+        m_pXSecController->setSignatureLineId(m_aSignatureLineId);
+        m_bInSignatureLineId = false;
+    }
+
+    if (m_xNextHandler.is())
+        m_xNextHandler->endElement(rName);
+}
+
+void SAL_CALL OOXMLSecParser::characters(const OUString& rChars)
+{
+    if (m_bInDigestValue && !m_bInCertDigest)
+        m_aDigestValue += rChars;
+    else if (m_bInSignatureValue)
+        m_aSignatureValue += rChars;
+    else if (m_bInX509Certificate)
+        m_aX509Certificate += rChars;
+    else if (m_bInMdssiValue)
+        m_aMdssiValue += rChars;
+    else if (m_bInSignatureComments)
+        m_aSignatureComments += rChars;
+    else if (m_bInX509IssuerName)
+        m_aX509IssuerName += rChars;
+    else if (m_bInX509SerialNumber)
+        m_aX509SerialNumber += rChars;
+    else if (m_bInCertDigest)
+        m_aCertDigest += rChars;
+    else if (m_bInValidSignatureImage)
+        m_aValidSignatureImage += rChars;
+    else if (m_bInInvalidSignatureImage)
+        m_aInvalidSignatureImage += rChars;
+    else if (m_bInSignatureLineId)
+        m_aSignatureLineId += rChars;
+
+    if (m_xNextHandler.is())
+        m_xNextHandler->characters(rChars);
+}
+
+void SAL_CALL OOXMLSecParser::ignorableWhitespace(const OUString& rWhitespace)
+{
+    if (m_xNextHandler.is())
+        m_xNextHandler->ignorableWhitespace(rWhitespace);
+}
+
+void SAL_CALL OOXMLSecParser::processingInstruction(const OUString& rTarget, const OUString& rData)
+{
+    if (m_xNextHandler.is())
+        m_xNextHandler->processingInstruction(rTarget, rData);
+}
+
+void SAL_CALL OOXMLSecParser::setDocumentLocator(const uno::Reference<xml::sax::XLocator>& xLocator)
+{
+    if (m_xNextHandler.is())
+        m_xNextHandler->setDocumentLocator(xLocator);
+}
+
+void SAL_CALL OOXMLSecParser::initialize(const uno::Sequence<uno::Any>& rArguments)
+{
+    rArguments[0] >>= m_xNextHandler;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/helper/ooxmlsecparser.hxx b/xmlsecurity/source/helper/ooxmlsecparser.hxx
new file mode 100644
index 000000000..d3c199147
--- /dev/null
+++ b/xmlsecurity/source/helper/ooxmlsecparser.hxx
@@ -0,0 +1,87 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#ifndef INCLUDED_XMLSECURITY_SOURCE_HELPER_OOXMLSECPARSER_HXX
+#define INCLUDED_XMLSECURITY_SOURCE_HELPER_OOXMLSECPARSER_HXX
+
+#include <com/sun/star/lang/XInitialization.hpp>
+#include <com/sun/star/xml/sax/XDocumentHandler.hpp>
+
+#include <cppuhelper/implbase.hxx>
+
+class XSecController;
+class XMLSignatureHelper;
+
+/// Parses an OOXML digital signature.
+class OOXMLSecParser: public cppu::WeakImplHelper
+    <
+    css::xml::sax::XDocumentHandler,
+    css::lang::XInitialization
+    >
+{
+    XSecController* m_pXSecController;
+    css::uno::Reference<css::xml::sax::XDocumentHandler> m_xNextHandler;
+
+    bool m_bInDigestValue;
+    OUString m_aDigestValue;
+    bool m_bInSignatureValue;
+    OUString m_aSignatureValue;
+    bool m_bInX509Certificate;
+    OUString m_aX509Certificate;
+    bool m_bInMdssiValue;
+    OUString m_aMdssiValue;
+    bool m_bInSignatureComments;
+    OUString m_aSignatureComments;
+    bool m_bInX509IssuerName;
+    OUString m_aX509IssuerName;
+    bool m_bInX509SerialNumber;
+    OUString m_aX509SerialNumber;
+    bool m_bInCertDigest;
+    OUString m_aCertDigest;
+    bool m_bInValidSignatureImage;
+    OUString m_aValidSignatureImage;
+    bool m_bInInvalidSignatureImage;
+    OUString m_aInvalidSignatureImage;
+    bool m_bInSignatureLineId;
+    OUString m_aSignatureLineId;
+
+    /// Last seen <Reference URI="...">.
+    OUString m_aReferenceURI;
+    /// Already called addStreamReference() for this reference.
+    bool m_bReferenceUnresolved;
+    XMLSignatureHelper& m_rXMLSignatureHelper;
+
+public:
+    explicit OOXMLSecParser(XMLSignatureHelper& rXMLSignatureHelper, XSecController* pXSecController);
+    virtual ~OOXMLSecParser() override;
+
+    // XDocumentHandler
+    virtual void SAL_CALL startDocument() override;
+
+    virtual void SAL_CALL endDocument() override;
+
+    virtual void SAL_CALL startElement(const OUString& aName, const css::uno::Reference<css::xml::sax::XAttributeList>& xAttribs) override;
+
+    virtual void SAL_CALL endElement(const OUString& aName) override;
+
+    virtual void SAL_CALL characters(const OUString& aChars) override;
+
+    virtual void SAL_CALL ignorableWhitespace(const OUString& aWhitespaces) override;
+
+    virtual void SAL_CALL processingInstruction(const OUString& aTarget, const OUString& aData) override;
+
+    virtual void SAL_CALL setDocumentLocator(const css::uno::Reference<css::xml::sax::XLocator>& xLocator) override;
+
+    // XInitialization
+    virtual void SAL_CALL initialize(const css::uno::Sequence<css::uno::Any>& rArguments) override;
+};
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/helper/pdfsignaturehelper.cxx b/xmlsecurity/source/helper/pdfsignaturehelper.cxx
new file mode 100644
index 000000000..b0795cb8f
--- /dev/null
+++ b/xmlsecurity/source/helper/pdfsignaturehelper.cxx
@@ -0,0 +1,187 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#include <pdfsignaturehelper.hxx>
+
+#include <memory>
+
+#include <com/sun/star/io/XTruncate.hpp>
+#include <com/sun/star/io/XStream.hpp>
+#include <com/sun/star/security/CertificateValidity.hpp>
+#include <com/sun/star/uno/SecurityException.hpp>
+#include <com/sun/star/security/DocumentSignatureInformation.hpp>
+#include <com/sun/star/xml/crypto/XSecurityEnvironment.hpp>
+
+#include <unotools/ucbstreamhelper.hxx>
+#include <vcl/filter/pdfdocument.hxx>
+
+#include <pdfio/pdfdocument.hxx>
+#include <tools/diagnose_ex.h>
+#include <sal/log.hxx>
+
+using namespace ::com::sun::star;
+
+PDFSignatureHelper::PDFSignatureHelper() = default;
+
+bool PDFSignatureHelper::ReadAndVerifySignature(
+    const uno::Reference<io::XInputStream>& xInputStream)
+{
+    if (!xInputStream.is())
+    {
+        SAL_WARN("xmlsecurity.helper", "input stream missing");
+        return false;
+    }
+
+    std::unique_ptr<SvStream> pStream(utl::UcbStreamHelper::CreateStream(xInputStream, true));
+    vcl::filter::PDFDocument aDocument;
+    if (!aDocument.Read(*pStream))
+    {
+        SAL_WARN("xmlsecurity.helper", "failed to read the document");
+        return false;
+    }
+
+    std::vector<vcl::filter::PDFObjectElement*> aSignatures = aDocument.GetSignatureWidgets();
+    if (aSignatures.empty())
+        return true;
+
+    m_aSignatureInfos.clear();
+
+    int nMDPPerm = aDocument.GetMDPPerm();
+
+    for (size_t i = 0; i < aSignatures.size(); ++i)
+    {
+        SignatureInformation aInfo(i);
+
+        if (!xmlsecurity::pdfio::ValidateSignature(*pStream, aSignatures[i], aInfo, aDocument,
+                                                   nMDPPerm))
+            SAL_WARN("xmlsecurity.helper", "failed to determine digest match");
+
+        m_aSignatureInfos.push_back(aInfo);
+    }
+
+    return true;
+}
+
+SignatureInformations const& PDFSignatureHelper::GetSignatureInformations() const
+{
+    return m_aSignatureInfos;
+}
+
+uno::Sequence<security::DocumentSignatureInformation>
+PDFSignatureHelper::GetDocumentSignatureInformations(
+    const uno::Reference<xml::crypto::XSecurityEnvironment>& xSecEnv) const
+{
+    uno::Sequence<security::DocumentSignatureInformation> aRet(m_aSignatureInfos.size());
+
+    for (size_t i = 0; i < m_aSignatureInfos.size(); ++i)
+    {
+        const SignatureInformation& rInternal = m_aSignatureInfos[i];
+        security::DocumentSignatureInformation& rExternal = aRet[i];
+        rExternal.SignatureIsValid
+            = rInternal.nStatus == xml::crypto::SecurityOperationStatus_OPERATION_SUCCEEDED;
+        if (!rInternal.ouX509Certificate.isEmpty())
+            rExternal.Signer = xSecEnv->createCertificateFromAscii(rInternal.ouX509Certificate);
+        rExternal.PartialDocumentSignature = rInternal.bPartialDocumentSignature;
+
+        // Verify certificate.
+        if (rExternal.Signer.is())
+        {
+            try
+            {
+                rExternal.CertificateStatus = xSecEnv->verifyCertificate(rExternal.Signer, {});
+            }
+            catch (const uno::SecurityException&)
+            {
+                DBG_UNHANDLED_EXCEPTION("xmlsecurity.helper", "failed to verify certificate");
+                rExternal.CertificateStatus = security::CertificateValidity::INVALID;
+            }
+        }
+        else
+            rExternal.CertificateStatus = security::CertificateValidity::INVALID;
+    }
+
+    return aRet;
+}
+
+sal_Int32 PDFSignatureHelper::GetNewSecurityId() const { return m_aSignatureInfos.size(); }
+
+void PDFSignatureHelper::SetX509Certificate(
+    const uno::Reference<security::XCertificate>& xCertificate)
+{
+    m_xCertificate = xCertificate;
+}
+
+void PDFSignatureHelper::SetDescription(const OUString& rDescription)
+{
+    m_aDescription = rDescription;
+}
+
+bool PDFSignatureHelper::Sign(const uno::Reference<io::XInputStream>& xInputStream, bool bAdES)
+{
+    std::unique_ptr<SvStream> pStream(utl::UcbStreamHelper::CreateStream(xInputStream, true));
+    vcl::filter::PDFDocument aDocument;
+    if (!aDocument.Read(*pStream))
+    {
+        SAL_WARN("xmlsecurity.helper", "failed to read the document");
+        return false;
+    }
+
+    if (!aDocument.Sign(m_xCertificate, m_aDescription, bAdES))
+    {
+        SAL_WARN("xmlsecurity.helper", "failed to sign");
+        return false;
+    }
+
+    uno::Reference<io::XStream> xStream(xInputStream, uno::UNO_QUERY);
+    std::unique_ptr<SvStream> pOutStream(utl::UcbStreamHelper::CreateStream(xStream, true));
+    if (!aDocument.Write(*pOutStream))
+    {
+        SAL_WARN("xmlsecurity.helper", "failed to write signed data");
+        return false;
+    }
+
+    return true;
+}
+
+bool PDFSignatureHelper::RemoveSignature(const uno::Reference<io::XInputStream>& xInputStream,
+                                         sal_uInt16 nPosition)
+{
+    std::unique_ptr<SvStream> pStream(utl::UcbStreamHelper::CreateStream(xInputStream, true));
+    vcl::filter::PDFDocument aDocument;
+    if (!aDocument.Read(*pStream))
+    {
+        SAL_WARN("xmlsecurity.helper", "failed to read the document");
+        return false;
+    }
+
+    if (!aDocument.RemoveSignature(nPosition))
+    {
+        SAL_WARN("xmlsecurity.helper", "failed to remove signature");
+        return false;
+    }
+
+    uno::Reference<io::XStream> xStream(xInputStream, uno::UNO_QUERY);
+    uno::Reference<io::XTruncate> xTruncate(xStream, uno::UNO_QUERY);
+    if (!xTruncate.is())
+    {
+        SAL_WARN("xmlsecurity.helper", "failed to truncate");
+        return false;
+    }
+    xTruncate->truncate();
+    std::unique_ptr<SvStream> pOutStream(utl::UcbStreamHelper::CreateStream(xStream, true));
+    if (!aDocument.Write(*pOutStream))
+    {
+        SAL_WARN("xmlsecurity.helper", "failed to write without signature");
+        return false;
+    }
+
+    return true;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/helper/xmlsignaturehelper.cxx b/xmlsecurity/source/helper/xmlsignaturehelper.cxx
new file mode 100644
index 000000000..6ec834053
--- /dev/null
+++ b/xmlsecurity/source/helper/xmlsignaturehelper.cxx
@@ -0,0 +1,549 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+
+#include <xmlsignaturehelper.hxx>
+#include <documentsignaturehelper.hxx>
+#include <xsecctl.hxx>
+
+#include <xmlsignaturehelper2.hxx>
+
+#include <tools/datetime.hxx>
+
+#include <xmloff/attrlist.hxx>
+
+#include <com/sun/star/io/XOutputStream.hpp>
+#include <com/sun/star/io/XInputStream.hpp>
+#include <com/sun/star/io/XTruncate.hpp>
+#include <com/sun/star/beans/XPropertySet.hpp>
+#include <com/sun/star/beans/StringPair.hpp>
+#include <com/sun/star/xml/sax/Parser.hpp>
+#include <com/sun/star/xml/sax/Writer.hpp>
+#include <com/sun/star/embed/ElementModes.hpp>
+#include <com/sun/star/embed/XStorage.hpp>
+#include <com/sun/star/embed/StorageFormats.hpp>
+#include <com/sun/star/embed/XTransactedObject.hpp>
+
+#include <comphelper/ofopxmlhelper.hxx>
+#include <comphelper/sequence.hxx>
+#include <tools/diagnose_ex.h>
+#include <sal/log.hxx>
+
+#define NS_DOCUMENTSIGNATURES   "http://openoffice.org/2004/documentsignatures"
+#define NS_DOCUMENTSIGNATURES_ODF_1_2 "urn:oasis:names:tc:opendocument:xmlns:digitalsignature:1.0"
+#define OOXML_SIGNATURE_ORIGIN "http://schemas.openxmlformats.org/package/2006/relationships/digital-signature/origin"
+#define OOXML_SIGNATURE_SIGNATURE "http://schemas.openxmlformats.org/package/2006/relationships/digital-signature/signature"
+
+using namespace ::com::sun::star;
+using namespace ::com::sun::star::graphic;
+using namespace ::com::sun::star::uno;
+
+XMLSignatureHelper::XMLSignatureHelper( const uno::Reference< uno::XComponentContext >& rxCtx)
+    : mxCtx(rxCtx), mbODFPre1_2(false)
+{
+    mpXSecController = new XSecController(rxCtx);
+    mbError = false;
+}
+
+XMLSignatureHelper::~XMLSignatureHelper()
+{
+}
+
+void XMLSignatureHelper::SetStorage(
+    const Reference < css::embed::XStorage >& rxStorage,
+    const OUString& sODFVersion)
+{
+    SAL_WARN_IF( mxUriBinding.is(), "xmlsecurity.helper", "SetStorage - UriBinding already set!" );
+    mxUriBinding = new UriBindingHelper( rxStorage );
+    SAL_WARN_IF(!rxStorage.is(), "xmlsecurity.helper", "SetStorage - empty storage!");
+    mbODFPre1_2 = DocumentSignatureHelper::isODFPre_1_2(sODFVersion);
+}
+
+
+void XMLSignatureHelper::SetStartVerifySignatureHdl( const Link<LinkParamNone*,bool>& rLink )
+{
+    maStartVerifySignatureHdl = rLink;
+}
+
+
+void XMLSignatureHelper::StartMission(const uno::Reference<xml::crypto::XXMLSecurityContext>& xSecurityContext)
+{
+    if ( !mxUriBinding.is() )
+        mxUriBinding = new UriBindingHelper();
+
+    mpXSecController->startMission(mxUriBinding, xSecurityContext);
+}
+
+void XMLSignatureHelper::EndMission()
+{
+    mpXSecController->endMission();
+}
+
+sal_Int32 XMLSignatureHelper::GetNewSecurityId()
+{
+    return mpXSecController->getNewSecurityId();
+}
+
+void XMLSignatureHelper::SetX509Certificate(
+        sal_Int32 nSecurityId,
+        const OUString& ouX509IssuerName,
+        const OUString& ouX509SerialNumber,
+        const OUString& ouX509Cert,
+        const OUString& ouX509CertDigest,
+        svl::crypto::SignatureMethodAlgorithm eAlgorithmID)
+{
+    mpXSecController->setX509Certificate(
+        nSecurityId,
+        ouX509IssuerName,
+        ouX509SerialNumber,
+        ouX509Cert,
+        ouX509CertDigest,
+        eAlgorithmID);
+}
+
+void XMLSignatureHelper::AddEncapsulatedX509Certificate(const OUString& ouEncapsulatedX509Certificate)
+{
+    mpXSecController->addEncapsulatedX509Certificate(ouEncapsulatedX509Certificate);
+}
+
+void XMLSignatureHelper::SetGpgCertificate(sal_Int32 nSecurityId,
+                                           const OUString& ouGpgCertDigest,
+                                           const OUString& ouGpgCert,
+                                           const OUString& ouGpgOwner)
+{
+    mpXSecController->setGpgCertificate(
+        nSecurityId,
+        ouGpgCertDigest,
+        ouGpgCert,
+        ouGpgOwner);
+}
+
+void XMLSignatureHelper::SetDateTime( sal_Int32 nSecurityId, const ::DateTime& rDateTime )
+{
+    css::util::DateTime stDateTime = rDateTime.GetUNODateTime();
+    mpXSecController->setDate( nSecurityId, stDateTime );
+}
+
+void XMLSignatureHelper::SetDescription(sal_Int32 nSecurityId, const OUString& rDescription)
+{
+    mpXSecController->setDescription(nSecurityId, rDescription);
+}
+
+void XMLSignatureHelper::SetSignatureLineId(sal_Int32 nSecurityId, const OUString& rSignatureLineId)
+{
+    mpXSecController->setSignatureLineId(nSecurityId, rSignatureLineId);
+}
+
+void XMLSignatureHelper::SetSignatureLineValidGraphic(
+    sal_Int32 nSecurityId, const css::uno::Reference<XGraphic>& xValidGraphic)
+{
+    mpXSecController->setSignatureLineValidGraphic(nSecurityId, xValidGraphic);
+}
+
+void XMLSignatureHelper::SetSignatureLineInvalidGraphic(
+    sal_Int32 nSecurityId, const css::uno::Reference<XGraphic>& xInvalidGraphic)
+{
+    mpXSecController->setSignatureLineInvalidGraphic(nSecurityId, xInvalidGraphic);
+}
+
+void XMLSignatureHelper::AddForSigning( sal_Int32 nSecurityId, const OUString& uri, bool bBinary, bool bXAdESCompliantIfODF )
+{
+    mpXSecController->signAStream( nSecurityId, uri, bBinary, bXAdESCompliantIfODF );
+}
+
+
+uno::Reference<xml::sax::XWriter> XMLSignatureHelper::CreateDocumentHandlerWithHeader(
+    const css::uno::Reference< css::io::XOutputStream >& xOutputStream )
+{
+    /*
+     * get SAX writer component
+     */
+    uno::Reference< xml::sax::XWriter > xSaxWriter = xml::sax::Writer::create(mxCtx);
+
+    /*
+     * connect XML writer to output stream
+     */
+    xSaxWriter->setOutputStream( xOutputStream );
+
+    /*
+     * write the xml context for signatures
+     */
+    SvXMLAttributeList *pAttributeList = new SvXMLAttributeList();
+    OUString sNamespace;
+    if (mbODFPre1_2)
+        sNamespace = NS_DOCUMENTSIGNATURES;
+    else
+        sNamespace = NS_DOCUMENTSIGNATURES_ODF_1_2;
+
+    pAttributeList->AddAttribute(
+        "xmlns",
+        sNamespace);
+
+    xSaxWriter->startDocument();
+    xSaxWriter->startElement(
+        "document-signatures",
+        uno::Reference< css::xml::sax::XAttributeList > (pAttributeList));
+
+    return xSaxWriter;
+}
+
+void XMLSignatureHelper::CloseDocumentHandler( const uno::Reference<xml::sax::XDocumentHandler>& xDocumentHandler )
+{
+    xDocumentHandler->endElement( "document-signatures" );
+    xDocumentHandler->endDocument();
+}
+
+void XMLSignatureHelper::ExportSignature(
+    const uno::Reference< xml::sax::XDocumentHandler >& xDocumentHandler,
+    const SignatureInformation& signatureInfo,
+    bool bXAdESCompliantIfODF )
+{
+    XSecController::exportSignature(xDocumentHandler, signatureInfo, bXAdESCompliantIfODF);
+}
+
+void XMLSignatureHelper::ExportOOXMLSignature(const uno::Reference<embed::XStorage>& xRootStorage, const uno::Reference<embed::XStorage>& xSignatureStorage, const SignatureInformation& rInformation, int nSignatureIndex)
+{
+    uno::Reference<io::XOutputStream> xOutputStream(xSignatureStorage->openStreamElement("sig" + OUString::number(nSignatureIndex) + ".xml", embed::ElementModes::READWRITE), uno::UNO_QUERY);
+
+    if (rInformation.aSignatureBytes.hasElements())
+        // This is a signature roundtrip, just write back the signature as-is.
+        xOutputStream->writeBytes(rInformation.aSignatureBytes);
+    else
+    {
+        uno::Reference<xml::sax::XWriter> xSaxWriter = xml::sax::Writer::create(mxCtx);
+        xSaxWriter->setOutputStream(xOutputStream);
+        xSaxWriter->startDocument();
+
+        mpXSecController->exportOOXMLSignature(xRootStorage, xSaxWriter, rInformation);
+
+        xSaxWriter->endDocument();
+    }
+}
+
+void XMLSignatureHelper::CreateAndWriteSignature( const uno::Reference< xml::sax::XDocumentHandler >& xDocumentHandler, bool bXAdESCompliantIfODF )
+{
+    mbError = false;
+
+    if ( !mpXSecController->WriteSignature( xDocumentHandler, bXAdESCompliantIfODF ) )
+    {
+        mbError = true;
+    }
+}
+
+bool XMLSignatureHelper::ReadAndVerifySignature( const css::uno::Reference< css::io::XInputStream >& xInputStream )
+{
+    mbError = false;
+
+    SAL_WARN_IF(!xInputStream.is(), "xmlsecurity.helper", "input stream missing");
+
+    // prepare ParserInputSrouce
+    xml::sax::InputSource aParserInput;
+    aParserInput.aInputStream = xInputStream;
+
+    // get SAX parser component
+    uno::Reference< xml::sax::XParser > xParser = xml::sax::Parser::create(mxCtx);
+
+    // create a signature reader
+    uno::Reference< xml::sax::XDocumentHandler > xHandler
+        = mpXSecController->createSignatureReader(*this);
+
+    // setup the connection:
+    // Parser -> SignatureReader
+    xParser->setDocumentHandler( xHandler );
+
+    // parser the stream
+    try
+    {
+        xParser->parseStream( aParserInput );
+    }
+    catch( uno::Exception& )
+    {
+        mbError = true;
+    }
+
+    // release the signature reader
+    mpXSecController->releaseSignatureReader( );
+
+    return !mbError;
+}
+
+SignatureInformation XMLSignatureHelper::GetSignatureInformation( sal_Int32 nSecurityId ) const
+{
+    return mpXSecController->getSignatureInformation( nSecurityId );
+}
+
+SignatureInformations XMLSignatureHelper::GetSignatureInformations() const
+{
+    return mpXSecController->getSignatureInformations();
+}
+
+void XMLSignatureHelper::StartVerifySignatureElement()
+{
+    if ( !maStartVerifySignatureHdl.IsSet() || maStartVerifySignatureHdl.Call(nullptr) )
+    {
+        sal_Int32 nSignatureId = mpXSecController->getNewSecurityId();
+        mpXSecController->addSignature( nSignatureId );
+    }
+}
+
+namespace
+{
+bool lcl_isSignatureType(const beans::StringPair& rPair)
+{
+    return rPair.First == "Type" && rPair.Second == OOXML_SIGNATURE_SIGNATURE;
+}
+bool lcl_isSignatureOriginType(const beans::StringPair& rPair)
+{
+    return rPair.First == "Type" && rPair.Second == OOXML_SIGNATURE_ORIGIN;
+}
+}
+
+bool XMLSignatureHelper::ReadAndVerifySignatureStorage(const uno::Reference<embed::XStorage>& xStorage, bool bCacheLastSignature)
+{
+    sal_Int32 nOpenMode = embed::ElementModes::READ;
+    if (xStorage.is() && !xStorage->hasByName("_rels"))
+    {
+        SAL_WARN("xmlsecurity.helper", "expected stream, in signature storage but not found: _rels");
+        return false;
+    }
+
+    uno::Reference<embed::XStorage> xSubStorage = xStorage->openStorageElement("_rels", nOpenMode);
+    uno::Reference<io::XInputStream> xRelStream(xSubStorage->openStreamElement("origin.sigs.rels", nOpenMode), uno::UNO_QUERY);
+    uno::Sequence< uno::Sequence<beans::StringPair> > aRelationsInfo = comphelper::OFOPXMLHelper::ReadRelationsInfoSequence(xRelStream, "origin.sigs.rels", mxCtx);
+
+    for (sal_Int32 i = 0; i < aRelationsInfo.getLength(); ++i)
+    {
+        const uno::Sequence<beans::StringPair>& rRelation = aRelationsInfo[i];
+        auto aRelation = comphelper::sequenceToContainer< std::vector<beans::StringPair> >(rRelation);
+        if (std::any_of(aRelation.begin(), aRelation.end(), lcl_isSignatureType))
+        {
+            std::vector<beans::StringPair>::iterator it = std::find_if(aRelation.begin(), aRelation.end(), [](const beans::StringPair& rPair) { return rPair.First == "Target"; });
+            if (it != aRelation.end())
+            {
+                if (xStorage.is() && !xStorage->hasByName(it->Second))
+                {
+                    SAL_WARN("xmlsecurity.helper", "expected stream, but not found: " << it->Second);
+                    continue;
+                }
+
+                uno::Reference<io::XInputStream> xInputStream(xStorage->openStreamElement(it->Second, nOpenMode), uno::UNO_QUERY);
+                if (!ReadAndVerifySignatureStorageStream(xInputStream))
+                    return false;
+
+                // By default, we cache. If it's requested, then we don't cache the last signature.
+                bool bCache = true;
+                if (!bCacheLastSignature && i == aRelationsInfo.getLength() - 1)
+                    bCache = false;
+
+                if (!bCache)
+                    continue;
+                // Store the contents of the stream as is, in case we need to write it back later.
+                xInputStream.clear();
+                xInputStream.set(xStorage->openStreamElement(it->Second, nOpenMode), uno::UNO_QUERY);
+                uno::Reference<beans::XPropertySet> xPropertySet(xInputStream, uno::UNO_QUERY);
+                if (!xPropertySet.is())
+                    continue;
+
+                sal_Int64 nSize = 0;
+                xPropertySet->getPropertyValue("Size") >>= nSize;
+                if (nSize < 0 || nSize > SAL_MAX_INT32)
+                {
+                    SAL_WARN("xmlsecurity.helper", "bogus signature size: " << nSize);
+                    continue;
+                }
+                uno::Sequence<sal_Int8> aData;
+                xInputStream->readBytes(aData, nSize);
+                mpXSecController->setSignatureBytes(aData);
+            }
+        }
+    }
+
+    return true;
+}
+
+bool XMLSignatureHelper::ReadAndVerifySignatureStorageStream(const css::uno::Reference<css::io::XInputStream>& xInputStream)
+{
+    mbError = false;
+
+    // Create the input source.
+    xml::sax::InputSource aParserInput;
+    aParserInput.aInputStream = xInputStream;
+
+    // Create the sax parser.
+    uno::Reference<xml::sax::XParser> xParser = xml::sax::Parser::create(mxCtx);
+
+    // Create the signature reader.
+    uno::Reference<xml::sax::XDocumentHandler> xHandler = mpXSecController->createSignatureReader(*this, embed::StorageFormats::OFOPXML);
+
+    // Parser -> signature reader.
+    xParser->setDocumentHandler(xHandler);
+
+    // Parse the stream.
+    try
+    {
+        xParser->parseStream(aParserInput);
+    }
+    catch(const uno::Exception&)
+    {
+        DBG_UNHANDLED_EXCEPTION("xmlsecurity.helper");
+    }
+
+    mpXSecController->releaseSignatureReader();
+
+    return !mbError;
+}
+
+void XMLSignatureHelper::EnsureSignaturesRelation(const css::uno::Reference<css::embed::XStorage>& xStorage, bool bAdd)
+{
+    sal_Int32 nOpenMode = embed::ElementModes::READWRITE;
+    uno::Reference<embed::XStorage> xSubStorage = xStorage->openStorageElement("_rels", nOpenMode);
+    uno::Reference<io::XInputStream> xRelStream(xSubStorage->openStreamElement(".rels", nOpenMode), uno::UNO_QUERY);
+    std::vector< uno::Sequence<beans::StringPair> > aRelationsInfo = comphelper::sequenceToContainer< std::vector< uno::Sequence<beans::StringPair> > >(comphelper::OFOPXMLHelper::ReadRelationsInfoSequence(xRelStream, ".rels", mxCtx));
+
+    // Do we have a relation already?
+    bool bHaveRelation = false;
+    int nCount = 0;
+    for (const uno::Sequence<beans::StringPair>& rRelation : aRelationsInfo)
+    {
+        auto aRelation = comphelper::sequenceToContainer< std::vector<beans::StringPair> >(rRelation);
+        if (std::any_of(aRelation.begin(), aRelation.end(), lcl_isSignatureOriginType))
+        {
+            bHaveRelation = true;
+            break;
+        }
+        ++nCount;
+    }
+
+    if (!bHaveRelation && bAdd)
+    {
+        // No, and have to add one.
+        std::vector<beans::StringPair> aRelation;
+        aRelation.emplace_back("Id", "rId" + OUString::number(++nCount));
+        aRelation.emplace_back("Type", OOXML_SIGNATURE_ORIGIN);
+        aRelation.emplace_back("Target", "_xmlsignatures/origin.sigs");
+        aRelationsInfo.push_back(comphelper::containerToSequence(aRelation));
+    }
+    else if (bHaveRelation && !bAdd)
+    {
+        // Yes, and need to remove it.
+        for (std::vector< uno::Sequence<beans::StringPair> >::iterator it = aRelationsInfo.begin(); it != aRelationsInfo.end();)
+        {
+            auto aRelation = comphelper::sequenceToContainer< std::vector<beans::StringPair> >(*it);
+            if (std::any_of(aRelation.begin(), aRelation.end(), lcl_isSignatureOriginType))
+                it = aRelationsInfo.erase(it);
+            else
+                ++it;
+        }
+    }
+
+    // Write it back.
+    uno::Reference<io::XTruncate> xTruncate(xRelStream, uno::UNO_QUERY);
+    xTruncate->truncate();
+    uno::Reference<io::XOutputStream> xOutputStream(xRelStream, uno::UNO_QUERY);
+    comphelper::OFOPXMLHelper::WriteRelationsInfoSequence(xOutputStream, comphelper::containerToSequence(aRelationsInfo), mxCtx);
+
+    // Commit it.
+    uno::Reference<embed::XTransactedObject> xTransact(xSubStorage, uno::UNO_QUERY);
+    xTransact->commit();
+    xTransact.set(xStorage, uno::UNO_QUERY);
+    xTransact->commit();
+}
+
+void XMLSignatureHelper::ExportSignatureRelations(const css::uno::Reference<css::embed::XStorage>& xStorage, int nSignatureCount)
+{
+    // Write the empty file, its relations will be the signatures.
+    sal_Int32 nOpenMode = embed::ElementModes::READWRITE;
+    uno::Reference<io::XOutputStream> xOriginStream(xStorage->openStreamElement("origin.sigs", nOpenMode), uno::UNO_QUERY);
+    uno::Reference<io::XTruncate> xTruncate(xOriginStream, uno::UNO_QUERY);
+    xTruncate->truncate();
+    xOriginStream->closeOutput();
+
+    // Write the relations.
+    uno::Reference<embed::XStorage> xSubStorage = xStorage->openStorageElement("_rels", nOpenMode);
+    uno::Reference<io::XOutputStream> xRelStream(xSubStorage->openStreamElement("origin.sigs.rels", nOpenMode), uno::UNO_QUERY);
+    std::vector< uno::Sequence<beans::StringPair> > aRelations;
+    for (int i = 0; i < nSignatureCount; ++i)
+    {
+        std::vector<beans::StringPair> aRelation;
+        aRelation.emplace_back("Id", "rId" + OUString::number(i + 1));
+        aRelation.emplace_back("Type", OOXML_SIGNATURE_SIGNATURE);
+        aRelation.emplace_back("Target", "sig" + OUString::number(i + 1) + ".xml");
+        aRelations.push_back(comphelper::containerToSequence(aRelation));
+    }
+    comphelper::OFOPXMLHelper::WriteRelationsInfoSequence(xRelStream, comphelper::containerToSequence(aRelations), mxCtx);
+    uno::Reference<embed::XTransactedObject> xTransact(xSubStorage, uno::UNO_QUERY);
+    xTransact->commit();
+}
+
+void XMLSignatureHelper::ExportSignatureContentTypes(const css::uno::Reference<css::embed::XStorage>& xStorage, int nSignatureCount)
+{
+    uno::Reference<io::XStream> xStream = xStorage->openStreamElement("[Content_Types].xml", embed::ElementModes::READWRITE);
+    uno::Reference<io::XInputStream> xInputStream = xStream->getInputStream();
+    uno::Sequence< uno::Sequence<beans::StringPair> > aContentTypeInfo = comphelper::OFOPXMLHelper::ReadContentTypeSequence(xInputStream, mxCtx);
+    if (aContentTypeInfo.getLength() < 2)
+    {
+        SAL_WARN("xmlsecurity.helper", "no defaults or overrides in aContentTypeInfo");
+        return;
+    }
+
+    // Append rels and sigs to defaults, if it's not there already.
+    uno::Sequence<beans::StringPair>& rDefaults = aContentTypeInfo[0];
+    auto aDefaults = comphelper::sequenceToContainer< std::vector<beans::StringPair> >(rDefaults);
+    if (std::none_of(rDefaults.begin(), rDefaults.end(), [](const beans::StringPair& rPair) { return rPair.First == "rels"; }))
+        aDefaults.emplace_back("rels", "application/vnd.openxmlformats-package.relationships+xml");
+
+    if (std::none_of(rDefaults.begin(), rDefaults.end(), [](const beans::StringPair& rPair) { return rPair.First == "sigs"; }))
+        aDefaults.emplace_back("sigs", "application/vnd.openxmlformats-package.digital-signature-origin");
+    rDefaults = comphelper::containerToSequence(aDefaults);
+
+    // Remove existing signature overrides.
+    uno::Sequence<beans::StringPair>& rOverrides = aContentTypeInfo[1];
+    auto aOverrides = comphelper::sequenceToContainer< std::vector<beans::StringPair> >(rOverrides);
+    aOverrides.erase(std::remove_if(aOverrides.begin(), aOverrides.end(), [](const beans::StringPair& rPair)
+    {
+        return rPair.First.startsWith("/_xmlsignatures/sig");
+    }), aOverrides.end());
+
+    // Add our signature overrides.
+    for (int i = 1; i <= nSignatureCount; ++i)
+        aOverrides.emplace_back("/_xmlsignatures/sig" + OUString::number(i) + ".xml", "application/vnd.openxmlformats-package.digital-signature-xmlsignature+xml");
+
+    rOverrides = comphelper::containerToSequence(aOverrides);
+    uno::Reference<io::XOutputStream> xOutputStream = xStream->getOutputStream();
+    uno::Reference <io::XTruncate> xTruncate(xOutputStream, uno::UNO_QUERY);
+    xTruncate->truncate();
+    comphelper::OFOPXMLHelper::WriteContentSequence(xOutputStream, rDefaults, rOverrides, mxCtx);
+    uno::Reference<embed::XTransactedObject> xTransact(xStorage, uno::UNO_QUERY);
+    xTransact->commit();
+}
+void XMLSignatureHelper::CreateAndWriteOOXMLSignature(const uno::Reference<embed::XStorage>& xRootStorage, const uno::Reference<embed::XStorage>& xSignatureStorage, int nSignatureIndex)
+{
+    uno::Reference<io::XOutputStream> xOutputStream(xSignatureStorage->openStreamElement("sig" + OUString::number(nSignatureIndex) + ".xml", embed::ElementModes::READWRITE), uno::UNO_QUERY);
+    uno::Reference<xml::sax::XWriter> xSaxWriter = xml::sax::Writer::create(mxCtx);
+    xSaxWriter->setOutputStream(xOutputStream);
+    xSaxWriter->startDocument();
+
+    mbError = false;
+    if (!mpXSecController->WriteOOXMLSignature(xRootStorage, xSaxWriter))
+        mbError = true;
+
+    xSaxWriter->endDocument();
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/helper/xmlsignaturehelper2.cxx b/xmlsecurity/source/helper/xmlsignaturehelper2.cxx
new file mode 100644
index 000000000..1a7a33459
--- /dev/null
+++ b/xmlsecurity/source/helper/xmlsignaturehelper2.cxx
@@ -0,0 +1,113 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <xmlsignaturehelper2.hxx>
+
+#include <tools/solar.h>
+#include <unotools/streamhelper.hxx>
+
+#include <com/sun/star/embed/XStorage.hpp>
+#include <com/sun/star/embed/ElementModes.hpp>
+#include <osl/diagnose.h>
+#include <rtl/uri.hxx>
+#include <sal/log.hxx>
+
+using namespace com::sun::star;
+
+// XUriBinding
+
+UriBindingHelper::UriBindingHelper()
+{
+}
+
+UriBindingHelper::UriBindingHelper( const css::uno::Reference < css::embed::XStorage >& rxStorage )
+{
+    mxStorage = rxStorage;
+}
+
+void SAL_CALL UriBindingHelper::setUriBinding( const OUString& /*uri*/, const uno::Reference< io::XInputStream >&)
+{
+}
+
+uno::Reference< io::XInputStream > SAL_CALL UriBindingHelper::getUriBinding( const OUString& uri )
+{
+    uno::Reference< io::XInputStream > xInputStream;
+    if ( mxStorage.is() )
+    {
+        xInputStream = OpenInputStream( mxStorage, uri );
+    }
+    else
+    {
+        SvFileStream* pStream = new SvFileStream( uri, StreamMode::READ );
+        sal_uInt64 nBytes = pStream->TellEnd();
+        SvLockBytesRef xLockBytes = new SvLockBytes( pStream, true );
+        xInputStream = new utl::OInputStreamHelper( xLockBytes, nBytes );
+    }
+    return xInputStream;
+}
+
+uno::Reference < io::XInputStream > UriBindingHelper::OpenInputStream( const uno::Reference < embed::XStorage >& rxStore, const OUString& rURI )
+{
+    OSL_ASSERT(!rURI.isEmpty());
+    uno::Reference < io::XInputStream > xInStream;
+
+    OUString aURI(rURI);
+    // Ignore leading slash, don't attempt to open a storage with name "".
+    if (aURI.startsWith("/"))
+        aURI = aURI.copy(1);
+    // Ignore query part of the URI.
+    sal_Int32 nQueryPos = aURI.indexOf('?');
+    if (nQueryPos != -1)
+        aURI = aURI.copy(0, nQueryPos);
+
+
+    sal_Int32 nSepPos = aURI.indexOf( '/' );
+    if ( nSepPos == -1 )
+    {
+        // Cloning because of I can't keep all storage references open
+        // MBA with think about a better API...
+        const OUString sName = ::rtl::Uri::decode(
+            aURI, rtl_UriDecodeStrict, rtl_UriCharClassRelSegment);
+        if (sName.isEmpty() && !aURI.isEmpty())
+            throw uno::Exception("Could not decode URI for stream element.", nullptr);
+
+        uno::Reference< io::XStream > xStream;
+        if (!rxStore->hasByName(sName))
+            SAL_WARN("xmlsecurity.helper", "expected stream, but not found: " << sName);
+        else
+            xStream = rxStore->cloneStreamElement( sName );
+        if ( !xStream.is() )
+            throw uno::RuntimeException();
+        xInStream = xStream->getInputStream();
+    }
+    else
+    {
+        const OUString aStoreName = ::rtl::Uri::decode(
+            aURI.copy( 0, nSepPos ), rtl_UriDecodeStrict, rtl_UriCharClassRelSegment);
+        if (aStoreName.isEmpty() && !aURI.isEmpty())
+            throw uno::Exception("Could not decode URI for stream element.", nullptr);
+
+        OUString aElement = aURI.copy( nSepPos+1 );
+        uno::Reference < embed::XStorage > xSubStore = rxStore->openStorageElement( aStoreName, embed::ElementModes::READ );
+        xInStream = OpenInputStream( xSubStore, aElement );
+    }
+    return xInStream;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/helper/xsecctl.cxx b/xmlsecurity/source/helper/xsecctl.cxx
new file mode 100644
index 000000000..cac30006b
--- /dev/null
+++ b/xmlsecurity/source/helper/xsecctl.cxx
@@ -0,0 +1,986 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <config_gpgme.h>
+
+#include <xsecctl.hxx>
+#include <documentsignaturehelper.hxx>
+#include <framework/saxeventkeeperimpl.hxx>
+#include <xmlsec/xmldocumentwrapper_xmlsecimpl.hxx>
+#if HAVE_FEATURE_GPGME
+# include <gpg/xmlsignature_gpgimpl.hxx>
+#endif
+
+#include <com/sun/star/xml/crypto/sax/XMissionTaker.hpp>
+#include <com/sun/star/xml/crypto/SecurityOperationStatus.hpp>
+#include <com/sun/star/uno/XComponentContext.hpp>
+#include <com/sun/star/xml/sax/XParser.hpp>
+#include <com/sun/star/xml/crypto/XXMLSignature.hpp>
+
+#include <xmloff/attrlist.hxx>
+#include <rtl/ustrbuf.hxx>
+#include <rtl/ref.hxx>
+#include <sal/log.hxx>
+#include <unotools/datetime.hxx>
+#include "ooxmlsecexporter.hxx"
+#include <xmlsignaturehelper2.hxx>
+
+using namespace com::sun::star;
+
+namespace
+{
+OUString getDigestURI(sal_Int32 nID)
+{
+    switch( nID )
+    {
+        case css::xml::crypto::DigestID::SHA1:
+            return ALGO_XMLDSIGSHA1;
+        case css::xml::crypto::DigestID::SHA256:
+            return ALGO_XMLDSIGSHA256;
+        case css::xml::crypto::DigestID::SHA512:
+            return ALGO_XMLDSIGSHA512;
+        default:
+            return ALGO_XMLDSIGSHA1;
+    }
+}
+OUString getSignatureURI(svl::crypto::SignatureMethodAlgorithm eAlgorithm, sal_Int32 nDigestID)
+{
+    OUString aRet;
+
+    if (eAlgorithm == svl::crypto::SignatureMethodAlgorithm::ECDSA)
+    {
+        switch (nDigestID)
+        {
+            case css::xml::crypto::DigestID::SHA1:
+                aRet = ALGO_ECDSASHA1;
+                break;
+            case css::xml::crypto::DigestID::SHA256:
+                aRet = ALGO_ECDSASHA256;
+                break;
+            case css::xml::crypto::DigestID::SHA512:
+                aRet = ALGO_ECDSASHA512;
+                break;
+            default:
+                aRet = ALGO_ECDSASHA1;
+                break;
+        }
+    }
+    if (!aRet.isEmpty())
+        return aRet;
+
+    switch (nDigestID)
+    {
+        case css::xml::crypto::DigestID::SHA1:
+            return ALGO_RSASHA1;
+        case css::xml::crypto::DigestID::SHA256:
+            return ALGO_RSASHA256;
+        case css::xml::crypto::DigestID::SHA512:
+            return ALGO_RSASHA512;
+        default:
+            return ALGO_RSASHA1;
+    }
+}
+}
+
+XSecController::XSecController( const css::uno::Reference<css::uno::XComponentContext>& rxCtx )
+    : mxCtx(rxCtx)
+    , m_nNextSecurityId(1)
+    , m_bIsPreviousNodeInitializable(false)
+    , m_bIsSAXEventKeeperConnected(false)
+    , m_bIsCollectingElement(false)
+    , m_bIsBlocking(false)
+    , m_eStatusOfSecurityComponents(InitializationState::UNINITIALIZED)
+    , m_bIsSAXEventKeeperSticky(false)
+    , m_nReservedSignatureId(0)
+    , m_bVerifyCurrentSignature(false)
+{
+}
+
+XSecController::~XSecController()
+{
+}
+
+
+/*
+ * private methods
+ */
+int XSecController::findSignatureInfor( sal_Int32 nSecurityId) const
+/****** XSecController/findSignatureInfor *************************************
+ *
+ *   NAME
+ *  findSignatureInfor -- find SignatureInformation struct for a particular
+ *                        signature
+ *
+ *   SYNOPSIS
+ *  index = findSignatureInfor( nSecurityId );
+ *
+ *   INPUTS
+ *  nSecurityId - the signature's id
+ *
+ *   RESULT
+ *  index - the index of the signature, or -1 when no such signature
+ *          existing
+ ******************************************************************************/
+{
+    int i;
+    int size = m_vInternalSignatureInformations.size();
+
+    for (i=0; i<size; ++i)
+    {
+        if (m_vInternalSignatureInformations[i].signatureInfor.nSecurityId == nSecurityId)
+        {
+            return i;
+        }
+    }
+
+    return -1;
+}
+
+void XSecController::createXSecComponent( )
+/****** XSecController/createXSecComponent ************************************
+ *
+ *   NAME
+ *  bResult = createXSecComponent -- creates xml security components
+ *
+ *   FUNCTION
+ *  Creates xml security components, including:
+ *  1. an xml signature bridge component
+ *  2. an XMLDocumentWrapper component
+ *  3. a SAXEventKeeper component
+ ******************************************************************************/
+{
+    /*
+     * marks all security components are not available.
+     */
+    m_eStatusOfSecurityComponents = InitializationState::FAILTOINITIALIZED;
+    m_xXMLSignature = nullptr;
+    m_xXMLDocumentWrapper = nullptr;
+    m_xSAXEventKeeper = nullptr;
+
+    css::uno::Reference< css::lang::XMultiComponentFactory > xMCF( mxCtx->getServiceManager() );
+
+#if HAVE_FEATURE_GPGME
+    uno::Reference< lang::XServiceInfo > xServiceInfo( m_xSecurityContext, css::uno::UNO_QUERY );
+    if (xServiceInfo->getImplementationName() == "com.sun.star.xml.security.gpg.XMLSecurityContext_GpgImpl")
+        m_xXMLSignature.set(new XMLSignature_GpgImpl());
+    else // xmlsec or mscrypt
+#endif
+        m_xXMLSignature.set(xMCF->createInstanceWithContext("com.sun.star.xml.crypto.XMLSignature", mxCtx), css::uno::UNO_QUERY);
+
+    bool bSuccess = m_xXMLSignature.is();
+    if ( bSuccess )
+    /*
+     * XMLSignature created successfully.
+     */
+        m_xXMLDocumentWrapper = new XMLDocumentWrapper_XmlSecImpl();
+
+    bSuccess &= m_xXMLDocumentWrapper.is();
+    if ( bSuccess )
+        m_xSAXEventKeeper = new SAXEventKeeperImpl();
+
+    bSuccess &= m_xSAXEventKeeper.is();
+
+    if (bSuccess)
+    /*
+     * SAXEventKeeper created successfully.
+     */
+    {
+        css::uno::Sequence <css::uno::Any> arg(1);
+        arg[0] <<= uno::Reference<xml::wrapper::XXMLDocumentWrapper>(m_xXMLDocumentWrapper.get());
+        m_xSAXEventKeeper->initialize(arg);
+
+        css::uno::Reference< css::xml::crypto::sax::XSAXEventKeeperStatusChangeListener >
+            xStatusChangeListener = this;
+
+        m_xSAXEventKeeper->addSAXEventKeeperStatusChangeListener( xStatusChangeListener );
+
+        m_eStatusOfSecurityComponents = InitializationState::INITIALIZED;
+    }
+}
+
+bool XSecController::chainOn()
+/****** XSecController/chainOn ************************************************
+ *
+ *   NAME
+ *  chainOn -- tries to connect the SAXEventKeeper with the SAX chain.
+ *
+ *   SYNOPSIS
+ *  bJustChainingOn = chainOn();
+ *
+ *   FUNCTION
+ *  First, checks whether the SAXEventKeeper is on the SAX chain. If not,
+ *  creates xml security components, and chains the SAXEventKeeper into
+ *  the SAX chain.
+ *  Before being chained in, the SAXEventKeeper needs to receive all
+ *  missed key SAX events, which can promise the DOM tree buffered by the
+ *  SAXEventKeeper has the same structure with the original document.
+ *
+ *   RESULT
+ *  bJustChainingOn - whether the SAXEventKeeper is just chained into the
+ *                    SAX chain.
+ *
+ *   NOTES
+ *  Sometimes, the last key SAX event can't be transferred to the
+ *  SAXEventKeeper together.
+ *  For instance, at the time a referenced element is detected, the
+ *  startElement event has already been reserved by the ElementStackKeeper.
+ *  Meanwhile, an ElementCollector needs to be created before the
+ *  SAXEventKeeper receives that startElement event.
+ *  So for the SAXEventKeeper, it needs to receive all missed key SAX
+ *  events except that startElement event, then adds a new
+ *  ElementCollector, then receives that startElement event.
+ ******************************************************************************/
+{
+    bool rc = false;
+
+    if (!m_bIsSAXEventKeeperSticky && !m_bIsSAXEventKeeperConnected)
+    {
+        if ( m_eStatusOfSecurityComponents == InitializationState::UNINITIALIZED )
+        {
+            createXSecComponent();
+        }
+
+        if ( m_eStatusOfSecurityComponents == InitializationState::INITIALIZED )
+        /*
+         * if all security components are ready, chains on the SAXEventKeeper
+         */
+        {
+            /*
+             * disconnect the SAXEventKeeper with its current output handler,
+             * to make sure no SAX event is forwarded during the connecting
+             * phase.
+             */
+            m_xSAXEventKeeper->setNextHandler( nullptr );
+
+            css::uno::Reference< css::xml::sax::XDocumentHandler > xSEKHandler(static_cast<cppu::OWeakObject*>(m_xSAXEventKeeper.get()), css::uno::UNO_QUERY);
+
+            /*
+             * connects the previous document handler on the SAX chain
+             */
+            if ( m_xPreviousNodeOnSAXChain.is() )
+            {
+                if ( m_bIsPreviousNodeInitializable )
+                {
+                    css::uno::Reference< css::lang::XInitialization > xInitialization
+                        (m_xPreviousNodeOnSAXChain, css::uno::UNO_QUERY);
+
+                    css::uno::Sequence<css::uno::Any> aArgs( 1 );
+                    aArgs[0] <<= xSEKHandler;
+                    xInitialization->initialize(aArgs);
+                }
+                else
+                {
+                    css::uno::Reference< css::xml::sax::XParser > xParser
+                        (m_xPreviousNodeOnSAXChain, css::uno::UNO_QUERY);
+                    xParser->setDocumentHandler( xSEKHandler );
+                }
+            }
+
+            /*
+             * connects the next document handler on the SAX chain
+             */
+            m_xSAXEventKeeper->setNextHandler(uno::Reference<xml::sax::XDocumentHandler>());
+
+            m_bIsSAXEventKeeperConnected = true;
+
+            rc = true;
+        }
+    }
+
+    return rc;
+}
+
+void XSecController::chainOff()
+/****** XSecController/chainOff ***********************************************
+ *
+ *   NAME
+ *  chainOff -- disconnects the SAXEventKeeper from the SAX chain.
+ ******************************************************************************/
+{
+    if (!m_bIsSAXEventKeeperSticky )
+    {
+        if (m_bIsSAXEventKeeperConnected)
+        {
+            m_xSAXEventKeeper->setNextHandler( nullptr );
+
+            if ( m_xPreviousNodeOnSAXChain.is() )
+            {
+                if ( m_bIsPreviousNodeInitializable )
+                {
+                    css::uno::Reference< css::lang::XInitialization > xInitialization
+                        (m_xPreviousNodeOnSAXChain, css::uno::UNO_QUERY);
+
+                    css::uno::Sequence<css::uno::Any> aArgs( 1 );
+                    aArgs[0] <<= uno::Reference<xml::sax::XDocumentHandler>();
+                    xInitialization->initialize(aArgs);
+                }
+                else
+                {
+                    css::uno::Reference< css::xml::sax::XParser > xParser(m_xPreviousNodeOnSAXChain, css::uno::UNO_QUERY);
+                    xParser->setDocumentHandler(uno::Reference<xml::sax::XDocumentHandler>());
+                }
+            }
+
+            m_bIsSAXEventKeeperConnected = false;
+        }
+    }
+}
+
+void XSecController::checkChainingStatus()
+/****** XSecController/checkChainingStatus ************************************
+ *
+ *   NAME
+ *  checkChainingStatus -- connects or disconnects the SAXEventKeeper
+ *  according to the current situation.
+ *
+ *   SYNOPSIS
+ *  checkChainingStatus( );
+ *
+ *   FUNCTION
+ *  The SAXEventKeeper is chained into the SAX chain, when:
+ *  1. some element is being collected, or
+ *  2. the SAX event stream is blocking.
+ *  Otherwise, chain off the SAXEventKeeper.
+ ******************************************************************************/
+{
+    if ( m_bIsCollectingElement || m_bIsBlocking )
+    {
+        chainOn();
+    }
+    else
+    {
+        chainOff();
+    }
+}
+
+void XSecController::initializeSAXChain()
+/****** XSecController/initializeSAXChain *************************************
+ *
+ *   NAME
+ *  initializeSAXChain -- initializes the SAX chain according to the
+ *  current setting.
+ *
+ *   FUNCTION
+ *  Initializes the SAX chain, if the SAXEventKeeper is asked to be always
+ *  on the SAX chain, chains it on. Otherwise, starts the
+ *  ElementStackKeeper to reserve key SAX events.
+ ******************************************************************************/
+{
+    m_bIsSAXEventKeeperConnected = false;
+    m_bIsCollectingElement = false;
+    m_bIsBlocking = false;
+
+    chainOff();
+}
+
+css::uno::Reference< css::io::XInputStream >
+    XSecController::getObjectInputStream( const OUString& objectURL )
+/****** XSecController/getObjectInputStream ************************************
+ *
+ *   NAME
+ *  getObjectInputStream -- get a XInputStream interface from a SotStorage
+ *
+ *   SYNOPSIS
+ *  xInputStream = getObjectInputStream( objectURL );
+ *
+ *   INPUTS
+ *  objectURL - the object uri
+ *
+ *   RESULT
+ *  xInputStream - the XInputStream interface
+ ******************************************************************************/
+{
+    css::uno::Reference< css::io::XInputStream > xObjectInputStream;
+
+    SAL_WARN_IF( !m_xUriBinding.is(), "xmlsecurity.helper", "Need XUriBinding!" );
+
+    xObjectInputStream = m_xUriBinding->getUriBinding(objectURL);
+
+    return xObjectInputStream;
+}
+
+/*
+ * public methods
+ */
+
+sal_Int32 XSecController::getNewSecurityId(  )
+{
+    sal_Int32 nId = m_nNextSecurityId;
+    m_nNextSecurityId++;
+    return nId;
+}
+
+void XSecController::startMission(const rtl::Reference<UriBindingHelper>& xUriBinding, const css::uno::Reference< css::xml::crypto::XXMLSecurityContext >& xSecurityContext )
+/****** XSecController/startMission *******************************************
+ *
+ *   NAME
+ *  startMission -- starts a new security mission.
+ *
+ *   FUNCTION
+ *  get ready for a new mission.
+ *
+ *   INPUTS
+ *  xUriBinding       - the Uri binding that provide maps between uris and
+ *                          XInputStreams
+ *  xSecurityContext  - the security context component which can provide
+ *                      cryptoken
+ ******************************************************************************/
+{
+    m_xUriBinding = xUriBinding;
+
+    m_eStatusOfSecurityComponents = InitializationState::UNINITIALIZED;
+    m_xSecurityContext = xSecurityContext;
+
+    m_vInternalSignatureInformations.clear();
+
+    m_bVerifyCurrentSignature = false;
+}
+
+void XSecController::setSAXChainConnector(const css::uno::Reference< css::lang::XInitialization >& xInitialization)
+/****** XSecController/setSAXChainConnector ***********************************
+ *
+ *   NAME
+ *  setSAXChainConnector -- configures the components which will
+ *  collaborate with the SAXEventKeeper on the SAX chain.
+ *
+ *   SYNOPSIS
+ *  setSAXChainConnector(xInitialization);
+ *
+ *   INPUTS
+ *  xInitialization     - the previous node on the SAX chain
+ ******************************************************************************/
+{
+    m_bIsPreviousNodeInitializable = true;
+    m_xPreviousNodeOnSAXChain = xInitialization;
+
+    initializeSAXChain( );
+}
+
+void XSecController::clearSAXChainConnector()
+/****** XSecController/clearSAXChainConnector *********************************
+ *
+ *   NAME
+ *  clearSAXChainConnector -- resets the collaborating components.
+ ******************************************************************************/
+{
+    chainOff();
+
+    m_xPreviousNodeOnSAXChain = nullptr;
+}
+
+void XSecController::endMission()
+/****** XSecController/endMission *********************************************
+ *
+ *   NAME
+ *  endMission -- forces to end all missions
+ *
+ *   FUNCTION
+ *  Deletes all signature information and forces all missions to an end.
+ ******************************************************************************/
+{
+    sal_Int32 size = m_vInternalSignatureInformations.size();
+
+    for (int i=0; i<size; ++i)
+    {
+        if ( m_eStatusOfSecurityComponents == InitializationState::INITIALIZED )
+        /*
+         * ResolvedListener only exist when the security components are created.
+         */
+        {
+            css::uno::Reference< css::xml::crypto::sax::XMissionTaker > xMissionTaker
+                ( m_vInternalSignatureInformations[i].xReferenceResolvedListener, css::uno::UNO_QUERY );
+
+            /*
+             * asks the SignatureCreator/SignatureVerifier to release
+             * all resources it uses.
+             */
+            xMissionTaker->endMission();
+        }
+    }
+
+    m_xUriBinding = nullptr;
+    m_xSecurityContext = nullptr;
+
+    /*
+     * free the status change listener reference to this object
+     */
+    if (m_xSAXEventKeeper.is())
+        m_xSAXEventKeeper->addSAXEventKeeperStatusChangeListener( nullptr );
+}
+
+namespace
+{
+void writeUnsignedProperties(
+    const css::uno::Reference<css::xml::sax::XDocumentHandler>& xDocumentHandler,
+    const SignatureInformation& signatureInfo)
+{
+    {
+        rtl::Reference<SvXMLAttributeList> pAttributeList(new SvXMLAttributeList());
+        pAttributeList->AddAttribute("Id", "idUnsignedProperties");
+        xDocumentHandler->startElement("xd:UnsignedProperties", uno::Reference<xml::sax::XAttributeList>(pAttributeList.get()));
+    }
+
+    {
+        xDocumentHandler->startElement("xd:UnsignedSignatureProperties", uno::Reference<xml::sax::XAttributeList>(new SvXMLAttributeList()));
+
+        {
+            xDocumentHandler->startElement("xd:CertificateValues", uno::Reference<xml::sax::XAttributeList>(new SvXMLAttributeList()));
+
+            {
+                for (const auto& i: signatureInfo.maEncapsulatedX509Certificates)
+                {
+                    xDocumentHandler->startElement("xd:EncapsulatedX509Certificate", uno::Reference<xml::sax::XAttributeList>(new SvXMLAttributeList()));
+                    xDocumentHandler->characters(i);
+                    xDocumentHandler->endElement("xd:EncapsulatedX509Certificate");
+                }
+            }
+
+            xDocumentHandler->endElement("xd:CertificateValues");
+        }
+
+        xDocumentHandler->endElement("xd:UnsignedSignatureProperties");
+    }
+
+    xDocumentHandler->endElement("xd:UnsignedProperties");
+}
+
+}
+
+void XSecController::exportSignature(
+    const css::uno::Reference<css::xml::sax::XDocumentHandler>& xDocumentHandler,
+    const SignatureInformation& signatureInfo,
+    bool bXAdESCompliantIfODF )
+/****** XSecController/exportSignature ****************************************
+ *
+ *   NAME
+ *  exportSignature -- export a signature structure to an XDocumentHandler
+ *
+ *   SYNOPSIS
+ *  exportSignature( xDocumentHandler, signatureInfo);
+ *
+ *   INPUTS
+ *  xDocumentHandler    - the document handler to receive the signature
+ *  signatureInfo       - signature to be exported
+ ******************************************************************************/
+{
+    const SignatureReferenceInformations& vReferenceInfors = signatureInfo.vSignatureReferenceInfors;
+    SvXMLAttributeList *pAttributeList;
+
+    /*
+     * Write Signature element
+     */
+    pAttributeList = new SvXMLAttributeList();
+    pAttributeList->AddAttribute(
+        "xmlns",
+        NS_XMLDSIG);
+
+    if (!signatureInfo.ouSignatureId.isEmpty())
+    {
+        pAttributeList->AddAttribute(
+            "Id",
+            signatureInfo.ouSignatureId);
+    }
+
+    xDocumentHandler->startElement( "Signature", css::uno::Reference< css::xml::sax::XAttributeList > (pAttributeList));
+    {
+        /* Write SignedInfo element */
+        xDocumentHandler->startElement(
+            "SignedInfo",
+            css::uno::Reference< css::xml::sax::XAttributeList > (new SvXMLAttributeList()));
+        {
+            /* Write CanonicalizationMethod element */
+            pAttributeList = new SvXMLAttributeList();
+            pAttributeList->AddAttribute(
+                "Algorithm",
+                ALGO_C14N);
+            xDocumentHandler->startElement( "CanonicalizationMethod", css::uno::Reference< css::xml::sax::XAttributeList > (pAttributeList) );
+            xDocumentHandler->endElement( "CanonicalizationMethod" );
+
+            /* Write SignatureMethod element */
+            pAttributeList = new SvXMLAttributeList();
+
+            // TODO: actually roundtrip this value from parsing documentsignatures.xml - entirely
+            // broken to assume this would in any way relate to the 1st reference's digest algo
+
+            // Assume that all Reference elements use the same DigestMethod:Algorithm, and that the
+            // SignatureMethod:Algorithm should be the corresponding one.
+            pAttributeList->AddAttribute(
+                "Algorithm",
+                getSignatureURI(signatureInfo.eAlgorithmID, vReferenceInfors[0].nDigestID));
+            xDocumentHandler->startElement( "SignatureMethod", css::uno::Reference< css::xml::sax::XAttributeList > (pAttributeList) );
+            xDocumentHandler->endElement( "SignatureMethod" );
+
+            /* Write Reference element */
+            int j;
+            int refNum = vReferenceInfors.size();
+
+            for(j=0; j<refNum; ++j)
+            {
+                const SignatureReferenceInformation& refInfor = vReferenceInfors[j];
+
+                pAttributeList = new SvXMLAttributeList();
+                if ( refInfor.nType != SignatureReferenceType::SAMEDOCUMENT )
+                /*
+                 * stream reference
+                 */
+                {
+                    pAttributeList->AddAttribute(
+                        "URI",
+                        refInfor.ouURI);
+                }
+                else
+                /*
+                 * same-document reference
+                 */
+                {
+                    pAttributeList->AddAttribute(
+                        "URI",
+                        "#" + refInfor.ouURI);
+
+                    if (bXAdESCompliantIfODF && refInfor.ouURI == "idSignedProperties" && !refInfor.ouType.isEmpty())
+                    {
+                        // The reference which points to the SignedProperties
+                        // shall have this specific type.
+                        pAttributeList->AddAttribute("Type",
+                                                     refInfor.ouType);
+                    }
+                }
+
+                xDocumentHandler->startElement( "Reference", css::uno::Reference< css::xml::sax::XAttributeList > (pAttributeList) );
+                {
+                    /* Write Transforms element */
+                    if (refInfor.nType == SignatureReferenceType::XMLSTREAM)
+                    /*
+                     * xml stream, so c14n transform is needed
+                     */
+                    {
+                        xDocumentHandler->startElement(
+                            "Transforms",
+                            css::uno::Reference< css::xml::sax::XAttributeList > (new SvXMLAttributeList()));
+                        {
+                            pAttributeList = new SvXMLAttributeList();
+                            pAttributeList->AddAttribute(
+                                "Algorithm",
+                                ALGO_C14N);
+                            xDocumentHandler->startElement(
+                                "Transform",
+                                css::uno::Reference< css::xml::sax::XAttributeList > (pAttributeList) );
+                            xDocumentHandler->endElement( "Transform" );
+                        }
+                        xDocumentHandler->endElement( "Transforms" );
+                    }
+
+                    /* Write DigestMethod element */
+                    pAttributeList = new SvXMLAttributeList();
+                    pAttributeList->AddAttribute(
+                        "Algorithm",
+                        getDigestURI(refInfor.nDigestID));
+                    xDocumentHandler->startElement(
+                        "DigestMethod",
+                        css::uno::Reference< css::xml::sax::XAttributeList > (pAttributeList) );
+                    xDocumentHandler->endElement( "DigestMethod" );
+
+                    /* Write DigestValue element */
+                    xDocumentHandler->startElement(
+                        "DigestValue",
+                        css::uno::Reference< css::xml::sax::XAttributeList > (new SvXMLAttributeList()));
+                    xDocumentHandler->characters( refInfor.ouDigestValue );
+                    xDocumentHandler->endElement( "DigestValue" );
+                }
+                xDocumentHandler->endElement( "Reference" );
+            }
+        }
+        xDocumentHandler->endElement( "SignedInfo" );
+
+        /* Write SignatureValue element */
+        xDocumentHandler->startElement(
+            "SignatureValue",
+            css::uno::Reference< css::xml::sax::XAttributeList > (new SvXMLAttributeList()));
+        xDocumentHandler->characters( signatureInfo.ouSignatureValue );
+        xDocumentHandler->endElement( "SignatureValue" );
+
+        /* Write KeyInfo element */
+        xDocumentHandler->startElement(
+            "KeyInfo",
+            css::uno::Reference< css::xml::sax::XAttributeList > (new SvXMLAttributeList()));
+        {
+            // GPG or X509 key?
+            if (!signatureInfo.ouGpgCertificate.isEmpty())
+            {
+                pAttributeList = new SvXMLAttributeList();
+                pAttributeList->AddAttribute("xmlns:loext", NS_LOEXT);
+                /* Write PGPData element */
+                xDocumentHandler->startElement(
+                    "PGPData",
+                    css::uno::Reference< css::xml::sax::XAttributeList > (pAttributeList));
+                {
+                    /* Write keyid element */
+                    xDocumentHandler->startElement(
+                        "PGPKeyID",
+                        css::uno::Reference< css::xml::sax::XAttributeList > (new SvXMLAttributeList()));
+                    xDocumentHandler->characters( signatureInfo.ouCertDigest );
+                    xDocumentHandler->endElement( "PGPKeyID" );
+
+                    /* Write PGPKeyPacket element */
+                    if (!signatureInfo.ouGpgCertificate.isEmpty())
+                    {
+                        xDocumentHandler->startElement(
+                            "PGPKeyPacket",
+                            css::uno::Reference< css::xml::sax::XAttributeList > (new SvXMLAttributeList()));
+                        xDocumentHandler->characters( signatureInfo.ouGpgCertificate );
+                        xDocumentHandler->endElement( "PGPKeyPacket" );
+                    }
+
+                    /* Write PGPOwner element */
+                    xDocumentHandler->startElement(
+                        "loext:PGPOwner",
+                        css::uno::Reference< css::xml::sax::XAttributeList >(new SvXMLAttributeList()));
+                    xDocumentHandler->characters( signatureInfo.ouGpgOwner );
+                    xDocumentHandler->endElement( "loext:PGPOwner" );
+                }
+                xDocumentHandler->endElement( "PGPData" );
+            }
+            else
+            {
+                /* Write X509Data element */
+                xDocumentHandler->startElement(
+                    "X509Data",
+                    css::uno::Reference< css::xml::sax::XAttributeList > (new SvXMLAttributeList()));
+                {
+                    /* Write X509IssuerSerial element */
+                    xDocumentHandler->startElement(
+                        "X509IssuerSerial",
+                        css::uno::Reference< css::xml::sax::XAttributeList > (new SvXMLAttributeList()));
+                    {
+                        /* Write X509IssuerName element */
+                        xDocumentHandler->startElement(
+                            "X509IssuerName",
+                            css::uno::Reference< css::xml::sax::XAttributeList > (new SvXMLAttributeList()));
+                        xDocumentHandler->characters( signatureInfo.ouX509IssuerName );
+                        xDocumentHandler->endElement( "X509IssuerName" );
+
+                        /* Write X509SerialNumber element */
+                        xDocumentHandler->startElement(
+                            "X509SerialNumber",
+                            css::uno::Reference< css::xml::sax::XAttributeList > (new SvXMLAttributeList()));
+                        xDocumentHandler->characters( signatureInfo.ouX509SerialNumber );
+                        xDocumentHandler->endElement( "X509SerialNumber" );
+                    }
+                    xDocumentHandler->endElement( "X509IssuerSerial" );
+
+                    /* Write X509Certificate element */
+                    if (!signatureInfo.ouX509Certificate.isEmpty())
+                    {
+                        xDocumentHandler->startElement(
+                            "X509Certificate",
+                            css::uno::Reference< css::xml::sax::XAttributeList > (new SvXMLAttributeList()));
+                        xDocumentHandler->characters( signatureInfo.ouX509Certificate );
+                        xDocumentHandler->endElement( "X509Certificate" );
+                    }
+                }
+                xDocumentHandler->endElement( "X509Data" );
+            }
+        }
+        xDocumentHandler->endElement( "KeyInfo" );
+
+        OUString sDate;
+
+        /* Write Object element */
+        xDocumentHandler->startElement(
+            "Object",
+            css::uno::Reference< css::xml::sax::XAttributeList > (new SvXMLAttributeList()));
+        {
+            /* Write SignatureProperties element */
+            xDocumentHandler->startElement(
+                "SignatureProperties",
+                css::uno::Reference< css::xml::sax::XAttributeList > (new SvXMLAttributeList()));
+            {
+                /* Write SignatureProperty element */
+                pAttributeList = new SvXMLAttributeList();
+                pAttributeList->AddAttribute(
+                    "Id",
+                    signatureInfo.ouPropertyId);
+                pAttributeList->AddAttribute(
+                    "Target",
+                    "#" + signatureInfo.ouSignatureId);
+                xDocumentHandler->startElement(
+                    "SignatureProperty",
+                    css::uno::Reference< css::xml::sax::XAttributeList > (pAttributeList));
+                {
+                    /* Write timestamp element */
+
+                    pAttributeList = new SvXMLAttributeList();
+                    pAttributeList->AddAttribute(
+                        "xmlns:dc",
+                        NS_DC);
+
+                    xDocumentHandler->startElement(
+                        "dc:date",
+                        css::uno::Reference< css::xml::sax::XAttributeList > (pAttributeList));
+
+                    OUStringBuffer buffer;
+                    //If the xml signature was already contained in the document,
+                    //then we use the original date and time string, rather than the
+                    //converted one. This avoids writing a different string due to
+                    //e.g. rounding issues and thus breaking the signature.
+                    if (!signatureInfo.ouDateTime.isEmpty())
+                        buffer = signatureInfo.ouDateTime;
+                    else
+                    {
+                        buffer = utl::toISO8601(signatureInfo.stDateTime);
+                        // xsd:dateTime must use period as separator for fractional seconds, while
+                        // utl::toISO8601 uses comma (as allowed, and even recommended, by ISO8601).
+                        buffer.replace(',', '.');
+                    }
+                    sDate = buffer.makeStringAndClear();
+                    xDocumentHandler->characters( sDate );
+
+                    xDocumentHandler->endElement(
+                        "dc:date");
+                }
+                xDocumentHandler->endElement( "SignatureProperty" );
+            }
+
+            // Write signature description.
+            if (!signatureInfo.ouDescription.isEmpty())
+            {
+                // SignatureProperty element.
+                pAttributeList = new SvXMLAttributeList();
+                pAttributeList->AddAttribute("Id", signatureInfo.ouDescriptionPropertyId);
+                pAttributeList->AddAttribute("Target", "#" + signatureInfo.ouSignatureId);
+                xDocumentHandler->startElement("SignatureProperty", uno::Reference<xml::sax::XAttributeList>(pAttributeList));
+
+                {
+                    // Description element.
+                    pAttributeList = new SvXMLAttributeList();
+                    pAttributeList->AddAttribute("xmlns:dc", NS_DC);
+
+                    xDocumentHandler->startElement("dc:description", uno::Reference<xml::sax::XAttributeList>(pAttributeList));
+                    xDocumentHandler->characters(signatureInfo.ouDescription);
+                    xDocumentHandler->endElement("dc:description");
+                }
+
+                xDocumentHandler->endElement("SignatureProperty");
+            }
+
+            xDocumentHandler->endElement( "SignatureProperties" );
+        }
+        xDocumentHandler->endElement( "Object" );
+
+        //  In XAdES, write another Object element for the QualifyingProperties
+        if (bXAdESCompliantIfODF)
+        {
+            pAttributeList =  new SvXMLAttributeList();
+            pAttributeList->AddAttribute("xmlns:xd", NS_XD);
+            xDocumentHandler->startElement(
+                "Object",
+                css::uno::Reference< css::xml::sax::XAttributeList > (pAttributeList));
+            {
+                pAttributeList = new SvXMLAttributeList();
+                pAttributeList->AddAttribute("Target", "#" + signatureInfo.ouSignatureId);
+                xDocumentHandler->startElement(
+                    "xd:QualifyingProperties",
+                    css::uno::Reference< css::xml::sax::XAttributeList > (pAttributeList));
+                DocumentSignatureHelper::writeSignedProperties(xDocumentHandler, signatureInfo, sDate, true);
+                writeUnsignedProperties(xDocumentHandler, signatureInfo);
+                xDocumentHandler->endElement( "xd:QualifyingProperties" );
+            }
+            xDocumentHandler->endElement( "Object" );
+        }
+    }
+    xDocumentHandler->endElement( "Signature" );
+}
+
+void XSecController::exportOOXMLSignature(const uno::Reference<embed::XStorage>& xRootStorage, const uno::Reference<xml::sax::XDocumentHandler>& xDocumentHandler, const SignatureInformation& rInformation)
+{
+    OOXMLSecExporter aExporter(mxCtx, xRootStorage, xDocumentHandler, rInformation);
+    aExporter.writeSignature();
+}
+
+SignatureInformation XSecController::getSignatureInformation( sal_Int32 nSecurityId ) const
+{
+    SignatureInformation aInf( 0 );
+    int nIndex = findSignatureInfor(nSecurityId);
+    SAL_WARN_IF( nIndex == -1, "xmlsecurity.helper", "getSignatureInformation - SecurityId is invalid!" );
+    if ( nIndex != -1)
+    {
+        aInf = m_vInternalSignatureInformations[nIndex].signatureInfor;
+    }
+    return aInf;
+}
+
+SignatureInformations XSecController::getSignatureInformations() const
+{
+    SignatureInformations vInfors;
+    int sigNum = m_vInternalSignatureInformations.size();
+
+    for (int i=0; i<sigNum; ++i)
+    {
+        SignatureInformation si = m_vInternalSignatureInformations[i].signatureInfor;
+        vInfors.push_back(si);
+    }
+
+    return vInfors;
+}
+
+/*
+ * XSAXEventKeeperStatusChangeListener
+ */
+
+void SAL_CALL XSecController::blockingStatusChanged( sal_Bool isBlocking )
+{
+    m_bIsBlocking = isBlocking;
+    checkChainingStatus();
+}
+
+void SAL_CALL XSecController::collectionStatusChanged(
+    sal_Bool isInsideCollectedElement )
+{
+    m_bIsCollectingElement = isInsideCollectedElement;
+    checkChainingStatus();
+}
+
+void SAL_CALL XSecController::bufferStatusChanged( sal_Bool /*isBufferEmpty*/)
+{
+
+}
+
+/*
+ * XSignatureCreationResultListener
+ */
+void SAL_CALL XSecController::signatureCreated( sal_Int32 securityId, css::xml::crypto::SecurityOperationStatus nResult )
+{
+    int index = findSignatureInfor(securityId);
+    assert(index != -1 && "Signature Not Found!");
+    SignatureInformation& signatureInfor = m_vInternalSignatureInformations.at(index).signatureInfor;
+    signatureInfor.nStatus = nResult;
+}
+
+/*
+ * XSignatureVerifyResultListener
+ */
+void SAL_CALL XSecController::signatureVerified( sal_Int32 securityId, css::xml::crypto::SecurityOperationStatus nResult )
+{
+    int index = findSignatureInfor(securityId);
+    assert(index != -1 && "Signature Not Found!");
+    SignatureInformation& signatureInfor = m_vInternalSignatureInformations.at(index).signatureInfor;
+    signatureInfor.nStatus = nResult;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/helper/xsecparser.cxx b/xmlsecurity/source/helper/xsecparser.cxx
new file mode 100644
index 000000000..9f2bbe074
--- /dev/null
+++ b/xmlsecurity/source/helper/xsecparser.cxx
@@ -0,0 +1,530 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+
+#include "xsecparser.hxx"
+#include <xsecctl.hxx>
+#include <xmlsignaturehelper.hxx>
+#include <com/sun/star/xml/sax/SAXException.hpp>
+#include <cppuhelper/exc_hlp.hxx>
+#include <sal/log.hxx>
+
+
+XSecParser::XSecParser(XMLSignatureHelper& rXMLSignatureHelper,
+    XSecController* pXSecController)
+    : m_bInX509IssuerName(false)
+    , m_bInX509SerialNumber(false)
+    , m_bInX509Certificate(false)
+    , m_bInGpgCertificate(false)
+    , m_bInGpgKeyID(false)
+    , m_bInGpgOwner(false)
+    , m_bInCertDigest(false)
+    , m_bInEncapsulatedX509Certificate(false)
+    , m_bInSigningTime(false)
+    , m_bInDigestValue(false)
+    , m_bInSignatureValue(false)
+    , m_bInDate(false)
+    , m_bInDescription(false)
+    , m_bInSignatureLineId(false)
+    , m_bInSignatureLineValidImage(false)
+    , m_bInSignatureLineInvalidImage(false)
+    , m_pXSecController(pXSecController)
+    , m_bReferenceUnresolved(false)
+    , m_nReferenceDigestID(css::xml::crypto::DigestID::SHA1)
+    , m_rXMLSignatureHelper(rXMLSignatureHelper)
+{
+}
+
+OUString XSecParser::getIdAttr(const css::uno::Reference< css::xml::sax::XAttributeList >& xAttribs )
+{
+    OUString ouIdAttr = xAttribs->getValueByName("id");
+
+    if (ouIdAttr.isEmpty())
+    {
+        ouIdAttr = xAttribs->getValueByName("Id");
+    }
+
+    return ouIdAttr;
+}
+
+/*
+ * XDocumentHandler
+ */
+void SAL_CALL XSecParser::startDocument(  )
+{
+    m_bInX509IssuerName = false;
+    m_bInX509SerialNumber = false;
+    m_bInX509Certificate = false;
+    m_bInGpgCertificate = false;
+    m_bInGpgKeyID = false;
+    m_bInGpgOwner = false;
+    m_bInSignatureValue = false;
+    m_bInDigestValue = false;
+    m_bInDate = false;
+    m_bInDescription = false;
+
+    if (m_xNextHandler.is())
+    {
+        m_xNextHandler->startDocument();
+    }
+}
+
+void SAL_CALL XSecParser::endDocument(  )
+{
+    if (m_xNextHandler.is())
+    {
+        m_xNextHandler->endDocument();
+    }
+}
+
+void SAL_CALL XSecParser::startElement(
+    const OUString& aName,
+    const css::uno::Reference< css::xml::sax::XAttributeList >& xAttribs )
+{
+    try
+    {
+        OUString ouIdAttr = getIdAttr(xAttribs);
+        if (!ouIdAttr.isEmpty())
+        {
+            m_pXSecController->collectToVerify( ouIdAttr );
+        }
+
+        if ( aName == "Signature" )
+        {
+            m_rXMLSignatureHelper.StartVerifySignatureElement();
+            m_pXSecController->addSignature();
+            if (!ouIdAttr.isEmpty())
+            {
+                m_pXSecController->setId( ouIdAttr );
+            }
+        }
+        else if (aName == "SignatureMethod")
+        {
+            OUString ouAlgorithm = xAttribs->getValueByName("Algorithm");
+            if (ouAlgorithm == ALGO_ECDSASHA1 || ouAlgorithm == ALGO_ECDSASHA256
+                || ouAlgorithm == ALGO_ECDSASHA512)
+                m_pXSecController->setSignatureMethod(svl::crypto::SignatureMethodAlgorithm::ECDSA);
+        }
+        else if ( aName == "Reference" )
+        {
+            OUString ouUri = xAttribs->getValueByName("URI");
+            SAL_WARN_IF( ouUri.isEmpty(), "xmlsecurity.helper", "URI is empty" );
+            // Remember the type of this reference.
+            OUString ouType = xAttribs->getValueByName("Type");
+            if (ouUri.startsWith("#"))
+            {
+                /*
+                * remove the first character '#' from the attribute value
+                */
+                m_pXSecController->addReference( ouUri.copy(1), m_nReferenceDigestID, ouType );
+            }
+            else
+            {
+                /*
+                * remember the uri
+                */
+                m_currentReferenceURI = ouUri;
+                m_bReferenceUnresolved = true;
+            }
+        }
+        else if (aName == "DigestMethod")
+        {
+            OUString ouAlgorithm = xAttribs->getValueByName("Algorithm");
+
+            SAL_WARN_IF( ouAlgorithm.isEmpty(), "xmlsecurity.helper", "no Algorithm in Reference" );
+            if (!ouAlgorithm.isEmpty())
+            {
+                SAL_WARN_IF( ouAlgorithm != ALGO_XMLDSIGSHA1
+                             && ouAlgorithm != ALGO_XMLDSIGSHA256
+                             && ouAlgorithm != ALGO_XMLDSIGSHA512,
+                             "xmlsecurity.helper", "Algorithm neither SHA1, SHA256 nor SHA512");
+                if (ouAlgorithm == ALGO_XMLDSIGSHA1)
+                    m_nReferenceDigestID = css::xml::crypto::DigestID::SHA1;
+                else if (ouAlgorithm == ALGO_XMLDSIGSHA256)
+                    m_nReferenceDigestID = css::xml::crypto::DigestID::SHA256;
+                else if (ouAlgorithm == ALGO_XMLDSIGSHA512)
+                    m_nReferenceDigestID = css::xml::crypto::DigestID::SHA512;
+                else
+                    m_nReferenceDigestID = 0;
+            }
+        }
+        else if (aName == "Transform")
+        {
+            if ( m_bReferenceUnresolved )
+            {
+                OUString ouAlgorithm = xAttribs->getValueByName("Algorithm");
+
+                if (ouAlgorithm == ALGO_C14N)
+                    /*
+                     * a xml stream
+                     */
+                {
+                    m_pXSecController->addStreamReference( m_currentReferenceURI, false, m_nReferenceDigestID );
+                    m_bReferenceUnresolved = false;
+                }
+            }
+        }
+        else if (aName == "X509IssuerName")
+        {
+            m_ouX509IssuerName.clear();
+            m_bInX509IssuerName = true;
+        }
+        else if (aName == "X509SerialNumber")
+        {
+            m_ouX509SerialNumber.clear();
+            m_bInX509SerialNumber = true;
+        }
+        else if (aName == "X509Certificate")
+        {
+            m_ouX509Certificate.clear();
+            m_bInX509Certificate = true;
+        }
+        else if (aName == "PGPData")
+        {
+            m_pXSecController->switchGpgSignature();
+        }
+        else if (aName == "PGPKeyID")
+        {
+            m_ouGpgKeyID.clear();
+            m_bInGpgKeyID = true;
+        }
+        else if (aName == "PGPKeyPacket")
+        {
+            m_ouGpgCertificate.clear();
+            m_bInGpgCertificate = true;
+        }
+        else if (aName == "loext:PGPOwner")
+        {
+            m_ouGpgOwner.clear();
+            m_bInGpgOwner = true;
+        }
+        else if (aName == "SignatureValue")
+        {
+            m_ouSignatureValue.clear();
+            m_bInSignatureValue = true;
+        }
+        else if (aName == "DigestValue" && !m_bInCertDigest)
+        {
+            m_ouDigestValue.clear();
+            m_bInDigestValue = true;
+        }
+        else if (aName == "xd:CertDigest")
+        {
+            m_ouCertDigest.clear();
+            m_bInCertDigest = true;
+        }
+        // FIXME: Existing code here in xmlsecurity uses "xd" as the namespace prefix for XAdES,
+        // while the sample document attached to tdf#76142 uses "xades". So accept either here. Of
+        // course this is idiotic and wrong, the right thing would be to use a proper way to parse
+        // XML that would handle namespaces correctly. I have no idea how substantial re-plumbing of
+        // this code that would require.
+        else if (aName == "xd:EncapsulatedX509Certificate" || aName == "xades:EncapsulatedX509Certificate")
+        {
+            m_ouEncapsulatedX509Certificate.clear();
+            m_bInEncapsulatedX509Certificate = true;
+        }
+        else if (aName == "xd:SigningTime" || aName == "xades:SigningTime")
+        {
+            m_ouDate.clear();
+            m_bInSigningTime = true;
+        }
+        else if ( aName == "SignatureProperty" )
+        {
+            if (!ouIdAttr.isEmpty())
+            {
+                m_pXSecController->setPropertyId( ouIdAttr );
+            }
+        }
+        else if (aName == "dc:date")
+        {
+            if (m_ouDate.isEmpty())
+                m_bInDate = true;
+        }
+        else if (aName == "dc:description")
+        {
+            m_ouDescription.clear();
+            m_bInDescription = true;
+        }
+        else if (aName == "loext:SignatureLineId")
+        {
+            m_ouSignatureLineId.clear();
+            m_bInSignatureLineId = true;
+        }
+        else if (aName == "loext:SignatureLineValidImage")
+        {
+            m_ouSignatureLineValidImage.clear();
+            m_bInSignatureLineValidImage = true;
+        }
+        else if (aName == "loext:SignatureLineInvalidImage")
+        {
+            m_ouSignatureLineInvalidImage.clear();
+            m_bInSignatureLineInvalidImage = true;
+        }
+
+        if (m_xNextHandler.is())
+        {
+            m_xNextHandler->startElement(aName, xAttribs);
+        }
+    }
+    catch (css::uno::Exception& )
+    {//getCaughtException MUST be the first line in the catch block
+        css::uno::Any exc =  cppu::getCaughtException();
+        throw css::xml::sax::SAXException(
+            "xmlsecurity: Exception in XSecParser::startElement",
+            nullptr, exc);
+    }
+    catch (...)
+    {
+        throw css::xml::sax::SAXException(
+            "xmlsecurity: unexpected exception in XSecParser::startElement", nullptr,
+            css::uno::Any());
+    }
+}
+
+void SAL_CALL XSecParser::endElement( const OUString& aName )
+{
+    try
+    {
+        if (aName == "DigestValue" && !m_bInCertDigest)
+        {
+            m_bInDigestValue = false;
+        }
+        else if ( aName == "Reference" )
+        {
+            if ( m_bReferenceUnresolved )
+            /*
+            * it must be an octet stream
+            */
+            {
+                m_pXSecController->addStreamReference( m_currentReferenceURI, true, m_nReferenceDigestID );
+                m_bReferenceUnresolved = false;
+            }
+
+            m_pXSecController->setDigestValue( m_nReferenceDigestID, m_ouDigestValue );
+        }
+        else if ( aName == "SignedInfo" )
+        {
+            m_pXSecController->setReferenceCount();
+        }
+        else if ( aName == "SignatureValue" )
+        {
+            m_pXSecController->setSignatureValue( m_ouSignatureValue );
+            m_bInSignatureValue = false;
+        }
+        else if (aName == "X509IssuerName")
+        {
+            m_pXSecController->setX509IssuerName( m_ouX509IssuerName );
+            m_bInX509IssuerName = false;
+        }
+        else if (aName == "X509SerialNumber")
+        {
+            m_pXSecController->setX509SerialNumber( m_ouX509SerialNumber );
+            m_bInX509SerialNumber = false;
+        }
+        else if (aName == "X509Certificate")
+        {
+            m_pXSecController->setX509Certificate( m_ouX509Certificate );
+            m_bInX509Certificate = false;
+        }
+        else if (aName == "PGPKeyID")
+        {
+            m_pXSecController->setGpgKeyID( m_ouGpgKeyID );
+            m_bInGpgKeyID = false;
+        }
+        else if (aName == "PGPKeyPacket")
+        {
+            m_pXSecController->setGpgCertificate( m_ouGpgCertificate );
+            m_bInGpgCertificate = false;
+        }
+        else if (aName == "loext:PGPOwner")
+        {
+            m_pXSecController->setGpgOwner( m_ouGpgOwner );
+            m_bInGpgOwner = false;
+        }
+        else if (aName == "xd:CertDigest")
+        {
+            m_pXSecController->setCertDigest( m_ouCertDigest );
+            m_bInCertDigest = false;
+        }
+        else if (aName == "xd:EncapsulatedX509Certificate" || aName == "xades:EncapsulatedX509Certificate")
+        {
+            m_pXSecController->addEncapsulatedX509Certificate( m_ouEncapsulatedX509Certificate );
+            m_bInEncapsulatedX509Certificate = false;
+        }
+        else if (aName == "xd:SigningTime" || aName == "xades:SigningTime")
+        {
+            m_pXSecController->setDate( m_ouDate );
+            m_bInSigningTime = false;
+        }
+        else if (aName == "dc:date")
+        {
+            if (m_bInDate)
+            {
+                m_pXSecController->setDate( m_ouDate );
+                m_bInDate = false;
+            }
+        }
+        else if (aName == "dc:description")
+        {
+            m_pXSecController->setDescription( m_ouDescription );
+            m_bInDescription = false;
+        }
+        else if (aName == "loext:SignatureLineId")
+        {
+            m_pXSecController->setSignatureLineId( m_ouSignatureLineId );
+            m_bInSignatureLineId = false;
+        }
+        else if (aName == "loext:SignatureLineValidImage")
+        {
+            m_pXSecController->setValidSignatureImage( m_ouSignatureLineValidImage );
+            m_bInSignatureLineValidImage = false;
+        }
+        else if (aName == "loext:SignatureLineInvalidImage")
+        {
+            m_pXSecController->setInvalidSignatureImage( m_ouSignatureLineInvalidImage );
+            m_bInSignatureLineInvalidImage = false;
+        }
+
+        if (m_xNextHandler.is())
+        {
+            m_xNextHandler->endElement(aName);
+        }
+    }
+    catch (css::uno::Exception& )
+    {//getCaughtException MUST be the first line in the catch block
+        css::uno::Any exc =  cppu::getCaughtException();
+        throw css::xml::sax::SAXException(
+            "xmlsecurity: Exception in XSecParser::endElement",
+            nullptr, exc);
+    }
+    catch (...)
+    {
+        throw css::xml::sax::SAXException(
+            "xmlsecurity: unexpected exception in XSecParser::endElement", nullptr,
+            css::uno::Any());
+    }
+}
+
+void SAL_CALL XSecParser::characters( const OUString& aChars )
+{
+    if (m_bInX509IssuerName)
+    {
+        m_ouX509IssuerName += aChars;
+    }
+    else if (m_bInX509SerialNumber)
+    {
+        m_ouX509SerialNumber += aChars;
+    }
+    else if (m_bInX509Certificate)
+    {
+        m_ouX509Certificate += aChars;
+    }
+    else if (m_bInGpgCertificate)
+    {
+        m_ouGpgCertificate += aChars;
+    }
+    else if (m_bInGpgKeyID)
+    {
+        m_ouGpgKeyID += aChars;
+    }
+    else if (m_bInGpgOwner)
+    {
+        m_ouGpgOwner += aChars;
+    }
+    else if (m_bInSignatureValue)
+    {
+        m_ouSignatureValue += aChars;
+    }
+    else if (m_bInDigestValue && !m_bInCertDigest)
+    {
+        m_ouDigestValue += aChars;
+    }
+    else if (m_bInDate)
+    {
+        m_ouDate += aChars;
+    }
+    else if (m_bInDescription)
+    {
+        m_ouDescription += aChars;
+    }
+    else if (m_bInCertDigest)
+    {
+        m_ouCertDigest += aChars;
+    }
+    else if (m_bInEncapsulatedX509Certificate)
+    {
+        m_ouEncapsulatedX509Certificate += aChars;
+    }
+    else if (m_bInSigningTime)
+    {
+        m_ouDate += aChars;
+    }
+    else if (m_bInSignatureLineId)
+    {
+        m_ouSignatureLineId += aChars;
+    }
+    else if (m_bInSignatureLineValidImage)
+    {
+        m_ouSignatureLineValidImage += aChars;
+    }
+    else if (m_bInSignatureLineInvalidImage)
+    {
+        m_ouSignatureLineInvalidImage += aChars;
+    }
+
+    if (m_xNextHandler.is())
+    {
+        m_xNextHandler->characters(aChars);
+    }
+}
+
+void SAL_CALL XSecParser::ignorableWhitespace( const OUString& aWhitespaces )
+{
+    if (m_xNextHandler.is())
+    {
+        m_xNextHandler->ignorableWhitespace( aWhitespaces );
+    }
+}
+
+void SAL_CALL XSecParser::processingInstruction( const OUString& aTarget, const OUString& aData )
+{
+    if (m_xNextHandler.is())
+    {
+        m_xNextHandler->processingInstruction(aTarget, aData);
+    }
+}
+
+void SAL_CALL XSecParser::setDocumentLocator( const css::uno::Reference< css::xml::sax::XLocator >& xLocator )
+{
+    if (m_xNextHandler.is())
+    {
+        m_xNextHandler->setDocumentLocator( xLocator );
+    }
+}
+
+/*
+ * XInitialization
+ */
+void SAL_CALL XSecParser::initialize(
+    const css::uno::Sequence< css::uno::Any >& aArguments )
+{
+    aArguments[0] >>= m_xNextHandler;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/helper/xsecparser.hxx b/xmlsecurity/source/helper/xsecparser.hxx
new file mode 100644
index 000000000..d9b079aa3
--- /dev/null
+++ b/xmlsecurity/source/helper/xsecparser.hxx
@@ -0,0 +1,162 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#ifndef INCLUDED_XMLSECURITY_SOURCE_HELPER_XSECPARSER_HXX
+#define INCLUDED_XMLSECURITY_SOURCE_HELPER_XSECPARSER_HXX
+
+#include <com/sun/star/lang/XInitialization.hpp>
+#include <com/sun/star/xml/sax/XDocumentHandler.hpp>
+
+#include <cppuhelper/implbase.hxx>
+
+class XMLSignatureHelper;
+class XSecController;
+
+class XSecParser: public cppu::WeakImplHelper
+<
+    css::xml::sax::XDocumentHandler,
+    css::lang::XInitialization
+>
+/****** XSecController.hxx/CLASS XSecParser ***********************************
+ *
+ *   NAME
+ *  XSecParser -- a SAX parser that can detect security elements
+ *
+ *   FUNCTION
+ *  The XSecParser object is connected on the SAX chain and detects
+ *  security elements in the SAX event stream, then notifies
+ *  the XSecController.
+ *
+ *   NOTES
+ *  This class is used when importing a document.
+ ******************************************************************************/
+{
+    friend class XSecController;
+private:
+    /*
+     * the following members are used to reserve the signature information,
+     * including X509IssuerName, X509SerialNumber, and X509Certificate,etc.
+     */
+    OUString m_ouX509IssuerName;
+    OUString m_ouX509SerialNumber;
+    OUString m_ouX509Certificate;
+    OUString m_ouGpgCertificate;
+    OUString m_ouGpgKeyID;
+    OUString m_ouGpgOwner;
+    OUString m_ouCertDigest;
+    OUString m_ouEncapsulatedX509Certificate;
+    OUString m_ouDigestValue;
+    OUString m_ouSignatureValue;
+    OUString m_ouDate;
+    /// Characters of a <dc:description> element, as just read from XML.
+    OUString m_ouDescription;
+    OUString m_ouSignatureLineId;
+    OUString m_ouSignatureLineValidImage;
+    OUString m_ouSignatureLineInvalidImage;
+
+    /*
+     * whether inside a particular element
+     */
+    bool m_bInX509IssuerName;
+    bool m_bInX509SerialNumber;
+    bool m_bInX509Certificate;
+    bool m_bInGpgCertificate;
+    bool m_bInGpgKeyID;
+    bool m_bInGpgOwner;
+    bool m_bInCertDigest;
+    bool m_bInEncapsulatedX509Certificate;
+    bool m_bInSigningTime;
+    bool m_bInDigestValue;
+    bool m_bInSignatureValue;
+    bool m_bInDate;
+    bool m_bInDescription;
+    bool m_bInSignatureLineId;
+    bool m_bInSignatureLineValidImage;
+    bool m_bInSignatureLineInvalidImage;
+
+    /*
+     * the XSecController collaborating with XSecParser
+     */
+    XSecController* m_pXSecController;
+
+    /*
+     * the next XDocumentHandler on the SAX chain
+     */
+    css::uno::Reference<
+        css::xml::sax::XDocumentHandler > m_xNextHandler;
+
+    /*
+     * this string is used to remember the current handled reference's URI,
+     *
+     * because it can be decided whether a stream reference is xml based or binary based
+     * only after the Transforms element is read in, so we have to reserve the reference's
+     * URI when the startElement event is met.
+     */
+    OUString m_currentReferenceURI;
+    bool m_bReferenceUnresolved;
+
+    // Relevant for ODF. The digest algorithm selected by the current DigestMethod element's
+    // Algorithm attribute in the current Reference element. From css::xml::crypto::DigestID.
+    sal_Int32 m_nReferenceDigestID;
+    XMLSignatureHelper& m_rXMLSignatureHelper;
+
+private:
+    static OUString getIdAttr(const css::uno::Reference<
+            css::xml::sax::XAttributeList >& xAttribs );
+
+public:
+    XSecParser(XMLSignatureHelper& rXMLSignatureHelper, XSecController* pXSecController);
+
+    /*
+     * XDocumentHandler
+     */
+    virtual void SAL_CALL startDocument(  ) override;
+
+    virtual void SAL_CALL endDocument(  ) override;
+
+    virtual void SAL_CALL startElement(
+        const OUString& aName,
+        const css::uno::Reference<
+            css::xml::sax::XAttributeList >& xAttribs ) override;
+
+    virtual void SAL_CALL endElement( const OUString& aName ) override;
+
+    virtual void SAL_CALL characters( const OUString& aChars ) override;
+
+    virtual void SAL_CALL ignorableWhitespace( const OUString& aWhitespaces ) override;
+
+    virtual void SAL_CALL processingInstruction(
+        const OUString& aTarget,
+        const OUString& aData ) override;
+
+    virtual void SAL_CALL setDocumentLocator(
+        const css::uno::Reference<
+            css::xml::sax::XLocator >& xLocator ) override;
+
+    /*
+     * XInitialization
+     */
+    virtual void SAL_CALL initialize(
+        const css::uno::Sequence< css::uno::Any >& aArguments ) override;
+};
+
+#endif
+
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/helper/xsecsign.cxx b/xmlsecurity/source/helper/xsecsign.cxx
new file mode 100644
index 000000000..b9648ed64
--- /dev/null
+++ b/xmlsecurity/source/helper/xsecsign.cxx
@@ -0,0 +1,447 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+
+#include <xsecctl.hxx>
+
+#include <com/sun/star/xml/crypto/sax/ElementMarkPriority.hpp>
+#include <com/sun/star/embed/StorageFormats.hpp>
+#include <rtl/uuid.h>
+#include <sal/log.hxx>
+
+#include <framework/signaturecreatorimpl.hxx>
+#include <framework/saxeventkeeperimpl.hxx>
+
+namespace com::sun::star::graphic { class XGraphic; }
+
+using namespace css;
+using namespace css::uno;
+using namespace css::graphic;
+
+/* protected: for signature generation */
+OUString XSecController::createId()
+{
+    sal_uInt8 aSeq[16];
+    rtl_createUuid( aSeq, nullptr, true );
+
+    char str[68]="ID_";
+    int length = 3;
+    for (sal_uInt8 i : aSeq)
+    {
+        length += sprintf(str+length, "%04x", i);
+    }
+
+    return OUString::createFromAscii(str);
+}
+
+css::uno::Reference< css::xml::crypto::sax::XReferenceResolvedListener > XSecController::prepareSignatureToWrite(
+    InternalSignatureInformation& internalSignatureInfor,
+    sal_Int32 nStorageFormat,
+    bool bXAdESCompliantIfODF)
+{
+    sal_Int32 nSecurityId = internalSignatureInfor.signatureInfor.nSecurityId;
+    SignatureReferenceInformations& vReferenceInfors = internalSignatureInfor.signatureInfor.vSignatureReferenceInfors;
+
+    sal_Int32 nIdOfSignatureElementCollector;
+
+    nIdOfSignatureElementCollector =
+        m_xSAXEventKeeper->addSecurityElementCollector( css::xml::crypto::sax::ElementMarkPriority_AFTERMODIFY, true );
+
+    m_xSAXEventKeeper->setSecurityId(nIdOfSignatureElementCollector, nSecurityId);
+
+    rtl::Reference<SignatureCreatorImpl> xSignatureCreator(new SignatureCreatorImpl);
+
+    css::uno::Sequence<css::uno::Any> args(5);
+    args[0] <<= OUString::number(nSecurityId);
+    args[1] <<= uno::Reference<xml::crypto::sax::XSecuritySAXEventKeeper>(static_cast<cppu::OWeakObject*>(m_xSAXEventKeeper.get()), uno::UNO_QUERY);
+    args[2] <<= OUString::number(nIdOfSignatureElementCollector);
+
+    //for nss, the internal module is used for signing, which needs to be improved later
+    args[3] <<= m_xSecurityContext->getSecurityEnvironment();
+
+    args[4] <<= m_xXMLSignature;
+    xSignatureCreator->initialize(args);
+
+    sal_Int32 nBlockerId = m_xSAXEventKeeper->addBlocker();
+    m_xSAXEventKeeper->setSecurityId(nBlockerId, nSecurityId);
+
+    xSignatureCreator->setBlockerId(nBlockerId);
+
+    xSignatureCreator->addSignatureCreationResultListener(this);
+
+    m_xSAXEventKeeper->addReferenceResolvedListener(nIdOfSignatureElementCollector, xSignatureCreator.get());
+
+    int size = vReferenceInfors.size();
+    sal_Int32 nReferenceCount = 0;
+
+    for(int i=0; i<size; ++i)
+    {
+        sal_Int32 keeperId = internalSignatureInfor.vKeeperIds[i];
+
+        if ( keeperId != -1)
+        {
+            m_xSAXEventKeeper->setSecurityId(keeperId, nSecurityId);
+            m_xSAXEventKeeper->addReferenceResolvedListener( keeperId, xSignatureCreator.get());
+            xSignatureCreator->setReferenceId( keeperId );
+            nReferenceCount++;
+        }
+    }
+
+    xSignatureCreator->setReferenceCount( nReferenceCount );
+
+    /*
+     * adds all URI binding
+     */
+    for(int i=0; i<size; ++i)
+    {
+        const SignatureReferenceInformation& refInfor = vReferenceInfors[i];
+
+        css::uno::Reference< css::io::XInputStream > xInputStream
+            = getObjectInputStream( refInfor.ouURI );
+
+        if (xInputStream.is())
+            xSignatureCreator->setUriBinding(refInfor.ouURI,xInputStream);
+    }
+
+    xSignatureCreator->setKeyId(0);
+
+    // use sha512 for gpg signing unconditionally
+    const sal_Int32 digestID = !internalSignatureInfor.signatureInfor.ouGpgCertificate.isEmpty()?
+        css::xml::crypto::DigestID::SHA512 : (bXAdESCompliantIfODF ? css::xml::crypto::DigestID::SHA256 : css::xml::crypto::DigestID::SHA1);
+
+    if (nStorageFormat != embed::StorageFormats::OFOPXML)
+    {
+        internalSignatureInfor.signatureInfor.ouSignatureId = createId();
+        internalSignatureInfor.signatureInfor.ouPropertyId = createId();
+        internalSignatureInfor.addReference(SignatureReferenceType::SAMEDOCUMENT, digestID, internalSignatureInfor.signatureInfor.ouPropertyId, -1, OUString() );
+        size++;
+
+        if (bXAdESCompliantIfODF)
+        {
+            // We write a new reference, so it's possible to use the correct type URI.
+            internalSignatureInfor.addReference(SignatureReferenceType::SAMEDOCUMENT, digestID, "idSignedProperties", -1, "http://uri.etsi.org/01903#SignedProperties");
+            size++;
+        }
+
+        if (!internalSignatureInfor.signatureInfor.ouDescription.isEmpty())
+        {
+            // Only mention the hash of the description in the signature if it's non-empty.
+            internalSignatureInfor.signatureInfor.ouDescriptionPropertyId = createId();
+            internalSignatureInfor.addReference(SignatureReferenceType::SAMEDOCUMENT, digestID, internalSignatureInfor.signatureInfor.ouDescriptionPropertyId, -1, OUString());
+            size++;
+        }
+    }
+    else
+    {
+        internalSignatureInfor.addReference(SignatureReferenceType::SAMEDOCUMENT, digestID, "idPackageObject", -1, OUString());
+        size++;
+        internalSignatureInfor.addReference(SignatureReferenceType::SAMEDOCUMENT, digestID, "idOfficeObject", -1, OUString());
+        size++;
+        internalSignatureInfor.addReference(SignatureReferenceType::SAMEDOCUMENT, digestID, "idSignedProperties", -1, OUString());
+        size++;
+    }
+
+    /*
+     * replace both digestValues and signatureValue to " "
+     */
+    for(int i=0; i<size; ++i)
+    {
+        SignatureReferenceInformation& refInfor = vReferenceInfors[i];
+        refInfor.ouDigestValue = " ";
+    }
+
+    internalSignatureInfor.signatureInfor.ouSignatureValue = " ";
+
+    return xSignatureCreator.get();
+}
+
+void XSecController::signAStream( sal_Int32 securityId, const OUString& uri, bool isBinary, bool bXAdESCompliantIfODF)
+{
+    const SignatureReferenceType type = isBinary ? SignatureReferenceType::BINARYSTREAM : SignatureReferenceType::XMLSTREAM;
+    sal_Int32 digestID = bXAdESCompliantIfODF ? css::xml::crypto::DigestID::SHA256 : css::xml::crypto::DigestID::SHA1;
+
+    int index = findSignatureInfor( securityId );
+
+    if (index == -1)
+    {
+        InternalSignatureInformation isi(securityId, nullptr);
+        isi.addReference(type, digestID, uri, -1, OUString());
+        m_vInternalSignatureInformations.push_back( isi );
+    }
+    else
+    {
+        // use sha512 for gpg signing unconditionally
+        if (!m_vInternalSignatureInformations[index].signatureInfor.ouGpgCertificate.isEmpty())
+            digestID = css::xml::crypto::DigestID::SHA512;
+        m_vInternalSignatureInformations[index].addReference(type, digestID, uri, -1, OUString());
+    }
+}
+
+void XSecController::setX509Certificate(
+    sal_Int32 nSecurityId,
+    const OUString& ouX509IssuerName,
+    const OUString& ouX509SerialNumber,
+    const OUString& ouX509Cert,
+    const OUString& ouX509CertDigest,
+    svl::crypto::SignatureMethodAlgorithm eAlgorithmID)
+{
+    int index = findSignatureInfor( nSecurityId );
+
+    if ( index == -1 )
+    {
+        InternalSignatureInformation isi(nSecurityId, nullptr);
+        isi.signatureInfor.ouX509IssuerName = ouX509IssuerName;
+        isi.signatureInfor.ouX509SerialNumber = ouX509SerialNumber;
+        isi.signatureInfor.ouX509Certificate = ouX509Cert;
+        isi.signatureInfor.ouCertDigest = ouX509CertDigest;
+        isi.signatureInfor.eAlgorithmID = eAlgorithmID;
+        m_vInternalSignatureInformations.push_back( isi );
+    }
+    else
+    {
+        SignatureInformation &si
+            = m_vInternalSignatureInformations[index].signatureInfor;
+        si.ouX509IssuerName = ouX509IssuerName;
+        si.ouX509SerialNumber = ouX509SerialNumber;
+        si.ouX509Certificate = ouX509Cert;
+        si.ouCertDigest = ouX509CertDigest;
+    }
+}
+
+void XSecController::setGpgCertificate(
+        sal_Int32 nSecurityId,
+        const OUString& ouCertDigest,
+        const OUString& ouCert,
+        const OUString& ouOwner)
+{
+    int index = findSignatureInfor( nSecurityId );
+
+    if ( index == -1 )
+    {
+        InternalSignatureInformation isi(nSecurityId, nullptr);
+        isi.signatureInfor.ouGpgCertificate = ouCert;
+        isi.signatureInfor.ouGpgOwner = ouOwner;
+        isi.signatureInfor.ouCertDigest = ouCertDigest;
+        m_vInternalSignatureInformations.push_back( isi );
+    }
+    else
+    {
+        SignatureInformation &si
+            = m_vInternalSignatureInformations[index].signatureInfor;
+        si.ouGpgCertificate = ouCert;
+        si.ouGpgOwner = ouOwner;
+        si.ouCertDigest = ouCertDigest;
+    }
+}
+
+void XSecController::setDate(
+    sal_Int32 nSecurityId,
+    const css::util::DateTime& rDateTime )
+{
+    int index = findSignatureInfor( nSecurityId );
+
+    if ( index == -1 )
+    {
+        InternalSignatureInformation isi(nSecurityId, nullptr);
+        isi.signatureInfor.stDateTime = rDateTime;
+        m_vInternalSignatureInformations.push_back( isi );
+    }
+    else
+    {
+        SignatureInformation &si
+            = m_vInternalSignatureInformations[index].signatureInfor;
+        si.stDateTime = rDateTime;
+    }
+}
+
+void XSecController::setDescription(sal_Int32 nSecurityId, const OUString& rDescription)
+{
+    int nIndex = findSignatureInfor(nSecurityId);
+
+    if (nIndex == -1)
+    {
+        InternalSignatureInformation aInformation(nSecurityId, nullptr);
+        aInformation.signatureInfor.ouDescription = rDescription;
+        m_vInternalSignatureInformations.push_back(aInformation);
+    }
+    else
+    {
+        SignatureInformation& rInformation = m_vInternalSignatureInformations[nIndex].signatureInfor;
+        rInformation.ouDescription = rDescription;
+    }
+}
+
+void XSecController::setSignatureLineId(sal_Int32 nSecurityId, const OUString& rSignatureLineId)
+{
+    int nIndex = findSignatureInfor(nSecurityId);
+
+    if (nIndex == -1)
+    {
+        InternalSignatureInformation aInformation(nSecurityId, nullptr);
+        aInformation.signatureInfor.ouSignatureLineId = rSignatureLineId;
+        m_vInternalSignatureInformations.push_back(aInformation);
+    }
+    else
+    {
+        SignatureInformation& rInformation = m_vInternalSignatureInformations[nIndex].signatureInfor;
+        rInformation.ouSignatureLineId = rSignatureLineId;
+    }
+}
+
+void XSecController::setSignatureLineValidGraphic(sal_Int32 nSecurityId,
+                                                  const Reference<XGraphic>& xValidGraphic)
+{
+    int nIndex = findSignatureInfor(nSecurityId);
+
+    if (nIndex == -1)
+    {
+        InternalSignatureInformation aInformation(nSecurityId, nullptr);
+        aInformation.signatureInfor.aValidSignatureImage = xValidGraphic;
+        m_vInternalSignatureInformations.push_back(aInformation);
+    }
+    else
+    {
+        SignatureInformation& rInformation
+            = m_vInternalSignatureInformations[nIndex].signatureInfor;
+        rInformation.aValidSignatureImage = xValidGraphic;
+    }
+}
+
+void XSecController::setSignatureLineInvalidGraphic(
+    sal_Int32 nSecurityId, const Reference<XGraphic>& xInvalidGraphic)
+{
+    int nIndex = findSignatureInfor(nSecurityId);
+
+    if (nIndex == -1)
+    {
+        InternalSignatureInformation aInformation(nSecurityId, nullptr);
+        aInformation.signatureInfor.aInvalidSignatureImage = xInvalidGraphic;
+        m_vInternalSignatureInformations.push_back(aInformation);
+    }
+    else
+    {
+        SignatureInformation& rInformation
+            = m_vInternalSignatureInformations[nIndex].signatureInfor;
+        rInformation.aInvalidSignatureImage = xInvalidGraphic;
+    }
+}
+
+bool XSecController::WriteSignature(
+    const css::uno::Reference<css::xml::sax::XDocumentHandler>& xDocumentHandler,
+    bool bXAdESCompliantIfODF )
+{
+    bool rc = false;
+
+    SAL_WARN_IF( !xDocumentHandler.is(), "xmlsecurity.helper", "I really need a document handler!" );
+
+    /*
+     * chain the SAXEventKeeper to the SAX chain
+     */
+    chainOn();
+
+    if ( m_eStatusOfSecurityComponents == InitializationState::INITIALIZED )
+    /*
+     * if all security components are ready, add the signature
+     * stream.
+     */
+    {
+        m_bIsSAXEventKeeperSticky = true;
+        m_xSAXEventKeeper->setNextHandler(xDocumentHandler);
+
+        try
+        {
+            /*
+             * export the signature template
+             */
+            css::uno::Reference<css::xml::sax::XDocumentHandler> xSEKHandler(static_cast<cppu::OWeakObject*>(m_xSAXEventKeeper.get()),css::uno::UNO_QUERY);
+
+            int i;
+            int sigNum = m_vInternalSignatureInformations.size();
+
+            for (i=0; i<sigNum; ++i)
+            {
+                InternalSignatureInformation &isi = m_vInternalSignatureInformations[i];
+
+                // Prepare the signature creator.
+                // 0 is not a documented value of embed::StorageFormats, ugh
+                isi.xReferenceResolvedListener = prepareSignatureToWrite( isi, 0, bXAdESCompliantIfODF );
+
+                exportSignature( xSEKHandler, isi.signatureInfor, bXAdESCompliantIfODF );
+            }
+
+            m_bIsSAXEventKeeperSticky = false;
+            chainOff();
+
+            rc = true;
+        }
+        catch( css::uno::Exception& )
+        {
+        }
+
+        m_xSAXEventKeeper->setNextHandler( nullptr );
+        m_bIsSAXEventKeeperSticky = false;
+    }
+
+    return rc;
+}
+
+bool XSecController::WriteOOXMLSignature(const uno::Reference<embed::XStorage>& xRootStorage, const uno::Reference<xml::sax::XDocumentHandler>& xDocumentHandler)
+{
+    bool bRet = false;
+
+    SAL_WARN_IF(!xDocumentHandler.is(), "xmlsecurity.helper", "empty xDocumentHandler reference");
+
+    // Chain the SAXEventKeeper to the SAX chain.
+    chainOn();
+
+    if (m_eStatusOfSecurityComponents == InitializationState::INITIALIZED)
+    {
+        m_bIsSAXEventKeeperSticky = true;
+        m_xSAXEventKeeper->setNextHandler(xDocumentHandler);
+
+        try
+        {
+            // Export the signature template.
+            css::uno::Reference<xml::sax::XDocumentHandler> xSEKHandler(static_cast<cppu::OWeakObject*>(m_xSAXEventKeeper.get()), uno::UNO_QUERY);
+
+            for (InternalSignatureInformation & rInformation : m_vInternalSignatureInformations)
+            {
+                // Prepare the signature creator.
+                rInformation.xReferenceResolvedListener = prepareSignatureToWrite(rInformation, embed::StorageFormats::OFOPXML, false);
+
+                exportOOXMLSignature(xRootStorage, xSEKHandler, rInformation.signatureInfor);
+            }
+
+            m_bIsSAXEventKeeperSticky = false;
+            chainOff();
+
+            bRet = true;
+        }
+        catch(const uno::Exception&)
+        {
+        }
+
+        m_xSAXEventKeeper->setNextHandler(nullptr);
+        m_bIsSAXEventKeeperSticky = false;
+    }
+
+    return bRet;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/helper/xsecverify.cxx b/xmlsecurity/source/helper/xsecverify.cxx
new file mode 100644
index 000000000..c826971b1
--- /dev/null
+++ b/xmlsecurity/source/helper/xsecverify.cxx
@@ -0,0 +1,537 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <config_gpgme.h>
+
+#include <xsecctl.hxx>
+#include "xsecparser.hxx"
+#include "ooxmlsecparser.hxx"
+#include <framework/signatureverifierimpl.hxx>
+#include <framework/saxeventkeeperimpl.hxx>
+#include <gpg/xmlsignature_gpgimpl.hxx>
+#include <gpg/SEInitializer.hxx>
+
+#include <com/sun/star/uno/Sequence.hxx>
+#include <com/sun/star/xml/crypto/sax/XKeyCollector.hpp>
+#include <com/sun/star/xml/crypto/sax/ElementMarkPriority.hpp>
+#include <com/sun/star/xml/crypto/sax/XReferenceCollector.hpp>
+#include <com/sun/star/xml/crypto/sax/XSignatureVerifyResultBroadcaster.hpp>
+#include <com/sun/star/xml/crypto/XSEInitializer.hpp>
+#include <com/sun/star/graphic/GraphicProvider.hpp>
+#include <com/sun/star/embed/StorageFormats.hpp>
+#include <sal/log.hxx>
+#include <unotools/datetime.hxx>
+#include <comphelper/base64.hxx>
+#include <comphelper/processfactory.hxx>
+#include <comphelper/seqstream.hxx>
+
+namespace com::sun::star::graphic { class XGraphic; }
+
+using namespace css;
+using namespace css::uno;
+using namespace css::beans;
+
+/* protected: for signature verify */
+css::uno::Reference< css::xml::crypto::sax::XReferenceResolvedListener > XSecController::prepareSignatureToRead(
+    sal_Int32 nSecurityId)
+{
+    if ( m_eStatusOfSecurityComponents != InitializationState::INITIALIZED )
+    {
+        return nullptr;
+    }
+
+    sal_Int32 nIdOfSignatureElementCollector;
+    css::uno::Reference< css::xml::crypto::sax::XReferenceResolvedListener > xReferenceResolvedListener;
+
+    nIdOfSignatureElementCollector =
+        m_xSAXEventKeeper->addSecurityElementCollector( css::xml::crypto::sax::ElementMarkPriority_BEFOREMODIFY, false);
+
+    m_xSAXEventKeeper->setSecurityId(nIdOfSignatureElementCollector, nSecurityId);
+
+        /*
+         * create a SignatureVerifier
+         */
+    xReferenceResolvedListener = new SignatureVerifierImpl;
+
+    css::uno::Reference<css::lang::XInitialization> xInitialization(xReferenceResolvedListener, css::uno::UNO_QUERY);
+
+    css::uno::Sequence<css::uno::Any> args(5);
+    args[0] <<= OUString::number(nSecurityId);
+    args[1] <<= uno::Reference<xml::crypto::sax::XSecuritySAXEventKeeper>(static_cast<cppu::OWeakObject*>(m_xSAXEventKeeper.get()), uno::UNO_QUERY);
+    args[2] <<= OUString::number(nIdOfSignatureElementCollector);
+    args[3] <<= m_xSecurityContext;
+    args[4] <<= m_xXMLSignature;
+    xInitialization->initialize(args);
+
+    css::uno::Reference< css::xml::crypto::sax::XSignatureVerifyResultBroadcaster >
+        signatureVerifyResultBroadcaster(xReferenceResolvedListener, css::uno::UNO_QUERY);
+
+    signatureVerifyResultBroadcaster->addSignatureVerifyResultListener( this );
+
+    m_xSAXEventKeeper->addReferenceResolvedListener(
+        nIdOfSignatureElementCollector,
+        xReferenceResolvedListener);
+
+    css::uno::Reference<css::xml::crypto::sax::XKeyCollector> keyCollector (xReferenceResolvedListener, css::uno::UNO_QUERY);
+    keyCollector->setKeyId(0);
+
+    return xReferenceResolvedListener;
+}
+
+void XSecController::addSignature()
+{
+    css::uno::Reference< css::xml::crypto::sax::XReferenceResolvedListener > xReferenceResolvedListener;
+    sal_Int32 nSignatureId = 0;
+
+
+    if (m_bVerifyCurrentSignature)
+    {
+        chainOn();
+        xReferenceResolvedListener = prepareSignatureToRead( m_nReservedSignatureId );
+        m_bVerifyCurrentSignature = false;
+        nSignatureId = m_nReservedSignatureId;
+    }
+
+    InternalSignatureInformation isi( nSignatureId, xReferenceResolvedListener );
+    m_vInternalSignatureInformations.push_back( isi );
+}
+
+void XSecController::setSignatureMethod(svl::crypto::SignatureMethodAlgorithm eAlgorithmID)
+{
+    if (m_vInternalSignatureInformations.empty())
+        return;
+
+    m_vInternalSignatureInformations.back().signatureInfor.eAlgorithmID = eAlgorithmID;
+}
+
+void XSecController::switchGpgSignature()
+{
+#if HAVE_FEATURE_GPGME
+    // swap signature verifier for the Gpg one
+    m_xXMLSignature.set(new XMLSignature_GpgImpl());
+    if (!m_vInternalSignatureInformations.empty())
+    {
+        SignatureVerifierImpl* pImpl=
+            dynamic_cast<SignatureVerifierImpl*>(
+                m_vInternalSignatureInformations.back().xReferenceResolvedListener.get());
+        if (pImpl)
+        {
+            css::uno::Reference<css::xml::crypto::XSEInitializer> xGpgSEInitializer(
+                new SEInitializerGpg());
+            pImpl->updateSignature(new XMLSignature_GpgImpl(),
+                                   xGpgSEInitializer->createSecurityContext(OUString()));
+        }
+    }
+#else
+    (void) this;
+#endif
+}
+
+void XSecController::addReference( const OUString& ouUri, sal_Int32 nDigestID, const OUString& ouType )
+{
+    if (m_vInternalSignatureInformations.empty())
+    {
+        SAL_INFO("xmlsecurity.helper","XSecController::addReference: no signature");
+        return;
+    }
+    InternalSignatureInformation &isi = m_vInternalSignatureInformations.back();
+    isi.addReference(SignatureReferenceType::SAMEDOCUMENT, nDigestID, ouUri, -1, ouType );
+}
+
+void XSecController::addStreamReference(
+    const OUString& ouUri,
+    bool isBinary,
+    sal_Int32 nDigestID )
+{
+    SignatureReferenceType type = (isBinary?SignatureReferenceType::BINARYSTREAM:SignatureReferenceType::XMLSTREAM);
+
+    if (m_vInternalSignatureInformations.empty())
+    {
+        SAL_INFO("xmlsecurity.helper","XSecController::addStreamReference: no signature");
+        return;
+    }
+    InternalSignatureInformation &isi = m_vInternalSignatureInformations.back();
+
+    if ( isi.xReferenceResolvedListener.is() )
+    {
+            /*
+             * get the input stream
+             */
+        css::uno::Reference< css::io::XInputStream > xObjectInputStream
+                = getObjectInputStream( ouUri );
+
+        if ( xObjectInputStream.is() )
+        {
+            css::uno::Reference<css::xml::crypto::XUriBinding> xUriBinding
+                (isi.xReferenceResolvedListener, css::uno::UNO_QUERY);
+            xUriBinding->setUriBinding(ouUri, xObjectInputStream);
+        }
+    }
+
+    isi.addReference(type, nDigestID, ouUri, -1, OUString());
+}
+
+void XSecController::setReferenceCount() const
+{
+    if (m_vInternalSignatureInformations.empty())
+    {
+        SAL_INFO("xmlsecurity.helper","XSecController::setReferenceCount: no signature");
+        return;
+    }
+    const InternalSignatureInformation &isi =
+        m_vInternalSignatureInformations.back();
+
+    if ( isi.xReferenceResolvedListener.is() )
+    {
+        const SignatureReferenceInformations &refInfors = isi.signatureInfor.vSignatureReferenceInfors;
+
+        int refNum = refInfors.size();
+        sal_Int32 referenceCount = 0;
+
+        for(int i=0 ; i<refNum; ++i)
+        {
+            if (refInfors[i].nType == SignatureReferenceType::SAMEDOCUMENT )
+            /*
+             * same-document reference
+             */
+            {
+                referenceCount++;
+            }
+        }
+
+        css::uno::Reference<css::xml::crypto::sax::XReferenceCollector> xReferenceCollector
+            (isi.xReferenceResolvedListener, css::uno::UNO_QUERY);
+        xReferenceCollector->setReferenceCount( referenceCount );
+    }
+}
+
+void XSecController::setX509IssuerName( OUString const & ouX509IssuerName )
+{
+    if (m_vInternalSignatureInformations.empty())
+    {
+        SAL_INFO("xmlsecurity.helper","XSecController::setX509IssuerName: no signature");
+        return;
+    }
+    InternalSignatureInformation &isi = m_vInternalSignatureInformations.back();
+    isi.signatureInfor.ouX509IssuerName = ouX509IssuerName;
+}
+
+void XSecController::setX509SerialNumber( OUString const & ouX509SerialNumber )
+{
+    if (m_vInternalSignatureInformations.empty())
+    {
+        SAL_INFO("xmlsecurity.helper","XSecController::setX509SerialNumber: no signature");
+        return;
+    }
+    InternalSignatureInformation &isi = m_vInternalSignatureInformations.back();
+    isi.signatureInfor.ouX509SerialNumber = ouX509SerialNumber;
+}
+
+void XSecController::setX509Certificate( OUString const & ouX509Certificate )
+{
+    if (m_vInternalSignatureInformations.empty())
+    {
+        SAL_INFO("xmlsecurity.helper","XSecController::setX509Certificate: no signature");
+        return;
+    }
+    InternalSignatureInformation &isi = m_vInternalSignatureInformations.back();
+    isi.signatureInfor.ouX509Certificate = ouX509Certificate;
+}
+
+void XSecController::setSignatureValue( OUString const & ouSignatureValue )
+{
+    if (m_vInternalSignatureInformations.empty())
+    {
+        SAL_INFO("xmlsecurity.helper","XSecController::setSignatureValue: no signature");
+        return;
+    }
+    InternalSignatureInformation &isi = m_vInternalSignatureInformations.back();
+    isi.signatureInfor.ouSignatureValue = ouSignatureValue;
+}
+
+void XSecController::setDigestValue( sal_Int32 nDigestID, OUString const & ouDigestValue )
+{
+    if (m_vInternalSignatureInformations.empty())
+    {
+        SAL_INFO("xmlsecurity.helper","XSecController::setDigestValue: no signature");
+        return;
+    }
+    InternalSignatureInformation &isi = m_vInternalSignatureInformations.back();
+    if (isi.signatureInfor.vSignatureReferenceInfors.empty())
+    {
+        SAL_INFO("xmlsecurity.helper","XSecController::setDigestValue: no signature reference");
+        return;
+    }
+    SignatureReferenceInformation &reference =
+        isi.signatureInfor.vSignatureReferenceInfors.back();
+    reference.nDigestID = nDigestID;
+    reference.ouDigestValue = ouDigestValue;
+}
+
+void XSecController::setGpgKeyID( OUString const & ouKeyID )
+{
+    if (m_vInternalSignatureInformations.empty())
+    {
+        SAL_INFO("xmlsecurity.helper","XSecController::setGpgKeyID: no signature");
+        return;
+    }
+    InternalSignatureInformation &isi = m_vInternalSignatureInformations.back();
+    isi.signatureInfor.ouGpgKeyID = ouKeyID;
+}
+
+void XSecController::setGpgCertificate( OUString const & ouGpgCert )
+{
+    if (m_vInternalSignatureInformations.empty())
+    {
+        SAL_INFO("xmlsecurity.helper","XSecController::setGpgCertificate: no signature");
+        return;
+    }
+    InternalSignatureInformation &isi = m_vInternalSignatureInformations.back();
+    isi.signatureInfor.ouGpgCertificate = ouGpgCert;
+}
+
+void XSecController::setGpgOwner( OUString const & ouGpgOwner )
+{
+    if (m_vInternalSignatureInformations.empty())
+    {
+        SAL_INFO("xmlsecurity.helper","XSecController::setGpgOwner: no signature");
+        return;
+    }
+    InternalSignatureInformation &isi = m_vInternalSignatureInformations.back();
+    isi.signatureInfor.ouGpgOwner = ouGpgOwner;
+}
+
+void XSecController::setDate( OUString const & ouDate )
+{
+    if (m_vInternalSignatureInformations.empty())
+    {
+        SAL_INFO("xmlsecurity.helper","XSecController::setDate: no signature");
+        return;
+    }
+    InternalSignatureInformation &isi = m_vInternalSignatureInformations.back();
+    (void)utl::ISO8601parseDateTime( ouDate, isi.signatureInfor.stDateTime);
+    isi.signatureInfor.ouDateTime = ouDate;
+}
+
+void XSecController::setDescription(const OUString& rDescription)
+{
+    if (m_vInternalSignatureInformations.empty())
+        return;
+
+    InternalSignatureInformation& rInformation = m_vInternalSignatureInformations.back();
+    rInformation.signatureInfor.ouDescription = rDescription;
+}
+
+void XSecController::setSignatureBytes(const uno::Sequence<sal_Int8>& rBytes)
+{
+    if (m_vInternalSignatureInformations.empty())
+        return;
+
+    InternalSignatureInformation& rInformation = m_vInternalSignatureInformations.back();
+    rInformation.signatureInfor.aSignatureBytes = rBytes;
+}
+
+void XSecController::setCertDigest(const OUString& rCertDigest)
+{
+    if (m_vInternalSignatureInformations.empty())
+        return;
+
+    InternalSignatureInformation& rInformation = m_vInternalSignatureInformations.back();
+    rInformation.signatureInfor.ouCertDigest = rCertDigest;
+}
+
+namespace {
+Reference<css::graphic::XGraphic> lcl_getGraphicFromString(const OUString& rImage)
+{
+    Sequence<sal_Int8> seq;
+    comphelper::Base64::decode(seq, rImage);
+
+    Reference< graphic::XGraphic > xGraphic;
+    if( !seq.hasElements() )
+        return Reference<css::graphic::XGraphic>();
+
+    Reference< graphic::XGraphicProvider > xGraphicProvider(
+        graphic::GraphicProvider::create(comphelper::getProcessComponentContext()) );
+    Reference< io::XInputStream > xInputStream( new ::comphelper::SequenceInputStream( seq ) );
+
+    Sequence< PropertyValue > aArgs( 1 );
+    aArgs[ 0 ].Name = "InputStream";
+    aArgs[ 0 ].Value <<= xInputStream;
+    xGraphic = xGraphicProvider->queryGraphic(aArgs);
+
+    return xGraphic;
+}
+}
+
+void XSecController::setValidSignatureImage(const OUString& rValidSigImg)
+{
+    if (m_vInternalSignatureInformations.empty() || rValidSigImg.isEmpty())
+        return;
+
+    InternalSignatureInformation& rInformation = m_vInternalSignatureInformations.back();
+    rInformation.signatureInfor.aValidSignatureImage = lcl_getGraphicFromString(rValidSigImg);
+}
+
+void XSecController::setInvalidSignatureImage(const OUString& rInvalidSigImg)
+{
+    if (m_vInternalSignatureInformations.empty() || rInvalidSigImg.isEmpty())
+        return;
+
+    InternalSignatureInformation& rInformation = m_vInternalSignatureInformations.back();
+    rInformation.signatureInfor.aInvalidSignatureImage = lcl_getGraphicFromString(rInvalidSigImg);
+}
+
+void XSecController::setSignatureLineId(const OUString& rSignatureLineId)
+{
+    if (m_vInternalSignatureInformations.empty())
+        return;
+
+    InternalSignatureInformation& rInformation = m_vInternalSignatureInformations.back();
+    rInformation.signatureInfor.ouSignatureLineId = rSignatureLineId;
+}
+
+void XSecController::addEncapsulatedX509Certificate(const OUString& rEncapsulatedX509Certificate)
+{
+    if (m_vInternalSignatureInformations.empty())
+        return;
+
+    if (rEncapsulatedX509Certificate.isEmpty())
+        return;
+
+    InternalSignatureInformation& rInformation = m_vInternalSignatureInformations.back();
+    rInformation.signatureInfor.maEncapsulatedX509Certificates.insert(rEncapsulatedX509Certificate);
+}
+
+void XSecController::setId( OUString const & ouId )
+{
+    if (m_vInternalSignatureInformations.empty())
+    {
+        SAL_INFO("xmlsecurity.helper","XSecController::setId: no signature");
+        return;
+    }
+    InternalSignatureInformation &isi = m_vInternalSignatureInformations.back();
+    isi.signatureInfor.ouSignatureId = ouId;
+}
+
+void XSecController::setPropertyId( OUString const & ouPropertyId )
+{
+    if (m_vInternalSignatureInformations.empty())
+    {
+        SAL_INFO("xmlsecurity.helper","XSecController::setPropertyId: no signature");
+        return;
+    }
+    InternalSignatureInformation &isi = m_vInternalSignatureInformations.back();
+
+    if (isi.signatureInfor.ouPropertyId.isEmpty())
+    {
+        // <SignatureProperty> ID attribute is for the date.
+        isi.signatureInfor.ouPropertyId = ouPropertyId;
+    }
+    else
+    {
+        // <SignatureProperty> ID attribute is for the description.
+        isi.signatureInfor.ouDescriptionPropertyId = ouPropertyId;
+    }
+}
+
+/* public: for signature verify */
+void XSecController::collectToVerify( const OUString& referenceId )
+{
+    /* SAL_WARN_IF( !m_xSAXEventKeeper.is(), "xmlsecurity", "the SAXEventKeeper is NULL" ); */
+
+    if ( m_eStatusOfSecurityComponents == InitializationState::INITIALIZED )
+    /*
+     * if all security components are ready, verify the signature.
+     */
+    {
+        bool bJustChainingOn = false;
+        css::uno::Reference< css::xml::sax::XDocumentHandler > xHandler;
+
+        int i,j;
+        int sigNum = m_vInternalSignatureInformations.size();
+
+        for (i=0; i<sigNum; ++i)
+        {
+            InternalSignatureInformation& isi = m_vInternalSignatureInformations[i];
+            SignatureReferenceInformations& vReferenceInfors = isi.signatureInfor.vSignatureReferenceInfors;
+            int refNum = vReferenceInfors.size();
+
+            for (j=0; j<refNum; ++j)
+            {
+                SignatureReferenceInformation &refInfor = vReferenceInfors[j];
+
+                if (refInfor.ouURI == referenceId)
+                {
+                    if (chainOn())
+                    {
+                        bJustChainingOn = true;
+                        xHandler = m_xSAXEventKeeper->setNextHandler(nullptr);
+                    }
+
+                    sal_Int32 nKeeperId = m_xSAXEventKeeper->addSecurityElementCollector(
+                        css::xml::crypto::sax::ElementMarkPriority_BEFOREMODIFY, false );
+
+                    css::uno::Reference<css::xml::crypto::sax::XReferenceCollector> xReferenceCollector
+                        ( isi.xReferenceResolvedListener, css::uno::UNO_QUERY );
+
+                    m_xSAXEventKeeper->setSecurityId(nKeeperId, isi.signatureInfor.nSecurityId);
+                    m_xSAXEventKeeper->addReferenceResolvedListener( nKeeperId, isi.xReferenceResolvedListener);
+                    xReferenceCollector->setReferenceId( nKeeperId );
+
+                    isi.vKeeperIds[j] = nKeeperId;
+                    break;
+                }
+            }
+        }
+
+        if ( bJustChainingOn )
+        {
+            m_xSAXEventKeeper->setNextHandler(xHandler);
+        }
+    }
+}
+
+void XSecController::addSignature( sal_Int32 nSignatureId )
+{
+    SAL_WARN_IF( !m_xSecParser.is(), "xmlsecurity.helper", "No XSecParser initialized" );
+
+    m_nReservedSignatureId = nSignatureId;
+    m_bVerifyCurrentSignature = true;
+}
+
+css::uno::Reference< css::xml::sax::XDocumentHandler > const & XSecController::createSignatureReader(XMLSignatureHelper& rXMLSignatureHelper, sal_Int32 nType)
+{
+    if (nType == embed::StorageFormats::OFOPXML)
+        m_xSecParser = new OOXMLSecParser(rXMLSignatureHelper, this);
+    else
+        m_xSecParser = new XSecParser(rXMLSignatureHelper, this);
+    css::uno::Reference< css::lang::XInitialization > xInitialization(m_xSecParser, uno::UNO_QUERY);
+
+    setSAXChainConnector(xInitialization);
+
+    return m_xSecParser;
+}
+
+void XSecController::releaseSignatureReader()
+{
+    clearSAXChainConnector( );
+    m_xSecParser.clear();
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/pdfio/pdfdocument.cxx b/xmlsecurity/source/pdfio/pdfdocument.cxx
new file mode 100644
index 000000000..8c8421f6a
--- /dev/null
+++ b/xmlsecurity/source/pdfio/pdfdocument.cxx
@@ -0,0 +1,393 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#include <pdfio/pdfdocument.hxx>
+
+#include <memory>
+#include <vector>
+
+#include <config_features.h>
+
+#include <vcl/filter/PDFiumLibrary.hxx>
+#include <rtl/string.hxx>
+#include <rtl/ustrbuf.hxx>
+#include <sal/log.hxx>
+#include <sal/types.h>
+
+#include <svl/sigstruct.hxx>
+#include <svl/cryptosign.hxx>
+#include <vcl/filter/pdfdocument.hxx>
+#include <vcl/bitmap.hxx>
+#include <basegfx/range/b2drectangle.hxx>
+
+#if HAVE_FEATURE_PDFIUM
+#include <fpdf_annot.h>
+#endif
+
+using namespace com::sun::star;
+
+namespace
+{
+/// Turns an array of floats into offset + length pairs.
+bool GetByteRangesFromPDF(vcl::filter::PDFArrayElement& rArray,
+                          std::vector<std::pair<size_t, size_t>>& rByteRanges)
+{
+    size_t nByteRangeOffset = 0;
+    const std::vector<vcl::filter::PDFElement*>& rByteRangeElements = rArray.GetElements();
+    for (size_t i = 0; i < rByteRangeElements.size(); ++i)
+    {
+        auto pNumber = dynamic_cast<vcl::filter::PDFNumberElement*>(rByteRangeElements[i]);
+        if (!pNumber)
+        {
+            SAL_WARN("xmlsecurity.pdfio",
+                     "ValidateSignature: signature offset and length has to be a number");
+            return false;
+        }
+
+        if (i % 2 == 0)
+        {
+            nByteRangeOffset = pNumber->GetValue();
+            continue;
+        }
+        size_t nByteRangeLength = pNumber->GetValue();
+        rByteRanges.emplace_back(nByteRangeOffset, nByteRangeLength);
+    }
+
+    return true;
+}
+
+/// Determines the last position that is covered by a signature.
+bool GetEOFOfSignature(vcl::filter::PDFObjectElement* pSignature, size_t& rEOF)
+{
+    vcl::filter::PDFObjectElement* pValue = pSignature->LookupObject("V");
+    if (!pValue)
+    {
+        return false;
+    }
+
+    auto pByteRange = dynamic_cast<vcl::filter::PDFArrayElement*>(pValue->Lookup("ByteRange"));
+    if (!pByteRange || pByteRange->GetElements().size() < 2)
+    {
+        return false;
+    }
+
+    std::vector<std::pair<size_t, size_t>> aByteRanges;
+    if (!GetByteRangesFromPDF(*pByteRange, aByteRanges))
+    {
+        return false;
+    }
+
+    rEOF = aByteRanges[1].first + aByteRanges[1].second;
+    return true;
+}
+
+/// Checks if there are unsigned incremental updates between the signatures or after the last one.
+bool IsCompleteSignature(SvStream& rStream, vcl::filter::PDFDocument& rDocument,
+                         vcl::filter::PDFObjectElement* pSignature)
+{
+    std::set<size_t> aSignedEOFs;
+    for (const auto& i : rDocument.GetSignatureWidgets())
+    {
+        size_t nEOF = 0;
+        if (!GetEOFOfSignature(i, nEOF))
+        {
+            return false;
+        }
+
+        aSignedEOFs.insert(nEOF);
+    }
+
+    size_t nSignatureEOF = 0;
+    if (!GetEOFOfSignature(pSignature, nSignatureEOF))
+    {
+        return false;
+    }
+
+    const std::vector<size_t>& rAllEOFs = rDocument.GetEOFs();
+    bool bFoundOwn = false;
+    for (const auto& rEOF : rAllEOFs)
+    {
+        if (rEOF == nSignatureEOF)
+        {
+            bFoundOwn = true;
+            continue;
+        }
+
+        if (!bFoundOwn)
+        {
+            continue;
+        }
+
+        if (aSignedEOFs.find(rEOF) == aSignedEOFs.end())
+        {
+            // Unsigned incremental update found.
+            return false;
+        }
+    }
+
+    // Make sure we find the incremental update of the signature itself.
+    if (!bFoundOwn)
+    {
+        return false;
+    }
+
+    // No additional content after the last incremental update.
+    rStream.Seek(STREAM_SEEK_TO_END);
+    size_t nFileEnd = rStream.Tell();
+    return std::find(rAllEOFs.begin(), rAllEOFs.end(), nFileEnd) != rAllEOFs.end();
+}
+
+#if HAVE_FEATURE_PDFIUM
+
+/**
+ * Contains checksums of a PDF page, which is rendered without annotations. It also contains
+ * the geometry of a few dangerous annotation types.
+ */
+struct PageChecksum
+{
+    BitmapChecksum m_nPageContent;
+    std::vector<basegfx::B2DRectangle> m_aAnnotations;
+    bool operator==(const PageChecksum& rChecksum) const;
+};
+
+bool PageChecksum::operator==(const PageChecksum& rChecksum) const
+{
+    if (m_nPageContent != rChecksum.m_nPageContent)
+    {
+        return false;
+    }
+
+    return m_aAnnotations == rChecksum.m_aAnnotations;
+}
+
+/// Collects the checksum of each page of one version of the PDF.
+void AnalyizeSignatureStream(SvMemoryStream& rStream, std::vector<PageChecksum>& rPageChecksums,
+                             int nMDPPerm)
+{
+    auto pPdfium = vcl::pdf::PDFiumLibrary::get();
+    vcl::pdf::PDFiumDocument aPdfDocument(
+        FPDF_LoadMemDocument(rStream.GetData(), rStream.GetSize(), /*password=*/nullptr));
+
+    int nPageCount = aPdfDocument.getPageCount();
+    for (int nPage = 0; nPage < nPageCount; ++nPage)
+    {
+        std::unique_ptr<vcl::pdf::PDFiumPage> pPdfPage(aPdfDocument.openPage(nPage));
+        if (!pPdfPage)
+        {
+            return;
+        }
+
+        PageChecksum aPageChecksum;
+        aPageChecksum.m_nPageContent = pPdfPage->getChecksum(nMDPPerm);
+        for (int i = 0; i < FPDFPage_GetAnnotCount(pPdfPage->getPointer()); ++i)
+        {
+            FPDF_ANNOTATION pAnnotation = FPDFPage_GetAnnot(pPdfPage->getPointer(), i);
+            int nType = FPDFAnnot_GetSubtype(pAnnotation);
+            switch (nType)
+            {
+                case FPDF_ANNOT_UNKNOWN:
+                case FPDF_ANNOT_FREETEXT:
+                case FPDF_ANNOT_STAMP:
+                case FPDF_ANNOT_REDACT:
+                {
+                    basegfx::B2DRectangle aB2DRectangle;
+                    FS_RECTF aRect;
+                    if (FPDFAnnot_GetRect(pAnnotation, &aRect))
+                    {
+                        aB2DRectangle = basegfx::B2DRectangle(aRect.left, aRect.top, aRect.right,
+                                                              aRect.bottom);
+                    }
+                    aPageChecksum.m_aAnnotations.push_back(aB2DRectangle);
+                    break;
+                }
+                default:
+                    break;
+            }
+            FPDFPage_CloseAnnot(pAnnotation);
+        }
+        rPageChecksums.push_back(aPageChecksum);
+    }
+}
+#endif
+
+/**
+ * Checks if incremental updates after singing performed valid modifications only.
+ * nMDPPerm decides if annotations/commenting is OK, other changes are always not.
+ */
+bool IsValidSignature(SvStream& rStream, vcl::filter::PDFObjectElement* pSignature, int nMDPPerm)
+{
+    size_t nSignatureEOF = 0;
+    if (!GetEOFOfSignature(pSignature, nSignatureEOF))
+    {
+        return false;
+    }
+
+#if HAVE_FEATURE_PDFIUM
+    SvMemoryStream aSignatureStream;
+    sal_uInt64 nPos = rStream.Tell();
+    rStream.Seek(0);
+    aSignatureStream.WriteStream(rStream, nSignatureEOF);
+    rStream.Seek(nPos);
+    aSignatureStream.Seek(0);
+    std::vector<PageChecksum> aSignedPages;
+    AnalyizeSignatureStream(aSignatureStream, aSignedPages, nMDPPerm);
+
+    SvMemoryStream aFullStream;
+    nPos = rStream.Tell();
+    rStream.Seek(0);
+    aFullStream.WriteStream(rStream);
+    rStream.Seek(nPos);
+    aFullStream.Seek(0);
+    std::vector<PageChecksum> aAllPages;
+    AnalyizeSignatureStream(aFullStream, aAllPages, nMDPPerm);
+
+    // Fail if any page looks different after signing and at the end. Annotations/commenting doesn't
+    // count, though.
+    return aSignedPages == aAllPages;
+#else
+    (void)rStream;
+    (void)nMDPPerm;
+    return true;
+#endif
+}
+}
+
+namespace xmlsecurity::pdfio
+{
+bool ValidateSignature(SvStream& rStream, vcl::filter::PDFObjectElement* pSignature,
+                       SignatureInformation& rInformation, vcl::filter::PDFDocument& rDocument,
+                       int nMDPPerm)
+{
+    vcl::filter::PDFObjectElement* pValue = pSignature->LookupObject("V");
+    if (!pValue)
+    {
+        SAL_WARN("xmlsecurity.pdfio", "ValidateSignature: no value");
+        return false;
+    }
+
+    auto pContents = dynamic_cast<vcl::filter::PDFHexStringElement*>(pValue->Lookup("Contents"));
+    if (!pContents)
+    {
+        SAL_WARN("xmlsecurity.pdfio", "ValidateSignature: no contents");
+        return false;
+    }
+
+    auto pByteRange = dynamic_cast<vcl::filter::PDFArrayElement*>(pValue->Lookup("ByteRange"));
+    if (!pByteRange || pByteRange->GetElements().size() < 2)
+    {
+        SAL_WARN("xmlsecurity.pdfio", "ValidateSignature: no byte range or too few elements");
+        return false;
+    }
+
+    auto pSubFilter = dynamic_cast<vcl::filter::PDFNameElement*>(pValue->Lookup("SubFilter"));
+    const bool bNonDetached = pSubFilter && pSubFilter->GetValue() == "adbe.pkcs7.sha1";
+    if (!pSubFilter
+        || (pSubFilter->GetValue() != "adbe.pkcs7.detached" && !bNonDetached
+            && pSubFilter->GetValue() != "ETSI.CAdES.detached"))
+    {
+        if (!pSubFilter)
+            SAL_WARN("xmlsecurity.pdfio", "ValidateSignature: missing sub-filter");
+        else
+            SAL_WARN("xmlsecurity.pdfio", "ValidateSignature: unsupported sub-filter: '"
+                                              << pSubFilter->GetValue() << "'");
+        return false;
+    }
+
+    // Reason / comment / description is optional.
+    auto pReason = dynamic_cast<vcl::filter::PDFHexStringElement*>(pValue->Lookup("Reason"));
+    if (pReason)
+    {
+        // See appendUnicodeTextString() for the export equivalent of this.
+        std::vector<unsigned char> aReason = vcl::filter::PDFDocument::DecodeHexString(pReason);
+        OUStringBuffer aBuffer;
+        sal_uInt16 nByte = 0;
+        for (size_t i = 0; i < aReason.size(); ++i)
+        {
+            if (i % 2 == 0)
+                nByte = aReason[i];
+            else
+            {
+                sal_Unicode nUnicode;
+                nUnicode = (nByte << 8);
+                nUnicode |= aReason[i];
+                aBuffer.append(nUnicode);
+            }
+        }
+
+        if (!aBuffer.isEmpty())
+            rInformation.ouDescription = aBuffer.makeStringAndClear();
+    }
+
+    // Date: used only when the time of signing is not available in the
+    // signature.
+    auto pM = dynamic_cast<vcl::filter::PDFLiteralStringElement*>(pValue->Lookup("M"));
+    if (pM)
+    {
+        // Example: "D:20161027100104".
+        const OString& rM = pM->GetValue();
+        if (rM.startsWith("D:") && rM.getLength() >= 16)
+        {
+            rInformation.stDateTime.Year = rM.copy(2, 4).toInt32();
+            rInformation.stDateTime.Month = rM.copy(6, 2).toInt32();
+            rInformation.stDateTime.Day = rM.copy(8, 2).toInt32();
+            rInformation.stDateTime.Hours = rM.copy(10, 2).toInt32();
+            rInformation.stDateTime.Minutes = rM.copy(12, 2).toInt32();
+            rInformation.stDateTime.Seconds = rM.copy(14, 2).toInt32();
+        }
+    }
+
+    // Build a list of offset-length pairs, representing the signed bytes.
+    std::vector<std::pair<size_t, size_t>> aByteRanges;
+    if (!GetByteRangesFromPDF(*pByteRange, aByteRanges))
+    {
+        return false;
+    }
+
+    // Detect if the byte ranges don't cover everything, but the signature itself.
+    if (aByteRanges.size() < 2)
+    {
+        SAL_WARN("xmlsecurity.pdfio", "ValidateSignature: expected 2 byte ranges");
+        return false;
+    }
+    if (aByteRanges[0].first != 0)
+    {
+        SAL_WARN("xmlsecurity.pdfio", "ValidateSignature: first range start is not 0");
+        return false;
+    }
+    // 2 is the leading "<" and the trailing ">" around the hex string.
+    size_t nSignatureLength = static_cast<size_t>(pContents->GetValue().getLength()) + 2;
+    if (aByteRanges[1].first != (aByteRanges[0].second + nSignatureLength))
+    {
+        SAL_WARN("xmlsecurity.pdfio",
+                 "ValidateSignature: second range start is not the end of the signature");
+        return false;
+    }
+    rInformation.bPartialDocumentSignature = !IsCompleteSignature(rStream, rDocument, pSignature);
+    if (!IsValidSignature(rStream, pSignature, nMDPPerm))
+    {
+        SAL_WARN("xmlsecurity.pdfio", "ValidateSignature: invalid incremental update detected");
+        return false;
+    }
+
+    // At this point there is no obviously missing info to validate the
+    // signature.
+    std::vector<unsigned char> aSignature = vcl::filter::PDFDocument::DecodeHexString(pContents);
+    if (aSignature.empty())
+    {
+        SAL_WARN("xmlsecurity.pdfio", "ValidateSignature: empty contents");
+        return false;
+    }
+
+    return svl::crypto::Signing::Verify(rStream, aByteRanges, bNonDetached, aSignature,
+                                        rInformation);
+}
+
+} // namespace xmlsecurity::pdfio
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/xmlsec/biginteger.cxx b/xmlsecurity/source/xmlsec/biginteger.cxx
new file mode 100644
index 000000000..0bfcbd326
--- /dev/null
+++ b/xmlsecurity/source/xmlsec/biginteger.cxx
@@ -0,0 +1,108 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+
+#include <biginteger.hxx>
+
+#include <xmlsec-wrapper.h>
+#include <com/sun/star/uno/Sequence.hxx>
+
+using namespace ::com::sun::star::uno ;
+
+namespace xmlsecurity
+{
+Sequence< sal_Int8 > numericStringToBigInteger ( const OUString& numeral )
+{
+    xmlChar* chNumeral ;
+    const xmlSecByte* bnInteger ;
+    xmlSecSize length ;
+    xmlSecBn bn ;
+
+    OString onumeral = OUStringToOString( numeral , RTL_TEXTENCODING_ASCII_US ) ;
+
+    chNumeral = xmlStrndup( reinterpret_cast<const xmlChar*>(onumeral.getStr()), static_cast<int>(onumeral.getLength()) ) ;
+
+    if( xmlSecBnInitialize( &bn, 0 ) < 0 ) {
+        xmlFree( chNumeral ) ;
+        return Sequence< sal_Int8 >();
+    }
+
+    if( xmlSecBnFromDecString( &bn, chNumeral ) < 0 ) {
+        xmlFree( chNumeral ) ;
+        xmlSecBnFinalize( &bn ) ;
+        return Sequence< sal_Int8 >();
+    }
+
+    xmlFree( chNumeral ) ;
+
+    length = xmlSecBnGetSize( &bn ) ;
+    if( length <= 0 ) {
+        xmlSecBnFinalize( &bn ) ;
+        return Sequence< sal_Int8 >();
+    }
+
+    bnInteger = xmlSecBnGetData( &bn ) ;
+    if( bnInteger == nullptr ) {
+        xmlSecBnFinalize( &bn ) ;
+        return Sequence< sal_Int8 >();
+    }
+
+    Sequence< sal_Int8 > integer( length ) ;
+    for( xmlSecSize i = 0 ; i < length ; i ++ )
+    {
+        integer[i] = *( bnInteger + i ) ;
+    }
+
+    xmlSecBnFinalize( &bn ) ;
+    return integer ;
+}
+
+OUString bigIntegerToNumericString ( const Sequence< sal_Int8 >& integer )
+{
+    OUString aRet ;
+
+    if( integer.hasElements() ) {
+        xmlSecBn bn ;
+        xmlChar* chNumeral ;
+
+        if( xmlSecBnInitialize( &bn, 0 ) < 0 )
+            return aRet ;
+
+        if( xmlSecBnSetData( &bn, reinterpret_cast<const unsigned char*>(integer.getConstArray()), integer.getLength() ) < 0 ) {
+            xmlSecBnFinalize( &bn ) ;
+            return aRet ;
+        }
+
+        chNumeral = xmlSecBnToDecString( &bn ) ;
+        if( chNumeral == nullptr ) {
+            xmlSecBnFinalize( &bn ) ;
+            return aRet ;
+        }
+
+        aRet = OUString::createFromAscii( reinterpret_cast<char*>(chNumeral) ) ;
+
+        xmlSecBnFinalize( &bn ) ;
+        xmlFree( chNumeral ) ;
+    }
+
+    return aRet ;
+}
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/xmlsec/certificateextension_certextn.cxx b/xmlsecurity/source/xmlsec/certificateextension_certextn.cxx
new file mode 100644
index 000000000..b7b5f1e9d
--- /dev/null
+++ b/xmlsecurity/source/xmlsec/certificateextension_certextn.cxx
@@ -0,0 +1,54 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include "certificateextension_certextn.hxx"
+
+CertificateExtension_CertExtn::CertificateExtension_CertExtn()
+    : m_critical(false)
+{
+}
+
+void CertificateExtension_CertExtn::setCertExtn(const unsigned char* value, unsigned int vlen,
+                                                const unsigned char* id, unsigned int idlen, bool critical)
+{
+    unsigned int i ;
+    if( value != nullptr && vlen != 0 ) {
+        css::uno::Sequence< sal_Int8 > extnv( vlen ) ;
+        for( i = 0; i < vlen ; i ++ )
+            extnv[i] = *( value + i ) ;
+
+        m_xExtnValue = extnv ;
+    } else {
+        m_xExtnValue = css::uno::Sequence<sal_Int8>();
+    }
+
+    if( id != nullptr && idlen != 0 ) {
+        css::uno::Sequence< sal_Int8 > extnId( idlen ) ;
+        for( i = 0; i < idlen ; i ++ )
+            extnId[i] = *( id + i ) ;
+
+        m_xExtnId = extnId ;
+    } else {
+        m_xExtnId = css::uno::Sequence<sal_Int8>();
+    }
+
+    m_critical = critical ;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/xmlsec/certificateextension_certextn.hxx b/xmlsecurity/source/xmlsec/certificateextension_certextn.hxx
new file mode 100644
index 000000000..bb1ca1439
--- /dev/null
+++ b/xmlsecurity/source/xmlsec/certificateextension_certextn.hxx
@@ -0,0 +1,38 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#ifndef INCLUDED_XMLSECURITY_SOURCE_XMLSEC_CERTIFICATEEXTENSION_CERTEXTN_HXX
+#define INCLUDED_XMLSECURITY_SOURCE_XMLSEC_CERTIFICATEEXTENSION_CERTEXTN_HXX
+
+#include <sal/config.h>
+#include <com/sun/star/uno/Sequence.hxx>
+
+struct CertificateExtension_CertExtn
+{
+    bool m_critical;
+    css::uno::Sequence< sal_Int8 > m_xExtnId;
+    css::uno::Sequence< sal_Int8 > m_xExtnValue;
+
+    CertificateExtension_CertExtn();
+    void setCertExtn(unsigned char const * value, unsigned int vlen, unsigned char const * id, unsigned int idlen, bool critical);
+};
+
+#endif // INCLUDED_XMLSECURITY_SOURCE_XMLSEC_CERTIFICATEEXTENSION_CERTEXTN_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/xmlsec/certificateextension_xmlsecimpl.hxx b/xmlsecurity/source/xmlsec/certificateextension_xmlsecimpl.hxx
new file mode 100644
index 000000000..11e9a0470
--- /dev/null
+++ b/xmlsecurity/source/xmlsec/certificateextension_xmlsecimpl.hxx
@@ -0,0 +1,59 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#ifndef INCLUDED_XMLSECURITY_SOURCE_XMLSEC_CERTIFICATEEXTENSION_XMLSECIMPL_HXX
+#define INCLUDED_XMLSECURITY_SOURCE_XMLSEC_CERTIFICATEEXTENSION_XMLSECIMPL_HXX
+
+#include <sal/config.h>
+#include <cppuhelper/implbase.hxx>
+#include <com/sun/star/security/XCertificateExtension.hpp>
+#include "certificateextension_certextn.hxx"
+
+class CertificateExtension_XmlSecImpl : public ::cppu::WeakImplHelper<
+    css::security::XCertificateExtension >
+{
+    private:
+        CertificateExtension_CertExtn m_Extn;
+
+    public:
+        //Methods from XCertificateExtension
+        virtual sal_Bool SAL_CALL isCritical() override
+        {
+            return m_Extn.m_critical;
+        }
+
+        virtual css::uno::Sequence< sal_Int8 > SAL_CALL getExtensionId() override
+        {
+            return m_Extn.m_xExtnId;
+        }
+
+        virtual css::uno::Sequence< sal_Int8 > SAL_CALL getExtensionValue() override
+        {
+            return m_Extn.m_xExtnValue;
+        }
+
+        void setCertExtn(unsigned char const * value, unsigned int vlen, unsigned char const * id, unsigned int idlen, bool critical)
+        {
+            m_Extn.setCertExtn(value, vlen, id, idlen, critical);
+        }
+};
+
+#endif // INCLUDED_XMLSECURITY_SOURCE_XMLSEC_CERTIFICATEEXTENSION_XMLSECIMPL_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/xmlsec/errorcallback.cxx b/xmlsecurity/source/xmlsec/errorcallback.cxx
new file mode 100644
index 000000000..a535ffa77
--- /dev/null
+++ b/xmlsecurity/source/xmlsec/errorcallback.cxx
@@ -0,0 +1,68 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <sal/config.h>
+#include <xmlsec-wrapper.h>
+
+#include <xmlsec/errorcallback.hxx>
+
+#include <rtl/ustring.hxx>
+#include <sal/log.hxx>
+
+#ifdef _WIN32
+#include <prewin.h>
+#include <postwin.h>
+#include <comphelper/windowserrorstring.hxx>
+#endif
+
+extern "C" {
+
+static void errorCallback(const char* file,
+                   int line,
+                   const char* func,
+                   const char* errorObject,
+                   const char* errorSubject,
+                   int reason,
+                   const char* msg)
+{
+    const char* pErrorObject = errorObject ? errorObject : "";
+    const char* pErrorSubject = errorSubject ? errorSubject : "";
+    const char* pMsg = msg ? msg : "";
+    OUString systemErrorString;
+
+#ifdef _WIN32
+    systemErrorString = " " + WindowsErrorString(GetLastError());
+#endif
+
+    SAL_WARN("xmlsecurity.xmlsec", file << ":" << line << ": " << func << "() '" << pErrorObject << "' '" << pErrorSubject << "' " << reason << " '" << pMsg << "'" << systemErrorString);
+}
+
+}
+
+void setErrorRecorder()
+{
+    xmlSecErrorsSetCallback(errorCallback);
+}
+
+void clearErrorRecorder()
+{
+    xmlSecErrorsSetCallback(nullptr);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/xmlsec/mscrypt/akmngr.cxx b/xmlsecurity/source/xmlsec/mscrypt/akmngr.cxx
new file mode 100644
index 000000000..ec3cecd4a
--- /dev/null
+++ b/xmlsecurity/source/xmlsec/mscrypt/akmngr.cxx
@@ -0,0 +1,229 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <sal/config.h>
+#include <xmlsec-wrapper.h>
+
+#include "akmngr.hxx"
+
+#include <xmlsec/xmlsec.h>
+#include <xmlsec/keys.h>
+#include <xmlsec/keysmngr.h>
+#include <xmlsec/transforms.h>
+#include <xmlsec/errors.h>
+
+#include <xmlsec/mscng/crypto.h>
+#include <xmlsec/mscng/keysstore.h>
+#include <xmlsec/mscng/x509.h>
+#include <svl/cryptosign.hxx>
+
+namespace xmlsecurity
+{
+
+/**
+ * MSCryptoAppliedKeysMngrCreate:
+ *
+ * Create and load key store and certificate database into keys manager
+ *
+ * Returns keys manager pointer on success or NULL otherwise.
+ */
+xmlSecKeysMngrPtr MSCryptoAppliedKeysMngrCreate()
+{
+    xmlSecKeysMngrPtr        keyMngr = nullptr ;
+    xmlSecKeyStorePtr        keyStore = nullptr ;
+
+    keyStore = xmlSecKeyStoreCreate(xmlSecMSCngKeysStoreId);
+    if (keyStore == nullptr)
+    {
+        xmlSecError(XMLSEC_ERRORS_HERE,
+                    nullptr,
+                    "xmlSecKeyStoreCreate",
+                    XMLSEC_ERRORS_R_XMLSEC_FAILED,
+                    XMLSEC_ERRORS_NO_MESSAGE) ;
+        return nullptr ;
+    }
+
+    keyMngr = xmlSecKeysMngrCreate() ;
+    if (keyMngr == nullptr)
+    {
+        xmlSecError(XMLSEC_ERRORS_HERE,
+                    nullptr,
+                    "xmlSecKeysMngrCreate",
+                    XMLSEC_ERRORS_R_XMLSEC_FAILED,
+                    XMLSEC_ERRORS_NO_MESSAGE) ;
+
+        xmlSecKeyStoreDestroy(keyStore) ;
+        return nullptr ;
+    }
+
+    /*-
+     * Add key store to manager, from now on keys manager destroys the store if
+     * needed
+     */
+    if (xmlSecKeysMngrAdoptKeysStore(keyMngr, keyStore) < 0)
+    {
+        xmlSecError(XMLSEC_ERRORS_HERE,
+                    xmlSecErrorsSafeString(xmlSecKeyStoreGetName(keyStore)),
+                    "xmlSecKeysMngrAdoptKeyStore",
+                    XMLSEC_ERRORS_R_XMLSEC_FAILED,
+                    XMLSEC_ERRORS_NO_MESSAGE) ;
+
+        xmlSecKeyStoreDestroy(keyStore) ;
+        xmlSecKeysMngrDestroy(keyMngr) ;
+        return nullptr ;
+    }
+
+    /*-
+     * Initialize crypto library specific data in keys manager
+     */
+    if (xmlSecMSCngKeysMngrInit(keyMngr) < 0)
+    {
+        xmlSecError(XMLSEC_ERRORS_HERE,
+                    nullptr,
+                    "xmlSecMSCngKeysMngrInit",
+                    XMLSEC_ERRORS_R_XMLSEC_FAILED,
+                    XMLSEC_ERRORS_NO_MESSAGE);
+
+        xmlSecKeysMngrDestroy(keyMngr);
+        return nullptr;
+    }
+
+    /*-
+     * Set certificate database to X509 key data store
+     */
+    /*-
+     * At present, MS Crypto engine do not provide a way to setup a cert store.
+     */
+
+    /*-
+     * Set the getKey callback
+     */
+    keyMngr->getKey = xmlSecKeysMngrGetKey ;
+
+    return keyMngr ;
+}
+
+int
+MSCryptoAppliedKeysMngrAdoptKeyStore(
+    xmlSecKeysMngrPtr    mngr,
+    HCERTSTORE keyStore
+)
+{
+    xmlSecKeyDataStorePtr x509Store ;
+
+    xmlSecAssert2(mngr != nullptr, -1) ;
+    xmlSecAssert2(keyStore != nullptr, -1) ;
+
+    x509Store = xmlSecKeysMngrGetDataStore(mngr, xmlSecMSCngX509StoreId);
+    if (x509Store == nullptr)
+    {
+        xmlSecError(XMLSEC_ERRORS_HERE,
+                    nullptr,
+                    "xmlSecKeysMngrGetDataStore",
+                    XMLSEC_ERRORS_R_XMLSEC_FAILED,
+                    XMLSEC_ERRORS_NO_MESSAGE) ;
+        return -1 ;
+    }
+
+    if (xmlSecMSCngX509StoreAdoptKeyStore(x509Store, keyStore) < 0)
+    {
+        xmlSecError(XMLSEC_ERRORS_HERE,
+                    xmlSecErrorsSafeString(xmlSecKeyDataStoreGetName(x509Store)),
+                    "xmlSecMSCngX509StoreAdoptKeyStore",
+                    XMLSEC_ERRORS_R_XMLSEC_FAILED,
+                    XMLSEC_ERRORS_NO_MESSAGE);
+        return -1;
+    }
+
+    return 0 ;
+}
+
+int
+MSCryptoAppliedKeysMngrAdoptTrustedStore(
+    xmlSecKeysMngrPtr    mngr,
+    HCERTSTORE trustedStore
+)
+{
+    xmlSecKeyDataStorePtr x509Store ;
+
+    xmlSecAssert2(mngr != nullptr, -1) ;
+    xmlSecAssert2(trustedStore != nullptr, -1) ;
+
+    x509Store = xmlSecKeysMngrGetDataStore(mngr, xmlSecMSCngX509StoreId);
+    if (x509Store == nullptr)
+    {
+        xmlSecError(XMLSEC_ERRORS_HERE,
+                    nullptr,
+                    "xmlSecKeysMngrGetDataStore",
+                    XMLSEC_ERRORS_R_XMLSEC_FAILED,
+                    XMLSEC_ERRORS_NO_MESSAGE) ;
+        return -1 ;
+    }
+
+    if (xmlSecMSCngX509StoreAdoptTrustedStore(x509Store, trustedStore) < 0)
+    {
+        xmlSecError(XMLSEC_ERRORS_HERE,
+                    xmlSecErrorsSafeString(xmlSecKeyDataStoreGetName(x509Store)),
+                    "xmlSecMSCngX509StoreAdoptKeyStore",
+                    XMLSEC_ERRORS_R_XMLSEC_FAILED,
+                    XMLSEC_ERRORS_NO_MESSAGE);
+        return -1;
+    }
+
+    return 0 ;
+}
+
+int
+MSCryptoAppliedKeysMngrAdoptUntrustedStore(
+    xmlSecKeysMngrPtr    mngr,
+    HCERTSTORE untrustedStore
+)
+{
+    xmlSecKeyDataStorePtr x509Store ;
+
+    xmlSecAssert2(mngr != nullptr, -1) ;
+    xmlSecAssert2(untrustedStore != nullptr, -1) ;
+
+    x509Store = xmlSecKeysMngrGetDataStore(mngr, xmlSecMSCngX509StoreId);
+    if (x509Store == nullptr)
+    {
+        xmlSecError(XMLSEC_ERRORS_HERE,
+                    nullptr,
+                    "xmlSecKeysMngrGetDataStore",
+                    XMLSEC_ERRORS_R_XMLSEC_FAILED,
+                    XMLSEC_ERRORS_NO_MESSAGE) ;
+        return -1 ;
+    }
+
+    if (xmlSecMSCngX509StoreAdoptUntrustedStore(x509Store, untrustedStore) < 0)
+    {
+        xmlSecError(XMLSEC_ERRORS_HERE,
+                    xmlSecErrorsSafeString(xmlSecKeyDataStoreGetName(x509Store)),
+                    "xmlSecMSCngX509StoreAdoptKeyStore",
+                    XMLSEC_ERRORS_R_XMLSEC_FAILED,
+                    XMLSEC_ERRORS_NO_MESSAGE);
+        return -1;
+    }
+
+    return 0 ;
+}
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */
diff --git a/xmlsecurity/source/xmlsec/mscrypt/akmngr.hxx b/xmlsecurity/source/xmlsec/mscrypt/akmngr.hxx
new file mode 100644
index 000000000..04b94244b
--- /dev/null
+++ b/xmlsecurity/source/xmlsec/mscrypt/akmngr.hxx
@@ -0,0 +1,59 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+#ifndef INCLUDED_XMLSECURITY_SOURCE_XMLSEC_MSCRYPT_AKMNGR_HXX
+#define INCLUDED_XMLSECURITY_SOURCE_XMLSEC_MSCRYPT_AKMNGR_HXX
+
+#if !defined WIN32_LEAN_AND_MEAN
+# define WIN32_LEAN_AND_MEAN
+#endif
+#include <windows.h>
+#include <wincrypt.h>
+
+#include <xmlsec/xmlsec.h>
+#include <xmlsec/keys.h>
+#include <xmlsec/transforms.h>
+
+namespace xmlsecurity
+{
+
+xmlSecKeysMngrPtr MSCryptoAppliedKeysMngrCreate();
+
+int
+MSCryptoAppliedKeysMngrAdoptKeyStore(
+    xmlSecKeysMngrPtr    mngr,
+    HCERTSTORE keyStore
+) ;
+
+int
+MSCryptoAppliedKeysMngrAdoptTrustedStore(
+    xmlSecKeysMngrPtr    mngr,
+    HCERTSTORE trustedStore
+) ;
+
+int
+MSCryptoAppliedKeysMngrAdoptUntrustedStore(
+    xmlSecKeysMngrPtr    mngr,
+    HCERTSTORE untrustedStore
+) ;
+
+}
+
+#endif // INCLUDED_XMLSECURITY_SOURCE_XMLSEC_MSCRYPT_AKMNGR_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */
diff --git a/xmlsecurity/source/xmlsec/mscrypt/oid.hxx b/xmlsecurity/source/xmlsec/mscrypt/oid.hxx
new file mode 100644
index 000000000..26986aff7
--- /dev/null
+++ b/xmlsecurity/source/xmlsec/mscrypt/oid.hxx
@@ -0,0 +1,156 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#ifndef INCLUDED_XMLSECURITY_SOURCE_XMLSEC_MSCRYPT_OID_HXX
+#define INCLUDED_XMLSECURITY_SOURCE_XMLSEC_MSCRYPT_OID_HXX
+
+#include <sal/macros.h>
+
+typedef struct {
+    char const *oid;
+    char const *desc;
+} OIDItem;
+
+OIDItem OIDs[] = {
+    {"1.2.840.113549",  "RSA Data Security Inc."},
+    {"1.2.840.113549.1",    "PKCS"},
+    {"1.2.840.113549.2",    "RSA digest algorithm"},
+    {"1.2.840.113549.3",    "RSA cipher algorithm"},
+    {"1.2.840.113549.1.1",  "PKCS #1"},
+    {"1.2.840.113549.1.2",  "Unknown"},
+    {"1.2.840.113549.1.3",  "Unknown"},
+    {"1.2.840.113549.1.4",  "Unknown"},
+    {"1.2.840.113549.1.5",  "PKCS #5"},
+    {"1.2.840.113549.1.6",  "Unknown"},
+    {"1.2.840.113549.1.7",  "PKCS #7"},
+    {"1.2.840.113549.1.8",  "Unknown"},
+    {"1.2.840.113549.1.9",  "PKCS #9"},
+    {"1.2.840.113549.1.10", "Unknown"},
+    {"1.2.840.113549.1.12", "PKCS #12"},
+    {"1.2.840.113549.1.1.2",    "PKCS #1 MD2 With RSA Encryption"},
+    {"1.2.840.113549.1.1.3",    "PKCS #1 MD4 With RSA Encryption"},
+    {"1.2.840.113549.1.1.4",    "PKCS #1 MD5 With RSA Encryption"},
+    {"1.2.840.113549.1.1.1",    "PKCS #1 RSA Encryption"},
+    {"1.2.840.113549.1.1.2",    "PKCS #1 MD2 With RSA Encryption"},
+    {"1.2.840.113549.1.1.3",    "PKCS #1 MD4 With RSA Encryption"},
+    {"1.2.840.113549.1.1.4",    "PKCS #1 MD5 With RSA Encryption"},
+    {"1.2.840.113549.1.1.5",    "PKCS #1 SHA-1 With RSA Encryption"},
+    {"1.2.840.113549.1.1.5",    "PKCS #1 SHA-1 With RSA Encryption"},
+    {"1.2.840.113549.1.3.1",    "Unknown"},
+    {"1.2.840.113549.1.7.1",    "PKCS #7 Data"},
+    {"1.2.840.113549.1.7.2",    "PKCS #7 Signed Data"},
+    {"1.2.840.113549.1.7.3",    "PKCS #7 Enveloped Data"},
+    {"1.2.840.113549.1.7.4",    "PKCS #7 Signed and Enveloped Data"},
+    {"1.2.840.113549.1.7.5",    "PKCS #7 Digested Data"},
+    {"1.2.840.113549.1.7.6",    "PKCS #7 Encrypted Data"},
+    {"1.2.840.113549.1.9.1",    "PKCS #9 Email Address"},
+    {"1.2.840.113549.1.9.2",    "PKCS #9 Unstructured Name"},
+    {"1.2.840.113549.1.9.3",    "PKCS #9 Content Type"},
+    {"1.2.840.113549.1.9.4",    "PKCS #9 Message Digest"},
+    {"1.2.840.113549.1.9.5",    "PKCS #9 Signing Time"},
+    {"1.2.840.113549.1.9.6",    "PKCS #9 Counter Signature"},
+    {"1.2.840.113549.1.9.7",    "PKCS #9 Challenge Password"},
+    {"1.2.840.113549.1.9.8",    "PKCS #9 Unstructured Address"},
+    {"1.2.840.113549.1.9.9",    "PKCS #9 Extended Certificate Attributes"},
+    {"1.2.840.113549.1.9.15",   "PKCS #9 S/MIME Capabilities"},
+    {"1.2.840.113549.1.9.15.1", "Unknown"},
+    {"1.2.840.113549.3.2",  "RC2-CBC"},
+    {"1.2.840.113549.3.4",  "RC4"},
+    {"1.2.840.113549.3.7",  "DES-EDE3-CBC"},
+    {"1.2.840.113549.3.9",  "RC5-CBCPad"},
+    {"1.2.840.10046",   "ANSI X9.42"},
+    {"1.2.840.10046.2.1",   "Diffie-Hellman Public Key Algorithm"},
+    {"1.2.840.10040",   "ANSI X9.57"},
+    {"1.2.840.10040.4.1",   "ANSI X9.57 DSA Signature"},
+    {"1.2.840.10040.4.3",   "ANSI X9.57 Algorithm DSA Signature with SHA-1 Digest"},
+    {"2.5", "Directory"},
+    {"2.5.8",   "X.500-defined algorithms"},
+    {"2.5.8.1", "X.500-defined encryption algorithms"},
+    {"2.5.8.2", "Unknown"},
+    {"2.5.8.3", "Unknown"},
+    {"2.5.8.1.1",   "RSA Encryption Algorithm"},
+    {"1.3.14",  "Open Systems Implementors Workshop"},
+    {"1.3.14.3.2",  "OIW SECSIG Algorithm"},
+    {"1.3.14.3.2.2",    "Unknown"},
+    {"1.3.14.3.2.3",    "Unknown"},
+    {"1.3.14.3.2.4",    "Unknown"},
+    {"1.3.14.3.2.6",    "DES-ECB"},
+    {"1.3.14.3.2.7",    "DES-CBC"},
+    {"1.3.14.3.2.8",    "DES-OFB"},
+    {"1.3.14.3.2.9",    "DES-CFB"},
+    {"1.3.14.3.2.10",   "DES-MAC"},
+    {"1.3.14.3.2.11",   "Unknown"},
+    {"1.3.14.3.2.12",   "Unknown"},
+    {"1.3.14.3.2.13",   "Unknown"},
+    {"1.3.14.3.2.14",   "Unknown"},
+    {"1.3.14.3.2.15",   "ISO SHA with RSA Signature"},
+    {"1.3.14.3.2.16",   "Unknown"},
+    {"1.3.14.3.2.17",   "DES-EDE"},
+    {"1.3.14.3.2.18",   "Unknown"},
+    {"1.3.14.3.2.19",   "Unknown"},
+    {"1.3.14.3.2.20",   "Unknown"},
+    {"1.3.14.3.2.21",   "Unknown"},
+    {"1.3.14.3.2.22",   "Unknown"},
+    {"1.3.14.3.2.23",   "Unknown"},
+    {"1.3.14.3.2.24",   "Unknown"},
+    {"1.3.14.3.2.25",   "Unknown"},
+    {"1.3.14.3.2.26",   "SHA-1"},
+    {"1.3.14.3.2.27",   "Forgezza DSA Signature with SHA-1 Digest"},
+    {"1.3.14.3.2.28",   "Unknown"},
+    {"1.3.14.3.2.29",   "Unknown"},
+    {"1.3.14.7.2",  "Unknown"},
+    {"1.3.14.7.2.1",    "Unknown"},
+    {"1.3.14.7.2.2",    "Unknown"},
+    {"1.3.14.7.2.3",    "Unknown"},
+    {"1.3.14.7.2.2.1",  "Unknown"},
+    {"1.3.14.7.2.3.1",  "Unknown"},
+    {"2.16.840.1.101.2.1",  "US DOD Infosec"},
+    {"2.16.840.1.101.2.1.1.1",  "Unknown"},
+    {"2.16.840.1.101.2.1.1.2",  "MISSI DSS Algorithm (Old)"},
+    {"2.16.840.1.101.2.1.1.3",  "Unknown"},
+    {"2.16.840.1.101.2.1.1.4",  "Skipjack CBC64"},
+    {"2.16.840.1.101.2.1.1.5",  "Unknown"},
+    {"2.16.840.1.101.2.1.1.6",  "Unknown"},
+    {"2.16.840.1.101.2.1.1.7",  "Unknown"},
+    {"2.16.840.1.101.2.1.1.8",  "Unknown"},
+    {"2.16.840.1.101.2.1.1.9",  "Unknown"},
+    {"2.16.840.1.101.2.1.1.10", "MISSI KEA Algorithm"},
+    {"2.16.840.1.101.2.1.1.11", "Unknown"},
+    {"2.16.840.1.101.2.1.1.12", "MISSI KEA and DSS Algorithm (Old)"},
+    {"2.16.840.1.101.2.1.1.13", "Unknown"},
+    {"2.16.840.1.101.2.1.1.14", "Unknown"},
+    {"2.16.840.1.101.2.1.1.15", "Unknown"},
+    {"2.16.840.1.101.2.1.1.16", "Unknown"},
+    {"2.16.840.1.101.2.1.1.17", "Unknown"},
+    {"2.16.840.1.101.2.1.1.18", "Unknown"},
+    {"2.16.840.1.101.2.1.1.19", "MISSI DSS Algorithm"},
+    {"2.16.840.1.101.2.1.1.20", "MISSI KEA and DSS Algorithm"},
+    {"2.16.840.1.101.2.1.1.21", "Unknown"},
+    {"1.2.643.2.2.35.0", "GOST_R_34.10-2001_Test"},
+    {"1.2.643.2.2.35.1", "GOST_R_34.10-2001_Sign_DH_PRO"},
+    {"1.2.643.2.2.35.2", "GOST_R_34.10-2001_Sign_DH_CARD"},
+    {"1.2.643.2.2.35.3", "GOST_R_34.10-2001_Sign_DH"},
+    {"1.2.643.2.2.36.0", "GOST_R_34.10-2001_Sign_DH_PRO"}
+};
+
+const int nOID = SAL_N_ELEMENTS(OIDs);
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/xmlsec/mscrypt/sanextension_mscryptimpl.cxx b/xmlsecurity/source/xmlsec/mscrypt/sanextension_mscryptimpl.cxx
new file mode 100644
index 000000000..8c58ffada
--- /dev/null
+++ b/xmlsecurity/source/xmlsec/mscrypt/sanextension_mscryptimpl.cxx
@@ -0,0 +1,135 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <sal/config.h>
+
+#include <memory>
+
+#include <rtl/uuid.h>
+#include <rtl/ustring.hxx>
+#include <com/sun/star/security/ExtAltNameType.hpp>
+#include <com/sun/star/security/CertAltNameEntry.hpp>
+#include <com/sun/star/beans/NamedValue.hpp>
+#include <comphelper/sequence.hxx>
+#include <o3tl/char16_t2wchar_t.hxx>
+
+#include "sanextension_mscryptimpl.hxx"
+
+using namespace ::com::sun::star;
+using namespace ::com::sun::star::uno ;
+using namespace ::com::sun::star::security ;
+
+using ::com::sun::star::security::XCertificateExtension ;
+
+
+SanExtensionImpl::SanExtensionImpl() :
+    m_critical( false )
+{
+}
+
+SanExtensionImpl::~SanExtensionImpl() {
+}
+
+
+//Methods from XCertificateExtension
+sal_Bool SAL_CALL SanExtensionImpl::isCritical() {
+    return m_critical ;
+}
+
+css::uno::Sequence< sal_Int8 > SAL_CALL SanExtensionImpl::getExtensionId() {
+    return m_xExtnId ;
+}
+
+css::uno::Sequence< sal_Int8 > SAL_CALL SanExtensionImpl::getExtensionValue() {
+    return m_xExtnValue ;
+}
+
+//Methods from XSanExtension
+css::uno::Sequence< css::security::CertAltNameEntry > SAL_CALL SanExtensionImpl::getAlternativeNames(){
+
+    if (!m_Entries.hasElements())
+    {
+        CERT_ALT_NAME_INFO *subjectName;
+        DWORD size;
+        CryptDecodeObjectEx(X509_ASN_ENCODING, X509_ALTERNATE_NAME, reinterpret_cast<unsigned char*>(m_xExtnValue.getArray()), m_xExtnValue.getLength(), CRYPT_DECODE_ALLOC_FLAG | CRYPT_DECODE_NOCOPY_FLAG, nullptr,&subjectName, &size);
+
+        auto arrCertAltNameEntry = std::make_unique<CertAltNameEntry[]>(subjectName->cAltEntry);
+
+        for (unsigned int i = 0; i < static_cast<unsigned int>(subjectName->cAltEntry); i++){
+          PCERT_ALT_NAME_ENTRY pEntry = &subjectName->rgAltEntry[i];
+
+          switch(pEntry->dwAltNameChoice) {
+            case CERT_ALT_NAME_OTHER_NAME :
+                {
+                    arrCertAltNameEntry[i].Type = ExtAltNameType_OTHER_NAME;
+                    PCERT_OTHER_NAME pOtherName = pEntry->pOtherName;
+
+                    css::beans::NamedValue otherNameProp;
+                    otherNameProp.Name = OUString::createFromAscii(pOtherName->pszObjId);
+
+                    Sequence< sal_Int8 > otherName( pOtherName->Value.cbData ) ;
+                    for( unsigned int n = 0; n < static_cast<unsigned int>(pOtherName->Value.cbData) ; n ++ )
+                        otherName[n] = *( pOtherName->Value.pbData + n ) ;
+
+                    otherNameProp.Value <<= otherName;
+
+                    arrCertAltNameEntry[i].Value <<= otherNameProp;
+                    break;
+                }
+            case CERT_ALT_NAME_RFC822_NAME :
+                arrCertAltNameEntry[i].Type = ExtAltNameType_RFC822_NAME;
+                arrCertAltNameEntry[i].Value <<= OUString(o3tl::toU(pEntry->pwszRfc822Name));
+                break;
+            case CERT_ALT_NAME_DNS_NAME :
+                arrCertAltNameEntry[i].Type = ExtAltNameType_DNS_NAME;
+                arrCertAltNameEntry[i].Value <<= OUString(o3tl::toU(pEntry->pwszDNSName));
+                break;
+            case CERT_ALT_NAME_DIRECTORY_NAME :
+                {
+                    arrCertAltNameEntry[i].Type = ExtAltNameType_DIRECTORY_NAME;
+                    break;
+                }
+            case CERT_ALT_NAME_URL :
+                arrCertAltNameEntry[i].Type = ExtAltNameType_URL;
+                arrCertAltNameEntry[i].Value <<= OUString(o3tl::toU(pEntry->pwszURL));
+                break;
+            case CERT_ALT_NAME_IP_ADDRESS :
+                {
+                    arrCertAltNameEntry[i].Type = ExtAltNameType_IP_ADDRESS;
+
+                    Sequence< sal_Int8 > ipAddress( pEntry->IPAddress.cbData ) ;
+                    for( unsigned int n = 0; n < pEntry->IPAddress.cbData ; n ++ )
+                        ipAddress[n] = *( pEntry->IPAddress.pbData + n ) ;
+
+                    arrCertAltNameEntry[i].Value <<= ipAddress;
+                    break;
+                }
+            case CERT_ALT_NAME_REGISTERED_ID :
+                arrCertAltNameEntry[i].Type = ExtAltNameType_REGISTERED_ID;
+                arrCertAltNameEntry[i].Value <<= OUString::createFromAscii(pEntry->pszRegisteredID);
+                break;
+          }
+        }
+        m_Entries = ::comphelper::arrayToSequence< css::security::CertAltNameEntry >(arrCertAltNameEntry.get(), subjectName->cAltEntry);
+    }
+
+    return m_Entries;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/xmlsec/mscrypt/sanextension_mscryptimpl.hxx b/xmlsecurity/source/xmlsec/mscrypt/sanextension_mscryptimpl.hxx
new file mode 100644
index 000000000..9f005a886
--- /dev/null
+++ b/xmlsecurity/source/xmlsec/mscrypt/sanextension_mscryptimpl.hxx
@@ -0,0 +1,69 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#ifndef INCLUDED_XMLSECURITY_SOURCE_XMLSEC_MSCRYPT_SANEXTENSION_MSCRYPTIMPL_HXX
+#define INCLUDED_XMLSECURITY_SOURCE_XMLSEC_MSCRYPT_SANEXTENSION_MSCRYPTIMPL_HXX
+
+#if !defined WIN32_LEAN_AND_MEAN
+# define WIN32_LEAN_AND_MEAN
+#endif
+#include <Windows.h>
+#include <WinCrypt.h>
+#include <sal/config.h>
+#include <rtl/ustring.hxx>
+#include <cppuhelper/factory.hxx>
+#include <cppuhelper/implbase.hxx>
+#include <com/sun/star/uno/Exception.hpp>
+#include <com/sun/star/uno/SecurityException.hpp>
+#include <com/sun/star/security/XCertificateExtension.hpp>
+#include <com/sun/star/security/XSanExtension.hpp>
+#include <com/sun/star/security/CertAltNameEntry.hpp>
+
+class SanExtensionImpl : public ::cppu::WeakImplHelper<
+    css::security::XSanExtension >
+{
+    private:
+        bool m_critical ;
+        css::uno::Sequence< sal_Int8 > m_xExtnId ;
+        css::uno::Sequence< sal_Int8 > m_xExtnValue ;
+
+        css::uno::Sequence< css::security::CertAltNameEntry > m_Entries;
+
+    public:
+        SanExtensionImpl() ;
+        virtual ~SanExtensionImpl() override;
+
+        //Methods from XCertificateExtension
+        virtual sal_Bool SAL_CALL isCritical() override;
+
+        virtual css::uno::Sequence< sal_Int8 > SAL_CALL getExtensionId() override;
+
+        virtual css::uno::Sequence< sal_Int8 > SAL_CALL getExtensionValue() override;
+
+        //Methods from XSanExtension
+
+        virtual css::uno::Sequence< css::security::CertAltNameEntry > SAL_CALL getAlternativeNames() override;
+
+        //Helper method
+        void setCertExtn( unsigned char* value, unsigned int vlen, unsigned char* id, unsigned int idlen, bool critical ) ;
+} ;
+
+#endif // INCLUDED_XMLSECURITY_SOURCE_XMLSEC_MSCRYPT_SANEXTENSION_MSCRYPTIMPL_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/xmlsec/mscrypt/securityenvironment_mscryptimpl.cxx b/xmlsecurity/source/xmlsec/mscrypt/securityenvironment_mscryptimpl.cxx
new file mode 100644
index 000000000..01b27fb97
--- /dev/null
+++ b/xmlsecurity/source/xmlsec/mscrypt/securityenvironment_mscryptimpl.cxx
@@ -0,0 +1,1066 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <sal/config.h>
+
+#include <cstddef>
+#include <string.h>
+
+#if !defined WIN32_LEAN_AND_MEAN
+# define WIN32_LEAN_AND_MEAN
+#endif
+#include <Windows.h>
+#include <WinCrypt.h>
+#include <sal/macros.h>
+#include <osl/thread.h>
+#include "securityenvironment_mscryptimpl.hxx"
+
+#include "x509certificate_mscryptimpl.hxx"
+#include <comphelper/servicehelper.hxx>
+#include <com/sun/star/lang/XMultiServiceFactory.hpp>
+#include <com/sun/star/uno/XComponentContext.hpp>
+#include <cppuhelper/supportsservice.hxx>
+#include <xmlsec-wrapper.h>
+#include "akmngr.hxx"
+
+#include <biginteger.hxx>
+
+#include <comphelper/windowserrorstring.hxx>
+#include <sal/log.hxx>
+#include <rtl/locale.h>
+#include <osl/nlsupport.h>
+#include <osl/process.h>
+#include <o3tl/char16_t2wchar_t.hxx>
+#include <svl/cryptosign.hxx>
+
+using namespace ::com::sun::star;
+using namespace ::com::sun::star::lang ;
+using ::com::sun::star::lang::XMultiServiceFactory ;
+using ::com::sun::star::lang::XSingleServiceFactory ;
+
+using ::com::sun::star::xml::crypto::XSecurityEnvironment ;
+using ::com::sun::star::security::XCertificate ;
+
+static X509Certificate_MSCryptImpl* MswcryCertContextToXCert( PCCERT_CONTEXT cert ) ;
+
+namespace {
+
+struct CertErrorToString{
+    DWORD error;
+    char const * name;
+};
+
+}
+
+CertErrorToString const arErrStrings[] =
+{
+    { 0x00000000, "CERT_TRUST_NO_ERROR"},
+    { 0x00000001, "CERT_TRUST_IS_NOT_TIME_VALID"},
+    { 0x00000002, "CERT_TRUST_IS_NOT_TIME_NESTED"},
+    { 0x00000004, "CERT_TRUST_IS_REVOKED" },
+    { 0x00000008, "CERT_TRUST_IS_NOT_SIGNATURE_VALID" },
+    { 0x00000010, "CERT_TRUST_IS_NOT_SIGNATURE_VALID"},
+    { 0x00000020, "CERT_TRUST_IS_UNTRUSTED_ROOT"},
+    { 0x00000040, "CERT_TRUST_REVOCATION_STATUS_UNKNOWN"},
+    { 0x00000080, "CERT_TRUST_IS_CYCLIC"},
+    { 0x00000100, "CERT_TRUST_INVALID_EXTENSION"},
+    { 0x00000200, "CERT_TRUST_INVALID_POLICY_CONSTRAINTS"},
+    { 0x00000400, "CERT_TRUST_INVALID_BASIC_CONSTRAINTS"},
+    { 0x00000800, "CERT_TRUST_INVALID_NAME_CONSTRAINTS"},
+    { 0x00001000, "CERT_TRUST_HAS_NOT_SUPPORTED_NAME_CONSTRAINT"},
+    { 0x00002000, "CERT_TRUST_HAS_NOT_DEFINED_NAME_CONSTRAINT"},
+    { 0x00004000, "CERT_TRUST_HAS_NOT_PERMITTED_NAME_CONSTRAINT"},
+    { 0x00008000, "CERT_TRUST_HAS_EXCLUDED_NAME_CONSTRAINT"},
+    { 0x01000000, "CERT_TRUST_IS_OFFLINE_REVOCATION"},
+    { 0x02000000, "CERT_TRUST_NO_ISSUANCE_CHAIN_POLICY"},
+    { 0x04000000, "CERT_TRUST_IS_EXPLICIT_DISTRUST"},
+    { 0x08000000, "CERT_TRUST_HAS_NOT_SUPPORTED_CRITICAL_EXT"},
+    //Chain errors
+    { 0x00010000, "CERT_TRUST_IS_PARTIAL_CHAIN"},
+    { 0x00020000, "CERT_TRUST_CTL_IS_NOT_TIME_VALID"},
+    { 0x00040000, "CERT_TRUST_CTL_IS_NOT_SIGNATURE_VALID"},
+    { 0x00080000, "CERT_TRUST_CTL_IS_NOT_VALID_FOR_USAGE"}
+};
+
+static void traceTrustStatus(DWORD err)
+{
+    if (err == 0)
+        SAL_INFO("xmlsecurity.xmlsec", "  " << arErrStrings[0].name);
+    for (std::size_t i = 1; i < SAL_N_ELEMENTS(arErrStrings); i++)
+    {
+        if (arErrStrings[i].error & err)
+            SAL_INFO("xmlsecurity.xmlsec", "  " << arErrStrings[i].name);
+    }
+}
+
+SecurityEnvironment_MSCryptImpl::SecurityEnvironment_MSCryptImpl( const uno::Reference< uno::XComponentContext >& xContext ) : m_hProv( NULL ) , m_pszContainer( nullptr ) , m_hKeyStore( nullptr ), m_hCertStore( nullptr ), m_hMySystemStore(nullptr), m_hRootSystemStore(nullptr), m_hTrustSystemStore(nullptr), m_hCaSystemStore(nullptr), m_bEnableDefault( false ){
+
+    m_xServiceManager.set(xContext, uno::UNO_QUERY);
+}
+
+SecurityEnvironment_MSCryptImpl::~SecurityEnvironment_MSCryptImpl() {
+
+    if( m_hProv != NULL ) {
+        CryptReleaseContext( m_hProv, 0 ) ;
+        m_hProv = NULL ;
+    }
+
+    if( m_pszContainer != nullptr ) {
+        //TODO: Don't know whether or not it should be released now.
+        m_pszContainer = nullptr ;
+    }
+
+    if( m_hCertStore != nullptr ) {
+        CertCloseStore( m_hCertStore, CERT_CLOSE_STORE_FORCE_FLAG ) ;
+        m_hCertStore = nullptr ;
+    }
+
+    if( m_hKeyStore != nullptr ) {
+        CertCloseStore( m_hKeyStore, CERT_CLOSE_STORE_FORCE_FLAG ) ;
+        m_hKeyStore = nullptr ;
+    }
+
+    //i120675, close the store handles
+    if( m_hMySystemStore != nullptr ) {
+        CertCloseStore( m_hMySystemStore, CERT_CLOSE_STORE_CHECK_FLAG ) ;
+        m_hMySystemStore = nullptr ;
+    }
+
+    if( m_hRootSystemStore != nullptr ) {
+        CertCloseStore( m_hRootSystemStore, CERT_CLOSE_STORE_CHECK_FLAG ) ;
+        m_hRootSystemStore = nullptr ;
+    }
+
+    if( m_hTrustSystemStore != nullptr ) {
+        CertCloseStore( m_hTrustSystemStore, CERT_CLOSE_STORE_CHECK_FLAG ) ;
+        m_hTrustSystemStore = nullptr ;
+    }
+
+    if( m_hCaSystemStore != nullptr ) {
+        CertCloseStore( m_hCaSystemStore, CERT_CLOSE_STORE_CHECK_FLAG ) ;
+        m_hCaSystemStore = nullptr ;
+    }
+}
+
+/* XServiceInfo */
+OUString SAL_CALL SecurityEnvironment_MSCryptImpl::getImplementationName() {
+    return "com.sun.star.xml.crypto.SecurityEnvironment";
+}
+
+/* XServiceInfo */
+sal_Bool SAL_CALL SecurityEnvironment_MSCryptImpl::supportsService( const OUString& serviceName) {
+    return cppu::supportsService(this, serviceName);
+}
+/* XServiceInfo */
+uno::Sequence< OUString > SAL_CALL SecurityEnvironment_MSCryptImpl::getSupportedServiceNames() {
+    uno::Sequence<OUString> seqServiceNames { "com.sun.star.xml.crypto.SecurityEnvironment" };
+    return seqServiceNames ;
+}
+
+/* XUnoTunnel */
+UNO3_GETIMPLEMENTATION_IMPL(SecurityEnvironment_MSCryptImpl);
+
+HCRYPTPROV SecurityEnvironment_MSCryptImpl::getCryptoProvider() {
+    return m_hProv ;
+}
+
+void SecurityEnvironment_MSCryptImpl::setCryptoProvider( HCRYPTPROV aProv ) {
+    if( m_hProv != NULL ) {
+        CryptReleaseContext( m_hProv, 0 ) ;
+        m_hProv = NULL ;
+    }
+
+    if( aProv != NULL ) {
+        m_hProv = aProv ;
+    }
+}
+
+LPCTSTR SecurityEnvironment_MSCryptImpl::getKeyContainer() {
+    return m_pszContainer ;
+}
+
+void SecurityEnvironment_MSCryptImpl::setKeyContainer( LPCTSTR aKeyContainer ) {
+    //TODO: Don't know whether or not it should be copied.
+    m_pszContainer = aKeyContainer ;
+}
+
+
+HCERTSTORE SecurityEnvironment_MSCryptImpl::getCryptoSlot() {
+    return m_hKeyStore ;
+}
+
+void SecurityEnvironment_MSCryptImpl::setCryptoSlot( HCERTSTORE aSlot) {
+    if( m_hKeyStore != nullptr ) {
+        CertCloseStore( m_hKeyStore, CERT_CLOSE_STORE_FORCE_FLAG ) ;
+        m_hKeyStore = nullptr ;
+    }
+
+    if( aSlot != nullptr ) {
+        m_hKeyStore = CertDuplicateStore( aSlot ) ;
+    }
+}
+
+HCERTSTORE SecurityEnvironment_MSCryptImpl::getCertDb() {
+    return m_hCertStore ;
+}
+
+void SecurityEnvironment_MSCryptImpl::setCertDb( HCERTSTORE aCertDb ) {
+    if( m_hCertStore != nullptr ) {
+        CertCloseStore( m_hCertStore, CERT_CLOSE_STORE_FORCE_FLAG ) ;
+        m_hCertStore = nullptr ;
+    }
+
+    if( aCertDb != nullptr ) {
+        m_hCertStore = CertDuplicateStore( aCertDb ) ;
+    }
+}
+
+#ifdef SAL_LOG_INFO
+
+// Based on sample code from MSDN
+
+static OUString get_system_name(const void *pvSystemStore,
+                            DWORD dwFlags)
+{
+    LPCWSTR ppwszSystemName;
+    if (dwFlags & CERT_SYSTEM_STORE_RELOCATE_FLAG)
+    {
+        _CERT_SYSTEM_STORE_RELOCATE_PARA const * pRelocatePara;
+        pRelocatePara = static_cast<_CERT_SYSTEM_STORE_RELOCATE_PARA const *>(pvSystemStore);
+        ppwszSystemName = pRelocatePara->pwszSystemStore;
+    }
+    else
+    {
+        ppwszSystemName = static_cast<LPCWSTR>(pvSystemStore);
+    }
+    return o3tl::toU(ppwszSystemName);
+}
+
+extern "C" {
+
+static BOOL WINAPI cert_enum_physical_store_callback(const void *,
+                                                         DWORD dwFlags,
+                                                         LPCWSTR pwszStoreName,
+                                                         PCERT_PHYSICAL_STORE_INFO,
+                                                         void *,
+                                                         void *)
+{
+    OUString name(o3tl::toU(pwszStoreName));
+    if (dwFlags & CERT_PHYSICAL_STORE_PREDEFINED_ENUM_FLAG)
+        name += " (implicitly created)";
+    SAL_INFO("xmlsecurity.xmlsec", "  Physical store: " << name);
+
+    return TRUE;
+}
+
+static BOOL WINAPI cert_enum_system_store_callback(const void *pvSystemStore,
+                                                       DWORD dwFlags,
+                                                       PCERT_SYSTEM_STORE_INFO,
+                                                       void *,
+                                                       void *)
+{
+    SAL_INFO("xmlsecurity.xmlsec", "System store: " << get_system_name(pvSystemStore, dwFlags));
+
+    if (!CertEnumPhysicalStore(pvSystemStore,
+                               dwFlags,
+                               nullptr,
+                               cert_enum_physical_store_callback))
+    {
+        DWORD dwErr = GetLastError();
+        if (!(ERROR_FILE_NOT_FOUND == dwErr ||
+              ERROR_NOT_SUPPORTED == dwErr))
+        {
+            SAL_WARN("xmlsecurity.xmlsec", "CertEnumPhysicalStore failed:" << WindowsErrorString(GetLastError()));
+        }
+    }
+    return TRUE;
+}
+
+}
+
+#endif
+
+//Methods from XSecurityEnvironment
+uno::Sequence< uno::Reference < XCertificate > > SecurityEnvironment_MSCryptImpl::getPersonalCertificates()
+{
+    sal_Int32 length ;
+    X509Certificate_MSCryptImpl* xcert ;
+    std::vector< X509Certificate_MSCryptImpl* > certsList ;
+    PCCERT_CONTEXT pCertContext = nullptr;
+
+    //firstly, we try to find private keys in given key store.
+    if( m_hKeyStore != nullptr ) {
+        pCertContext = CertEnumCertificatesInStore( m_hKeyStore, pCertContext );
+        while (pCertContext)
+        {
+            xcert = MswcryCertContextToXCert( pCertContext ) ;
+            if( xcert != nullptr )
+                certsList.push_back( xcert ) ;
+            pCertContext = CertEnumCertificatesInStore( m_hKeyStore, pCertContext );
+        }
+    }
+
+    //Thirdly, we try to find certificate from system default key store.
+    if( m_bEnableDefault ) {
+        HCERTSTORE hSystemKeyStore ;
+        DWORD      dwKeySpec;
+        NCRYPT_KEY_HANDLE hCryptKey;
+
+#ifdef SAL_LOG_INFO
+        CertEnumSystemStore(CERT_SYSTEM_STORE_CURRENT_USER, nullptr, nullptr, cert_enum_system_store_callback);
+#endif
+
+        hSystemKeyStore = CertOpenSystemStoreW( 0, L"MY" ) ;
+        if( hSystemKeyStore != nullptr ) {
+            pCertContext = CertEnumCertificatesInStore( hSystemKeyStore, pCertContext );
+            while (pCertContext)
+            {
+                // for checking whether the certificate is a personal certificate or not.
+                DWORD dwFlags = CRYPT_ACQUIRE_COMPARE_KEY_FLAG | CRYPT_ACQUIRE_ONLY_NCRYPT_KEY_FLAG;
+                HCRYPTPROV_OR_NCRYPT_KEY_HANDLE* phCryptProvOrNCryptKey = &hCryptKey;
+                if(!(CryptAcquireCertificatePrivateKey(pCertContext,
+                        dwFlags,
+                        nullptr,
+                        phCryptProvOrNCryptKey,
+                        &dwKeySpec,
+                        nullptr)))
+                {
+                    // Not Privatekey found. SKIP this one.
+                    pCertContext = CertEnumCertificatesInStore( hSystemKeyStore, pCertContext );
+                    continue;
+                }
+                // then TODO : Check the personal cert is valid or not.
+
+                xcert = MswcryCertContextToXCert( pCertContext ) ;
+                if( xcert != nullptr )
+                    certsList.push_back( xcert ) ;
+                pCertContext = CertEnumCertificatesInStore( hSystemKeyStore, pCertContext );
+            }
+        }
+
+        CertCloseStore( hSystemKeyStore, CERT_CLOSE_STORE_CHECK_FLAG ) ;
+    }
+
+    length = certsList.size() ;
+    if( length != 0 ) {
+        int i = 0;
+        uno::Sequence< uno::Reference< XCertificate > > certSeq( length ) ;
+
+        for( const auto& rXCert : certsList ) {
+            certSeq[i] = rXCert ;
+            ++i;
+        }
+
+        return certSeq ;
+    }
+
+    return uno::Sequence< uno::Reference< XCertificate > >() ;
+}
+
+
+uno::Reference< XCertificate > SecurityEnvironment_MSCryptImpl::getCertificate( const OUString& issuerName, const uno::Sequence< sal_Int8 >& serialNumber ) {
+    unsigned int i ;
+    X509Certificate_MSCryptImpl *xcert = nullptr ;
+    PCCERT_CONTEXT pCertContext = nullptr ;
+    HCERTSTORE hCertStore = nullptr ;
+    CRYPT_INTEGER_BLOB cryptSerialNumber ;
+    CERT_INFO certInfo ;
+
+    // for correct encoding
+    sal_uInt16 encoding ;
+    rtl_Locale *pLocale = nullptr ;
+    osl_getProcessLocale( &pLocale ) ;
+    encoding = osl_getTextEncodingFromLocale( pLocale ) ;
+
+    //Create cert info from issue and serial
+    LPCWSTR pszName = o3tl::toW( issuerName.getStr() );
+
+    if( ! ( CertStrToNameW(
+        X509_ASN_ENCODING | PKCS_7_ASN_ENCODING ,
+        pszName ,
+        CERT_X500_NAME_STR | CERT_NAME_STR_REVERSE_FLAG | CERT_NAME_STR_ENABLE_UTF8_UNICODE_FLAG,
+        nullptr ,
+        nullptr ,
+        &certInfo.Issuer.cbData, nullptr ) )
+    ) {
+        return nullptr ;
+    }
+
+    certInfo.Issuer.pbData = static_cast<BYTE*>(malloc( certInfo.Issuer.cbData ));
+    if(!certInfo.Issuer.pbData)
+        throw uno::RuntimeException() ;
+
+    if( ! ( CertStrToNameW(
+        X509_ASN_ENCODING | PKCS_7_ASN_ENCODING ,
+        pszName ,
+        CERT_X500_NAME_STR | CERT_NAME_STR_REVERSE_FLAG | CERT_NAME_STR_ENABLE_UTF8_UNICODE_FLAG,
+        nullptr ,
+        certInfo.Issuer.pbData ,
+        &certInfo.Issuer.cbData, nullptr ) )
+    ) {
+        free( certInfo.Issuer.pbData ) ;
+        return nullptr ;
+    }
+
+    //Get the SerialNumber
+    cryptSerialNumber.cbData = serialNumber.getLength() ;
+    cryptSerialNumber.pbData = static_cast<BYTE*>(malloc( cryptSerialNumber.cbData));
+    if (!cryptSerialNumber.pbData)
+    {
+        free( certInfo.Issuer.pbData ) ;
+        throw uno::RuntimeException() ;
+    }
+    for( i = 0; i < cryptSerialNumber.cbData; i ++ )
+        cryptSerialNumber.pbData[i] = serialNumber[ cryptSerialNumber.cbData - i - 1 ] ;
+
+    certInfo.SerialNumber.cbData = cryptSerialNumber.cbData ;
+    certInfo.SerialNumber.pbData = cryptSerialNumber.pbData ;
+
+    // Get the Cert from all store.
+    for( i = 0 ; i < 6 ; i ++ )
+    {
+        switch(i)
+        {
+        case 0:
+            if(m_hKeyStore == nullptr) continue ;
+            hCertStore = m_hKeyStore ;
+            break;
+        case 1:
+            if(m_hCertStore == nullptr) continue ;
+            hCertStore = m_hCertStore ;
+            break;
+        case 2:
+            hCertStore = CertOpenSystemStoreW( 0, L"MY" ) ;
+            if(hCertStore == nullptr || !m_bEnableDefault) continue ;
+            break;
+        case 3:
+            hCertStore = CertOpenSystemStoreW( 0, L"Root" ) ;
+            if(hCertStore == nullptr || !m_bEnableDefault) continue ;
+            break;
+        case 4:
+            hCertStore = CertOpenSystemStoreW( 0, L"Trust" ) ;
+            if(hCertStore == nullptr || !m_bEnableDefault) continue ;
+            break;
+        case 5:
+            hCertStore = CertOpenSystemStoreW( 0, L"CA" ) ;
+            if(hCertStore == nullptr || !m_bEnableDefault) continue ;
+            break;
+        default:
+            i=6;
+            continue;
+        }
+
+/*******************************************************************************
+ * This code reserved for remind us there are another way to find one cert by
+ * IssuerName&serialnumber. You can use the code to replaced the function
+ * CertFindCertificateInStore IF and ONLY IF you must find one special cert in
+ * certStore but can not be found by CertFindCertificateInStore , then , you
+ * should also change the same part in libxmlsec/.../src/mscrypto/x509vfy.c#875.
+ * By Chandler Peng(chandler.peng@sun.com)
+ *****/
+/*******************************************************************************
+        pCertContext = NULL ;
+        found = 0;
+        do{
+            //  1. enum the certs has same string in the issuer string.
+            pCertContext = CertEnumCertificatesInStore( hCertStore , pCertContext ) ;
+            if( pCertContext != NULL )
+            {
+                // 2. check the cert's issuer name .
+                char* issuer = NULL ;
+                DWORD cbIssuer = 0 ;
+
+                cbIssuer = CertNameToStr(
+                    X509_ASN_ENCODING | PKCS_7_ASN_ENCODING ,
+                    &( pCertContext->pCertInfo->Issuer ),
+                    CERT_X500_NAME_STR | CERT_NAME_STR_REVERSE_FLAG ,
+                    NULL, 0
+                ) ;
+
+                if( cbIssuer == 0 ) continue ; // discard this cert;
+
+                issuer = (char *)malloc( cbIssuer ) ;
+                if( issuer == NULL )  // discard this cert;
+                {
+                    free( cryptSerialNumber.pbData) ;
+                    free( certInfo.Issuer.pbData ) ;
+                    CertFreeCertificateContext( pCertContext ) ;
+                    if(i != 0 && i != 1) CertCloseStore( hCertStore, CERT_CLOSE_STORE_CHECK_FLAG ) ;
+                    throw RuntimeException() ;
+                }
+
+                cbIssuer = CertNameToStr(
+                    X509_ASN_ENCODING | PKCS_7_ASN_ENCODING ,
+                    &( pCertContext->pCertInfo->Issuer ),
+                    CERT_X500_NAME_STR | CERT_NAME_STR_REVERSE_FLAG ,
+                    issuer, cbIssuer
+                ) ;
+
+                if( cbIssuer <= 0 )
+                {
+                    free( issuer ) ;
+                    continue ;// discard this cert;
+                }
+
+                if(strncmp(pszName , issuer , cbIssuer) != 0)
+                {
+                    free( issuer ) ;
+                    continue ;// discard this cert;
+                }
+                free( issuer ) ;
+
+                // 3. check the serial number.
+                if( memcmp( cryptSerialNumber.pbData , pCertContext->pCertInfo->SerialNumber.pbData  , cryptSerialNumber.cbData ) != 0 )
+                {
+                    continue ;// discard this cert;
+                }
+
+                // 4. confirm and break;
+                found = 1;
+                break ;
+            }
+
+        }while(pCertContext);
+
+        if(i != 0 && i != 1) CertCloseStore( hCertStore, CERT_CLOSE_STORE_CHECK_FLAG ) ;
+        if( found != 0 ) break; // Found the certificate.
+********************************************************************************/
+
+        pCertContext = CertFindCertificateInStore(
+            hCertStore,
+            X509_ASN_ENCODING | PKCS_7_ASN_ENCODING,
+            0,
+            CERT_FIND_SUBJECT_CERT,
+            &certInfo,
+            nullptr
+        ) ;
+
+        if(i != 0 && i != 1) CertCloseStore( hCertStore, CERT_CLOSE_STORE_CHECK_FLAG ) ;
+        if( pCertContext != nullptr ) break ; // Found the certificate.
+
+    }
+
+    free(cryptSerialNumber.pbData);
+    free(certInfo.Issuer.pbData);
+
+    if( pCertContext != nullptr ) {
+        xcert = MswcryCertContextToXCert(pCertContext);
+        CertFreeCertificateContext(pCertContext);
+    } else {
+        xcert = nullptr ;
+    }
+
+    return xcert ;
+}
+
+uno::Reference< XCertificate > SecurityEnvironment_MSCryptImpl::getCertificate( const OUString& issuerName, const OUString& serialNumber ) {
+    uno::Sequence< sal_Int8 > serial = xmlsecurity::numericStringToBigInteger( serialNumber ) ;
+    return getCertificate( issuerName, serial ) ;
+}
+
+uno::Sequence< uno::Reference < XCertificate > > SecurityEnvironment_MSCryptImpl::buildCertificatePath( const uno::Reference< XCertificate >& begin ) {
+    PCCERT_CHAIN_CONTEXT pChainContext ;
+    PCCERT_CONTEXT pCertContext ;
+    const X509Certificate_MSCryptImpl* xcert ;
+
+    CERT_ENHKEY_USAGE   enhKeyUsage ;
+    CERT_USAGE_MATCH    certUsage ;
+    CERT_CHAIN_PARA     chainPara ;
+
+    enhKeyUsage.cUsageIdentifier = 0 ;
+    enhKeyUsage.rgpszUsageIdentifier = nullptr ;
+    certUsage.dwType = USAGE_MATCH_TYPE_AND ;
+    certUsage.Usage = enhKeyUsage ;
+    chainPara.cbSize = sizeof( CERT_CHAIN_PARA ) ;
+    chainPara.RequestedUsage = certUsage ;
+
+    uno::Reference< XUnoTunnel > xCertTunnel( begin, uno::UNO_QUERY_THROW ) ;
+    xcert = reinterpret_cast<X509Certificate_MSCryptImpl*>(xCertTunnel->getSomething( X509Certificate_MSCryptImpl::getUnoTunnelId() ));
+    if( xcert == nullptr ) {
+        throw uno::RuntimeException() ;
+    }
+
+    pCertContext = xcert->getMswcryCert() ;
+
+    pChainContext = nullptr ;
+
+    bool bChain = false;
+    if( pCertContext != nullptr )
+    {
+        HCERTSTORE hAdditionalStore = nullptr;
+        HCERTSTORE hCollectionStore = nullptr;
+        if (m_hCertStore && m_hKeyStore)
+        {
+            //Merge m_hCertStore and m_hKeyStore into one store.
+            hCollectionStore = CertOpenStore(
+                CERT_STORE_PROV_COLLECTION ,
+                0 ,
+                NULL ,
+                0 ,
+                nullptr
+                ) ;
+            if (hCollectionStore != nullptr)
+            {
+                CertAddStoreToCollection (
+                     hCollectionStore ,
+                     m_hCertStore ,
+                     CERT_PHYSICAL_STORE_ADD_ENABLE_FLAG ,
+                     0) ;
+                CertAddStoreToCollection (
+                     hCollectionStore ,
+                     m_hCertStore ,
+                     CERT_PHYSICAL_STORE_ADD_ENABLE_FLAG ,
+                     0) ;
+                hAdditionalStore = hCollectionStore;
+            }
+
+        }
+
+        //if the merge of both stores failed then we add only m_hCertStore
+        if (hAdditionalStore == nullptr && m_hCertStore)
+            hAdditionalStore = m_hCertStore;
+        else if (hAdditionalStore == nullptr && m_hKeyStore)
+            hAdditionalStore = m_hKeyStore;
+        else
+            hAdditionalStore = nullptr;
+
+        //CertGetCertificateChain searches by default in MY, CA, ROOT and TRUST
+        bChain = CertGetCertificateChain(
+            nullptr ,
+            pCertContext ,
+            nullptr , //use current system time
+            hAdditionalStore,
+            &chainPara ,
+            CERT_CHAIN_REVOCATION_CHECK_CHAIN | CERT_CHAIN_TIMESTAMP_TIME ,
+            nullptr ,
+            &pChainContext);
+        if (!bChain)
+            pChainContext = nullptr;
+
+        //Close the additional store
+        CertCloseStore(hCollectionStore, CERT_CLOSE_STORE_CHECK_FLAG);
+    }
+
+    if(bChain &&  pChainContext != nullptr && pChainContext->cChain > 0 )
+    {
+        PCCERT_CONTEXT pCertInChain ;
+        PCERT_SIMPLE_CHAIN pCertChain ;
+        X509Certificate_MSCryptImpl* pCert ;
+
+        pCertChain = pChainContext->rgpChain[0] ;
+        if( pCertChain->cElement ) {
+            uno::Sequence< uno::Reference< XCertificate > > xCertChain( pCertChain->cElement ) ;
+
+            for( unsigned int i = 0 ; i < pCertChain->cElement ; i ++ ) {
+                if( pCertChain->rgpElement[i] )
+                    pCertInChain = pCertChain->rgpElement[i]->pCertContext ;
+                else
+                    pCertInChain = nullptr ;
+
+                if( pCertInChain != nullptr ) {
+                    pCert = MswcryCertContextToXCert( pCertInChain ) ;
+                    if( pCert != nullptr )
+                        xCertChain[i] = pCert ;
+                }
+            }
+
+            CertFreeCertificateChain( pChainContext ) ;
+            pChainContext = nullptr ;
+
+            return xCertChain ;
+        }
+    }
+    if (pChainContext)
+        CertFreeCertificateChain(pChainContext);
+
+    return uno::Sequence< uno::Reference < XCertificate > >();
+}
+
+uno::Reference< XCertificate > SecurityEnvironment_MSCryptImpl::createCertificateFromRaw( const uno::Sequence< sal_Int8 >& rawCertificate ) {
+    X509Certificate_MSCryptImpl* xcert ;
+
+    if( rawCertificate.getLength() > 0 ) {
+        xcert = new X509Certificate_MSCryptImpl() ;
+        xcert->setRawCert( rawCertificate ) ;
+    } else {
+        xcert = nullptr ;
+    }
+
+    return xcert ;
+}
+
+uno::Reference< XCertificate > SecurityEnvironment_MSCryptImpl::createCertificateFromAscii( const OUString& asciiCertificate ) {
+
+    OString oscert = OUStringToOString( asciiCertificate , RTL_TEXTENCODING_ASCII_US ) ;
+
+    xmlChar* chCert = xmlStrndup( reinterpret_cast<const xmlChar*>(oscert.getStr()), static_cast<int>(oscert.getLength()) ) ;
+
+    xmlSecSize certSize = xmlSecBase64Decode( chCert, chCert, xmlStrlen( chCert ) ) ;
+
+    uno::Sequence< sal_Int8 > rawCert( certSize ) ;
+    for( xmlSecSize i = 0 ; i < certSize ; i ++ )
+        rawCert[i] = *( chCert + i ) ;
+
+    xmlFree( chCert ) ;
+
+    return createCertificateFromRaw( rawCert ) ;
+}
+
+
+static HCERTSTORE getCertStoreForIntermediatCerts(
+    const uno::Sequence< uno::Reference< css::security::XCertificate > >& seqCerts)
+{
+    HCERTSTORE store = CertOpenStore(CERT_STORE_PROV_MEMORY, 0, NULL, 0, nullptr);
+    if (store == nullptr)
+        return nullptr;
+
+    for (int i = 0; i < seqCerts.getLength(); i++)
+    {
+        SAL_INFO("xmlsecurity.xmlsec", "Added temporary certificate: " << seqCerts[i]->getSubjectName());
+
+        uno::Sequence<sal_Int8> data = seqCerts[i]->getEncoded();
+        PCCERT_CONTEXT cert = CertCreateCertificateContext(
+            X509_ASN_ENCODING, reinterpret_cast<const BYTE*>(&data[0]), data.getLength());
+        //Adding the certificate creates a copy and not just increases the ref count
+        //Therefore we free later the certificate that we now add
+        CertAddCertificateContextToStore(store, cert, CERT_STORE_ADD_ALWAYS, nullptr);
+        CertFreeCertificateContext(cert);
+    }
+    return store;
+}
+
+//We return only valid or invalid, as long as the API documentation expresses
+//explicitly that all validation steps are carried out even if one or several
+//errors occur. See also
+//http://wiki.openoffice.org/wiki/Certificate_Path_Validation#Validation_status
+sal_Int32 SecurityEnvironment_MSCryptImpl::verifyCertificate(
+    const uno::Reference< css::security::XCertificate >& aCert,
+    const uno::Sequence< uno::Reference< css::security::XCertificate > >& seqCerts)
+{
+    sal_Int32 validity = 0;
+    PCCERT_CHAIN_CONTEXT pChainContext = nullptr;
+    PCCERT_CONTEXT pCertContext = nullptr;
+
+    uno::Reference< XUnoTunnel > xCertTunnel( aCert, uno::UNO_QUERY_THROW ) ;
+
+    SAL_INFO("xmlsecurity.xmlsec", "Start verification of certificate: " << aCert->getSubjectName());
+
+    auto xcert = reinterpret_cast<const X509Certificate_MSCryptImpl*>
+            (xCertTunnel->getSomething( X509Certificate_MSCryptImpl::getUnoTunnelId() ));
+    if( xcert == nullptr ) {
+        throw uno::RuntimeException() ;
+    }
+
+    pCertContext = xcert->getMswcryCert() ;
+
+    CERT_ENHKEY_USAGE   enhKeyUsage ;
+    CERT_USAGE_MATCH    certUsage ;
+    CERT_CHAIN_PARA     chainPara = {};
+
+    //Prepare parameter for CertGetCertificateChain
+    enhKeyUsage.cUsageIdentifier = 0 ;
+    enhKeyUsage.rgpszUsageIdentifier = nullptr ;
+    certUsage.dwType = USAGE_MATCH_TYPE_AND ;
+    certUsage.Usage = enhKeyUsage ;
+    chainPara.cbSize = sizeof( CERT_CHAIN_PARA ) ;
+    chainPara.RequestedUsage = certUsage ;
+
+
+    HCERTSTORE hCollectionStore = nullptr;
+    HCERTSTORE hIntermediateCertsStore = nullptr;
+    bool bChain = false;
+    if( pCertContext != nullptr )
+    {
+        hIntermediateCertsStore =
+            getCertStoreForIntermediatCerts(seqCerts);
+
+        //Merge m_hCertStore and m_hKeyStore and the store of the intermediate
+        //certificates into one store.
+        hCollectionStore = CertOpenStore(
+            CERT_STORE_PROV_COLLECTION ,
+            0 ,
+            NULL ,
+            0 ,
+            nullptr
+            ) ;
+        if (hCollectionStore != nullptr)
+        {
+            CertAddStoreToCollection (
+                hCollectionStore ,
+                m_hCertStore ,
+                CERT_PHYSICAL_STORE_ADD_ENABLE_FLAG ,
+                0) ;
+            CertAddStoreToCollection (
+                hCollectionStore ,
+                m_hCertStore ,
+                CERT_PHYSICAL_STORE_ADD_ENABLE_FLAG ,
+                0) ;
+            CertAddStoreToCollection (
+                hCollectionStore,
+                hIntermediateCertsStore,
+                CERT_PHYSICAL_STORE_ADD_ENABLE_FLAG,
+                0);
+
+        }
+
+        //CertGetCertificateChain searches by default in MY, CA, ROOT and TRUST
+        //We do not check revocation of the root. In most cases there are none.
+        //Then we would get CERT_TRUST_REVOCATION_STATUS_UNKNOWN
+        SAL_INFO("xmlsecurity.xmlsec", "Verifying cert using revocation information.");
+        bChain = CertGetCertificateChain(
+            nullptr ,
+            pCertContext ,
+            nullptr , //use current system time
+            hCollectionStore,
+            &chainPara ,
+            CERT_CHAIN_REVOCATION_CHECK_CHAIN | CERT_CHAIN_REVOCATION_CHECK_CHAIN_EXCLUDE_ROOT,
+            nullptr ,
+            &pChainContext);
+
+        if (bChain && pChainContext->cChain > 0)
+        {
+            SAL_INFO("xmlsecurity.xmlsec", "Overall error status (all chains):");
+            traceTrustStatus(pChainContext->TrustStatus.dwErrorStatus);
+            //highest quality chains come first
+            PCERT_SIMPLE_CHAIN pSimpleChain = pChainContext->rgpChain[0];
+            SAL_INFO("xmlsecurity.xmlsec", "Error status of first chain:");
+            traceTrustStatus(pSimpleChain->TrustStatus.dwErrorStatus);
+
+            //CERT_TRUST_REVOCATION_STATUS_UNKNOWN is also set if a certificate
+            //has no AIA(OCSP) or CRLDP extension and there is no CRL locally installed.
+            DWORD revocationFlags = CERT_TRUST_REVOCATION_STATUS_UNKNOWN |
+                CERT_TRUST_IS_OFFLINE_REVOCATION;
+            DWORD otherErrorsMask = ~revocationFlags;
+            if( !(pSimpleChain->TrustStatus.dwErrorStatus & otherErrorsMask))
+
+            {
+                //No errors except maybe those caused by missing revocation information
+                //Check if there are errors
+                if ( pSimpleChain->TrustStatus.dwErrorStatus & revocationFlags)
+                {
+                    //No revocation information. Because MSDN documentation is not
+                    //clear about if all other tests are performed if an error occurs,
+                    //we test again, without requiring revocation checking.
+                    CertFreeCertificateChain(pChainContext);
+                    pChainContext = nullptr;
+                    SAL_INFO("xmlsecurity.xmlsec", "Checking again but without requiring revocation information.");
+                    bChain = CertGetCertificateChain(
+                        nullptr ,
+                        pCertContext ,
+                        nullptr , //use current system time
+                        hCollectionStore,
+                        &chainPara ,
+                        0,
+                        nullptr ,
+                        &pChainContext);
+                    if (bChain
+                        && pChainContext->cChain > 0
+                        && pChainContext->rgpChain[0]->TrustStatus.dwErrorStatus == CERT_TRUST_NO_ERROR)
+                    {
+                        SAL_INFO("xmlsecurity.xmlsec", "Certificate is valid.");
+                        validity = css::security::CertificateValidity::VALID;
+                    }
+                    else
+                    {
+                        SAL_INFO("xmlsecurity.xmlsec", "Certificate is invalid.");
+                    }
+                }
+                else
+                {
+                    //valid and revocation information available
+                    SAL_INFO("xmlsecurity.xmlsec", "Certificate is valid.");
+                    validity = css::security::CertificateValidity::VALID;
+                }
+            }
+            else
+            {
+                //invalid
+                SAL_INFO("xmlsecurity.xmlsec", "Certificate is invalid.");
+                validity = css::security::CertificateValidity::INVALID ;
+            }
+        }
+        else
+        {
+            SAL_INFO("xmlsecurity.xmlsec", "CertGetCertificateChaine failed.");
+        }
+    }
+
+    if (pChainContext)
+    {
+        CertFreeCertificateChain(pChainContext);
+        pChainContext = nullptr;
+    }
+
+    //Close the additional store, do not destroy the contained certs
+    CertCloseStore(hCollectionStore, CERT_CLOSE_STORE_CHECK_FLAG);
+    //Close the temporary store containing the intermediate certificates and make
+    //sure all certificates are deleted.
+    CertCloseStore(hIntermediateCertsStore, CERT_CLOSE_STORE_CHECK_FLAG);
+
+    return validity ;
+}
+
+sal_Int32 SecurityEnvironment_MSCryptImpl::getCertificateCharacters( const css::uno::Reference< css::security::XCertificate >& aCert ) {
+    sal_Int32 characters ;
+    PCCERT_CONTEXT pCertContext ;
+    const X509Certificate_MSCryptImpl* xcert ;
+
+    uno::Reference< XUnoTunnel > xCertTunnel( aCert, uno::UNO_QUERY_THROW ) ;
+    xcert = reinterpret_cast<X509Certificate_MSCryptImpl*>(xCertTunnel->getSomething( X509Certificate_MSCryptImpl::getUnoTunnelId() ));
+    if( xcert == nullptr ) {
+        throw uno::RuntimeException() ;
+    }
+
+    pCertContext = xcert->getMswcryCert() ;
+
+    characters = 0x00000000 ;
+
+    //Firstly, make sentence whether or not the cert is self-signed.
+    if( CertCompareCertificateName( X509_ASN_ENCODING | PKCS_7_ASN_ENCODING, &(pCertContext->pCertInfo->Subject), &(pCertContext->pCertInfo->Issuer) ) ) {
+        characters |= css::security::CertificateCharacters::SELF_SIGNED ;
+    } else {
+        characters &= ~ css::security::CertificateCharacters::SELF_SIGNED ;
+    }
+
+    //Secondly, make sentence whether or not the cert has a private key.
+    {
+        BOOL    fCallerFreeProv ;
+        DWORD   dwKeySpec ;
+        NCRYPT_KEY_HANDLE hKey = 0;
+        DWORD dwFlags = CRYPT_ACQUIRE_ONLY_NCRYPT_KEY_FLAG;
+        HCRYPTPROV_OR_NCRYPT_KEY_HANDLE* phCryptProvOrNCryptKey = &hKey;
+        if( CryptAcquireCertificatePrivateKey( pCertContext ,
+                   dwFlags,
+                   nullptr ,
+                   phCryptProvOrNCryptKey,
+                   &dwKeySpec,
+                   &fCallerFreeProv )
+        ) {
+            characters |=  css::security::CertificateCharacters::HAS_PRIVATE_KEY ;
+
+            if (hKey && fCallerFreeProv)
+                NCryptFreeObject(hKey);
+        } else {
+            characters &= ~ css::security::CertificateCharacters::HAS_PRIVATE_KEY ;
+        }
+    }
+    return characters ;
+}
+
+void SecurityEnvironment_MSCryptImpl::enableDefaultCrypt( bool enable ) {
+    m_bEnableDefault = enable ;
+}
+
+bool SecurityEnvironment_MSCryptImpl::defaultEnabled() {
+    return m_bEnableDefault ;
+}
+
+static X509Certificate_MSCryptImpl* MswcryCertContextToXCert( PCCERT_CONTEXT cert )
+{
+    X509Certificate_MSCryptImpl* xcert ;
+
+    if( cert != nullptr ) {
+        xcert = new X509Certificate_MSCryptImpl() ;
+        xcert->setMswcryCert( cert ) ;
+    } else {
+        xcert = nullptr ;
+    }
+
+    return xcert ;
+}
+
+OUString SecurityEnvironment_MSCryptImpl::getSecurityEnvironmentInformation()
+{
+    return "Microsoft Crypto API";
+}
+
+xmlSecKeysMngrPtr SecurityEnvironment_MSCryptImpl::createKeysManager() {
+
+    /*-
+     * The following lines is based on the of xmlsec-mscrypto crypto engine
+     */
+    xmlSecKeysMngrPtr pKeysMngr = xmlsecurity::MSCryptoAppliedKeysMngrCreate() ;
+    if( pKeysMngr == nullptr )
+        throw uno::RuntimeException() ;
+
+    /*-
+     * Adopt system default certificate store.
+     */
+    if( defaultEnabled() ) {
+        //Add system key store into the keys manager.
+        m_hMySystemStore = CertOpenSystemStoreW( 0, L"MY" ) ;
+        if( m_hMySystemStore != nullptr ) {
+            if( xmlsecurity::MSCryptoAppliedKeysMngrAdoptKeyStore( pKeysMngr, m_hMySystemStore ) < 0 ) {
+                CertCloseStore( m_hMySystemStore, CERT_CLOSE_STORE_CHECK_FLAG ) ;
+                m_hMySystemStore = nullptr;
+                throw uno::RuntimeException() ;
+            }
+            m_hMySystemStore = nullptr;
+        }
+
+        //Add system root store into the keys manager.
+        m_hRootSystemStore = CertOpenSystemStoreW( 0, L"Root" ) ;
+        if( m_hRootSystemStore != nullptr ) {
+            if( xmlsecurity::MSCryptoAppliedKeysMngrAdoptTrustedStore( pKeysMngr, m_hRootSystemStore ) < 0 ) {
+                CertCloseStore( m_hRootSystemStore, CERT_CLOSE_STORE_CHECK_FLAG ) ;
+                m_hRootSystemStore = nullptr;
+                throw uno::RuntimeException() ;
+            }
+            m_hRootSystemStore = nullptr;
+        }
+
+        //Add system trusted store into the keys manager.
+        m_hTrustSystemStore = CertOpenSystemStoreW( 0, L"Trust" ) ;
+        if( m_hTrustSystemStore != nullptr ) {
+            if( xmlsecurity::MSCryptoAppliedKeysMngrAdoptUntrustedStore( pKeysMngr, m_hTrustSystemStore ) < 0 ) {
+                CertCloseStore( m_hTrustSystemStore, CERT_CLOSE_STORE_CHECK_FLAG ) ;
+                m_hTrustSystemStore = nullptr;
+                throw uno::RuntimeException() ;
+            }
+            m_hTrustSystemStore = nullptr;
+        }
+
+        //Add system CA store into the keys manager.
+        m_hCaSystemStore = CertOpenSystemStoreW( 0, L"CA" ) ;
+        if( m_hCaSystemStore != nullptr ) {
+            if( xmlsecurity::MSCryptoAppliedKeysMngrAdoptUntrustedStore( pKeysMngr, m_hCaSystemStore ) < 0 ) {
+                CertCloseStore( m_hCaSystemStore, CERT_CLOSE_STORE_CHECK_FLAG ) ;
+                m_hCaSystemStore = nullptr;
+                throw uno::RuntimeException() ;
+            }
+            m_hCaSystemStore = nullptr;
+        }
+    }
+
+    return pKeysMngr ;
+}
+void SecurityEnvironment_MSCryptImpl::destroyKeysManager(xmlSecKeysMngrPtr pKeysMngr) {
+    if( pKeysMngr != nullptr ) {
+        xmlSecKeysMngrDestroy( pKeysMngr ) ;
+    }
+}
+
+extern "C" SAL_DLLPUBLIC_EXPORT uno::XInterface*
+com_sun_star_xml_crypto_SecurityEnvironment_get_implementation(
+    uno::XComponentContext* pCtx, uno::Sequence<uno::Any> const& /*rSeq*/)
+{
+    return cppu::acquire(new SecurityEnvironment_MSCryptImpl(pCtx));
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/xmlsec/mscrypt/securityenvironment_mscryptimpl.hxx b/xmlsecurity/source/xmlsec/mscrypt/securityenvironment_mscryptimpl.hxx
new file mode 100644
index 000000000..7064cda13
--- /dev/null
+++ b/xmlsecurity/source/xmlsec/mscrypt/securityenvironment_mscryptimpl.hxx
@@ -0,0 +1,176 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#ifndef INCLUDED_XMLSECURITY_SOURCE_XMLSEC_MSCRYPT_SECURITYENVIRONMENT_MSCRYPTIMPL_HXX
+#define INCLUDED_XMLSECURITY_SOURCE_XMLSEC_MSCRYPT_SECURITYENVIRONMENT_MSCRYPTIMPL_HXX
+
+#if !defined WIN32_LEAN_AND_MEAN
+# define WIN32_LEAN_AND_MEAN
+#endif
+#include <windows.h>
+#include <wincrypt.h>
+#include <sal/config.h>
+#include <rtl/ustring.hxx>
+#include <comphelper/servicehelper.hxx>
+#include <cppuhelper/factory.hxx>
+#include <cppuhelper/implbase.hxx>
+#include <com/sun/star/uno/Exception.hpp>
+
+#include <com/sun/star/uno/Reference.hxx>
+#include <com/sun/star/lang/XSingleServiceFactory.hpp>
+
+#include <com/sun/star/lang/XServiceInfo.hpp>
+#include <com/sun/star/xml/crypto/XSecurityEnvironment.hpp>
+#include <com/sun/star/security/XCertificate.hpp>
+#include <com/sun/star/security/CertificateCharacters.hpp>
+#include <com/sun/star/security/CertificateValidity.hpp>
+#include <com/sun/star/lang/XUnoTunnel.hpp>
+
+#include <vector>
+#include <xmlsec-wrapper.h>
+
+#include <sal/types.h>
+
+
+class SecurityEnvironment_MSCryptImpl : public ::cppu::WeakImplHelper<
+    css::xml::crypto::XSecurityEnvironment ,
+    css::lang::XServiceInfo,
+    css::lang::XUnoTunnel >
+{
+    private:
+        //crypto provider and key container
+        HCRYPTPROV                          m_hProv ;
+        LPCTSTR                             m_pszContainer ;
+
+        //Key store
+        HCERTSTORE                          m_hKeyStore ;
+
+        //Certificate store
+        HCERTSTORE                          m_hCertStore ;
+
+        // i120675, save the store handles
+        HCERTSTORE                          m_hMySystemStore;
+        HCERTSTORE                          m_hRootSystemStore;
+        HCERTSTORE                          m_hTrustSystemStore;
+        HCERTSTORE                          m_hCaSystemStore;
+
+        //Enable default system cryptography setting
+        bool                                m_bEnableDefault ;
+
+        //Service manager
+        css::uno::Reference< css::lang::XMultiServiceFactory > m_xServiceManager ;
+
+    public:
+        explicit SecurityEnvironment_MSCryptImpl( const css::uno::Reference< css::uno::XComponentContext >& xContext ) ;
+        virtual ~SecurityEnvironment_MSCryptImpl() override;
+
+        //Methods from XSecurityEnvironment
+        virtual css::uno::Sequence< css::uno::Reference< css::security::XCertificate > > SAL_CALL getPersonalCertificates() override;
+        virtual css::uno::Sequence< css::uno::Reference< css::security::XCertificate > > SAL_CALL getAllCertificates() override
+        { return css::uno::Sequence< css::uno::Reference< css::security::XCertificate > >(); }
+
+        virtual css::uno::Reference< css::security::XCertificate > SAL_CALL getCertificate(
+            const OUString& issuerName,
+            const css::uno::Sequence< sal_Int8 >& serialNumber ) override;
+
+        /// @throws css::uno::SecurityException
+        /// @throws css::uno::RuntimeException
+        virtual css::uno::Reference< css::security::XCertificate > getCertificate(
+            const OUString& issuerName,
+            const OUString& serialNumber ) ;
+
+        virtual css::uno::Sequence< css::uno::Reference< css::security::XCertificate > > SAL_CALL buildCertificatePath(
+            const css::uno::Reference< css::security::XCertificate >& beginCert ) override;
+
+        virtual css::uno::Reference< css::security::XCertificate > SAL_CALL createCertificateFromRaw(
+            const css::uno::Sequence< sal_Int8 >& rawCertificate ) override;
+
+        virtual css::uno::Reference< css::security::XCertificate > SAL_CALL createCertificateFromAscii(
+            const OUString& asciiCertificate ) override;
+
+        virtual ::sal_Int32 SAL_CALL verifyCertificate(
+            const css::uno::Reference< css::security::XCertificate >& xCert,
+            const css::uno::Sequence< css::uno::Reference<
+            css::security::XCertificate > >& intermediateCertificates) override;
+
+        virtual ::sal_Int32 SAL_CALL getCertificateCharacters(
+            const css::uno::Reference< css::security::XCertificate >& xCert ) override;
+
+        virtual OUString SAL_CALL getSecurityEnvironmentInformation(  ) override;
+
+
+        //Methods from XServiceInfo
+        virtual OUString SAL_CALL getImplementationName() override;
+
+        virtual sal_Bool SAL_CALL supportsService(
+            const OUString& ServiceName
+        ) override;
+
+        virtual css::uno::Sequence< OUString > SAL_CALL getSupportedServiceNames() override;
+
+        //Methods from XUnoTunnel
+        UNO3_GETIMPLEMENTATION_DECL(SecurityEnvironment_MSCryptImpl)
+
+        /// @throws css::uno::Exception
+        /// @throws css::uno::RuntimeException
+        HCRYPTPROV getCryptoProvider() ;
+        /// @throws css::uno::Exception
+        /// @throws css::uno::RuntimeException
+        void setCryptoProvider( HCRYPTPROV aProv ) ;
+
+        /// @throws css::uno::Exception
+        /// @throws css::uno::RuntimeException
+        LPCTSTR getKeyContainer() ;
+        /// @throws css::uno::Exception
+        /// @throws css::uno::RuntimeException
+        void setKeyContainer( LPCTSTR aKeyContainer ) ;
+
+        /// @throws css::uno::Exception
+        /// @throws css::uno::RuntimeException
+        HCERTSTORE getCryptoSlot() ;
+        /// @throws css::uno::Exception
+        /// @throws css::uno::RuntimeException
+        void setCryptoSlot( HCERTSTORE aKeyStore ) ;
+
+        /// @throws css::uno::Exception
+        /// @throws css::uno::RuntimeException
+        HCERTSTORE getCertDb() ;
+        /// @throws css::uno::Exception
+        /// @throws css::uno::RuntimeException
+        void setCertDb( HCERTSTORE aCertDb ) ;
+
+        /// @throws css::uno::Exception
+        /// @throws css::uno::RuntimeException
+        void enableDefaultCrypt( bool enable ) ;
+        /// @throws css::uno::Exception
+        /// @throws css::uno::RuntimeException
+        bool defaultEnabled() ;
+
+        /// @throws css::uno::Exception
+        /// @throws css::uno::RuntimeException
+        xmlSecKeysMngrPtr createKeysManager() ;
+
+        /// @throws css::uno::Exception
+        /// @throws css::uno::RuntimeException
+        static void destroyKeysManager(xmlSecKeysMngrPtr pKeysMngr) ;
+} ;
+
+#endif // INCLUDED_XMLSECURITY_SOURCE_XMLSEC_MSCRYPT_SECURITYENVIRONMENT_MSCRYPTIMPL_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/xmlsec/mscrypt/seinitializer_mscryptimpl.cxx b/xmlsecurity/source/xmlsec/mscrypt/seinitializer_mscryptimpl.cxx
new file mode 100644
index 000000000..00b6e12f7
--- /dev/null
+++ b/xmlsecurity/source/xmlsec/mscrypt/seinitializer_mscryptimpl.cxx
@@ -0,0 +1,175 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <sal/config.h>
+#include <xmlsec-wrapper.h>
+
+#include "seinitializer_mscryptimpl.hxx"
+
+#include "securityenvironment_mscryptimpl.hxx"
+
+#include <xmlsec/mscng/app.h>
+#include <com/sun/star/xml/crypto/SecurityEnvironment.hpp>
+#include <com/sun/star/xml/crypto/XMLSecurityContext.hpp>
+#include <cppuhelper/supportsservice.hxx>
+#include <o3tl/char16_t2wchar_t.hxx>
+#include <svl/cryptosign.hxx>
+
+using namespace com::sun::star;
+namespace cssl = com::sun::star::lang;
+namespace cssxc = com::sun::star::xml::crypto;
+
+SEInitializer_MSCryptImpl::SEInitializer_MSCryptImpl(
+    const uno::Reference< uno::XComponentContext > &rxContext)
+    :mxContext( rxContext )
+{
+}
+
+SEInitializer_MSCryptImpl::~SEInitializer_MSCryptImpl()
+{
+}
+
+/* XSEInitializer */
+uno::Reference< cssxc::XXMLSecurityContext > SAL_CALL
+    SEInitializer_MSCryptImpl::createSecurityContext(
+    const OUString& sCertDB )
+{
+    const char* n_pCertStore ;
+    HCERTSTORE  n_hStoreHandle ;
+    OString sCertDir;
+
+    //Initialize the crypto engine
+    if( sCertDB.getLength() > 0 )
+    {
+        sCertDir = OString(sCertDB.getStr(), sCertDB.getLength(), RTL_TEXTENCODING_ASCII_US);
+        n_pCertStore = sCertDir.getStr();
+        n_hStoreHandle = CertOpenSystemStoreW( NULL, o3tl::toW(sCertDB.getStr())) ;
+        if( n_hStoreHandle == nullptr )
+        {
+            return nullptr;
+        }
+    }
+    else
+    {
+        n_pCertStore = nullptr ;
+        n_hStoreHandle = nullptr ;
+    }
+
+    xmlSecMSCngAppInit(n_pCertStore);
+
+    try {
+        /* Build Security Environment */
+        uno::Reference< cssxc::XSecurityEnvironment > xSecEnv = cssxc::SecurityEnvironment::create( mxContext );
+
+        /* Setup key slot and certDb */
+        uno::Reference< cssl::XUnoTunnel > xSecEnvTunnel( xSecEnv, uno::UNO_QUERY_THROW );
+        SecurityEnvironment_MSCryptImpl* pSecEnv = reinterpret_cast<SecurityEnvironment_MSCryptImpl*>(xSecEnvTunnel->getSomething( SecurityEnvironment_MSCryptImpl::getUnoTunnelId() ));
+        if( pSecEnv == nullptr )
+        {
+            if( n_hStoreHandle != nullptr )
+            {
+                CertCloseStore( n_hStoreHandle, CERT_CLOSE_STORE_FORCE_FLAG ) ;
+            }
+
+            xmlSecMSCngAppShutdown();
+            return nullptr;
+        }
+
+        if( n_hStoreHandle != nullptr )
+        {
+            pSecEnv->setCryptoSlot( n_hStoreHandle ) ;
+            pSecEnv->setCertDb( n_hStoreHandle ) ;
+        }
+        else
+        {
+            pSecEnv->enableDefaultCrypt( true ) ;
+        }
+
+        /* Build XML Security Context */
+        uno::Reference< cssxc::XXMLSecurityContext > xSecCtx = cssxc::XMLSecurityContext::create( mxContext );
+
+        xSecCtx->setDefaultSecurityEnvironmentIndex(xSecCtx->addSecurityEnvironment( xSecEnv )) ;
+        return xSecCtx;
+    }
+    catch( uno::Exception& )
+    {
+        if( n_hStoreHandle != nullptr )
+        {
+            CertCloseStore( n_hStoreHandle, CERT_CLOSE_STORE_FORCE_FLAG ) ;
+        }
+
+        xmlSecMSCngAppShutdown();
+        return nullptr;
+    }
+}
+
+void SAL_CALL SEInitializer_MSCryptImpl::freeSecurityContext( const uno::Reference< cssxc::XXMLSecurityContext >&)
+{
+    /*
+    uno::Reference< cssxc::XSecurityEnvironment > xSecEnv
+        = securityContext->getSecurityEnvironment();
+
+    if( xSecEnv.is() )
+    {
+        uno::Reference< cssl::XUnoTunnel > xEnvTunnel( xSecEnv , uno::UNO_QUERY ) ;
+        if( xEnvTunnel.is() )
+        {
+            SecurityEnvironment_MSCryptImpl* pSecEnv = ( SecurityEnvironment_MSCryptImpl* )xEnvTunnel->getSomething( SecurityEnvironment_MSCryptImpl::getUnoTunnelId() ) ;
+            HCERTSTORE n_hStoreHandle = pSecEnv->getCryptoSlot();
+
+            if( n_hStoreHandle != NULL )
+            {
+                CertCloseStore( n_hStoreHandle, CERT_CLOSE_STORE_FORCE_FLAG ) ;
+                pSecEnv->setCryptoSlot( NULL ) ;
+                pSecEnv->setCertDb( NULL ) ;
+            }
+
+            xmlSecMSCryptoAppShutdown() ;
+        }
+    }
+    */
+
+    xmlSecMSCngAppShutdown();
+}
+
+/* XServiceInfo */
+OUString SAL_CALL SEInitializer_MSCryptImpl::getImplementationName()
+{
+    return "com.sun.star.xml.crypto.SEInitializer";
+}
+
+sal_Bool SAL_CALL SEInitializer_MSCryptImpl::supportsService( const OUString& rServiceName )
+{
+    return cppu::supportsService( this, rServiceName );
+}
+
+uno::Sequence< OUString > SAL_CALL SEInitializer_MSCryptImpl::getSupportedServiceNames()
+{
+    uno::Sequence<OUString> aRet { "com.sun.star.xml.crypto.SEInitializer" };
+    return aRet;
+}
+
+extern "C" SAL_DLLPUBLIC_EXPORT uno::XInterface*
+com_sun_star_xml_crypto_SEInitializer_get_implementation(
+    uno::XComponentContext* pCtx, uno::Sequence<uno::Any> const& /*rSeq*/)
+{
+    return cppu::acquire(new SEInitializer_MSCryptImpl(pCtx));
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/xmlsec/mscrypt/seinitializer_mscryptimpl.hxx b/xmlsecurity/source/xmlsec/mscrypt/seinitializer_mscryptimpl.hxx
new file mode 100644
index 000000000..145124a97
--- /dev/null
+++ b/xmlsecurity/source/xmlsec/mscrypt/seinitializer_mscryptimpl.hxx
@@ -0,0 +1,74 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#ifndef INCLUDED_XMLSECURITY_SOURCE_XMLSEC_MSCRYPT_SEINITIALIZER_MSCRYPTIMPL_HXX
+#define INCLUDED_XMLSECURITY_SOURCE_XMLSEC_MSCRYPT_SEINITIALIZER_MSCRYPTIMPL_HXX
+
+#include <com/sun/star/xml/crypto/XXMLSecurityContext.hpp>
+#include <com/sun/star/xml/crypto/XSEInitializer.hpp>
+#include <com/sun/star/lang/XUnoTunnel.hpp>
+#include <com/sun/star/lang/XServiceInfo.hpp>
+#include <com/sun/star/lang/XMultiServiceFactory.hpp>
+#include <com/sun/star/uno/XComponentContext.hpp>
+#include <cppuhelper/implbase.hxx>
+
+#include <libxml/tree.h>
+
+class SEInitializer_MSCryptImpl : public cppu::WeakImplHelper
+<
+    css::xml::crypto::XSEInitializer,
+    css::lang::XServiceInfo
+>
+/****** SEInitializer_MSCryptImpl.hxx/CLASS SEInitializer_MSCryptImpl ***********
+ *
+ *   NAME
+ *  SEInitializer_MSCryptImpl -- Class to initialize a Security Context
+ *  instance
+ *
+ *   FUNCTION
+ *  Use this class to initialize a XmlSec based Security Context
+ *  instance. After this instance is used up, use this class to free this
+ *  instance.
+ ******************************************************************************/
+{
+private:
+    css::uno::Reference< css::uno::XComponentContext > mxContext;
+
+public:
+    explicit SEInitializer_MSCryptImpl(const css::uno::Reference< css::uno::XComponentContext > &rxContext);
+    virtual ~SEInitializer_MSCryptImpl() override;
+
+    /* XSEInitializer */
+    virtual css::uno::Reference< css::xml::crypto::XXMLSecurityContext >
+        SAL_CALL createSecurityContext( const OUString& certDB ) override;
+
+    virtual void SAL_CALL freeSecurityContext( const css::uno::Reference<
+        css::xml::crypto::XXMLSecurityContext >& securityContext ) override;
+
+    /* XServiceInfo */
+    virtual OUString SAL_CALL getImplementationName(  ) override;
+
+    virtual sal_Bool SAL_CALL supportsService( const OUString& ServiceName ) override;
+
+    virtual css::uno::Sequence< OUString > SAL_CALL getSupportedServiceNames(  ) override;
+};
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/xmlsec/mscrypt/x509certificate_mscryptimpl.cxx b/xmlsecurity/source/xmlsec/mscrypt/x509certificate_mscryptimpl.cxx
new file mode 100644
index 000000000..0e619b280
--- /dev/null
+++ b/xmlsecurity/source/xmlsec/mscrypt/x509certificate_mscryptimpl.cxx
@@ -0,0 +1,652 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <string.h>
+
+#include <sal/config.h>
+#include <sal/log.hxx>
+#include <comphelper/servicehelper.hxx>
+#include <comphelper/windowserrorstring.hxx>
+#include <cppuhelper/supportsservice.hxx>
+#include "x509certificate_mscryptimpl.hxx"
+#include <certificateextension_xmlsecimpl.hxx>
+#include "sanextension_mscryptimpl.hxx"
+
+#include "oid.hxx"
+
+#include <rtl/locale.h>
+#include <osl/nlsupport.h>
+#include <osl/process.h>
+#include <o3tl/char16_t2wchar_t.hxx>
+
+#include <memory>
+#include <utility>
+#include <vector>
+#include <tools/time.hxx>
+#include <svl/sigstruct.hxx>
+
+using namespace com::sun::star;
+using namespace ::com::sun::star::uno ;
+using namespace ::com::sun::star::security ;
+
+using ::com::sun::star::security::XCertificate ;
+using ::com::sun::star::util::DateTime ;
+
+/*Returns the index within rRawString where sTypeName starts and where it ends.
+    The starting index is pair.first. The ending index in pair.second points
+    one char after the last character of the type.
+    sTypeName can be
+    "S" or "CN" (without ""). Do not use spaces at the beginning of the type name.
+    If the type name is not found then pair.first and pair.second are -1.
+*/
+static std::pair< sal_Int32, sal_Int32 >
+findTypeInDN(const OUString& rRawString, const OUString& sTypeName)
+{
+    std::pair< sal_Int32, sal_Int32 > retVal;
+    bool bInEscape = false;
+    bool bInValue = false;
+    bool bFound = false;
+    sal_Int32 nTypeNameStart = 0;
+    sal_Int32 length = rRawString.getLength();
+
+    for (sal_Int32 i = 0; i < length; i++)
+    {
+        sal_Unicode c = rRawString[i];
+
+        if (c == '=')
+        {
+            if (! bInValue)
+            {
+                OUString sType = rRawString.copy(nTypeNameStart, i - nTypeNameStart);
+                sType = sType.trim();
+                if (sType.equalsIgnoreAsciiCase(sTypeName))
+                {
+                    bFound = true;
+                    break;
+                }
+            }
+        }
+        else if (c == '"')
+        {
+            if (!bInEscape)
+            {
+                //If this is the quote is the first of the couple which enclose the
+                //whole value, because the value contains special characters
+                //then we just drop it. That is, this character must be followed by
+                //a character which is not '"'.
+                if ( i + 1 < length && rRawString[i+1] == '"')
+                    bInEscape = true;
+                else
+                    bInValue = !bInValue; //value is enclosed in " "
+            }
+            else
+            {
+                //This quote is escaped by a preceding quote and therefore is
+                //part of the value
+                bInEscape = false;
+            }
+        }
+        else if (c == ',' || c == '+')
+        {
+            //The comma separate the attribute value pairs.
+            //If the comma is not part of a value (the value would then be enclosed in '"'),
+            //then we have reached the end of the value
+            if (!bInValue)
+            {
+                //The next char is the start of the new type
+                nTypeNameStart = i + 1;
+            }
+        }
+    }
+
+    //Found the Type Name, but there can still be spaces after the last comma
+    //and the beginning of the type.
+    if (bFound)
+    {
+        while (true)
+        {
+            sal_Unicode c = rRawString[nTypeNameStart];
+            if (c != ' ' && c != '\t')
+                //found
+                break;
+            nTypeNameStart ++;
+        }
+        // search end (one after last letter)
+        sal_Int32 nTypeNameEnd = nTypeNameStart;
+        nTypeNameEnd++;
+        while (true)
+        {
+             sal_Unicode c = rRawString[nTypeNameEnd];
+             if (c == ' ' || c == '\t' || c == '=')
+                 break;
+             nTypeNameEnd++;
+        }
+        retVal = std::make_pair(nTypeNameStart, nTypeNameEnd);
+    }
+    else
+    {
+        retVal = std::make_pair(-1, -1);
+    }
+    return retVal;
+}
+
+
+/*
+  MS Crypto uses the 'S' tag (equal to the 'ST' tag in NSS), but the NSS can't recognise
+  it, so the 'S' tag should be changed to 'ST' tag. However I am not sure if this is necessary
+  anymore, because we provide always the signers certificate when signing. So libmlsec can find
+  the private key based on the provided certificate (X509Certificate element) and does not need
+  the issuer name (X509IssuerName element). The issuer name in the xml signature has also no
+  effect for the signature nor the certificate validation.
+  In many RFCs, for example 4519, on speaks of 'ST'. However, the certificate does not contain
+  strings for type names. Instead it uses OIDs.
+ */
+
+static OUString replaceTagSWithTagST(OUString const & oldDN)
+{
+    std::pair<sal_Int32, sal_Int32 > pairIndex = findTypeInDN(oldDN, "S");
+
+    if (pairIndex.first != -1)
+    {
+        return oldDN.copy(0, pairIndex.first)+"ST"+oldDN.copy(pairIndex.second);
+    }
+    return oldDN;
+}
+/* end */
+
+X509Certificate_MSCryptImpl::X509Certificate_MSCryptImpl() :
+    m_pCertContext( nullptr )
+{
+}
+
+X509Certificate_MSCryptImpl::~X509Certificate_MSCryptImpl() {
+    if( m_pCertContext != nullptr ) {
+        CertFreeCertificateContext( m_pCertContext ) ;
+    }
+}
+
+//Methods from XCertificate
+sal_Int16 SAL_CALL X509Certificate_MSCryptImpl::getVersion() {
+    if( m_pCertContext != nullptr && m_pCertContext->pCertInfo != nullptr ) {
+        return static_cast<char>(m_pCertContext->pCertInfo->dwVersion) ;
+    } else {
+        return -1 ;
+    }
+}
+
+css::uno::Sequence< sal_Int8 > SAL_CALL X509Certificate_MSCryptImpl::getSerialNumber() {
+    if( m_pCertContext != nullptr && m_pCertContext->pCertInfo != nullptr ) {
+        Sequence< sal_Int8 > serial( m_pCertContext->pCertInfo->SerialNumber.cbData ) ;
+        for( unsigned int i = 0 ; i < m_pCertContext->pCertInfo->SerialNumber.cbData ; i ++ )
+            serial[i] = *( m_pCertContext->pCertInfo->SerialNumber.pbData + m_pCertContext->pCertInfo->SerialNumber.cbData - i - 1 ) ;
+
+        return serial ;
+    } else {
+        return Sequence< sal_Int8 >();
+    }
+}
+
+OUString SAL_CALL X509Certificate_MSCryptImpl::getIssuerName() {
+    if( m_pCertContext != nullptr && m_pCertContext->pCertInfo != nullptr ) {
+        DWORD cchIssuer = CertNameToStrW(
+            X509_ASN_ENCODING | PKCS_7_ASN_ENCODING ,
+            &( m_pCertContext->pCertInfo->Issuer ),
+            CERT_X500_NAME_STR | CERT_NAME_STR_REVERSE_FLAG ,
+            nullptr, 0
+        ) ;
+
+        // Here the cbIssuer count the last 0x00 , take care.
+        if( cchIssuer != 0 ) {
+            auto issuer = std::make_unique<wchar_t[]>(cchIssuer);
+
+            cchIssuer = CertNameToStrW(
+                X509_ASN_ENCODING | PKCS_7_ASN_ENCODING ,
+                &( m_pCertContext->pCertInfo->Issuer ),
+                CERT_X500_NAME_STR | CERT_NAME_STR_REVERSE_FLAG ,
+                issuer.get(), cchIssuer
+            ) ;
+
+            if( cchIssuer <= 0 ) {
+                throw RuntimeException() ;
+            }
+
+            if(issuer.get()[cchIssuer -1] == 0) cchIssuer--; //delimit the last 0x00;
+            OUString xIssuer(o3tl::toU(issuer.get()), cchIssuer) ;
+
+            return replaceTagSWithTagST(xIssuer);
+        } else {
+            return OUString() ;
+        }
+    } else {
+        return OUString() ;
+    }
+}
+
+OUString SAL_CALL X509Certificate_MSCryptImpl::getSubjectName()
+{
+    if( m_pCertContext != nullptr && m_pCertContext->pCertInfo != nullptr )
+    {
+        DWORD cchSubject = CertNameToStrW(
+            X509_ASN_ENCODING | PKCS_7_ASN_ENCODING ,
+            &( m_pCertContext->pCertInfo->Subject ),
+            CERT_X500_NAME_STR | CERT_NAME_STR_REVERSE_FLAG ,
+            nullptr, 0
+        ) ;
+
+        if( cchSubject != 0 )
+        {
+            auto subject = std::make_unique<wchar_t[]>(cchSubject);
+
+            cchSubject = CertNameToStrW(
+                X509_ASN_ENCODING | PKCS_7_ASN_ENCODING ,
+                &( m_pCertContext->pCertInfo->Subject ),
+                CERT_X500_NAME_STR | CERT_NAME_STR_REVERSE_FLAG ,
+                subject.get(), cchSubject
+            ) ;
+
+            if( cchSubject <= 0 ) {
+                throw RuntimeException() ;
+            }
+
+            OUString xSubject(o3tl::toU(subject.get()));
+
+            return replaceTagSWithTagST(xSubject);
+        } else
+        {
+            return OUString() ;
+        }
+    }
+    else
+    {
+        return OUString() ;
+    }
+}
+
+css::util::DateTime SAL_CALL X509Certificate_MSCryptImpl::getNotValidBefore() {
+    if( m_pCertContext != nullptr && m_pCertContext->pCertInfo != nullptr ) {
+        SYSTEMTIME explTime ;
+        DateTime dateTime ;
+        FILETIME localFileTime;
+
+        if (FileTimeToLocalFileTime(&( m_pCertContext->pCertInfo->NotBefore ), &localFileTime))
+        {
+            if( FileTimeToSystemTime( &localFileTime, &explTime ) ) {
+                //Convert the time to readable local time
+                dateTime.NanoSeconds = explTime.wMilliseconds * ::tools::Time::nanoPerMilli ;
+                dateTime.Seconds = explTime.wSecond ;
+                dateTime.Minutes = explTime.wMinute ;
+                dateTime.Hours = explTime.wHour ;
+                dateTime.Day = explTime.wDay ;
+                dateTime.Month = explTime.wMonth ;
+                dateTime.Year = explTime.wYear ;
+            }
+        }
+
+        return dateTime ;
+    } else {
+        return DateTime() ;
+    }
+}
+
+css::util::DateTime SAL_CALL X509Certificate_MSCryptImpl::getNotValidAfter() {
+    if( m_pCertContext != nullptr && m_pCertContext->pCertInfo != nullptr ) {
+        SYSTEMTIME explTime ;
+        DateTime dateTime ;
+        FILETIME localFileTime;
+
+        if (FileTimeToLocalFileTime(&( m_pCertContext->pCertInfo->NotAfter ), &localFileTime))
+        {
+            if( FileTimeToSystemTime( &localFileTime, &explTime ) ) {
+                //Convert the time to readable local time
+                dateTime.NanoSeconds = explTime.wMilliseconds * ::tools::Time::nanoPerMilli ;
+                dateTime.Seconds = explTime.wSecond ;
+                dateTime.Minutes = explTime.wMinute ;
+                dateTime.Hours = explTime.wHour ;
+                dateTime.Day = explTime.wDay ;
+                dateTime.Month = explTime.wMonth ;
+                dateTime.Year = explTime.wYear ;
+            }
+        }
+
+        return dateTime ;
+    } else {
+        return DateTime() ;
+    }
+}
+
+css::uno::Sequence< sal_Int8 > SAL_CALL X509Certificate_MSCryptImpl::getIssuerUniqueID() {
+    if( m_pCertContext != nullptr && m_pCertContext->pCertInfo != nullptr ) {
+        Sequence< sal_Int8 > issuerUid( m_pCertContext->pCertInfo->IssuerUniqueId.cbData ) ;
+        for( unsigned int i = 0 ; i < m_pCertContext->pCertInfo->IssuerUniqueId.cbData; i ++ )
+            issuerUid[i] = *( m_pCertContext->pCertInfo->IssuerUniqueId.pbData + i ) ;
+
+        return issuerUid ;
+    } else {
+        return Sequence< sal_Int8 >();
+    }
+}
+
+css::uno::Sequence< sal_Int8 > SAL_CALL X509Certificate_MSCryptImpl::getSubjectUniqueID() {
+    if( m_pCertContext != nullptr && m_pCertContext->pCertInfo != nullptr ) {
+        Sequence< sal_Int8 > subjectUid( m_pCertContext->pCertInfo->SubjectUniqueId.cbData ) ;
+        for( unsigned int i = 0 ; i < m_pCertContext->pCertInfo->SubjectUniqueId.cbData; i ++ )
+            subjectUid[i] = *( m_pCertContext->pCertInfo->SubjectUniqueId.pbData + i ) ;
+
+        return subjectUid ;
+    } else {
+        return Sequence< sal_Int8 >();
+    }
+}
+
+css::uno::Sequence< css::uno::Reference< css::security::XCertificateExtension > > SAL_CALL X509Certificate_MSCryptImpl::getExtensions() {
+    if( m_pCertContext != nullptr && m_pCertContext->pCertInfo != nullptr && m_pCertContext->pCertInfo->cExtension != 0 ) {
+        CertificateExtension_XmlSecImpl* xExtn ;
+        Sequence< Reference< XCertificateExtension > > xExtns( m_pCertContext->pCertInfo->cExtension ) ;
+
+        for( unsigned int i = 0; i < m_pCertContext->pCertInfo->cExtension; i++ ) {
+            CERT_EXTENSION* pExtn = &(m_pCertContext->pCertInfo->rgExtension[i]) ;
+
+
+            OUString objId = OUString::createFromAscii( pExtn->pszObjId );
+
+            if ( objId == "2.5.29.17" )
+                xExtn = reinterpret_cast<CertificateExtension_XmlSecImpl*>(new SanExtensionImpl());
+            else
+                xExtn = new CertificateExtension_XmlSecImpl;
+
+            xExtn->setCertExtn( pExtn->Value.pbData, pExtn->Value.cbData, reinterpret_cast<unsigned char*>(pExtn->pszObjId), strlen( pExtn->pszObjId ), pExtn->fCritical ) ;
+
+            xExtns[i] = xExtn ;
+        }
+
+        return xExtns ;
+    } else {
+        return Sequence< Reference< XCertificateExtension > >();
+    }
+}
+
+css::uno::Reference< css::security::XCertificateExtension > SAL_CALL X509Certificate_MSCryptImpl::findCertificateExtension( const css::uno::Sequence< sal_Int8 >& /*oid*/ ) {
+    if( m_pCertContext != nullptr && m_pCertContext->pCertInfo != nullptr && m_pCertContext->pCertInfo->cExtension != 0 ) {
+        CertificateExtension_XmlSecImpl* xExtn ;
+
+        xExtn = nullptr ;
+        for( unsigned int i = 0; i < m_pCertContext->pCertInfo->cExtension; i++ ) {
+            CERT_EXTENSION* pExtn = &( m_pCertContext->pCertInfo->rgExtension[i] ) ;
+
+            //TODO: Compare the oid
+            if( false ) {
+                xExtn = new CertificateExtension_XmlSecImpl;
+                xExtn->setCertExtn( pExtn->Value.pbData, pExtn->Value.cbData, reinterpret_cast<unsigned char*>(pExtn->pszObjId), strlen( pExtn->pszObjId ), pExtn->fCritical ) ;
+            }
+        }
+
+        return xExtn ;
+    } else {
+        return nullptr ;
+    }
+}
+
+
+css::uno::Sequence< sal_Int8 > SAL_CALL X509Certificate_MSCryptImpl::getEncoded() {
+    if( m_pCertContext != nullptr && m_pCertContext->cbCertEncoded > 0 ) {
+        Sequence< sal_Int8 > rawCert( m_pCertContext->cbCertEncoded ) ;
+
+        for( unsigned int i = 0 ; i < m_pCertContext->cbCertEncoded ; i ++ )
+            rawCert[i] = *( m_pCertContext->pbCertEncoded + i ) ;
+
+        return rawCert ;
+    } else {
+        return Sequence< sal_Int8 >();
+    }
+}
+
+//Helper methods
+void X509Certificate_MSCryptImpl::setMswcryCert( const CERT_CONTEXT* cert ) {
+    if( m_pCertContext != nullptr ) {
+        CertFreeCertificateContext( m_pCertContext ) ;
+        m_pCertContext = nullptr ;
+    }
+
+    if( cert != nullptr ) {
+        m_pCertContext = CertDuplicateCertificateContext( cert ) ;
+    }
+}
+
+const CERT_CONTEXT* X509Certificate_MSCryptImpl::getMswcryCert() const {
+    if( m_pCertContext != nullptr ) {
+        return m_pCertContext ;
+    } else {
+        return nullptr ;
+    }
+}
+
+void X509Certificate_MSCryptImpl::setRawCert( Sequence< sal_Int8 > const & rawCert ) {
+    if( m_pCertContext != nullptr ) {
+        CertFreeCertificateContext( m_pCertContext ) ;
+        m_pCertContext = nullptr ;
+    }
+
+    if( rawCert.getLength() != 0 ) {
+        m_pCertContext = CertCreateCertificateContext( X509_ASN_ENCODING, reinterpret_cast<const sal_uInt8*>(&rawCert[0]), rawCert.getLength() ) ;
+    }
+}
+
+/* XUnoTunnel */
+UNO3_GETIMPLEMENTATION_IMPL(X509Certificate_MSCryptImpl);
+
+static OUString findOIDDescription(char const *oid)
+{
+    OUString ouOID = OUString::createFromAscii( oid );
+    for (int i=0; i<nOID; i++)
+    {
+        OUString item = OUString::createFromAscii( OIDs[i].oid );
+        if (ouOID == item)
+        {
+            return OUString::createFromAscii( OIDs[i].desc );
+        }
+    }
+
+    return OUString() ;
+}
+
+static css::uno::Sequence< sal_Int8 > getThumbprint(const CERT_CONTEXT* pCertContext, DWORD dwPropId)
+{
+    if( pCertContext != nullptr )
+    {
+        DWORD cbData = dwPropId == CERT_SHA256_HASH_PROP_ID ? 32 : 20;
+        unsigned char fingerprint[32];
+        if (CertGetCertificateContextProperty(pCertContext, dwPropId, fingerprint, &cbData))
+        {
+            Sequence< sal_Int8 > thumbprint( cbData ) ;
+            for( unsigned int i = 0 ; i < cbData ; i ++ )
+            {
+                thumbprint[i] = fingerprint[i];
+            }
+
+            return thumbprint;
+        }
+        else
+        {
+            DWORD e = GetLastError();
+            cbData = e;
+        }
+    }
+
+    return Sequence< sal_Int8 >();
+}
+
+OUString SAL_CALL X509Certificate_MSCryptImpl::getSubjectPublicKeyAlgorithm()
+{
+    if( m_pCertContext != nullptr && m_pCertContext->pCertInfo != nullptr )
+    {
+        CRYPT_ALGORITHM_IDENTIFIER algorithm = m_pCertContext->pCertInfo->SubjectPublicKeyInfo.Algorithm;
+        return findOIDDescription( algorithm.pszObjId ) ;
+    }
+    else
+    {
+        return OUString() ;
+    }
+}
+
+css::uno::Sequence< sal_Int8 > SAL_CALL X509Certificate_MSCryptImpl::getSubjectPublicKeyValue()
+{
+    if( m_pCertContext != nullptr && m_pCertContext->pCertInfo != nullptr )
+    {
+        CRYPT_BIT_BLOB publicKey = m_pCertContext->pCertInfo->SubjectPublicKeyInfo.PublicKey;
+
+        Sequence< sal_Int8 > key( publicKey.cbData ) ;
+        for( unsigned int i = 0 ; i < publicKey.cbData ; i++ )
+        {
+            key[i] = *(publicKey.pbData + i) ;
+        }
+
+        return key;
+    }
+    else
+    {
+        return Sequence< sal_Int8 >();
+    }
+}
+
+OUString SAL_CALL X509Certificate_MSCryptImpl::getSignatureAlgorithm()
+{
+    if( m_pCertContext != nullptr && m_pCertContext->pCertInfo != nullptr )
+    {
+        CRYPT_ALGORITHM_IDENTIFIER algorithm = m_pCertContext->pCertInfo->SignatureAlgorithm;
+        return findOIDDescription( algorithm.pszObjId ) ;
+    }
+    else
+    {
+        return OUString() ;
+    }
+}
+
+uno::Sequence<sal_Int8> X509Certificate_MSCryptImpl::getSHA256Thumbprint()
+{
+    return getThumbprint(m_pCertContext, CERT_SHA256_HASH_PROP_ID);
+}
+
+svl::crypto::SignatureMethodAlgorithm X509Certificate_MSCryptImpl::getSignatureMethodAlgorithm()
+{
+    svl::crypto::SignatureMethodAlgorithm nRet = svl::crypto::SignatureMethodAlgorithm::RSA;
+
+    if (!m_pCertContext || !m_pCertContext->pCertInfo)
+        return nRet;
+
+    CRYPT_ALGORITHM_IDENTIFIER algorithm = m_pCertContext->pCertInfo->SubjectPublicKeyInfo.Algorithm;
+    OString aObjId(algorithm.pszObjId);
+    if (aObjId == szOID_ECC_PUBLIC_KEY)
+        nRet = svl::crypto::SignatureMethodAlgorithm::ECDSA;
+
+    return nRet;
+}
+
+css::uno::Sequence< sal_Int8 > SAL_CALL X509Certificate_MSCryptImpl::getSHA1Thumbprint()
+{
+    return getThumbprint(m_pCertContext, CERT_SHA1_HASH_PROP_ID);
+}
+
+css::uno::Sequence< sal_Int8 > SAL_CALL X509Certificate_MSCryptImpl::getMD5Thumbprint()
+{
+    return getThumbprint(m_pCertContext, CERT_MD5_HASH_PROP_ID);
+}
+
+CertificateKind SAL_CALL X509Certificate_MSCryptImpl::getCertificateKind()
+{
+    return CertificateKind_X509;
+}
+
+sal_Int32 SAL_CALL X509Certificate_MSCryptImpl::getCertificateUsage(  )
+{
+    sal_Int32 usage =
+        CERT_DATA_ENCIPHERMENT_KEY_USAGE |
+        CERT_DIGITAL_SIGNATURE_KEY_USAGE |
+        CERT_KEY_AGREEMENT_KEY_USAGE |
+        CERT_KEY_CERT_SIGN_KEY_USAGE |
+        CERT_KEY_ENCIPHERMENT_KEY_USAGE |
+        CERT_NON_REPUDIATION_KEY_USAGE |
+        CERT_OFFLINE_CRL_SIGN_KEY_USAGE;
+
+    if( m_pCertContext != nullptr && m_pCertContext->pCertInfo != nullptr && m_pCertContext->pCertInfo->cExtension != 0 )
+    {
+        CERT_EXTENSION* pExtn = CertFindExtension(
+            szOID_KEY_USAGE,
+            m_pCertContext->pCertInfo->cExtension,
+            m_pCertContext->pCertInfo->rgExtension);
+
+        if (pExtn != nullptr)
+        {
+            DWORD length = 0;
+            bool rc = CryptDecodeObject(
+                X509_ASN_ENCODING,
+                X509_KEY_USAGE,
+                pExtn->Value.pbData,
+                pExtn->Value.cbData,
+                0,
+                nullptr,
+                &length);
+
+            if (!rc)
+                SAL_WARN("xmlsecurity.xmlsec", "CryptDecodeObject failed: " << WindowsErrorString(GetLastError()));
+            else
+            {
+                std::vector<char>buffer(length);
+
+                rc = CryptDecodeObject(
+                    X509_ASN_ENCODING,
+                    X509_KEY_USAGE,
+                    pExtn->Value.pbData,
+                    pExtn->Value.cbData,
+                    0,
+                    buffer.data(),
+                    &length);
+
+                CRYPT_BIT_BLOB *blob = reinterpret_cast<CRYPT_BIT_BLOB*>(buffer.data());
+                if (!rc)
+                    SAL_WARN("xmlsecurity.xmlsec", "CryptDecodeObject failed: " << WindowsErrorString(GetLastError()));
+                else if (blob->cbData == 1)
+                    usage = blob->pbData[0];
+                else
+                    SAL_WARN("xmlsecurity.xmlsec", "CryptDecodeObject(X509_KEY_USAGE) returned unexpected amount of data: " << blob->cbData);
+            }
+        }
+    }
+
+    return usage;
+}
+
+/* XServiceInfo */
+OUString SAL_CALL X509Certificate_MSCryptImpl::getImplementationName()
+{
+    return "com.sun.star.xml.security.gpg.XCertificate_MsCryptImpl";
+}
+
+/* XServiceInfo */
+sal_Bool SAL_CALL X509Certificate_MSCryptImpl::supportsService(const OUString& serviceName)
+{
+    return cppu::supportsService(this, serviceName);
+}
+
+/* XServiceInfo */
+Sequence<OUString> SAL_CALL X509Certificate_MSCryptImpl::getSupportedServiceNames()
+{
+    return { OUString() };
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/xmlsec/mscrypt/x509certificate_mscryptimpl.hxx b/xmlsecurity/source/xmlsec/mscrypt/x509certificate_mscryptimpl.hxx
new file mode 100644
index 000000000..225d5f6bd
--- /dev/null
+++ b/xmlsecurity/source/xmlsec/mscrypt/x509certificate_mscryptimpl.hxx
@@ -0,0 +1,99 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#ifndef INCLUDED_XMLSECURITY_SOURCE_XMLSEC_MSCRYPT_X509CERTIFICATE_MSCRYPTIMPL_HXX
+#define INCLUDED_XMLSECURITY_SOURCE_XMLSEC_MSCRYPT_X509CERTIFICATE_MSCRYPTIMPL_HXX
+
+#if !defined WIN32_LEAN_AND_MEAN
+# define WIN32_LEAN_AND_MEAN
+#endif
+#include <Windows.h>
+#include <WinCrypt.h>
+#include <sal/config.h>
+#include <rtl/ustring.hxx>
+#include <cppuhelper/factory.hxx>
+#include <cppuhelper/implbase.hxx>
+#include <comphelper/servicehelper.hxx>
+#include <com/sun/star/uno/Exception.hpp>
+#include <com/sun/star/lang/XUnoTunnel.hpp>
+#include <com/sun/star/lang/XServiceInfo.hpp>
+#include <com/sun/star/uno/SecurityException.hpp>
+#include <com/sun/star/security/CertificateKind.hpp>
+#include <com/sun/star/security/XCertificate.hpp>
+#include <certificate.hxx>
+
+class X509Certificate_MSCryptImpl : public ::cppu::WeakImplHelper<
+    css::security::XCertificate ,
+    css::lang::XUnoTunnel,
+    css::lang::XServiceInfo > , public xmlsecurity::Certificate
+{
+    private:
+        const CERT_CONTEXT* m_pCertContext ;
+
+    public:
+        X509Certificate_MSCryptImpl() ;
+        virtual ~X509Certificate_MSCryptImpl() override;
+
+        //Methods from XCertificate
+        virtual sal_Int16 SAL_CALL getVersion() override;
+
+        virtual css::uno::Sequence< sal_Int8 > SAL_CALL getSerialNumber() override;
+        virtual OUString SAL_CALL getIssuerName() override;
+        virtual OUString SAL_CALL getSubjectName() override;
+        virtual css::util::DateTime SAL_CALL getNotValidBefore() override;
+        virtual css::util::DateTime SAL_CALL getNotValidAfter() override;
+        virtual css::uno::Sequence< sal_Int8 > SAL_CALL getIssuerUniqueID() override;
+        virtual css::uno::Sequence< sal_Int8 > SAL_CALL getSubjectUniqueID() override;
+        virtual css::uno::Sequence< css::uno::Reference< css::security::XCertificateExtension > > SAL_CALL getExtensions() override;
+        virtual css::uno::Reference< css::security::XCertificateExtension > SAL_CALL findCertificateExtension( const css::uno::Sequence< sal_Int8 >& oid ) override;
+        virtual css::uno::Sequence< sal_Int8 > SAL_CALL getEncoded() override;
+        virtual OUString SAL_CALL getSubjectPublicKeyAlgorithm() override;
+        virtual css::uno::Sequence< sal_Int8 > SAL_CALL getSubjectPublicKeyValue() override;
+        virtual OUString SAL_CALL getSignatureAlgorithm() override;
+        virtual css::uno::Sequence< sal_Int8 > SAL_CALL getSHA1Thumbprint() override;
+        virtual css::uno::Sequence< sal_Int8 > SAL_CALL getMD5Thumbprint() override;
+        virtual css::security::CertificateKind SAL_CALL getCertificateKind() override;
+
+
+        virtual sal_Int32 SAL_CALL getCertificateUsage( ) override;
+
+        //Methods from XUnoTunnel
+        UNO3_GETIMPLEMENTATION_DECL(X509Certificate_MSCryptImpl)
+
+        /// @see xmlsecurity::Certificate::getSHA256Thumbprint().
+        virtual css::uno::Sequence<sal_Int8> getSHA256Thumbprint() override;
+
+        /// @see xmlsecurity::Certificate::getSignatureMethodAlgorithm().
+        virtual svl::crypto::SignatureMethodAlgorithm getSignatureMethodAlgorithm() override;
+
+        //Helper methods
+        void setMswcryCert( const CERT_CONTEXT* cert ) ;
+        const CERT_CONTEXT* getMswcryCert() const ;
+        /// @throws css::uno::RuntimeException
+        void setRawCert( css::uno::Sequence< sal_Int8 > const & rawCert ) ;
+
+        // XServiceInfo
+        virtual OUString SAL_CALL getImplementationName() override;
+        virtual sal_Bool SAL_CALL supportsService(const OUString& ServiceName) override;
+        virtual css::uno::Sequence<OUString> SAL_CALL getSupportedServiceNames() override;
+} ;
+
+#endif // INCLUDED_XMLSECURITY_SOURCE_XMLSEC_MSCRYPT_X509CERTIFICATE_MSCRYPTIMPL_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/xmlsec/mscrypt/xmlsecuritycontext_mscryptimpl.cxx b/xmlsecurity/source/xmlsec/mscrypt/xmlsecuritycontext_mscryptimpl.cxx
new file mode 100644
index 000000000..2f33df7c9
--- /dev/null
+++ b/xmlsecurity/source/xmlsec/mscrypt/xmlsecuritycontext_mscryptimpl.cxx
@@ -0,0 +1,156 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <sal/config.h>
+#include <xmlsec-wrapper.h>
+
+#include <com/sun/star/xml/crypto/XXMLSecurityContext.hpp>
+#include "securityenvironment_mscryptimpl.hxx"
+
+#include <xmlsec/xmlstreamio.hxx>
+#include "akmngr.hxx"
+
+#include <cppuhelper/supportsservice.hxx>
+
+using namespace ::com::sun::star;
+using namespace ::com::sun::star::lang ;
+using ::com::sun::star::lang::XMultiServiceFactory ;
+using ::com::sun::star::lang::XSingleServiceFactory ;
+
+using ::com::sun::star::xml::crypto::XSecurityEnvironment ;
+using ::com::sun::star::xml::crypto::XXMLSecurityContext ;
+
+namespace {
+
+class XMLSecurityContext_MSCryptImpl : public ::cppu::WeakImplHelper<
+    css::xml::crypto::XXMLSecurityContext ,
+    css::lang::XServiceInfo >
+{
+    private:
+        //xmlSecKeysMngrPtr m_pKeysMngr ;
+        css::uno::Reference< css::xml::crypto::XSecurityEnvironment > m_xSecurityEnvironment ;
+
+    public:
+        XMLSecurityContext_MSCryptImpl();
+
+        //Methods from XXMLSecurityContext
+        virtual sal_Int32 SAL_CALL addSecurityEnvironment(
+            const css::uno::Reference< css::xml::crypto::XSecurityEnvironment >& aSecurityEnvironment
+            ) override;
+
+        virtual ::sal_Int32 SAL_CALL getSecurityEnvironmentNumber(  ) override;
+
+        virtual css::uno::Reference<
+            css::xml::crypto::XSecurityEnvironment > SAL_CALL
+            getSecurityEnvironmentByIndex( ::sal_Int32 index ) override;
+
+        virtual css::uno::Reference<
+            css::xml::crypto::XSecurityEnvironment > SAL_CALL
+            getSecurityEnvironment(  ) override;
+
+        virtual ::sal_Int32 SAL_CALL getDefaultSecurityEnvironmentIndex(  ) override;
+
+        virtual void SAL_CALL setDefaultSecurityEnvironmentIndex( sal_Int32 nDefaultEnvIndex ) override;
+
+
+        //Methods from XServiceInfo
+        virtual OUString SAL_CALL getImplementationName() override;
+
+        virtual sal_Bool SAL_CALL supportsService(
+            const OUString& ServiceName
+        ) override;
+
+        virtual css::uno::Sequence< OUString > SAL_CALL getSupportedServiceNames() override;
+};
+
+}
+
+XMLSecurityContext_MSCryptImpl::XMLSecurityContext_MSCryptImpl()
+{
+}
+
+sal_Int32 SAL_CALL XMLSecurityContext_MSCryptImpl::addSecurityEnvironment(
+    const css::uno::Reference< css::xml::crypto::XSecurityEnvironment >& aSecurityEnvironment)
+{
+    if( !aSecurityEnvironment.is() )
+    {
+        throw uno::RuntimeException() ;
+    }
+
+    m_xSecurityEnvironment = aSecurityEnvironment;
+
+    return 0;
+}
+
+
+sal_Int32 SAL_CALL XMLSecurityContext_MSCryptImpl::getSecurityEnvironmentNumber(  )
+{
+    return 1;
+}
+
+css::uno::Reference< css::xml::crypto::XSecurityEnvironment > SAL_CALL
+    XMLSecurityContext_MSCryptImpl::getSecurityEnvironmentByIndex( sal_Int32 index )
+{
+    if (index != 0)
+    {
+        throw uno::RuntimeException() ;
+    }
+    return m_xSecurityEnvironment;
+}
+
+css::uno::Reference< css::xml::crypto::XSecurityEnvironment > SAL_CALL
+    XMLSecurityContext_MSCryptImpl::getSecurityEnvironment(  )
+{
+    return m_xSecurityEnvironment;
+}
+
+sal_Int32 SAL_CALL XMLSecurityContext_MSCryptImpl::getDefaultSecurityEnvironmentIndex(  )
+{
+    return 0;
+}
+
+void SAL_CALL XMLSecurityContext_MSCryptImpl::setDefaultSecurityEnvironmentIndex( sal_Int32 /*nDefaultEnvIndex*/ )
+{
+    //dummy
+}
+
+/* XServiceInfo */
+OUString SAL_CALL XMLSecurityContext_MSCryptImpl::getImplementationName() {
+    return "com.sun.star.xml.crypto.XMLSecurityContext" ;
+}
+
+/* XServiceInfo */
+sal_Bool SAL_CALL XMLSecurityContext_MSCryptImpl::supportsService( const OUString& serviceName) {
+    return cppu::supportsService(this, serviceName);
+}
+
+/* XServiceInfo */
+uno::Sequence< OUString > SAL_CALL XMLSecurityContext_MSCryptImpl::getSupportedServiceNames() {
+    uno::Sequence<OUString> seqServiceNames { "com.sun.star.xml.crypto.XMLSecurityContext" };
+    return seqServiceNames ;
+}
+
+extern "C" SAL_DLLPUBLIC_EXPORT uno::XInterface*
+com_sun_star_xml_crypto_XMLSecurityContext_get_implementation(
+    uno::XComponentContext* /*pCtx*/, uno::Sequence<uno::Any> const& /*rSeq*/)
+{
+    return cppu::acquire(new XMLSecurityContext_MSCryptImpl);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/xmlsec/mscrypt/xmlsignature_mscryptimpl.cxx b/xmlsecurity/source/xmlsec/mscrypt/xmlsignature_mscryptimpl.cxx
new file mode 100644
index 000000000..dcbad0348
--- /dev/null
+++ b/xmlsecurity/source/xmlsec/mscrypt/xmlsignature_mscryptimpl.cxx
@@ -0,0 +1,305 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <sal/config.h>
+#include <rtl/uuid.h>
+#include <xmlsec-wrapper.h>
+
+#include <com/sun/star/xml/crypto/SecurityOperationStatus.hpp>
+#include <com/sun/star/xml/crypto/XXMLSignature.hpp>
+
+#include "securityenvironment_mscryptimpl.hxx"
+
+#include <xmlsec/xmldocumentwrapper_xmlsecimpl.hxx>
+#include <xmlelementwrapper_xmlsecimpl.hxx>
+#include <xmlsec/xmlstreamio.hxx>
+#include <xmlsec/errorcallback.hxx>
+#include <cppuhelper/supportsservice.hxx>
+
+using namespace ::com::sun::star;
+using namespace ::com::sun::star::uno ;
+using namespace ::com::sun::star::lang ;
+using ::com::sun::star::lang::XMultiServiceFactory ;
+using ::com::sun::star::lang::XSingleServiceFactory ;
+
+using ::com::sun::star::xml::wrapper::XXMLElementWrapper ;
+using ::com::sun::star::xml::wrapper::XXMLDocumentWrapper ;
+using ::com::sun::star::xml::crypto::XSecurityEnvironment ;
+using ::com::sun::star::xml::crypto::XXMLSignature ;
+using ::com::sun::star::xml::crypto::XXMLSignatureTemplate ;
+using ::com::sun::star::xml::crypto::XXMLSecurityContext ;
+using ::com::sun::star::xml::crypto::XUriBinding ;
+
+namespace {
+
+class XMLSignature_MSCryptImpl : public ::cppu::WeakImplHelper<
+    css::xml::crypto::XXMLSignature ,
+    css::lang::XServiceInfo >
+{
+    public:
+        explicit XMLSignature_MSCryptImpl();
+
+        //Methods from XXMLSignature
+        virtual css::uno::Reference< css::xml::crypto::XXMLSignatureTemplate > SAL_CALL generate(
+            const css::uno::Reference< css::xml::crypto::XXMLSignatureTemplate >& aTemplate ,
+            const css::uno::Reference< css::xml::crypto::XSecurityEnvironment >& aEnvironment
+        ) override;
+
+        virtual css::uno::Reference< css::xml::crypto::XXMLSignatureTemplate > SAL_CALL validate(
+            const css::uno::Reference< css::xml::crypto::XXMLSignatureTemplate >& aTemplate ,
+            const css::uno::Reference< css::xml::crypto::XXMLSecurityContext >& aContext
+        ) override;
+
+        //Methods from XServiceInfo
+        virtual OUString SAL_CALL getImplementationName() override;
+
+        virtual sal_Bool SAL_CALL supportsService(
+            const OUString& ServiceName
+        ) override;
+
+        virtual css::uno::Sequence< OUString > SAL_CALL getSupportedServiceNames() override;
+} ;
+
+}
+
+XMLSignature_MSCryptImpl::XMLSignature_MSCryptImpl() {
+}
+
+/* XXMLSignature */
+Reference< XXMLSignatureTemplate >
+SAL_CALL XMLSignature_MSCryptImpl::generate(
+    const Reference< XXMLSignatureTemplate >& aTemplate ,
+    const Reference< XSecurityEnvironment >& aEnvironment
+)
+{
+    xmlSecKeysMngrPtr pMngr = nullptr ;
+    xmlSecDSigCtxPtr pDsigCtx = nullptr ;
+    xmlNodePtr pNode = nullptr ;
+
+    if( !aTemplate.is() )
+        throw RuntimeException() ;
+
+    if( !aEnvironment.is() )
+        throw RuntimeException() ;
+
+    //Get Keys Manager
+    Reference< XUnoTunnel > xSecTunnel( aEnvironment , UNO_QUERY_THROW ) ;
+    SecurityEnvironment_MSCryptImpl* pSecEnv = reinterpret_cast<SecurityEnvironment_MSCryptImpl*>(xSecTunnel->getSomething( SecurityEnvironment_MSCryptImpl::getUnoTunnelId() ));
+    if( pSecEnv == nullptr )
+        throw RuntimeException() ;
+
+    //Get the xml node
+    Reference< XXMLElementWrapper > xElement = aTemplate->getTemplate() ;
+    if( !xElement.is() ) {
+        throw RuntimeException() ;
+    }
+
+    Reference< XUnoTunnel > xNodTunnel( xElement , UNO_QUERY_THROW ) ;
+    XMLElementWrapper_XmlSecImpl* pElement = reinterpret_cast<XMLElementWrapper_XmlSecImpl*>(xNodTunnel->getSomething( XMLElementWrapper_XmlSecImpl::getUnoTunnelId() ));
+    if( pElement == nullptr ) {
+        throw RuntimeException() ;
+    }
+
+    pNode = pElement->getNativeElement() ;
+
+    //Get the stream/URI binding
+    Reference< XUriBinding > xUriBinding = aTemplate->getBinding() ;
+    if( xUriBinding.is() ) {
+        //Register the stream input callbacks into libxml2
+        if( xmlRegisterStreamInputCallbacks( xUriBinding ) < 0 )
+            throw RuntimeException() ;
+    }
+
+    setErrorRecorder( );
+
+    pMngr = pSecEnv->createKeysManager();
+    if( !pMngr ) {
+        throw RuntimeException() ;
+    }
+
+    //Create Signature context
+    pDsigCtx = xmlSecDSigCtxCreate( pMngr ) ;
+    if( pDsigCtx == nullptr )
+    {
+        //throw XMLSignatureException() ;
+        SecurityEnvironment_MSCryptImpl::destroyKeysManager( pMngr );
+        clearErrorRecorder();
+        return aTemplate;
+    }
+
+    //Sign the template
+    if( xmlSecDSigCtxSign( pDsigCtx , pNode ) == 0 )
+    {
+        if (pDsigCtx->status == xmlSecDSigStatusSucceeded)
+            aTemplate->setStatus(css::xml::crypto::SecurityOperationStatus_OPERATION_SUCCEEDED);
+        else
+            aTemplate->setStatus(css::xml::crypto::SecurityOperationStatus_UNKNOWN);
+    }
+    else
+    {
+        aTemplate->setStatus(css::xml::crypto::SecurityOperationStatus_UNKNOWN);
+    }
+
+
+    xmlSecDSigCtxDestroy( pDsigCtx ) ;
+    SecurityEnvironment_MSCryptImpl::destroyKeysManager( pMngr );
+
+    //Unregistered the stream/URI binding
+    if( xUriBinding.is() )
+        xmlUnregisterStreamInputCallbacks() ;
+
+    clearErrorRecorder();
+    return aTemplate ;
+}
+
+/* XXMLSignature */
+Reference< XXMLSignatureTemplate >
+SAL_CALL XMLSignature_MSCryptImpl::validate(
+    const Reference< XXMLSignatureTemplate >& aTemplate ,
+    const Reference< XXMLSecurityContext >& aSecurityCtx
+) {
+    xmlSecKeysMngrPtr pMngr = nullptr ;
+    xmlSecDSigCtxPtr pDsigCtx = nullptr ;
+    xmlNodePtr pNode = nullptr ;
+
+    if( !aTemplate.is() )
+        throw RuntimeException() ;
+
+    if( !aSecurityCtx.is() )
+        throw RuntimeException() ;
+
+    //Get Keys Manager
+    Reference< XSecurityEnvironment > xSecEnv
+        = aSecurityCtx->getSecurityEnvironmentByIndex(
+            aSecurityCtx->getDefaultSecurityEnvironmentIndex());
+    Reference< XUnoTunnel > xSecTunnel( xSecEnv , UNO_QUERY_THROW ) ;
+    SecurityEnvironment_MSCryptImpl* pSecEnv = reinterpret_cast<SecurityEnvironment_MSCryptImpl*>(xSecTunnel->getSomething( SecurityEnvironment_MSCryptImpl::getUnoTunnelId() ));
+    if( pSecEnv == nullptr )
+        throw RuntimeException() ;
+
+    //Get the xml node
+    Reference< XXMLElementWrapper > xElement = aTemplate->getTemplate() ;
+    if( !xElement.is() )
+        throw RuntimeException() ;
+
+    Reference< XUnoTunnel > xNodTunnel( xElement , UNO_QUERY_THROW ) ;
+    XMLElementWrapper_XmlSecImpl* pElement = reinterpret_cast<XMLElementWrapper_XmlSecImpl*>(xNodTunnel->getSomething( XMLElementWrapper_XmlSecImpl::getUnoTunnelId() ));
+    if( pElement == nullptr )
+        throw RuntimeException() ;
+
+    pNode = pElement->getNativeElement() ;
+
+    //Get the stream/URI binding
+    Reference< XUriBinding > xUriBinding = aTemplate->getBinding() ;
+    if( xUriBinding.is() ) {
+        //Register the stream input callbacks into libxml2
+        if( xmlRegisterStreamInputCallbacks( xUriBinding ) < 0 )
+            throw RuntimeException() ;
+    }
+
+    setErrorRecorder( );
+
+    pMngr = pSecEnv->createKeysManager();
+    if( !pMngr ) {
+        throw RuntimeException() ;
+    }
+
+    //Create Signature context
+    pDsigCtx = xmlSecDSigCtxCreate( pMngr ) ;
+    if( pDsigCtx == nullptr )
+    {
+        SecurityEnvironment_MSCryptImpl::destroyKeysManager( pMngr );
+        clearErrorRecorder();
+        return aTemplate;
+    }
+
+    // We do certificate verification ourselves.
+    pDsigCtx->keyInfoReadCtx.flags |= XMLSEC_KEYINFO_FLAGS_X509DATA_DONT_VERIFY_CERTS;
+
+    //Verify signature
+    //The documentation says that the signature is only valid if the return value is 0 (that is, not < 0)
+    //AND pDsigCtx->status == xmlSecDSigStatusSucceeded. That is, we must not make any assumptions, if
+    //the return value is < 0. Then we must regard the signature as INVALID. We cannot use the
+    //error recorder feature to get the ONE error that made the verification fail, because there is no
+    //documentation/specification as to how to interpret the number of recorded errors and what is the initial
+    //error.
+    int rs = xmlSecDSigCtxVerify(pDsigCtx , pNode);
+
+    // Also verify manifest: this is empty for ODF, but contains everything (except signature metadata) for OOXML.
+    xmlSecSize nReferenceCount = xmlSecPtrListGetSize(&pDsigCtx->manifestReferences);
+    // Require that all manifest references are also good.
+    xmlSecSize nReferenceGood = 0;
+    for (xmlSecSize nReference = 0; nReference < nReferenceCount; ++nReference)
+    {
+        xmlSecDSigReferenceCtxPtr pReference = static_cast<xmlSecDSigReferenceCtxPtr>(xmlSecPtrListGetItem(&pDsigCtx->manifestReferences, nReference));
+        if (pReference)
+        {
+             if (pReference->status == xmlSecDSigStatusSucceeded)
+                 ++nReferenceGood;
+        }
+    }
+
+    if (rs == 0 && nReferenceCount == nReferenceGood)
+    {
+        if (pDsigCtx->status == xmlSecDSigStatusSucceeded)
+            aTemplate->setStatus(css::xml::crypto::SecurityOperationStatus_OPERATION_SUCCEEDED);
+        else
+            aTemplate->setStatus(css::xml::crypto::SecurityOperationStatus_UNKNOWN);
+    }
+    else
+    {
+        aTemplate->setStatus(css::xml::crypto::SecurityOperationStatus_UNKNOWN);
+    }
+
+    xmlSecDSigCtxDestroy( pDsigCtx ) ;
+    SecurityEnvironment_MSCryptImpl::destroyKeysManager( pMngr );
+
+    //Unregistered the stream/URI binding
+    if( xUriBinding.is() )
+        xmlUnregisterStreamInputCallbacks() ;
+
+
+    clearErrorRecorder();
+    return aTemplate;
+}
+
+/* XServiceInfo */
+OUString SAL_CALL XMLSignature_MSCryptImpl::getImplementationName() {
+    return "com.sun.star.xml.crypto.XMLSignature";
+}
+
+/* XServiceInfo */
+sal_Bool SAL_CALL XMLSignature_MSCryptImpl::supportsService( const OUString& serviceName) {
+return cppu::supportsService(this, serviceName);
+}
+
+/* XServiceInfo */
+Sequence< OUString > SAL_CALL XMLSignature_MSCryptImpl::getSupportedServiceNames() {
+    Sequence<OUString> seqServiceNames { "com.sun.star.xml.crypto.XMLSignature" };
+    return seqServiceNames ;
+}
+
+extern "C" SAL_DLLPUBLIC_EXPORT uno::XInterface*
+com_sun_star_xml_crypto_XMLSignature_get_implementation(uno::XComponentContext* /*pCtx*/,
+                                                        uno::Sequence<uno::Any> const& /*rSeq*/)
+{
+    return cppu::acquire(new XMLSignature_MSCryptImpl);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/xmlsec/nss/certerrors.h b/xmlsecurity/source/xmlsec/nss/certerrors.h
new file mode 100644
index 000000000..e8b7b3873
--- /dev/null
+++ b/xmlsecurity/source/xmlsec/nss/certerrors.h
@@ -0,0 +1,385 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+{SEC_ERROR_IO, "An I/O error occurred during security authorization."},
+
+{SEC_ERROR_LIBRARY_FAILURE, "security library failure."},
+
+{SEC_ERROR_BAD_DATA, "security library: received bad data."},
+
+{SEC_ERROR_OUTPUT_LEN, "security library: output length error."},
+
+{SEC_ERROR_INPUT_LEN, "security library has experienced an input length error."},
+
+{SEC_ERROR_INVALID_ARGS, "security library: invalid arguments."},
+
+{SEC_ERROR_INVALID_ALGORITHM, "security library: invalid algorithm."},
+
+{SEC_ERROR_INVALID_AVA, "security library: invalid AVA."},
+
+{SEC_ERROR_INVALID_TIME, "Improperly formatted time string."},
+
+{SEC_ERROR_BAD_DER, "security library: improperly formatted DER-encoded message."},
+
+{SEC_ERROR_BAD_SIGNATURE, "Peer's certificate has an invalid signature."},
+
+{SEC_ERROR_EXPIRED_CERTIFICATE, "Peer's Certificate has expired."},
+
+{SEC_ERROR_REVOKED_CERTIFICATE, "Peer's Certificate has been revoked."},
+
+{SEC_ERROR_UNKNOWN_ISSUER, "Peer's Certificate issuer is not recognized."},
+
+{SEC_ERROR_BAD_KEY, "Peer's public key is invalid."},
+
+{SEC_ERROR_BAD_PASSWORD, "The security password entered is incorrect."},
+
+{SEC_ERROR_RETRY_PASSWORD, "New password entered incorrectly.  Please try again."},
+
+{SEC_ERROR_NO_NODELOCK, "security library: no nodelock."},
+
+{SEC_ERROR_BAD_DATABASE, "security library: bad database."},
+
+{SEC_ERROR_NO_MEMORY, "security library: memory allocation failure."},
+
+{SEC_ERROR_UNTRUSTED_ISSUER, "Peer's certificate issuer has been marked as not trusted by the user."},
+
+{SEC_ERROR_UNTRUSTED_CERT, "Peer's certificate has been marked as not trusted by the user."},
+
+{SEC_ERROR_DUPLICATE_CERT, "Certificate already exists in your database."},
+
+{SEC_ERROR_DUPLICATE_CERT_NAME, "Downloaded certificate's name duplicates one already in your database."},
+
+{SEC_ERROR_ADDING_CERT, "Error adding certificate to database."},
+
+{SEC_ERROR_FILING_KEY, "Error refiling the key for this certificate."},
+
+{SEC_ERROR_NO_KEY, "The private key for this certificate cannot be found in key database"},
+
+{SEC_ERROR_CERT_VALID, "This certificate is valid."},
+
+{SEC_ERROR_CERT_NOT_VALID, "This certificate is not valid."},
+
+{SEC_ERROR_CERT_NO_RESPONSE, "Cert Library: No Response"},
+
+{SEC_ERROR_EXPIRED_ISSUER_CERTIFICATE, "The certificate issuer's certificate has expired.  Check your system date and time."},
+
+{SEC_ERROR_CRL_EXPIRED, "The CRL for the certificate's issuer has expired.  Update it or check your system date and time."},
+
+{SEC_ERROR_CRL_BAD_SIGNATURE, "The CRL for the certificate's issuer has an invalid signature."},
+
+{SEC_ERROR_CRL_INVALID, "New CRL has an invalid format."},
+
+{SEC_ERROR_EXTENSION_VALUE_INVALID, "Certificate extension value is invalid."},
+
+{SEC_ERROR_EXTENSION_NOT_FOUND, "Certificate extension not found."},
+
+{SEC_ERROR_CA_CERT_INVALID, "Issuer certificate is invalid."},
+
+{SEC_ERROR_PATH_LEN_CONSTRAINT_INVALID, "Certificate path length constraint is invalid."},
+
+{SEC_ERROR_CERT_USAGES_INVALID, "Certificate usages field is invalid."},
+
+{SEC_INTERNAL_ONLY, "**Internal ONLY module**"},
+
+{SEC_ERROR_INVALID_KEY, "The key does not support the requested operation."},
+
+{SEC_ERROR_UNKNOWN_CRITICAL_EXTENSION, "Certificate contains unknown critical extension."},
+
+{SEC_ERROR_OLD_CRL, "New CRL is not later than the current one."},
+
+{SEC_ERROR_NO_EMAIL_CERT, "Not encrypted or signed: you do not yet have an email certificate."},
+
+{SEC_ERROR_NO_RECIPIENT_CERTS_QUERY, "Not encrypted: you do not have certificates for each of the recipients."},
+
+{SEC_ERROR_NOT_A_RECIPIENT, "Cannot decrypt: you are not a recipient, or matching certificate and \
+private key not found."},
+
+{SEC_ERROR_PKCS7_KEYALG_MISMATCH, "Cannot decrypt: key encryption algorithm does not match your certificate."},
+
+{SEC_ERROR_PKCS7_BAD_SIGNATURE, "Signature verification failed: no signer found, too many signers found, \
+or improper or corrupted data."},
+
+{SEC_ERROR_UNSUPPORTED_KEYALG, "Unsupported or unknown key algorithm."},
+
+{SEC_ERROR_DECRYPTION_DISALLOWED, "Cannot decrypt: encrypted using a disallowed algorithm or key size."},
+
+
+/* Fortezza Alerts */
+{XP_SEC_FORTEZZA_BAD_CARD, "Fortezza card has not been properly initialized.  \
+Please remove it and return it to your issuer."},
+
+{XP_SEC_FORTEZZA_NO_CARD, "No Fortezza cards Found"},
+
+{XP_SEC_FORTEZZA_NONE_SELECTED, "No Fortezza card selected"},
+
+{XP_SEC_FORTEZZA_MORE_INFO, "Please select a personality to get more info on"},
+
+{XP_SEC_FORTEZZA_PERSON_NOT_FOUND, "Personality not found"},
+
+{XP_SEC_FORTEZZA_NO_MORE_INFO, "No more information on that Personality"},
+
+{XP_SEC_FORTEZZA_BAD_PIN, "Invalid Pin"},
+
+{XP_SEC_FORTEZZA_PERSON_ERROR, "Couldn't initialize Fortezza personalities."},
+/* end fortezza alerts. */
+
+{SEC_ERROR_NO_KRL, "No KRL for this site's certificate has been found."},
+
+{SEC_ERROR_KRL_EXPIRED, "The KRL for this site's certificate has expired."},
+
+{SEC_ERROR_KRL_BAD_SIGNATURE, "The KRL for this site's certificate has an invalid signature."},
+
+{SEC_ERROR_REVOKED_KEY, "The key for this site's certificate has been revoked."},
+
+{SEC_ERROR_KRL_INVALID, "New KRL has an invalid format."},
+
+{SEC_ERROR_NEED_RANDOM, "security library: need random data."},
+
+{SEC_ERROR_NO_MODULE, "security library: no security module can perform the requested operation."},
+
+{SEC_ERROR_NO_TOKEN, "The security card or token does not exist, needs to be initialized, or has been removed."},
+
+{SEC_ERROR_READ_ONLY, "security library: read-only database."},
+
+{SEC_ERROR_NO_SLOT_SELECTED, "No slot or token was selected."},
+
+{SEC_ERROR_CERT_NICKNAME_COLLISION, "A certificate with the same nickname already exists."},
+
+{SEC_ERROR_KEY_NICKNAME_COLLISION, "A key with the same nickname already exists."},
+
+{SEC_ERROR_SAFE_NOT_CREATED, "error while creating safe object"},
+
+{SEC_ERROR_BAGGAGE_NOT_CREATED, "error while creating baggage object"},
+
+{XP_JAVA_REMOVE_PRINCIPAL_ERROR, "Couldn't remove the principal"},
+
+{XP_JAVA_DELETE_PRIVILEGE_ERROR, "Couldn't delete the privilege"},
+
+{XP_JAVA_CERT_NOT_EXISTS_ERROR, "This principal doesn't have a certificate"},
+
+{SEC_ERROR_BAD_EXPORT_ALGORITHM, "Required algorithm is not allowed."},
+
+{SEC_ERROR_EXPORTING_CERTIFICATES, "Error attempting to export certificates."},
+
+{SEC_ERROR_IMPORTING_CERTIFICATES, "Error attempting to import certificates."},
+
+{SEC_ERROR_PKCS12_DECODING_PFX, "Unable to import.  Decoding error.  File not valid."},
+
+{SEC_ERROR_PKCS12_INVALID_MAC, "Unable to import.  Invalid MAC.  Incorrect password or corrupt file."},
+
+{SEC_ERROR_PKCS12_UNSUPPORTED_MAC_ALGORITHM, "Unable to import.  MAC algorithm not supported."},
+
+{SEC_ERROR_PKCS12_UNSUPPORTED_TRANSPORT_MODE, "Unable to import.  Only password integrity and privacy modes supported."},
+
+{SEC_ERROR_PKCS12_CORRUPT_PFX_STRUCTURE, "Unable to import.  File structure is corrupt."},
+
+{SEC_ERROR_PKCS12_UNSUPPORTED_PBE_ALGORITHM, "Unable to import.  Encryption algorithm not supported."},
+
+{SEC_ERROR_PKCS12_UNSUPPORTED_VERSION, "Unable to import.  File version not supported."},
+
+{SEC_ERROR_PKCS12_PRIVACY_PASSWORD_INCORRECT, "Unable to import.  Incorrect privacy password."},
+
+{SEC_ERROR_PKCS12_CERT_COLLISION, "Unable to import.  Same nickname already exists in database."},
+
+{SEC_ERROR_USER_CANCELLED, "The user pressed cancel."},
+
+{SEC_ERROR_PKCS12_DUPLICATE_DATA, "Not imported, already in database."},
+
+{SEC_ERROR_MESSAGE_SEND_ABORTED, "Message not sent."},
+
+{SEC_ERROR_INADEQUATE_KEY_USAGE, "Certificate key usage inadequate for attempted operation."},
+
+{SEC_ERROR_INADEQUATE_CERT_TYPE, "Certificate type not approved for application."},
+
+{SEC_ERROR_CERT_ADDR_MISMATCH, "Address in signing certificate does not match address in message headers."},
+
+{SEC_ERROR_PKCS12_UNABLE_TO_IMPORT_KEY, "Unable to import.  Error attempting to import private key."},
+
+{SEC_ERROR_PKCS12_IMPORTING_CERT_CHAIN, "Unable to import.  Error attempting to import certificate chain."},
+
+{SEC_ERROR_PKCS12_UNABLE_TO_LOCATE_OBJECT_BY_NAME, "Unable to export.  Unable to locate certificate or key by nickname."},
+
+{SEC_ERROR_PKCS12_UNABLE_TO_EXPORT_KEY, "Unable to export.  Private Key could not be located and exported."},
+
+{SEC_ERROR_PKCS12_UNABLE_TO_WRITE, "Unable to export.  Unable to write the export file."},
+
+{SEC_ERROR_PKCS12_UNABLE_TO_READ, "Unable to import.  Unable to read the import file."},
+
+{SEC_ERROR_PKCS12_KEY_DATABASE_NOT_INITIALIZED, "Unable to export.  Key database corrupt or deleted."},
+
+{SEC_ERROR_KEYGEN_FAIL, "Unable to generate public/private key pair."},
+
+{SEC_ERROR_INVALID_PASSWORD, "Password entered is invalid.  Please pick a different one."},
+
+{SEC_ERROR_RETRY_OLD_PASSWORD, "Old password entered incorrectly.  Please try again."},
+
+{SEC_ERROR_BAD_NICKNAME, "Certificate nickname already in use."},
+
+{SEC_ERROR_NOT_FORTEZZA_ISSUER, "Peer FORTEZZA chain has a non-FORTEZZA Certificate."},
+
+{SEC_ERROR_CANNOT_MOVE_SENSITIVE_KEY, "A sensitive key cannot be moved to the slot where it is needed."},
+
+{SEC_ERROR_JS_INVALID_MODULE_NAME, "Invalid module name."},
+
+{SEC_ERROR_JS_INVALID_DLL, "Invalid module path/filename"},
+
+{SEC_ERROR_JS_ADD_MOD_FAILURE, "Unable to add module"},
+
+{SEC_ERROR_JS_DEL_MOD_FAILURE, "Unable to delete module"},
+
+{SEC_ERROR_OLD_KRL, "New KRL is not later than the current one."},
+
+{SEC_ERROR_CKL_CONFLICT, "New CKL has different issuer than current CKL.  Delete current CKL."},
+
+{SEC_ERROR_CERT_NOT_IN_NAME_SPACE, "The Certifying Authority for this certificate is not permitted to issue a \
+certificate with this name."},
+
+{SEC_ERROR_KRL_NOT_YET_VALID, "The key revocation list for this certificate is not yet valid."},
+
+{SEC_ERROR_CRL_NOT_YET_VALID, "The certificate revocation list for this certificate is not yet valid."},
+
+{SEC_ERROR_UNKNOWN_CERT, "The requested certificate could not be found."},
+
+{SEC_ERROR_UNKNOWN_SIGNER, "The signer's certificate could not be found."},
+
+{SEC_ERROR_CERT_BAD_ACCESS_LOCATION, "The location for the certificate status server has invalid format."},
+
+{SEC_ERROR_OCSP_UNKNOWN_RESPONSE_TYPE, "The OCSP response cannot be fully decoded; it is of an unknown type."},
+
+{SEC_ERROR_OCSP_BAD_HTTP_RESPONSE, "The OCSP server returned unexpected/invalid HTTP data."},
+
+{SEC_ERROR_OCSP_MALFORMED_REQUEST, "The OCSP server found the request to be corrupted or improperly formed."},
+
+{SEC_ERROR_OCSP_SERVER_ERROR, "The OCSP server experienced an internal error."},
+
+{SEC_ERROR_OCSP_TRY_SERVER_LATER, "The OCSP server suggests trying again later."},
+
+{SEC_ERROR_OCSP_REQUEST_NEEDS_SIG, "The OCSP server requires a signature on this request."},
+
+{SEC_ERROR_OCSP_UNAUTHORIZED_REQUEST, "The OCSP server has refused this request as unauthorized."},
+
+{SEC_ERROR_OCSP_UNKNOWN_RESPONSE_STATUS, "The OCSP server returned an unrecognizable status."},
+
+{SEC_ERROR_OCSP_UNKNOWN_CERT, "The OCSP server has no status for the certificate."},
+
+{SEC_ERROR_OCSP_NOT_ENABLED, "You must enable OCSP before performing this operation."},
+
+{SEC_ERROR_OCSP_NO_DEFAULT_RESPONDER, "You must set the OCSP default responder before performing this operation."},
+
+{SEC_ERROR_OCSP_MALFORMED_RESPONSE, "The response from the OCSP server was corrupted or improperly formed."},
+
+{SEC_ERROR_OCSP_UNAUTHORIZED_RESPONSE, "The signer of the OCSP response is not authorized to give status for \
+this certificate."},
+
+{SEC_ERROR_OCSP_FUTURE_RESPONSE, "The OCSP response is not yet valid (contains a date in the future},."},
+
+{SEC_ERROR_OCSP_OLD_RESPONSE, "The OCSP response contains out-of-date information."},
+
+{SEC_ERROR_DIGEST_NOT_FOUND, "The CMS or PKCS #7 Digest was not found in signed message."},
+
+{SEC_ERROR_UNSUPPORTED_MESSAGE_TYPE, "The CMS or PKCS #7 Message type is unsupported."},
+
+{SEC_ERROR_MODULE_STUCK, "PKCS #11 module could not be removed because it is still in use."},
+
+{SEC_ERROR_BAD_TEMPLATE, "Could not decode ASN.1 data. Specified template was invalid."},
+
+{SEC_ERROR_CRL_NOT_FOUND, "No matching CRL was found."},
+
+{SEC_ERROR_REUSED_ISSUER_AND_SERIAL, "You are attempting to import a cert with the same issuer/serial as \
+an existing cert, but that is not the same cert."},
+
+{SEC_ERROR_BUSY, "NSS could not shutdown. Objects are still in use."},
+
+{SEC_ERROR_EXTRA_INPUT, "DER-encoded message contained extra unused data."},
+
+{SEC_ERROR_UNSUPPORTED_ELLIPTIC_CURVE, "Unsupported elliptic curve."},
+
+{SEC_ERROR_UNSUPPORTED_EC_POINT_FORM, "Unsupported elliptic curve point form."},
+
+{SEC_ERROR_UNRECOGNIZED_OID, "Unrecognized Object Identifier."},
+
+{SEC_ERROR_OCSP_INVALID_SIGNING_CERT, "Invalid OCSP signing certificate in OCSP response."},
+
+{SEC_ERROR_REVOKED_CERTIFICATE_CRL, "Certificate is revoked in issuer's certificate revocation list."},
+
+{SEC_ERROR_REVOKED_CERTIFICATE_OCSP, "Issuer's OCSP responder reports certificate is revoked."},
+
+{SEC_ERROR_CRL_INVALID_VERSION, "Issuer's Certificate Revocation List has an unknown version number."},
+
+{SEC_ERROR_CRL_V1_CRITICAL_EXTENSION, "Issuer's V1 Certificate Revocation List has a critical extension."},
+
+{SEC_ERROR_CRL_UNKNOWN_CRITICAL_EXTENSION, "Issuer's V2 Certificate Revocation List has an unknown critical extension."},
+
+{SEC_ERROR_UNKNOWN_OBJECT_TYPE, "Unknown object type specified."},
+
+{SEC_ERROR_INCOMPATIBLE_PKCS11, "PKCS #11 driver violates the spec in an incompatible way."},
+
+{SEC_ERROR_NO_EVENT, "No new slot event is available at this time."},
+
+{SEC_ERROR_CRL_ALREADY_EXISTS, "CRL already exists."},
+
+{SEC_ERROR_NOT_INITIALIZED, "NSS is not initialized."},
+
+{SEC_ERROR_TOKEN_NOT_LOGGED_IN, "The operation failed because the PKCS#11 token is not logged in."},
+
+{SEC_ERROR_OCSP_RESPONDER_CERT_INVALID, "Configured OCSP responder's certificate is invalid."},
+
+{SEC_ERROR_OCSP_BAD_SIGNATURE, "OCSP response has an invalid signature."},
+
+{SEC_ERROR_OUT_OF_SEARCH_LIMITS, "Cert validation search is out of search limits"},
+
+{SEC_ERROR_INVALID_POLICY_MAPPING, "Policy mapping contains anypolicy"},
+
+{SEC_ERROR_POLICY_VALIDATION_FAILED, "Cert chain fails policy validation"},
+
+{SEC_ERROR_UNKNOWN_AIA_LOCATION_TYPE, "Unknown location type in cert AIA extension"},
+
+{SEC_ERROR_BAD_HTTP_RESPONSE, "Server returned bad HTTP response"},
+
+{SEC_ERROR_BAD_LDAP_RESPONSE, "Server returned bad LDAP response"},
+
+{SEC_ERROR_FAILED_TO_ENCODE_DATA, "Failed to encode data with ASN1 encoder"},
+
+{SEC_ERROR_BAD_INFO_ACCESS_LOCATION, "Bad information access location in cert extension"},
+
+{SEC_ERROR_LIBPKIX_INTERNAL, "Libpkix internal error occurred during cert validation."},
+
+#if ( NSS_VMAJOR > 3 ) || ( NSS_VMAJOR == 3 && NSS_VMINOR > 12 ) || ( NSS_VMAJOR == 3 && NSS_VMINOR == 12 && NSS_VPATCH > 2 )
+// following 3 errors got first used in NSS 3.12.3
+// they were in the header even in 3.12.2 but there was missing the mapping in pk11err.c
+// see also https://bugzilla.mozilla.org/show_bug.cgi?id=453364
+
+{SEC_ERROR_PKCS11_GENERAL_ERROR, "A PKCS #11 module returned CKR_GENERAL_ERROR, indicating that an unrecoverable error has occurred."},
+
+{SEC_ERROR_PKCS11_FUNCTION_FAILED, "A PKCS #11 module returned CKR_FUNCTION_FAILED, indicating that the requested function could not be performed.  Trying the same operation again might succeed."},
+
+{SEC_ERROR_PKCS11_DEVICE_ERROR, "A PKCS #11 module returned CKR_DEVICE_ERROR, indicating that a problem has occurred with the token or slot."},
+
+#endif
+
+#if ( NSS_VMAJOR > 3 ) || ( NSS_VMAJOR == 3 && NSS_VMINOR > 12 ) || ( NSS_VMAJOR == 3 && NSS_VMINOR == 12 && NSS_VPATCH > 3 )
+// following 2 errors got added in NSS 3.12.4
+
+{SEC_ERROR_BAD_INFO_ACCESS_METHOD, "Unknown information access method in certificate extension."},
+
+{SEC_ERROR_CRL_IMPORT_FAILED, "Error attempting to import a CRL."},
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/xmlsec/nss/ciphercontext.cxx b/xmlsecurity/source/xmlsec/nss/ciphercontext.cxx
new file mode 100644
index 000000000..104414f81
--- /dev/null
+++ b/xmlsecurity/source/xmlsec/nss/ciphercontext.cxx
@@ -0,0 +1,266 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <sal/config.h>
+
+#include <com/sun/star/lang/DisposedException.hpp>
+#include <osl/diagnose.h>
+#include <rtl/random.h>
+#include <rtl/ref.hxx>
+
+#include "ciphercontext.hxx"
+#include <pk11pub.h>
+
+using namespace ::com::sun::star;
+
+uno::Reference< xml::crypto::XCipherContext > OCipherContext::Create( CK_MECHANISM_TYPE nNSSCipherID, const uno::Sequence< ::sal_Int8 >& aKey, const uno::Sequence< ::sal_Int8 >& aInitializationVector, bool bEncryption, bool bW3CPadding )
+{
+    ::rtl::Reference< OCipherContext > xResult = new OCipherContext;
+
+    xResult->m_pSlot = PK11_GetBestSlot( nNSSCipherID, nullptr );
+    if ( xResult->m_pSlot )
+    {
+        SECItem aKeyItem = { siBuffer, const_cast< unsigned char* >( reinterpret_cast< const unsigned char* >( aKey.getConstArray() ) ), sal::static_int_cast<unsigned>( aKey.getLength() ) };
+        xResult->m_pSymKey = PK11_ImportSymKey( xResult->m_pSlot, nNSSCipherID, PK11_OriginDerive, bEncryption ? CKA_ENCRYPT : CKA_DECRYPT, &aKeyItem, nullptr );
+        if ( xResult->m_pSymKey )
+        {
+            SECItem aIVItem = { siBuffer, const_cast< unsigned char* >( reinterpret_cast< const unsigned char* >( aInitializationVector.getConstArray() ) ), sal::static_int_cast<unsigned>( aInitializationVector.getLength() ) };
+            xResult->m_pSecParam = PK11_ParamFromIV( nNSSCipherID, &aIVItem );
+            if ( xResult->m_pSecParam )
+            {
+                xResult->m_pContext = PK11_CreateContextBySymKey( nNSSCipherID, bEncryption ? CKA_ENCRYPT : CKA_DECRYPT, xResult->m_pSymKey, xResult->m_pSecParam);
+                if ( xResult->m_pContext )
+                {
+                    xResult->m_bEncryption = bEncryption;
+                    xResult->m_bW3CPadding = bW3CPadding;
+                    xResult->m_bPadding = bW3CPadding || ( PK11_GetPadMechanism( nNSSCipherID ) == nNSSCipherID );
+                    xResult->m_nBlockSize = PK11_GetBlockSize( nNSSCipherID, xResult->m_pSecParam );
+                    if ( xResult->m_nBlockSize <= SAL_MAX_INT8 )
+                        return xResult.get();
+                }
+            }
+        }
+    }
+
+    return uno::Reference< xml::crypto::XCipherContext >();
+}
+
+void OCipherContext::Dispose()
+{
+    ::osl::MutexGuard aGuard( m_aMutex );
+
+    if ( m_pContext )
+    {
+        PK11_DestroyContext( m_pContext, PR_TRUE );
+        m_pContext = nullptr;
+    }
+
+    if ( m_pSecParam )
+    {
+        SECITEM_FreeItem( m_pSecParam, PR_TRUE );
+        m_pSecParam = nullptr;
+    }
+
+    if ( m_pSymKey )
+    {
+        PK11_FreeSymKey( m_pSymKey );
+        m_pSymKey = nullptr;
+    }
+
+    if ( m_pSlot )
+    {
+        PK11_FreeSlot( m_pSlot );
+        m_pSlot = nullptr;
+    }
+
+    m_bDisposed = true;
+}
+
+uno::Sequence< ::sal_Int8 > SAL_CALL OCipherContext::convertWithCipherContext( const uno::Sequence< ::sal_Int8 >& aData )
+{
+    ::osl::MutexGuard aGuard( m_aMutex );
+
+    if ( m_bBroken )
+        throw uno::RuntimeException();
+
+    if ( m_bDisposed )
+        throw lang::DisposedException();
+
+    uno::Sequence< sal_Int8 > aToConvert;
+    if ( aData.hasElements() )
+    {
+        sal_Int32 nOldLastBlockLen = m_aLastBlock.getLength();
+        OSL_ENSURE( nOldLastBlockLen <= m_nBlockSize, "Unexpected last block size!" );
+
+        sal_Int32 nAvailableData = nOldLastBlockLen + aData.getLength();
+        sal_Int32 nToConvertLen;
+        if ( m_bEncryption || !m_bW3CPadding )
+        {
+            if ( nAvailableData % m_nBlockSize == 0 )
+                nToConvertLen = nAvailableData;
+            else if ( nAvailableData < m_nBlockSize )
+                nToConvertLen = 0;
+            else
+                nToConvertLen = nAvailableData - nAvailableData % m_nBlockSize;
+        }
+        else
+        {
+            // decryption with W3C padding needs at least one block for finalizing
+            if ( nAvailableData < m_nBlockSize * 2 )
+                nToConvertLen = 0;
+            else
+                nToConvertLen = nAvailableData - nAvailableData % m_nBlockSize - m_nBlockSize;
+        }
+
+        aToConvert.realloc( nToConvertLen );
+        if ( nToConvertLen == 0 )
+        {
+            m_aLastBlock.realloc( nOldLastBlockLen + aData.getLength() );
+            memcpy( m_aLastBlock.getArray() + nOldLastBlockLen, aData.getConstArray(), aData.getLength() );
+            // aToConvert stays empty
+        }
+        else if ( nToConvertLen < nOldLastBlockLen )
+        {
+            memcpy( aToConvert.getArray(), m_aLastBlock.getConstArray(), nToConvertLen );
+            memcpy( m_aLastBlock.getArray(), m_aLastBlock.getConstArray() + nToConvertLen, nOldLastBlockLen - nToConvertLen );
+            m_aLastBlock.realloc( nOldLastBlockLen - nToConvertLen + aData.getLength() );
+            memcpy( m_aLastBlock.getArray() + nOldLastBlockLen - nToConvertLen, aData.getConstArray(), aData.getLength() );
+        }
+        else
+        {
+            memcpy( aToConvert.getArray(), m_aLastBlock.getConstArray(), nOldLastBlockLen );
+            if ( nToConvertLen > nOldLastBlockLen )
+                memcpy( aToConvert.getArray() + nOldLastBlockLen, aData.getConstArray(), nToConvertLen - nOldLastBlockLen );
+            m_aLastBlock.realloc( nAvailableData - nToConvertLen );
+            memcpy( m_aLastBlock.getArray(), aData.getConstArray() + nToConvertLen - nOldLastBlockLen, nAvailableData - nToConvertLen );
+        }
+    }
+
+    uno::Sequence< sal_Int8 > aResult;
+    OSL_ENSURE( aToConvert.getLength() % m_nBlockSize == 0, "Unexpected size of the data to encrypt!" );
+    if ( aToConvert.hasElements() )
+    {
+        int nResultLen = 0;
+        aResult.realloc( aToConvert.getLength() + m_nBlockSize );
+        if ( PK11_CipherOp( m_pContext, reinterpret_cast< unsigned char* >( aResult.getArray() ), &nResultLen, aResult.getLength(), reinterpret_cast< const unsigned char* >( aToConvert.getConstArray() ), aToConvert.getLength() ) != SECSuccess )
+        {
+            m_bBroken = true;
+            Dispose();
+            throw uno::RuntimeException();
+        }
+
+        m_nConverted += aToConvert.getLength();
+        aResult.realloc( nResultLen );
+    }
+
+    return aResult;
+}
+
+uno::Sequence< ::sal_Int8 > SAL_CALL OCipherContext::finalizeCipherContextAndDispose()
+{
+    ::osl::MutexGuard aGuard( m_aMutex );
+
+    if ( m_bBroken )
+        throw uno::RuntimeException();
+
+    if ( m_bDisposed )
+        throw lang::DisposedException();
+
+    OSL_ENSURE( m_nBlockSize <= SAL_MAX_INT8, "Unexpected block size!" );
+    OSL_ENSURE( m_nConverted % m_nBlockSize == 0, "Unexpected amount of bytes is already converted!" );
+    sal_Int32 nSizeForPadding = ( m_nConverted + m_aLastBlock.getLength() ) % m_nBlockSize;
+
+    // if it is decryption, the amount of data should be rounded to the block size even in case of padding
+    if ( ( !m_bPadding || !m_bEncryption ) && nSizeForPadding )
+        throw uno::RuntimeException("The data should contain complete blocks only." );
+
+    if ( m_bW3CPadding && m_bEncryption )
+    {
+        // in this case the last block should be smaller than standard block
+        // it will be increased with the padding
+        OSL_ENSURE( m_aLastBlock.getLength() < m_nBlockSize, "Unexpected size of cashed incomplete last block!" );
+
+        // W3CPadding handling for encryption
+        sal_Int32 nPaddingSize = m_nBlockSize - nSizeForPadding;
+        sal_Int32 nOldLastBlockLen = m_aLastBlock.getLength();
+        m_aLastBlock.realloc( nOldLastBlockLen + nPaddingSize );
+
+        if ( nPaddingSize > 1 )
+        {
+            rtlRandomPool aRandomPool = rtl_random_createPool();
+            rtl_random_getBytes( aRandomPool, m_aLastBlock.getArray() + nOldLastBlockLen, nPaddingSize - 1 );
+            rtl_random_destroyPool ( aRandomPool );
+        }
+        m_aLastBlock[m_aLastBlock.getLength() - 1] = static_cast< sal_Int8 >( nPaddingSize );
+    }
+
+    // finally should the last block be smaller than two standard blocks
+    OSL_ENSURE( m_aLastBlock.getLength() < m_nBlockSize * 2 , "Unexpected size of cashed incomplete last block!" );
+
+    uno::Sequence< sal_Int8 > aResult;
+    if ( m_aLastBlock.hasElements() )
+    {
+        int nPrefResLen = 0;
+        aResult.realloc( m_aLastBlock.getLength() + m_nBlockSize );
+        if ( PK11_CipherOp( m_pContext, reinterpret_cast< unsigned char* >( aResult.getArray() ), &nPrefResLen, aResult.getLength(), reinterpret_cast< const unsigned char* >( m_aLastBlock.getConstArray() ), m_aLastBlock.getLength() ) != SECSuccess )
+        {
+            m_bBroken = true;
+            Dispose();
+            throw uno::RuntimeException();
+        }
+
+        aResult.realloc( nPrefResLen );
+        m_aLastBlock.realloc( 0 );
+    }
+
+    sal_Int32 nPrefixLen = aResult.getLength();
+    aResult.realloc( nPrefixLen + m_nBlockSize * 2 );
+    unsigned nFinalLen = 0;
+    if ( PK11_DigestFinal( m_pContext, reinterpret_cast< unsigned char* >( aResult.getArray() + nPrefixLen ), &nFinalLen, aResult.getLength() - nPrefixLen ) != SECSuccess )
+    {
+        m_bBroken = true;
+        Dispose();
+        throw uno::RuntimeException();
+    }
+
+    aResult.realloc( nPrefixLen + nFinalLen );
+
+    if ( m_bW3CPadding && !m_bEncryption )
+    {
+        // W3CPadding handling for decryption
+        // aResult should have enough data, since we let m_aLastBlock be big enough in case of decryption
+        OSL_ENSURE( aResult.getLength() >= m_nBlockSize, "Not enough data to handle the padding!" );
+
+        sal_Int8 nBytesToRemove = aResult[aResult.getLength() - 1];
+        if ( nBytesToRemove <= 0 || nBytesToRemove > aResult.getLength() )
+        {
+            m_bBroken = true;
+            Dispose();
+            throw uno::RuntimeException();
+        }
+
+        aResult.realloc( aResult.getLength() - nBytesToRemove );
+    }
+
+    Dispose();
+
+    return aResult;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/xmlsec/nss/ciphercontext.hxx b/xmlsecurity/source/xmlsec/nss/ciphercontext.hxx
new file mode 100644
index 000000000..1d4a99c30
--- /dev/null
+++ b/xmlsecurity/source/xmlsec/nss/ciphercontext.hxx
@@ -0,0 +1,83 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#ifndef INCLUDED_XMLSECURITY_SOURCE_XMLSEC_NSS_CIPHERCONTEXT_HXX
+#define INCLUDED_XMLSECURITY_SOURCE_XMLSEC_NSS_CIPHERCONTEXT_HXX
+
+#include <com/sun/star/xml/crypto/XCipherContext.hpp>
+
+#include <cppuhelper/implbase.hxx>
+#include <osl/mutex.hxx>
+#include <seccomon.h>
+#include <secmodt.h>
+
+class OCipherContext : public cppu::WeakImplHelper< css::xml::crypto::XCipherContext >
+{
+private:
+    ::osl::Mutex m_aMutex;
+
+    PK11SlotInfo* m_pSlot;
+    PK11SymKey* m_pSymKey;
+    SECItem* m_pSecParam;
+    PK11Context* m_pContext;
+
+    sal_Int32 m_nBlockSize;
+    css::uno::Sequence< sal_Int8 > m_aLastBlock;
+
+    bool m_bEncryption;
+    bool m_bPadding;
+    bool m_bW3CPadding;
+    sal_Int64 m_nConverted;
+
+    bool m_bDisposed;
+    bool m_bBroken;
+
+    void Dispose();
+
+    OCipherContext()
+    : m_pSlot( nullptr )
+    , m_pSymKey( nullptr )
+    , m_pSecParam( nullptr )
+    , m_pContext( nullptr )
+    , m_nBlockSize( 0 )
+    , m_bEncryption( false )
+    , m_bPadding( false )
+    , m_bW3CPadding( false )
+    , m_nConverted( 0 )
+    , m_bDisposed( false )
+    , m_bBroken( false )
+    {}
+
+public:
+
+    virtual ~OCipherContext() override
+    {
+        Dispose();
+    }
+
+    static css::uno::Reference< css::xml::crypto::XCipherContext > Create( CK_MECHANISM_TYPE nNSSCipherID, const css::uno::Sequence< ::sal_Int8 >& aKey, const css::uno::Sequence< ::sal_Int8 >& aInitializationVector, bool bEncryption, bool bW3CPadding );
+
+    // XCipherContext
+    virtual css::uno::Sequence< ::sal_Int8 > SAL_CALL convertWithCipherContext( const css::uno::Sequence< ::sal_Int8 >& aData ) override;
+    virtual css::uno::Sequence< ::sal_Int8 > SAL_CALL finalizeCipherContextAndDispose(  ) override;
+};
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/xmlsec/nss/digestcontext.cxx b/xmlsecurity/source/xmlsec/nss/digestcontext.cxx
new file mode 100644
index 000000000..40d871ac6
--- /dev/null
+++ b/xmlsecurity/source/xmlsec/nss/digestcontext.cxx
@@ -0,0 +1,94 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <sal/config.h>
+
+#include <com/sun/star/lang/DisposedException.hpp>
+
+#include <pk11pub.h>
+#include "digestcontext.hxx"
+
+using namespace ::com::sun::star;
+
+ODigestContext::~ODigestContext()
+{
+    if ( m_pContext )
+    {
+        PK11_DestroyContext( m_pContext, PR_TRUE );
+        m_pContext = nullptr;
+    }
+}
+
+void SAL_CALL ODigestContext::updateDigest( const uno::Sequence< ::sal_Int8 >& aData )
+{
+    ::osl::MutexGuard aGuard( m_aMutex );
+
+    if ( m_bBroken )
+        throw uno::RuntimeException();
+
+    if ( m_bDisposed )
+        throw lang::DisposedException();
+
+    if ( !m_b1KData || m_nDigested < 1024 )
+    {
+        uno::Sequence< sal_Int8 > aToDigest = aData;
+        if ( m_b1KData && m_nDigested + aData.getLength() > 1024 )
+            aToDigest.realloc( 1024 - m_nDigested );
+
+        if ( PK11_DigestOp( m_pContext, reinterpret_cast< const unsigned char* >( aToDigest.getConstArray() ), aToDigest.getLength() ) != SECSuccess )
+        {
+            PK11_DestroyContext( m_pContext, PR_TRUE );
+            m_pContext = nullptr;
+            m_bBroken = true;
+            throw uno::RuntimeException();
+        }
+
+        m_nDigested += aToDigest.getLength();
+    }
+}
+
+uno::Sequence< ::sal_Int8 > SAL_CALL ODigestContext::finalizeDigestAndDispose()
+{
+    ::osl::MutexGuard aGuard( m_aMutex );
+
+    if ( m_bBroken )
+        throw uno::RuntimeException();
+
+    if ( m_bDisposed )
+        throw lang::DisposedException();
+
+    uno::Sequence< sal_Int8 > aResult( m_nDigestLength );
+    unsigned int nResultLen = 0;
+    if ( PK11_DigestFinal( m_pContext, reinterpret_cast< unsigned char* >( aResult.getArray() ), &nResultLen, aResult.getLength() ) != SECSuccess )
+    {
+        PK11_DestroyContext( m_pContext, PR_TRUE );
+        m_pContext = nullptr;
+        m_bBroken = true;
+        throw uno::RuntimeException();
+    }
+
+    PK11_DestroyContext( m_pContext, PR_TRUE );
+    m_pContext = nullptr;
+    m_bDisposed = true;
+
+    aResult.realloc( nResultLen );
+    return aResult;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/xmlsec/nss/digestcontext.hxx b/xmlsecurity/source/xmlsec/nss/digestcontext.hxx
new file mode 100644
index 000000000..2f41862a8
--- /dev/null
+++ b/xmlsecurity/source/xmlsec/nss/digestcontext.hxx
@@ -0,0 +1,62 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#ifndef INCLUDED_XMLSECURITY_SOURCE_XMLSEC_NSS_DIGESTCONTEXT_HXX
+#define INCLUDED_XMLSECURITY_SOURCE_XMLSEC_NSS_DIGESTCONTEXT_HXX
+
+#include <com/sun/star/xml/crypto/XDigestContext.hpp>
+
+#include <cppuhelper/implbase.hxx>
+#include <osl/mutex.hxx>
+#include <secmodt.h>
+
+class ODigestContext : public cppu::WeakImplHelper< css::xml::crypto::XDigestContext >
+{
+private:
+    ::osl::Mutex m_aMutex;
+
+    PK11Context* m_pContext;
+    sal_Int32 const m_nDigestLength;
+    bool const m_b1KData;
+    sal_Int32 m_nDigested;
+
+    bool m_bDisposed;
+    bool m_bBroken;
+
+public:
+    ODigestContext( PK11Context* pContext, sal_Int32 nDigestLength, bool b1KData )
+    : m_pContext( pContext )
+    , m_nDigestLength( nDigestLength )
+    , m_b1KData( b1KData )
+    , m_nDigested( 0 )
+    , m_bDisposed( false )
+    , m_bBroken( false )
+    {}
+
+    virtual ~ODigestContext() override;
+
+
+    // XDigestContext
+    virtual void SAL_CALL updateDigest( const css::uno::Sequence< ::sal_Int8 >& aData ) override;
+    virtual css::uno::Sequence< ::sal_Int8 > SAL_CALL finalizeDigestAndDispose() override;
+};
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/xmlsec/nss/nssinitializer.cxx b/xmlsecurity/source/xmlsec/nss/nssinitializer.cxx
new file mode 100644
index 000000000..d64ea10a0
--- /dev/null
+++ b/xmlsecurity/source/xmlsec/nss/nssinitializer.cxx
@@ -0,0 +1,524 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <com/sun/star/lang/IllegalArgumentException.hpp>
+#include <com/sun/star/mozilla/XMozillaBootstrap.hpp>
+#include <com/sun/star/xml/crypto/DigestID.hpp>
+#include <com/sun/star/xml/crypto/CipherID.hpp>
+#include <com/sun/star/uno/XComponentContext.hpp>
+#include <cppuhelper/supportsservice.hxx>
+#include <officecfg/Office/Common.hxx>
+#include <sal/types.h>
+#include <rtl/bootstrap.hxx>
+#include <rtl/string.hxx>
+#include <osl/file.hxx>
+#include <osl/thread.h>
+#include <sal/log.hxx>
+#include <tools/diagnose_ex.h>
+#include <unotools/tempfile.hxx>
+#include <salhelper/singletonref.hxx>
+
+#include <nss/nssinitializer.hxx>
+
+#include "digestcontext.hxx"
+#include "ciphercontext.hxx"
+
+#include <memory>
+#include <vector>
+
+#include <nss.h>
+#include <pk11pub.h>
+#include <secmod.h>
+#include <prerror.h>
+#include <prinit.h>
+
+namespace cssu = css::uno;
+namespace cssl = css::lang;
+
+using namespace com::sun::star;
+
+#define ROOT_CERTS "Root Certs for OpenOffice.org"
+
+extern "C" {
+
+static void nsscrypto_finalize();
+
+}
+
+namespace
+{
+
+class InitNSSPrivate
+{
+private:
+    std::unique_ptr<utl::TempFile> m_pTempFileDatabaseDirectory;
+
+public:
+    OUString getTempDatabasePath()
+    {
+        if (!m_pTempFileDatabaseDirectory)
+        {
+            m_pTempFileDatabaseDirectory.reset(new utl::TempFile(nullptr, true));
+            m_pTempFileDatabaseDirectory->EnableKillingFile();
+        }
+        return m_pTempFileDatabaseDirectory->GetFileName();
+    }
+
+    void reset()
+    {
+        if (m_pTempFileDatabaseDirectory)
+        {
+            m_pTempFileDatabaseDirectory.reset();
+        }
+    }
+};
+
+salhelper::SingletonRef<InitNSSPrivate>* getInitNSSPrivate()
+{
+    static salhelper::SingletonRef<InitNSSPrivate> aInitNSSPrivate;
+    return &aInitNSSPrivate;
+}
+
+bool nsscrypto_initialize( const css::uno::Reference< css::uno::XComponentContext > &rxContext, bool & out_nss_init );
+
+#ifdef XMLSEC_CRYPTO_NSS
+
+void deleteRootsModule()
+{
+    SECMODModule *RootsModule = nullptr;
+    SECMODModuleList *list = SECMOD_GetDefaultModuleList();
+    SECMODListLock *lock = SECMOD_GetDefaultModuleListLock();
+    SECMOD_GetReadLock(lock);
+
+    while (!RootsModule && list)
+    {
+        SECMODModule *module = list->module;
+
+        for (int i=0; i < module->slotCount; i++)
+        {
+            PK11SlotInfo *slot = module->slots[i];
+            if (PK11_IsPresent(slot))
+            {
+                if (PK11_HasRootCerts(slot))
+                {
+                    SAL_INFO("xmlsecurity.xmlsec", "The root certificates module \"" << module->commonName << "\" is already loaded: " << module->dllName);
+
+                    RootsModule = SECMOD_ReferenceModule(module);
+                    break;
+                }
+            }
+        }
+        list = list->next;
+    }
+    SECMOD_ReleaseReadLock(lock);
+
+    if (RootsModule)
+    {
+        PRInt32 modType;
+        if (SECSuccess == SECMOD_DeleteModule(RootsModule->commonName, &modType))
+        {
+            SAL_INFO("xmlsecurity.xmlsec", "Deleted module \"" << RootsModule->commonName << "\".");
+        }
+        else
+        {
+            SAL_INFO("xmlsecurity.xmlsec", "Failed to delete \"" << RootsModule->commonName << "\": " << RootsModule->dllName);
+        }
+        SECMOD_DestroyModule(RootsModule);
+        RootsModule = nullptr;
+    }
+}
+
+OString getMozillaCurrentProfile( const css::uno::Reference< css::uno::XComponentContext > &rxContext )
+{
+    // first, try to get the profile from "MOZILLA_CERTIFICATE_FOLDER"
+    const char* pEnv = getenv("MOZILLA_CERTIFICATE_FOLDER");
+    if (pEnv)
+    {
+        SAL_INFO(
+            "xmlsecurity.xmlsec",
+            "Using Mozilla profile from MOZILLA_CERTIFICATE_FOLDER=" << pEnv);
+        return pEnv;
+    }
+
+    // second, try to get saved user-preference
+    try
+    {
+        OUString sUserSetCertPath =
+            officecfg::Office::Common::Security::Scripting::CertDir::get().value_or(OUString());
+
+        if (!sUserSetCertPath.isEmpty())
+        {
+            SAL_INFO(
+                "xmlsecurity.xmlsec",
+                "Using Mozilla profile from /org.openoffice.Office.Common/"
+                    "Security/Scripting/CertDir: " << sUserSetCertPath);
+            return OUStringToOString(sUserSetCertPath, osl_getThreadTextEncoding());
+        }
+    }
+    catch (const uno::Exception &)
+    {
+        TOOLS_WARN_EXCEPTION("xmlsecurity.xmlsec", "getMozillaCurrentProfile:");
+    }
+
+    // third, dig around to see if there's one available
+    mozilla::MozillaProductType productTypes[3] = {
+        mozilla::MozillaProductType_Thunderbird,
+        mozilla::MozillaProductType_Firefox,
+        mozilla::MozillaProductType_Mozilla };
+
+    uno::Reference<uno::XInterface> xInstance = rxContext->getServiceManager()->createInstanceWithContext("com.sun.star.mozilla.MozillaBootstrap", rxContext);
+    OSL_ENSURE( xInstance.is(), "failed to create instance" );
+
+    uno::Reference<mozilla::XMozillaBootstrap> xMozillaBootstrap(xInstance,uno::UNO_QUERY);
+    OSL_ENSURE( xMozillaBootstrap.is(), "failed to create instance" );
+
+    if (xMozillaBootstrap.is())
+    {
+        for (int i=0; i<int(SAL_N_ELEMENTS(productTypes)); ++i)
+        {
+            OUString profile = xMozillaBootstrap->getDefaultProfile(productTypes[i]);
+
+            if (!profile.isEmpty())
+            {
+                OUString sProfilePath = xMozillaBootstrap->getProfilePath( productTypes[i], profile );
+                SAL_INFO(
+                    "xmlsecurity.xmlsec",
+                    "Using Mozilla profile " << sProfilePath);
+                return OUStringToOString(sProfilePath, osl_getThreadTextEncoding());
+            }
+        }
+    }
+
+    SAL_INFO("xmlsecurity.xmlsec", "No Mozilla profile found");
+    return OString();
+}
+
+#endif
+
+//Older versions of Firefox (FF), for example FF2, and Thunderbird (TB) 2 write
+//the roots certificate module (libnssckbi.so), which they use, into the
+//profile. This module will then already be loaded during NSS_Init (and the
+//other init functions). This fails in two cases. First, FF3 was used to create
+//the profile, or possibly used that profile before, and second the profile was
+//used on a different platform.
+//
+//Then one needs to add the roots module oneself. This should be done with
+//SECMOD_LoadUserModule rather than SECMOD_AddNewModule. The latter would write
+//the location of the roots module to the profile, which makes FF2 and TB2 use
+//it instead of their own module.
+//
+//When using SYSTEM_NSS then the libnss3.so lib is typically found in /usr/lib.
+//This folder may, however, NOT contain the roots certificate module. That is,
+//just providing the library name in SECMOD_LoadUserModule or
+//SECMOD_AddNewModule will FAIL to load the mozilla unless the LD_LIBRARY_PATH
+//contains an FF or TB installation.
+//ATTENTION: DO NOT call this function directly instead use initNSS
+//return true - whole initialization was successful
+//param out_nss_init = true: at least the NSS initialization (NSS_InitReadWrite
+//was successful and therefore NSS_Shutdown should be called when terminating.
+bool nsscrypto_initialize(css::uno::Reference<css::uno::XComponentContext> const & rxContext, bool & out_nss_init)
+{
+    // this method must be called only once, no need for additional lock
+    OString sCertDir;
+
+#ifdef XMLSEC_CRYPTO_NSS
+    sCertDir = getMozillaCurrentProfile(rxContext);
+#else
+    (void) rxContext;
+#endif
+    SAL_INFO("xmlsecurity.xmlsec",  "Using profile: " << sCertDir );
+
+    PR_Init( PR_USER_THREAD, PR_PRIORITY_NORMAL, 1 ) ;
+
+    bool bSuccess = false;
+    // there might be no profile
+    if (!sCertDir.isEmpty())
+    {
+        if (sCertDir.indexOf(':') == -1) //might be env var with explicit prefix
+        {
+            OUString sCertDirURL;
+            osl::FileBase::getFileURLFromSystemPath(
+                OStringToOUString(sCertDir, osl_getThreadTextEncoding()),
+                sCertDirURL);
+            osl::DirectoryItem item;
+            if (osl::FileBase::E_NOENT != osl::DirectoryItem::get(sCertDirURL + "/cert8.db", item) &&
+                osl::FileBase::E_NOENT == osl::DirectoryItem::get(sCertDirURL + "/cert9.db", item))
+            {
+                SAL_INFO("xmlsecurity.xmlsec", "nsscrypto_initialize: trying to avoid profile migration");
+                sCertDir = "dbm:" + sCertDir;
+            }
+        }
+        if (NSS_InitReadWrite(sCertDir.getStr()) != SECSuccess)
+        {
+            SAL_INFO("xmlsecurity.xmlsec", "Initializing NSS with profile failed.");
+            int errlen = PR_GetErrorTextLength();
+            if (errlen > 0)
+            {
+                std::unique_ptr<char[]> const error(new char[errlen + 1]);
+                PR_GetErrorText(error.get());
+                SAL_INFO("xmlsecurity.xmlsec", error.get());
+            }
+        }
+        else
+        {
+            bSuccess = true;
+        }
+    }
+
+    if (!bSuccess) // Try to create a database in temp dir
+    {
+        SAL_INFO("xmlsecurity.xmlsec", "Initializing NSS with a temporary profile.");
+        OUString rString = (*getInitNSSPrivate())->getTempDatabasePath();
+
+        if (NSS_InitReadWrite(rString.toUtf8().getStr()) != SECSuccess)
+        {
+            SAL_INFO("xmlsecurity.xmlsec", "Initializing NSS with a temporary profile.");
+            int errlen = PR_GetErrorTextLength();
+            if(errlen > 0)
+            {
+                std::unique_ptr<char[]> const error(new char[errlen + 1]);
+                PR_GetErrorText(error.get());
+                SAL_INFO("xmlsecurity.xmlsec", error.get());
+            }
+            return false;
+        }
+        // Initialize and set empty password if needed
+        PK11SlotInfo* pSlot = PK11_GetInternalKeySlot();
+        if (pSlot)
+        {
+            if (PK11_NeedUserInit(pSlot))
+                PK11_InitPin(pSlot, nullptr, nullptr);
+            PK11_FreeSlot(pSlot);
+        }
+    }
+    out_nss_init = true;
+
+#ifdef XMLSEC_CRYPTO_NSS
+    bool return_value = true;
+
+#if defined SYSTEM_NSS
+    if (!SECMOD_HasRootCerts())
+#endif
+    {
+        deleteRootsModule();
+
+#if defined SYSTEM_NSS
+        OUString rootModule("libnssckbi" SAL_DLLEXTENSION);
+#else
+        OUString rootModule("${LO_LIB_DIR}/libnssckbi" SAL_DLLEXTENSION);
+#endif
+        ::rtl::Bootstrap::expandMacros(rootModule);
+
+        OUString rootModulePath;
+        if (::osl::File::E_None == ::osl::File::getSystemPathFromFileURL(rootModule, rootModulePath))
+        {
+            OString ospath = OUStringToOString(rootModulePath, osl_getThreadTextEncoding());
+            OString aStr = "name=\"" ROOT_CERTS "\" library=\"" + ospath + "\"";
+
+            SECMODModule * RootsModule =
+                SECMOD_LoadUserModule(
+                    const_cast<char*>(aStr.getStr()),
+                    nullptr, // no parent
+                    PR_FALSE); // do not recurse
+
+            if (RootsModule)
+            {
+
+                bool found = RootsModule->loaded;
+
+                SECMOD_DestroyModule(RootsModule);
+                RootsModule = nullptr;
+                if (found)
+                    SAL_INFO("xmlsecurity.xmlsec", "Added new root certificate module " ROOT_CERTS " contained in " << ospath);
+                else
+                {
+                    SAL_INFO("xmlsecurity.xmlsec", "FAILED to load the new root certificate module " ROOT_CERTS "contained in " << ospath);
+                    return_value = false;
+                }
+            }
+            else
+            {
+                SAL_INFO("xmlsecurity.xmlsec", "FAILED to add new root certificate module " ROOT_CERTS  " contained in " << ospath);
+                return_value = false;
+
+            }
+        }
+        else
+        {
+            SAL_INFO("xmlsecurity.xmlsec", "Adding new root certificate module failed.");
+            return_value = false;
+        }
+    }
+
+    return return_value;
+#else
+    return true;
+#endif
+}
+
+} // namespace
+
+// must be extern "C" because we pass the function pointer to atexit
+extern "C" void nsscrypto_finalize()
+{
+    SECMODModule *RootsModule = SECMOD_FindModule(ROOT_CERTS);
+
+    if (RootsModule)
+    {
+
+        if (SECSuccess == SECMOD_UnloadUserModule(RootsModule))
+        {
+            SAL_INFO("xmlsecurity.xmlsec", "Unloaded module \"" ROOT_CERTS "\".");
+        }
+        else
+        {
+            SAL_INFO("xmlsecurity.xmlsec", "Failed unloading module \"" ROOT_CERTS "\".");
+        }
+        SECMOD_DestroyModule(RootsModule);
+    }
+    else
+    {
+        SAL_INFO("xmlsecurity.xmlsec", "Unloading module \"" ROOT_CERTS "\" failed because it was not found.");
+    }
+    PK11_LogoutAll();
+    (void)NSS_Shutdown();
+
+    (*getInitNSSPrivate())->reset();
+}
+
+ONSSInitializer::ONSSInitializer(
+    const css::uno::Reference< css::uno::XComponentContext > &rxContext)
+    :m_xContext( rxContext )
+{
+}
+
+ONSSInitializer::~ONSSInitializer()
+{
+}
+
+bool ONSSInitializer::initNSS( const css::uno::Reference< css::uno::XComponentContext > &rxContext )
+{
+    static bool gbInitialized = [&rxContext]()
+        {
+            bool bNSSInit = false;
+            bool bInitialized = nsscrypto_initialize( rxContext, bNSSInit );
+            if (bNSSInit)
+                atexit(nsscrypto_finalize);
+            return bInitialized;
+        }();
+    return gbInitialized;
+}
+
+css::uno::Reference< css::xml::crypto::XDigestContext > SAL_CALL ONSSInitializer::getDigestContext( ::sal_Int32 nDigestID, const css::uno::Sequence< css::beans::NamedValue >& aParams )
+{
+    SECOidTag nNSSDigestID = SEC_OID_UNKNOWN;
+    sal_Int32 nDigestLength = 0;
+    bool b1KData = false;
+    if ( nDigestID == css::xml::crypto::DigestID::SHA256
+      || nDigestID == css::xml::crypto::DigestID::SHA256_1K )
+    {
+        nNSSDigestID = SEC_OID_SHA256;
+        nDigestLength = 32;
+        b1KData = ( nDigestID == css::xml::crypto::DigestID::SHA256_1K );
+    }
+    else if ( nDigestID == css::xml::crypto::DigestID::SHA1
+           || nDigestID == css::xml::crypto::DigestID::SHA1_1K )
+    {
+        nNSSDigestID = SEC_OID_SHA1;
+        nDigestLength = 20;
+        b1KData = ( nDigestID == css::xml::crypto::DigestID::SHA1_1K );
+    }
+    else if ( nDigestID == css::xml::crypto::DigestID::SHA512
+           || nDigestID == css::xml::crypto::DigestID::SHA512_1K )
+    {
+        nNSSDigestID = SEC_OID_SHA512;
+        nDigestLength = 64;
+        b1KData = ( nDigestID == css::xml::crypto::DigestID::SHA512_1K );
+    }
+    else
+        throw css::lang::IllegalArgumentException("Unexpected digest requested.", css::uno::Reference< css::uno::XInterface >(), 1 );
+
+    if ( aParams.hasElements() )
+        throw css::lang::IllegalArgumentException("Unexpected arguments provided for digest creation.", css::uno::Reference< css::uno::XInterface >(), 2 );
+
+    css::uno::Reference< css::xml::crypto::XDigestContext > xResult;
+    if( initNSS( m_xContext ) )
+    {
+        PK11Context* pContext = PK11_CreateDigestContext( nNSSDigestID );
+        if ( pContext && PK11_DigestBegin( pContext ) == SECSuccess )
+            xResult = new ODigestContext( pContext, nDigestLength, b1KData );
+    }
+
+    return xResult;
+}
+
+css::uno::Reference< css::xml::crypto::XCipherContext > SAL_CALL ONSSInitializer::getCipherContext( ::sal_Int32 nCipherID, const css::uno::Sequence< ::sal_Int8 >& aKey, const css::uno::Sequence< ::sal_Int8 >& aInitializationVector, sal_Bool bEncryption, const css::uno::Sequence< css::beans::NamedValue >& aParams )
+{
+    CK_MECHANISM_TYPE nNSSCipherID = 0;
+    bool bW3CPadding = false;
+    if ( nCipherID != css::xml::crypto::CipherID::AES_CBC_W3C_PADDING )
+        throw css::lang::IllegalArgumentException("Unexpected cipher requested.", css::uno::Reference< css::uno::XInterface >(), 1 );
+
+    nNSSCipherID = CKM_AES_CBC;
+    bW3CPadding = true;
+
+    if ( aKey.getLength() != 16 && aKey.getLength() != 24 && aKey.getLength() != 32 )
+        throw css::lang::IllegalArgumentException("Unexpected key length.", css::uno::Reference< css::uno::XInterface >(), 2 );
+
+    if ( aParams.hasElements() )
+        throw css::lang::IllegalArgumentException("Unexpected arguments provided for cipher creation.", css::uno::Reference< css::uno::XInterface >(), 5 );
+
+    css::uno::Reference< css::xml::crypto::XCipherContext > xResult;
+    if( initNSS( m_xContext ) )
+    {
+        if ( aInitializationVector.getLength() != PK11_GetIVLength( nNSSCipherID ) )
+            throw css::lang::IllegalArgumentException("Unexpected length of initialization vector.", css::uno::Reference< css::uno::XInterface >(), 3 );
+
+        xResult = OCipherContext::Create( nNSSCipherID, aKey, aInitializationVector, bEncryption, bW3CPadding );
+    }
+
+    return xResult;
+}
+
+/* XServiceInfo */
+OUString SAL_CALL ONSSInitializer::getImplementationName()
+{
+    return "com.sun.star.xml.crypto.NSSInitializer";
+}
+
+sal_Bool SAL_CALL ONSSInitializer::supportsService( const OUString& rServiceName )
+{
+    return cppu::supportsService(this, rServiceName);
+}
+
+cssu::Sequence< OUString > SAL_CALL ONSSInitializer::getSupportedServiceNames(  )
+{
+    return { NSS_SERVICE_NAME };
+}
+
+#ifndef XMLSEC_CRYPTO_NSS
+extern "C" SAL_DLLPUBLIC_EXPORT uno::XInterface*
+com_sun_star_xml_crypto_NSSInitializer_get_implementation(
+    uno::XComponentContext* pCtx, uno::Sequence<uno::Any> const& /*rSeq*/)
+{
+    return cppu::acquire(new ONSSInitializer(pCtx));
+}
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/xmlsec/nss/nssinitializer.hxx b/xmlsecurity/source/xmlsec/nss/nssinitializer.hxx
new file mode 100644
index 000000000..7e1b7ff50
--- /dev/null
+++ b/xmlsecurity/source/xmlsec/nss/nssinitializer.hxx
@@ -0,0 +1,66 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#ifndef INCLUDED_XMLSECURITY_SOURCE_XMLSEC_NSS_NSSINITIALIZER_HXX
+#define INCLUDED_XMLSECURITY_SOURCE_XMLSEC_NSS_NSSINITIALIZER_HXX
+
+#include <com/sun/star/xml/crypto/XNSSInitializer.hpp>
+#include <com/sun/star/lang/XServiceInfo.hpp>
+
+#include <cppuhelper/implbase.hxx>
+
+namespace com::sun::star::uno { class XComponentContext; }
+
+#define NSS_SERVICE_NAME "com.sun.star.xml.crypto.NSSInitializer"
+
+class ONSSInitializer : public cppu::WeakImplHelper
+<
+    css::xml::crypto::XNSSInitializer,
+    css::lang::XServiceInfo
+>
+{
+protected:
+    css::uno::Reference< css::uno::XComponentContext > m_xContext;
+
+    ONSSInitializer()
+    {}
+
+public:
+    explicit ONSSInitializer(const css::uno::Reference<css::uno::XComponentContext> &rxContext);
+    virtual ~ONSSInitializer() override;
+
+    static bool initNSS( const css::uno::Reference< css::uno::XComponentContext > &rxContext );
+
+    /* XDigestContextSupplier */
+    virtual css::uno::Reference< css::xml::crypto::XDigestContext > SAL_CALL getDigestContext( ::sal_Int32 nDigestID, const css::uno::Sequence< css::beans::NamedValue >& aParams ) override;
+
+    /* XCipherContextSupplier */
+    virtual css::uno::Reference< css::xml::crypto::XCipherContext > SAL_CALL getCipherContext( ::sal_Int32 nCipherID, const css::uno::Sequence< ::sal_Int8 >& aKey, const css::uno::Sequence< ::sal_Int8 >& aInitializationVector, sal_Bool bEncryption, const css::uno::Sequence< css::beans::NamedValue >& aParams ) override;
+
+    /* XServiceInfo */
+    virtual OUString SAL_CALL getImplementationName() override;
+
+    virtual sal_Bool SAL_CALL supportsService( const OUString& ServiceName ) override;
+
+    virtual css::uno::Sequence< OUString > SAL_CALL getSupportedServiceNames() override;
+};
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/xmlsec/nss/nssrenam.h b/xmlsecurity/source/xmlsec/nss/nssrenam.h
new file mode 100644
index 000000000..411f279e0
--- /dev/null
+++ b/xmlsecurity/source/xmlsec/nss/nssrenam.h
@@ -0,0 +1,44 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * The contents of this file are subject to the Mozilla Public
+ * License Version 1.1 (the "License"); you may not use this file
+ * except in compliance with the License. You may obtain a copy of
+ * the License at http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS
+ * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
+ * implied. See the License for the specific language governing
+ * rights and limitations under the License.
+ *
+ * The Original Code is the Netscape security libraries.
+ *
+ * The Initial Developer of the Original Code is Netscape
+ * Communications Corporation.  Portions created by Netscape are
+ * Copyright (C) 2001 Netscape Communications Corporation.  All
+ * Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * Alternatively, the contents of this file may be used under the
+ * terms of the GNU General Public License Version 2 or later (the
+ * "GPL"), in which case the provisions of the GPL are applicable
+ * instead of those above.  If you wish to allow use of your
+ * version of this file only under the terms of the GPL and not to
+ * allow others to use your version of this file under the MPL,
+ * indicate your decision by deleting the provisions above and
+ * replace them with the notice and other provisions required by
+ * the GPL.  If you do not delete the provisions above, a recipient
+ * may use your version of this file under either the MPL or the
+ * GPL.
+ */
+
+#ifndef INCLUDED_XMLSECURITY_SOURCE_XMLSEC_NSS_NSSRENAM_H
+#define INCLUDED_XMLSECURITY_SOURCE_XMLSEC_NSS_NSSRENAM_H
+
+#define CERT_NewTempCertificate __CERT_NewTempCertificate
+#define PK11_GetKeyData __PK11_GetKeyData
+#define CERT_DecodeDERCertificate __CERT_DecodeDERCertificate
+
+#endif // INCLUDED_XMLSECURITY_SOURCE_XMLSEC_NSS_NSSRENAM_H
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/xmlsec/nss/sanextension_nssimpl.cxx b/xmlsecurity/source/xmlsec/nss/sanextension_nssimpl.cxx
new file mode 100644
index 000000000..5827c5f92
--- /dev/null
+++ b/xmlsecurity/source/xmlsec/nss/sanextension_nssimpl.cxx
@@ -0,0 +1,162 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <sal/config.h>
+#include <rtl/ustring.hxx>
+#include <com/sun/star/security/ExtAltNameType.hpp>
+#include <com/sun/star/security/CertAltNameEntry.hpp>
+#include <com/sun/star/beans/PropertyValue.hpp>
+#include <comphelper/sequence.hxx>
+#include <seccomon.h>
+#include <cert.h>
+#include <certt.h>
+
+#include "sanextension_nssimpl.hxx"
+
+using namespace ::com::sun::star;
+using namespace ::com::sun::star::uno ;
+using namespace ::com::sun::star::security ;
+
+namespace {
+    // Helper functions from nss/lib/certdb/genname.c
+    int GetNamesLength(CERTGeneralName *names)
+    {
+        int              length = 0;
+        CERTGeneralName  *first;
+
+        first = names;
+        if (names != nullptr) {
+            do {
+                length++;
+                names = CERT_GetNextGeneralName(names);
+            } while (names != first);
+        }
+        return length;
+    }
+
+}
+
+//Methods from XSanExtension
+css::uno::Sequence< css::security::CertAltNameEntry > SAL_CALL SanExtensionImpl::getAlternativeNames()
+{
+    if (m_Entries.empty())
+    {
+        SECItem item;
+
+        item.type = siDERCertBuffer;
+        item.data = reinterpret_cast<unsigned char*>(m_Extn.m_xExtnValue.getArray());
+        item.len = m_Extn.m_xExtnValue.getLength();
+
+        PRArenaPool *arena;
+        CERTGeneralName *nameList;
+        arena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE);
+
+        if (!arena)
+            return css::uno::Sequence<css::security::CertAltNameEntry>();
+
+        nameList = CERT_DecodeAltNameExtension(arena, &item);
+
+        CERTGeneralName* current = nameList;
+
+        int size = GetNamesLength(nameList);
+        m_Entries.resize(size);
+        for(int i = 0; i < size; ++i){
+            switch (current->type) {
+                case certOtherName: {
+                    m_Entries[i].Type = ExtAltNameType_OTHER_NAME;
+                    css::beans::PropertyValue otherNameProp;
+                    otherNameProp.Name = OUString::createFromAscii(CERT_GetOidString(&current->name.OthName.oid));
+
+                    Sequence< sal_Int8 > otherName( current->name.OthName.name.len ) ;
+                    for( unsigned int r = 0; r < current->name.OthName.name.len ; r ++ )
+                        otherName[r] = *( current->name.OthName.name.data + r ) ;
+
+                    otherNameProp.Value <<= otherName;
+
+                    m_Entries[i].Value <<= otherNameProp;
+                    break;
+                                    }
+                case certRFC822Name:
+                    m_Entries[i].Type = ExtAltNameType_RFC822_NAME;
+                    m_Entries[i].Value <<= OUString(reinterpret_cast<char*>(current->name.other.data), current->name.other.len, RTL_TEXTENCODING_ASCII_US);
+                    break;
+                case certDNSName:
+                    m_Entries[i].Type = ExtAltNameType_DNS_NAME;
+                    m_Entries[i].Value <<= OUString(reinterpret_cast<char*>(current->name.other.data), current->name.other.len, RTL_TEXTENCODING_ASCII_US);
+                    break;
+                case certX400Address: {
+                    // unsupported
+                    m_Entries[i].Type = ExtAltNameType_X400_ADDRESS;
+                    break;
+                                      }
+                case certDirectoryName: {
+                    // unsupported
+                    m_Entries[i].Type = ExtAltNameType_DIRECTORY_NAME;
+                    break;
+                                        }
+                case certEDIPartyName:  {
+                    // unsupported
+                    m_Entries[i].Type = ExtAltNameType_EDI_PARTY_NAME;
+                    break;
+                                        }
+                case certURI:
+                    m_Entries[i].Type = ExtAltNameType_URL;
+                    m_Entries[i].Value <<= OUString(reinterpret_cast<char*>(current->name.other.data), current->name.other.len, RTL_TEXTENCODING_ASCII_US);
+                    break;
+                case certIPAddress: {
+                    m_Entries[i].Type = ExtAltNameType_IP_ADDRESS;
+
+                    Sequence< sal_Int8 > ipAddress( current->name.other.len ) ;
+                    for( unsigned int r = 0; r < current->name.other.len ; r ++ )
+                        ipAddress[r] = *( current->name.other.data + r ) ;
+
+                    m_Entries[i].Value <<= ipAddress;
+                    break;
+                                    }
+                case certRegisterID:
+                    m_Entries[i].Type = ExtAltNameType_REGISTERED_ID;
+
+
+                    OString nssOid(CERT_GetOidString(&current->name.other));
+                    OString unoOid = removeOIDFromString(nssOid);
+                    m_Entries[i].Value <<= OStringToOUString( unoOid, RTL_TEXTENCODING_ASCII_US );
+                    break;
+            }
+            current = CERT_GetNextGeneralName(current);
+        }
+
+        PORT_FreeArena(arena, PR_FALSE);
+    }
+
+    return comphelper::containerToSequence<css::security::CertAltNameEntry>(m_Entries);
+}
+
+OString SanExtensionImpl::removeOIDFromString( const OString &oidString)
+{
+    OString objID;
+    OString oid("OID.");
+    if (oidString.match(oid))
+        objID = oidString.copy(oid.getLength());
+    else
+        objID = oidString;
+    return objID;
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/xmlsec/nss/sanextension_nssimpl.hxx b/xmlsecurity/source/xmlsec/nss/sanextension_nssimpl.hxx
new file mode 100644
index 000000000..857aa6cc4
--- /dev/null
+++ b/xmlsecurity/source/xmlsec/nss/sanextension_nssimpl.hxx
@@ -0,0 +1,68 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#ifndef INCLUDED_XMLSECURITY_SOURCE_XMLSEC_NSS_SANEXTENSION_NSSIMPL_HXX
+#define INCLUDED_XMLSECURITY_SOURCE_XMLSEC_NSS_SANEXTENSION_NSSIMPL_HXX
+
+#include <sal/config.h>
+#include <cppuhelper/implbase.hxx>
+#include <com/sun/star/security/XSanExtension.hpp>
+#include <com/sun/star/security/CertAltNameEntry.hpp>
+#include <certificateextension_certextn.hxx>
+#include <vector>
+
+class SanExtensionImpl : public ::cppu::WeakImplHelper<
+    css::security::XSanExtension >
+{
+    private:
+        CertificateExtension_CertExtn m_Extn;
+        std::vector<css::security::CertAltNameEntry> m_Entries;
+
+        static OString removeOIDFromString( const OString &oid);
+
+    public:
+        //Methods from XCertificateExtension
+        virtual sal_Bool SAL_CALL isCritical() override
+        {
+            return m_Extn.m_critical;
+        }
+
+        virtual css::uno::Sequence< sal_Int8 > SAL_CALL getExtensionId() override
+        {
+            return m_Extn.m_xExtnId;
+        }
+
+        virtual css::uno::Sequence< sal_Int8 > SAL_CALL getExtensionValue() override
+        {
+            return m_Extn.m_xExtnValue;
+        }
+
+        void setCertExtn(unsigned char const * value, unsigned int vlen, unsigned char const * id, unsigned int idlen, bool critical)
+        {
+            m_Extn.setCertExtn(value, vlen, id, idlen, critical);
+        }
+
+        //Methods from XSanExtension
+
+        virtual css::uno::Sequence< css::security::CertAltNameEntry > SAL_CALL getAlternativeNames() override ;
+} ;
+
+#endif // INCLUDED_XMLSECURITY_SOURCE_XMLSEC_NSS_SANEXTENSION_NSSIMPL_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/xmlsec/nss/secerror.cxx b/xmlsecurity/source/xmlsec/nss/secerror.cxx
new file mode 100644
index 000000000..b7e623ce0
--- /dev/null
+++ b/xmlsecurity/source/xmlsec/nss/secerror.cxx
@@ -0,0 +1,152 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+
+#include <secerr.h>
+#include "secerror.hxx"
+#include <nss.h>
+#include <certt.h>
+#include <sal/log.hxx>
+
+namespace {
+
+struct ErrDesc {
+    PRErrorCode const errNum;
+    const char * errString;
+};
+
+}
+
+const ErrDesc allDesc[] = {
+
+#include "certerrors.h"
+
+};
+
+
+/* Returns a UTF-8 encoded constant error string for "errNum".
+ * Returns NULL of errNum is unknown.
+ */
+const char *
+getCertError(PRErrorCode errNum)
+{
+    for (const ErrDesc& i : allDesc)
+    {
+        if (i.errNum == errNum)
+            return i.errString;
+    }
+
+    return "";
+}
+
+void
+printChainFailure(CERTVerifyLog *log)
+{
+    unsigned int       depth  = static_cast<unsigned int>(-1);
+    CERTVerifyLogNode *node   = nullptr;
+
+    if (log->count > 0)
+    {
+        SAL_INFO("xmlsecurity.xmlsec", "Bad certification path:");
+        unsigned long errorFlags  = 0;
+        for (node = log->head; node; node = node->next)
+        {
+            if (depth != node->depth)
+            {
+                depth = node->depth;
+                SAL_INFO("xmlsecurity.xmlsec", "Certificate:  " << depth <<
+                         node->cert->subjectName << ": " <<
+                         (depth ? "[Certificate Authority]": ""));
+            }
+            SAL_INFO("xmlsecurity.xmlsec", "  ERROR " << node->error << ": " <<
+                     getCertError(node->error));
+            const char * specificError = nullptr;
+            const char * issuer = nullptr;
+            switch (node->error)
+            {
+            case SEC_ERROR_INADEQUATE_KEY_USAGE:
+                errorFlags = reinterpret_cast<unsigned long>(node->arg);
+                switch (errorFlags)
+                {
+                case KU_DIGITAL_SIGNATURE:
+                    specificError = "Certificate cannot sign.";
+                    break;
+                case KU_KEY_ENCIPHERMENT:
+                    specificError = "Certificate cannot encrypt.";
+                    break;
+                case KU_KEY_CERT_SIGN:
+                    specificError = "Certificate cannot sign other certs.";
+                    break;
+                default:
+                    specificError = "[unknown usage].";
+                    break;
+                }
+                break;
+            case SEC_ERROR_INADEQUATE_CERT_TYPE:
+                errorFlags = reinterpret_cast<unsigned long>(node->arg);
+                switch (errorFlags)
+                {
+                case NS_CERT_TYPE_SSL_CLIENT:
+                case NS_CERT_TYPE_SSL_SERVER:
+                    specificError = "Certificate cannot be used for SSL.";
+                    break;
+                case NS_CERT_TYPE_SSL_CA:
+                    specificError = "Certificate cannot be used as an SSL CA.";
+                    break;
+                case NS_CERT_TYPE_EMAIL:
+                    specificError = "Certificate cannot be used for SMIME.";
+                    break;
+                case NS_CERT_TYPE_EMAIL_CA:
+                    specificError = "Certificate cannot be used as an SMIME CA.";
+                    break;
+                case NS_CERT_TYPE_OBJECT_SIGNING:
+                    specificError = "Certificate cannot be used for object signing.";
+                    break;
+                case NS_CERT_TYPE_OBJECT_SIGNING_CA:
+                    specificError = "Certificate cannot be used as an object signing CA.";
+                    break;
+                default:
+                    specificError = "[unknown usage].";
+                    break;
+                }
+                break;
+            case SEC_ERROR_UNKNOWN_ISSUER:
+                specificError = "Unknown issuer:";
+                issuer = node->cert->issuerName;
+                break;
+            case SEC_ERROR_UNTRUSTED_ISSUER:
+                specificError = "Untrusted issuer:";
+                issuer = node->cert->issuerName;
+                break;
+            case SEC_ERROR_EXPIRED_ISSUER_CERTIFICATE:
+                specificError = "Expired issuer certificate:";
+                issuer = node->cert->issuerName;
+                break;
+            default:
+                break;
+            }
+            if (specificError)
+                SAL_INFO("xmlsecurity.xmlsec", specificError);
+            if (issuer)
+                SAL_INFO("xmlsecurity.xmlsec", issuer);
+        }
+    }
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/xmlsec/nss/secerror.hxx b/xmlsecurity/source/xmlsec/nss/secerror.hxx
new file mode 100644
index 000000000..9de7f5af7
--- /dev/null
+++ b/xmlsecurity/source/xmlsec/nss/secerror.hxx
@@ -0,0 +1,35 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#ifndef INCLUDED_XMLSECURITY_SOURCE_XMLSEC_NSS_SECERROR_HXX
+#define INCLUDED_XMLSECURITY_SOURCE_XMLSEC_NSS_SECERROR_HXX
+
+#include <sal/config.h>
+
+#include <certt.h>
+#include <prerror.h>
+
+const char *
+getCertError(PRErrorCode errNum);
+
+void
+printChainFailure(CERTVerifyLog *log);
+#endif // INCLUDED_XMLSECURITY_SOURCE_XMLSEC_NSS_SECERROR_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/xmlsec/nss/securityenvironment_nssimpl.cxx b/xmlsecurity/source/xmlsec/nss/securityenvironment_nssimpl.cxx
new file mode 100644
index 000000000..5b0291642
--- /dev/null
+++ b/xmlsecurity/source/xmlsec/nss/securityenvironment_nssimpl.cxx
@@ -0,0 +1,937 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include "nssrenam.h"
+#include <cert.h>
+#include <secerr.h>
+#include <ocsp.h>
+
+#include <sal/config.h>
+#include <sal/macros.h>
+#include <osl/diagnose.h>
+#include "securityenvironment_nssimpl.hxx"
+#include <cppuhelper/supportsservice.hxx>
+#include <comphelper/servicehelper.hxx>
+
+#include <xmlsec-wrapper.h>
+
+#include <rtl/ustrbuf.hxx>
+#include <comphelper/processfactory.hxx>
+#include <comphelper/docpasswordrequest.hxx>
+#include <sal/log.hxx>
+#include <com/sun/star/task/InteractionHandler.hpp>
+#include <vector>
+#include <memory>
+#include <osl/thread.h>
+#include <comphelper/sequence.hxx>
+
+#include "x509certificate_nssimpl.hxx"
+#include "secerror.hxx"
+#include <prerror.h>
+#include <keyhi.h>
+
+// added for password exception
+#include <com/sun/star/security/NoPasswordException.hpp>
+#include <com/sun/star/security/CertificateCharacters.hpp>
+#include <com/sun/star/security/CertificateValidity.hpp>
+
+namespace csss = ::com::sun::star::security;
+using namespace ::com::sun::star::security;
+using namespace com::sun::star;
+using namespace ::com::sun::star::uno ;
+using namespace ::com::sun::star::lang ;
+
+using ::com::sun::star::xml::crypto::XSecurityEnvironment ;
+using ::com::sun::star::security::XCertificate ;
+
+namespace std
+{
+template <> struct default_delete<PRArenaPool>
+{
+    void operator()(PRArenaPool* ptr) { PORT_FreeArena(ptr, PR_FALSE); }
+};
+}
+
+static X509Certificate_NssImpl* NssCertToXCert( CERTCertificate* cert ) ;
+static X509Certificate_NssImpl* NssPrivKeyToXCert( SECKEYPrivateKey* ) ;
+
+namespace {
+
+struct UsageDescription
+{
+    SECCertificateUsage usage;
+    char const* description;
+
+    UsageDescription()
+    : usage( certificateUsageCheckAllUsages )
+    , description( nullptr )
+    {}
+
+    UsageDescription( SECCertificateUsage i_usage, char const* i_description )
+    : usage( i_usage )
+    , description( i_description )
+    {}
+};
+
+}
+
+static char* GetPasswordFunction( PK11SlotInfo* pSlot, PRBool bRetry, void* /*arg*/ )
+{
+    uno::Reference< uno::XComponentContext > xContext( ::comphelper::getProcessComponentContext() );
+    uno::Reference < task::XInteractionHandler2 > xInteractionHandler(
+        task::InteractionHandler::createWithParent(xContext, nullptr) );
+
+    task::PasswordRequestMode eMode = bRetry ? task::PasswordRequestMode_PASSWORD_REENTER : task::PasswordRequestMode_PASSWORD_ENTER;
+    ::comphelper::DocPasswordRequest* pPasswordRequest = new ::comphelper::DocPasswordRequest(
+        ::comphelper::DocPasswordRequestType::Standard, eMode, OUString::createFromAscii(PK11_GetTokenName(pSlot)) );
+
+    uno::Reference< task::XInteractionRequest > xRequest( pPasswordRequest );
+    xInteractionHandler->handle( xRequest );
+
+    if ( pPasswordRequest->isPassword() )
+    {
+        OString aPassword(OUStringToOString(
+            pPasswordRequest->getPassword(),
+            osl_getThreadTextEncoding()));
+        sal_Int32 nLen = aPassword.getLength();
+        char* pPassword = static_cast<char*>(PORT_Alloc( nLen+1 ) );
+        pPassword[nLen] = 0;
+        memcpy( pPassword, aPassword.getStr(), nLen );
+        return pPassword;
+    }
+    return nullptr;
+}
+
+SecurityEnvironment_NssImpl::SecurityEnvironment_NssImpl() :
+m_pHandler( nullptr ) , m_tSymKeyList() {
+    PK11_SetPasswordFunc( GetPasswordFunction ) ;
+}
+
+SecurityEnvironment_NssImpl::~SecurityEnvironment_NssImpl() {
+
+    PK11_SetPasswordFunc( nullptr ) ;
+
+    for (auto& slot : m_Slots)
+    {
+        PK11_FreeSlot(slot);
+    }
+
+    for( auto& symKey : m_tSymKeyList )
+        PK11_FreeSymKey( symKey ) ;
+}
+
+/* XServiceInfo */
+OUString SAL_CALL SecurityEnvironment_NssImpl::getImplementationName() {
+    return "com.sun.star.xml.crypto.SecurityEnvironment";
+}
+
+/* XServiceInfo */
+sal_Bool SAL_CALL SecurityEnvironment_NssImpl::supportsService( const OUString& serviceName) {
+    return cppu::supportsService(this, serviceName);
+}
+
+/* XServiceInfo */
+Sequence< OUString > SAL_CALL SecurityEnvironment_NssImpl::getSupportedServiceNames() {
+    Sequence<OUString> seqServiceNames{ "com.sun.star.xml.crypto.SecurityEnvironment" };
+    return seqServiceNames;
+}
+
+/* XUnoTunnel */
+sal_Int64 SAL_CALL SecurityEnvironment_NssImpl::getSomething( const Sequence< sal_Int8 >& aIdentifier )
+{
+    if( isUnoTunnelId<SecurityEnvironment_NssImpl>(aIdentifier) ) {
+        return sal::static_int_cast<sal_Int64>(reinterpret_cast<sal_uIntPtr>(this));
+    }
+    return 0 ;
+}
+
+/* XUnoTunnel extension */
+
+namespace
+{
+    class theSecurityEnvironment_NssImplUnoTunnelId  : public rtl::Static< UnoTunnelIdInit, theSecurityEnvironment_NssImplUnoTunnelId > {};
+}
+
+const Sequence< sal_Int8>& SecurityEnvironment_NssImpl::getUnoTunnelId() {
+    return theSecurityEnvironment_NssImplUnoTunnelId::get().getSeq();
+}
+
+OUString SecurityEnvironment_NssImpl::getSecurityEnvironmentInformation()
+{
+    OUStringBuffer buff;
+    for (auto& slot : m_Slots)
+    {
+        buff.append(OUString::createFromAscii(PK11_GetTokenName(slot)));
+        buff.append("\n");
+    }
+    return buff.makeStringAndClear();
+}
+
+void SecurityEnvironment_NssImpl::addCryptoSlot( PK11SlotInfo* aSlot)
+{
+    PK11_ReferenceSlot(aSlot);
+    m_Slots.push_back(aSlot);
+}
+
+//Could we have multiple cert dbs?
+void SecurityEnvironment_NssImpl::setCertDb( CERTCertDBHandle* aCertDb ) {
+    m_pHandler = aCertDb ;
+}
+
+void SecurityEnvironment_NssImpl::adoptSymKey( PK11SymKey* aSymKey ) {
+    if( aSymKey != nullptr ) {
+        //First try to find the key in the list
+        if (std::find(m_tSymKeyList.begin(), m_tSymKeyList.end(), aSymKey) != m_tSymKeyList.end())
+            return;
+
+        //If we do not find the key in the list, add a new node
+        PK11SymKey* symkey = PK11_ReferenceSymKey( aSymKey ) ;
+        if( symkey == nullptr )
+            throw RuntimeException() ;
+
+        try {
+            m_tSymKeyList.push_back( symkey ) ;
+        } catch ( Exception& ) {
+            PK11_FreeSymKey( symkey ) ;
+        }
+    }
+}
+
+void SecurityEnvironment_NssImpl::updateSlots()
+{
+    //In case new tokens are present then we can obtain the corresponding slot
+    osl::MutexGuard guard(m_mutex);
+
+    m_Slots.clear();
+    m_tSymKeyList.clear();
+
+    PK11SlotList * soltList = PK11_GetAllTokens( CKM_INVALID_MECHANISM, PR_FALSE, PR_FALSE, nullptr ) ;
+    if( soltList != nullptr )
+    {
+        for (PK11SlotListElement* soltEle = soltList->head ; soltEle != nullptr; soltEle = soltEle->next)
+        {
+            PK11SlotInfo * pSlot = soltEle->slot ;
+
+            if(pSlot != nullptr)
+            {
+                SAL_INFO(
+                    "xmlsecurity.xmlsec",
+                    "Found a slot: SlotName=" << PK11_GetSlotName(pSlot)
+                        << ", TokenName=" << PK11_GetTokenName(pSlot));
+
+//The following code which is commented out checks if a slot, that is a smart card for example, is
+//              able to generate a symmetric key of type CKM_DES3_CBC. If this fails then this token
+//              will not be used. This key is possibly used for the encryption service. However, all
+//              interfaces and services used for public key signature and encryption are not published
+//              and the encryption is not used in OOo. Therefore it does not do any harm to remove
+//              this code, hence allowing smart cards which cannot generate this type of key.
+//
+//              By doing this, the encryption may fail if a smart card is being used which does not
+//              support this key generation.
+//
+                PK11SymKey * pSymKey = PK11_KeyGen( pSlot , CKM_DES3_CBC, nullptr, 128, nullptr ) ;
+//              if( pSymKey == NULL )
+//              {
+//                  PK11_FreeSlot( pSlot ) ;
+//                  SAL_INFO( "xmlsecurity", "XMLSEC: Error - pSymKey is NULL" );
+//                  continue;
+//              }
+                addCryptoSlot(pSlot);
+                PK11_FreeSlot( pSlot ) ;
+                pSlot = nullptr;
+
+                if (pSymKey != nullptr)
+                {
+                    adoptSymKey( pSymKey ) ;
+                    PK11_FreeSymKey( pSymKey ) ;
+                    pSymKey = nullptr;
+                }
+
+            }// end of if(pSlot != NULL)
+        }// end of for
+    }// end of if( soltList != NULL )
+}
+
+Sequence< Reference < XCertificate > >
+SecurityEnvironment_NssImpl::getPersonalCertificates()
+{
+    sal_Int32 length ;
+    X509Certificate_NssImpl* xcert ;
+    std::vector< X509Certificate_NssImpl* > certsList ;
+
+    updateSlots();
+    //firstly, we try to find private keys in slot
+    for (auto& slot : m_Slots)
+    {
+        SECKEYPrivateKeyList* priKeyList ;
+
+        if( PK11_NeedLogin(slot ) ) {
+            SECStatus nRet = PK11_Authenticate(slot, PR_TRUE, nullptr);
+            //PK11_Authenticate may fail in case the a slot has not been initialized.
+            //this is the case if the user has a new profile, so that they have never
+            //added a personal certificate.
+            if( nRet != SECSuccess && PORT_GetError() != SEC_ERROR_IO) {
+                throw NoPasswordException();
+            }
+        }
+
+        priKeyList = PK11_ListPrivateKeysInSlot(slot) ;
+        if( priKeyList != nullptr )
+        {
+            for (SECKEYPrivateKeyListNode* curPri = PRIVKEY_LIST_HEAD(priKeyList);
+                !PRIVKEY_LIST_END( curPri, priKeyList ) && curPri != nullptr;
+                curPri = PRIVKEY_LIST_NEXT(curPri))
+            {
+                xcert = NssPrivKeyToXCert( curPri->key ) ;
+                if( xcert != nullptr )
+                    certsList.push_back( xcert ) ;
+            }
+            SECKEY_DestroyPrivateKeyList( priKeyList ) ;
+        }
+
+
+    }
+
+    length = certsList.size() ;
+    if( length != 0 ) {
+        int i = 0;
+        Sequence< Reference< XCertificate > > certSeq( length ) ;
+
+        for( const auto& rXCert : certsList ) {
+            certSeq[i] = rXCert ;
+            ++i;
+        }
+
+        return certSeq ;
+    }
+
+    return Sequence< Reference < XCertificate > > ();
+}
+
+Reference< XCertificate > SecurityEnvironment_NssImpl::getCertificate( const OUString& issuerName, const Sequence< sal_Int8 >& serialNumber )
+{
+    X509Certificate_NssImpl* xcert = nullptr;
+
+    if( m_pHandler != nullptr ) {
+        CERTIssuerAndSN issuerAndSN ;
+        CERTCertificate* cert ;
+        CERTName* nmIssuer ;
+        char* chIssuer ;
+        SECItem* derIssuer ;
+        std::unique_ptr<PRArenaPool> arena(PORT_NewArena(DER_DEFAULT_CHUNKSIZE));
+        if( arena == nullptr )
+            throw RuntimeException() ;
+
+        // Create cert info from issue and serial
+        OString ostr = OUStringToOString( issuerName , RTL_TEXTENCODING_UTF8 ) ;
+        chIssuer = PL_strndup( ostr.getStr(), static_cast<int>(ostr.getLength()) ) ;
+        nmIssuer = CERT_AsciiToName( chIssuer ) ;
+        if( nmIssuer == nullptr ) {
+            PL_strfree( chIssuer ) ;
+            return nullptr; // no need for exception cf. i40394
+        }
+
+        derIssuer = SEC_ASN1EncodeItem( arena.get(), nullptr, static_cast<void*>(nmIssuer), SEC_ASN1_GET( CERT_NameTemplate ) ) ;
+        if( derIssuer == nullptr ) {
+            PL_strfree( chIssuer ) ;
+            CERT_DestroyName( nmIssuer ) ;
+            throw RuntimeException() ;
+        }
+
+        memset( &issuerAndSN, 0, sizeof( issuerAndSN ) ) ;
+
+        issuerAndSN.derIssuer.data = derIssuer->data ;
+        issuerAndSN.derIssuer.len = derIssuer->len ;
+
+        issuerAndSN.serialNumber.data = reinterpret_cast<unsigned char *>(const_cast<sal_Int8 *>(serialNumber.getConstArray()));
+        issuerAndSN.serialNumber.len = serialNumber.getLength() ;
+
+        cert = CERT_FindCertByIssuerAndSN( m_pHandler, &issuerAndSN ) ;
+        if( cert != nullptr ) {
+            xcert = NssCertToXCert( cert ) ;
+        } else {
+            xcert = nullptr ;
+        }
+
+        PL_strfree( chIssuer ) ;
+        CERT_DestroyName( nmIssuer ) ;
+        //SECITEM_FreeItem( derIssuer, PR_FALSE ) ;
+        CERT_DestroyCertificate( cert ) ;
+    } else {
+        xcert = nullptr ;
+    }
+
+    return xcert ;
+}
+
+Sequence< Reference < XCertificate > > SecurityEnvironment_NssImpl::buildCertificatePath( const Reference< XCertificate >& begin ) {
+    // Remember the signing certificate.
+    m_xSigningCertificate = begin;
+
+    const X509Certificate_NssImpl* xcert ;
+    const CERTCertificate* cert ;
+    CERTCertList* certChain ;
+
+    Reference< XUnoTunnel > xCertTunnel( begin, UNO_QUERY_THROW ) ;
+    xcert = reinterpret_cast<X509Certificate_NssImpl*>(
+        sal::static_int_cast<sal_uIntPtr>(xCertTunnel->getSomething( X509Certificate_NssImpl::getUnoTunnelId() ))) ;
+    if( xcert == nullptr ) {
+        throw RuntimeException() ;
+    }
+
+    cert = xcert->getNssCert() ;
+    if( cert != nullptr ) {
+        int64 timeboundary ;
+
+        //Get the system clock time
+        timeboundary = PR_Now() ;
+
+        certChain = CERT_GetCertChainFromCert( const_cast<CERTCertificate*>(cert), timeboundary, certUsageAnyCA ) ;
+    } else {
+        certChain = nullptr ;
+    }
+
+    if( certChain != nullptr ) {
+        std::vector<uno::Reference<security::XCertificate>> aCertChain;
+
+        for (CERTCertListNode* node = CERT_LIST_HEAD(certChain); !CERT_LIST_END(node, certChain); node = CERT_LIST_NEXT(node)) {
+            X509Certificate_NssImpl* pCert = new X509Certificate_NssImpl();
+            if( pCert == nullptr ) {
+                CERT_DestroyCertList( certChain ) ;
+                throw RuntimeException() ;
+            }
+
+            pCert->setCert( node->cert ) ;
+
+            aCertChain.push_back(pCert);
+        }
+
+        CERT_DestroyCertList( certChain ) ;
+
+        return comphelper::containerToSequence(aCertChain);
+    }
+
+    return Sequence< Reference < XCertificate > >();
+}
+
+X509Certificate_NssImpl* SecurityEnvironment_NssImpl::createAndAddCertificateFromPackage(
+                                                        const css::uno::Sequence<sal_Int8>& raDERCertificate,
+                                                        OUString const & raString)
+{
+    auto pCertificateBytes = reinterpret_cast<char *>(const_cast<sal_Int8 *>(raDERCertificate.getConstArray()));
+    CERTCertificate* pCERTCertificate = CERT_DecodeCertFromPackage(pCertificateBytes, raDERCertificate.getLength());
+
+    if (!pCERTCertificate)
+        return nullptr;
+
+    SECStatus aStatus;
+
+    OString aTrustString = OUStringToOString(raString, RTL_TEXTENCODING_ASCII_US);
+    CERTCertTrust aTrust;
+
+    aStatus = CERT_DecodeTrustString(&aTrust, aTrustString.getStr());
+
+    if (aStatus != SECSuccess)
+        return nullptr;
+
+    PK11SlotInfo* pSlot = PK11_GetInternalKeySlot();
+
+    if (!pSlot)
+        return nullptr;
+
+    aStatus = PK11_ImportCert(pSlot, pCERTCertificate, CK_INVALID_HANDLE, nullptr, PR_FALSE);
+
+    if (aStatus != SECSuccess)
+        return nullptr;
+
+    aStatus = CERT_ChangeCertTrust(CERT_GetDefaultCertDB(), pCERTCertificate, &aTrust);
+
+    if (aStatus != SECSuccess)
+        return nullptr;
+
+
+    PK11_FreeSlot(pSlot);
+
+    X509Certificate_NssImpl* pX509Certificate = new X509Certificate_NssImpl();
+    pX509Certificate->setCert(pCERTCertificate);
+    return pX509Certificate;
+}
+
+X509Certificate_NssImpl* SecurityEnvironment_NssImpl::createX509CertificateFromDER(const css::uno::Sequence<sal_Int8>& aDerCertificate)
+{
+    X509Certificate_NssImpl* pX509Certificate = nullptr;
+
+    if (aDerCertificate.hasElements())
+    {
+        pX509Certificate = new X509Certificate_NssImpl();
+        if (pX509Certificate == nullptr)
+            throw RuntimeException();
+        pX509Certificate->setRawCert(aDerCertificate);
+    }
+    return pX509Certificate;
+}
+
+Reference<XCertificate> SecurityEnvironment_NssImpl::createCertificateFromRaw(const Sequence< sal_Int8 >& rawCertificate)
+{
+    return createX509CertificateFromDER(rawCertificate);
+}
+
+Reference< XCertificate > SecurityEnvironment_NssImpl::createCertificateFromAscii( const OUString& asciiCertificate )
+{
+    OString oscert = OUStringToOString( asciiCertificate , RTL_TEXTENCODING_ASCII_US ) ;
+    xmlChar* chCert = xmlStrndup( reinterpret_cast<const xmlChar*>(oscert.getStr()), static_cast<int>(oscert.getLength()) ) ;
+    int certSize = xmlSecBase64Decode( chCert, reinterpret_cast<xmlSecByte*>(chCert), xmlStrlen( chCert ) ) ;
+    if (certSize > 0)
+    {
+        Sequence< sal_Int8 > rawCert(certSize) ;
+        for (int i = 0 ; i < certSize; ++i)
+            rawCert[i] = *( chCert + i ) ;
+
+        xmlFree( chCert ) ;
+
+        return createCertificateFromRaw( rawCert ) ;
+    }
+    else
+    {
+        return nullptr;
+    }
+}
+
+sal_Int32 SecurityEnvironment_NssImpl ::
+verifyCertificate( const Reference< csss::XCertificate >& aCert,
+                   const Sequence< Reference< csss::XCertificate > >&  intermediateCerts )
+{
+    sal_Int32 validity = csss::CertificateValidity::INVALID;
+    const X509Certificate_NssImpl* xcert ;
+    const CERTCertificate* cert ;
+    ::std::vector<CERTCertificate*> vecTmpNSSCertificates;
+    Reference< XUnoTunnel > xCertTunnel( aCert, UNO_QUERY_THROW ) ;
+
+    SAL_INFO("xmlsecurity.xmlsec", "Start verification of certificate: " << aCert->getSubjectName());
+
+    xcert = reinterpret_cast<X509Certificate_NssImpl*>(
+       sal::static_int_cast<sal_uIntPtr>(xCertTunnel->getSomething( X509Certificate_NssImpl::getUnoTunnelId() ))) ;
+    if( xcert == nullptr ) {
+        throw RuntimeException() ;
+    }
+
+    //CERT_PKIXVerifyCert does not take a db as argument. It will therefore
+    //internally use CERT_GetDefaultCertDB
+    //Make sure m_pHandler is the default DB
+    OSL_ASSERT(m_pHandler == CERT_GetDefaultCertDB());
+    CERTCertDBHandle * certDb = m_pHandler != nullptr ? m_pHandler : CERT_GetDefaultCertDB();
+    cert = xcert->getNssCert() ;
+    if( cert != nullptr )
+    {
+
+        //prepare the intermediate certificates
+        for (const auto& rIntermediateCert : intermediateCerts)
+        {
+            Sequence<sal_Int8> der = rIntermediateCert->getEncoded();
+            SECItem item;
+            item.type = siBuffer;
+            item.data = reinterpret_cast<unsigned char*>(der.getArray());
+            item.len = der.getLength();
+
+            CERTCertificate* certTmp = CERT_NewTempCertificate(certDb, &item,
+                                           nullptr     /* nickname */,
+                                           PR_FALSE /* isPerm */,
+                                           PR_TRUE  /* copyDER */);
+            if (!certTmp)
+            {
+                 SAL_INFO("xmlsecurity.xmlsec", "Failed to add a temporary certificate: " << rIntermediateCert->getIssuerName());
+
+            }
+            else
+            {
+                 SAL_INFO("xmlsecurity.xmlsec", "Added temporary certificate: " <<
+                          (certTmp->subjectName ? certTmp->subjectName : ""));
+                 vecTmpNSSCertificates.push_back(certTmp);
+            }
+        }
+
+
+        SECStatus status ;
+
+        CERTVerifyLog log;
+        log.arena = PORT_NewArena(512);
+        log.head = log.tail = nullptr;
+        log.count = 0;
+
+        CERT_EnableOCSPChecking(certDb);
+        CERT_DisableOCSPDefaultResponder(certDb);
+        CERTValOutParam cvout[5];
+        CERTValInParam cvin[3];
+        int ncvinCount=0;
+
+#if ( NSS_VMAJOR > 3 ) || ( NSS_VMAJOR == 3 && NSS_VMINOR > 12 ) || ( NSS_VMAJOR == 3 && NSS_VMINOR == 12 && NSS_VPATCH > 0 )
+        cvin[ncvinCount].type = cert_pi_useAIACertFetch;
+        cvin[ncvinCount].value.scalar.b = PR_TRUE;
+        ncvinCount++;
+#endif
+
+        PRUint64 revFlagsLeaf[2];
+        PRUint64 revFlagsChain[2];
+        CERTRevocationFlags rev;
+        rev.leafTests.number_of_defined_methods = 2;
+        rev.leafTests.cert_rev_flags_per_method = revFlagsLeaf;
+        //the flags are defined in cert.h
+        //We check both leaf and chain.
+        //It is enough if one revocation method has fresh info,
+        //but at least one must have some. Otherwise validation fails.
+        //!!! using leaf test and CERT_REV_MI_REQUIRE_SOME_FRESH_INFO_AVAILABLE
+        // when validating a root certificate will result in "revoked". Usually
+        //there is no revocation information available for the root cert because
+        //it must be trusted anyway and it does itself issue revocation information.
+        //When we use the flag here and OOo shows the certification path then the root
+        //cert is invalid while all other can be valid. It would probably best if
+        //this interface method returned the whole chain.
+        //Otherwise we need to check if the certificate is self-signed and if it is
+        //then not use the flag when doing the leaf-test.
+        rev.leafTests.cert_rev_flags_per_method[cert_revocation_method_crl] =
+            CERT_REV_M_TEST_USING_THIS_METHOD
+            | CERT_REV_M_IGNORE_IMPLICIT_DEFAULT_SOURCE;
+        rev.leafTests.cert_rev_flags_per_method[cert_revocation_method_ocsp] =
+            CERT_REV_M_TEST_USING_THIS_METHOD
+            | CERT_REV_M_IGNORE_IMPLICIT_DEFAULT_SOURCE;
+        rev.leafTests.number_of_preferred_methods = 0;
+        rev.leafTests.preferred_methods = nullptr;
+        rev.leafTests.cert_rev_method_independent_flags =
+            CERT_REV_MI_TEST_ALL_LOCAL_INFORMATION_FIRST;
+
+        rev.chainTests.number_of_defined_methods = 2;
+        rev.chainTests.cert_rev_flags_per_method = revFlagsChain;
+        rev.chainTests.cert_rev_flags_per_method[cert_revocation_method_crl] =
+            CERT_REV_M_TEST_USING_THIS_METHOD
+            | CERT_REV_M_IGNORE_IMPLICIT_DEFAULT_SOURCE;
+        rev.chainTests.cert_rev_flags_per_method[cert_revocation_method_ocsp] =
+            CERT_REV_M_TEST_USING_THIS_METHOD
+            | CERT_REV_M_IGNORE_IMPLICIT_DEFAULT_SOURCE;
+        rev.chainTests.number_of_preferred_methods = 0;
+        rev.chainTests.preferred_methods = nullptr;
+        rev.chainTests.cert_rev_method_independent_flags =
+            CERT_REV_MI_TEST_ALL_LOCAL_INFORMATION_FIRST;
+
+
+        cvin[ncvinCount].type = cert_pi_revocationFlags;
+        cvin[ncvinCount].value.pointer.revocation = &rev;
+        ncvinCount++;
+        // does not work, not implemented yet in 3.12.4
+//         cvin[ncvinCount].type = cert_pi_keyusage;
+//         cvin[ncvinCount].value.scalar.ui = KU_DIGITAL_SIGNATURE;
+//         ncvinCount++;
+        cvin[ncvinCount].type = cert_pi_end;
+
+        cvout[0].type = cert_po_trustAnchor;
+        cvout[0].value.pointer.cert = nullptr;
+        cvout[1].type = cert_po_errorLog;
+        cvout[1].value.pointer.log = &log;
+        cvout[2].type = cert_po_end;
+
+        // We check SSL server certificates, CA certificates and signing certificates.
+        //
+        // ToDo check keyusage, looking at CERT_KeyUsageAndTypeForCertUsage (
+        // mozilla/security/nss/lib/certdb/certdb.c indicates that
+        // certificateUsageSSLClient, certificateUsageSSLServer and certificateUsageSSLCA
+        // are sufficient. They cover the key usages for digital signature, key agreement
+        // and encipherment and certificate signature
+
+        //never use the following usages because they are not checked properly
+        // certificateUsageUserCertImport
+        // certificateUsageVerifyCA
+        // certificateUsageAnyCA
+        // certificateUsageProtectedObjectSigner
+
+        UsageDescription arUsages[5];
+        arUsages[0] = UsageDescription( certificateUsageSSLClient, "certificateUsageSSLClient"  );
+        arUsages[1] = UsageDescription( certificateUsageSSLServer, "certificateUsageSSLServer"  );
+        arUsages[2] = UsageDescription( certificateUsageSSLCA, "certificateUsageSSLCA"  );
+        arUsages[3] = UsageDescription( certificateUsageEmailSigner, "certificateUsageEmailSigner" );
+        arUsages[4] = UsageDescription( certificateUsageEmailRecipient, "certificateUsageEmailRecipient" );
+
+        int numUsages = SAL_N_ELEMENTS(arUsages);
+        for (int i = 0; i < numUsages; i++)
+        {
+            SAL_INFO("xmlsecurity.xmlsec", "Testing usage " << i+1 <<
+                     " of " << numUsages << ": " <<
+                     arUsages[i].description <<
+                     " (0x" << std::hex << static_cast<int>(arUsages[i].usage) << ")" << std::dec);
+
+            status = CERT_PKIXVerifyCert(const_cast<CERTCertificate *>(cert), arUsages[i].usage,
+                                         cvin, cvout, nullptr);
+            if( status == SECSuccess )
+            {
+                SAL_INFO("xmlsecurity.xmlsec", "CERT_PKIXVerifyCert returned SECSuccess.");
+                //When an intermediate or root certificate is checked then we expect the usage
+                //certificateUsageSSLCA. This, however, will be only set when in the trust settings dialog
+                //the button "This certificate can identify websites" is checked. If for example only
+                //"This certificate can identify mail users" is set then the end certificate can
+                //be validated and the returned usage will contain certificateUsageEmailRecipient.
+                //But checking directly the root or intermediate certificate will fail. In the
+                //certificate path view the end certificate will be shown as valid but the others
+                //will be displayed as invalid.
+
+                validity = csss::CertificateValidity::VALID;
+                SAL_INFO("xmlsecurity.xmlsec", "Certificate is valid.");
+                CERTCertificate * issuerCert = cvout[0].value.pointer.cert;
+                if (issuerCert)
+                {
+                    SAL_INFO("xmlsecurity.xmlsec", "Root certificate: " << issuerCert->subjectName);
+                    CERT_DestroyCertificate(issuerCert);
+                };
+
+                break;
+            }
+            else
+            {
+                PRIntn err = PR_GetError();
+                SAL_INFO("xmlsecurity.xmlsec", "Error: " <<  err << ": " << getCertError(err));
+
+                /* Display validation results */
+                if ( log.count > 0)
+                {
+                    CERTVerifyLogNode *node = nullptr;
+                    printChainFailure(&log);
+
+                    for (node = log.head; node; node = node->next) {
+                        if (node->cert)
+                            CERT_DestroyCertificate(node->cert);
+                    }
+                    log.head = log.tail = nullptr;
+                    log.count = 0;
+                }
+                SAL_INFO("xmlsecurity.xmlsec", "Certificate is invalid.");
+            }
+        }
+
+    }
+    else
+    {
+        validity = css::security::CertificateValidity::INVALID ;
+    }
+
+    //Destroying the temporary certificates
+    for (auto& tmpCert : vecTmpNSSCertificates)
+    {
+        SAL_INFO("xmlsecurity.xmlsec", "Destroying temporary certificate");
+        CERT_DestroyCertificate(tmpCert);
+    }
+    return validity ;
+}
+
+sal_Int32 SecurityEnvironment_NssImpl::getCertificateCharacters(
+    const css::uno::Reference< css::security::XCertificate >& aCert ) {
+    sal_Int32 characters ;
+    const X509Certificate_NssImpl* xcert ;
+    const CERTCertificate* cert ;
+
+    Reference< XUnoTunnel > xCertTunnel( aCert, UNO_QUERY_THROW ) ;
+    xcert = reinterpret_cast<X509Certificate_NssImpl*>(
+        sal::static_int_cast<sal_uIntPtr>(xCertTunnel->getSomething( X509Certificate_NssImpl::getUnoTunnelId() ))) ;
+    if( xcert == nullptr ) {
+        throw RuntimeException() ;
+    }
+
+    cert = xcert->getNssCert() ;
+
+    characters = 0x00000000 ;
+
+    //Firstly, find out whether or not the cert is self-signed.
+    if( SECITEM_CompareItem( &(cert->derIssuer), &(cert->derSubject) ) == SECEqual ) {
+        characters |= css::security::CertificateCharacters::SELF_SIGNED ;
+    } else {
+        characters &= ~ css::security::CertificateCharacters::SELF_SIGNED ;
+    }
+
+    //Secondly, find out whether or not the cert has a private key.
+
+    /*
+     * i40394
+     *
+     * mmi : need to check whether the cert's slot is valid first
+     */
+    SECKEYPrivateKey* priKey = nullptr;
+
+    if (cert->slot != nullptr)
+    {
+        priKey = PK11_FindPrivateKeyFromCert( cert->slot, const_cast<CERTCertificate*>(cert), nullptr ) ;
+    }
+    if(priKey == nullptr)
+    {
+        for (auto& slot : m_Slots)
+        {
+            priKey = PK11_FindPrivateKeyFromCert(slot, const_cast<CERTCertificate*>(cert), nullptr);
+            if (priKey)
+                break;
+        }
+    }
+    if( priKey != nullptr ) {
+        characters |=  css::security::CertificateCharacters::HAS_PRIVATE_KEY ;
+
+        SECKEY_DestroyPrivateKey( priKey ) ;
+    } else {
+        characters &= ~ css::security::CertificateCharacters::HAS_PRIVATE_KEY ;
+    }
+
+    return characters ;
+}
+
+X509Certificate_NssImpl* NssCertToXCert( CERTCertificate* cert )
+{
+    X509Certificate_NssImpl* xcert ;
+
+    if( cert != nullptr ) {
+        xcert = new X509Certificate_NssImpl() ;
+        xcert->setCert( cert ) ;
+    } else {
+        xcert = nullptr ;
+    }
+
+    return xcert ;
+}
+
+X509Certificate_NssImpl* NssPrivKeyToXCert( SECKEYPrivateKey* priKey )
+{
+    X509Certificate_NssImpl* xcert ;
+
+    if( priKey != nullptr ) {
+        CERTCertificate* cert = PK11_GetCertFromPrivateKey( priKey ) ;
+
+        if( cert != nullptr ) {
+            xcert = NssCertToXCert( cert ) ;
+        } else {
+            xcert = nullptr ;
+        }
+
+        CERT_DestroyCertificate( cert ) ;
+    } else {
+        xcert = nullptr ;
+    }
+
+    return xcert ;
+}
+
+xmlSecKeysMngrPtr SecurityEnvironment_NssImpl::createKeysManager() {
+
+    /*-
+     * The following lines is based on the private version of xmlSec-NSS
+     * crypto engine
+     */
+    int cSlots = m_Slots.size();
+    std::unique_ptr<PK11SlotInfo*[]> sarSlots(new PK11SlotInfo*[cSlots]);
+    PK11SlotInfo**  slots = sarSlots.get();
+    int count = 0;
+    for (const auto& slot : m_Slots)
+    {
+        slots[count] = slot;
+        ++count;
+    }
+
+    xmlSecKeysMngrPtr pKeysMngr = xmlSecKeysMngrCreate();
+    if (!pKeysMngr)
+        throw RuntimeException();
+
+    if (xmlSecNssAppDefaultKeysMngrInit(pKeysMngr) < 0)
+        throw RuntimeException();
+
+    // Adopt the private key of the signing certificate, if it has any.
+    if (auto pCertificate = dynamic_cast<X509Certificate_NssImpl*>(m_xSigningCertificate.get()))
+    {
+        SECKEYPrivateKey* pPrivateKey = SECKEY_CopyPrivateKey(pCertificate->getPrivateKey());
+        if (pPrivateKey)
+        {
+            xmlSecKeyDataPtr pKeyData = xmlSecNssPKIAdoptKey(pPrivateKey, nullptr);
+            xmlSecKeyPtr pKey = xmlSecKeyCreate();
+            xmlSecKeySetValue(pKey, pKeyData);
+            xmlSecNssAppDefaultKeysMngrAdoptKey(pKeysMngr, pKey);
+        }
+        else
+        {
+            SAL_WARN("xmlsecurity.xmlsec", "Can't get the private key from the certificate.");
+        }
+    }
+
+    return pKeysMngr;
+}
+
+void SecurityEnvironment_NssImpl::destroyKeysManager(xmlSecKeysMngrPtr pKeysMngr) {
+    if( pKeysMngr != nullptr ) {
+        xmlSecKeysMngrDestroy( pKeysMngr ) ;
+    }
+}
+
+SECKEYPrivateKey* SecurityEnvironment_NssImpl::insertPrivateKey(css::uno::Sequence<sal_Int8> const & raPrivateKey)
+{
+    PK11SlotInfo* pSlot = PK11_GetInternalKeySlot();
+
+    if (!pSlot)
+        return nullptr;
+
+    SECItem aDerPrivateKeyInfo;
+    aDerPrivateKeyInfo.data = reinterpret_cast<unsigned char *>(const_cast<sal_Int8 *>(raPrivateKey.getConstArray()));
+    aDerPrivateKeyInfo.len = raPrivateKey.getLength();
+
+    const unsigned int aKeyUsage = KU_ALL;
+    SECKEYPrivateKey* pPrivateKey = nullptr;
+
+    bool bPermanent = PR_FALSE;
+    bool bPrivate = PR_TRUE;
+
+    SECStatus nStatus = PK11_ImportDERPrivateKeyInfoAndReturnKey(
+          pSlot, &aDerPrivateKeyInfo, nullptr, nullptr, bPermanent, bPrivate,
+          aKeyUsage, &pPrivateKey, nullptr);
+
+    if (nStatus != SECSuccess)
+        return nullptr;
+
+    PK11_FreeSlot(pSlot);
+
+    return pPrivateKey;
+}
+
+uno::Reference<security::XCertificate> SecurityEnvironment_NssImpl::createDERCertificateWithPrivateKey(
+        Sequence<sal_Int8> const & raDERCertificate, Sequence<sal_Int8> const & raPrivateKey)
+{
+    SECKEYPrivateKey* pPrivateKey = insertPrivateKey(raPrivateKey);
+
+    if (!pPrivateKey)
+        return uno::Reference<security::XCertificate>();
+
+    X509Certificate_NssImpl* pX509Certificate = createAndAddCertificateFromPackage(raDERCertificate, "TCu,TCu,TCu");
+    if (!pX509Certificate)
+        return uno::Reference<security::XCertificate>();
+
+    return pX509Certificate;
+}
+
+uno::Reference<security::XCertificate> SecurityEnvironment_NssImpl::addDERCertificateToTheDatabase(
+        uno::Sequence<sal_Int8> const & raDERCertificate, OUString const & raTrustString)
+{
+    X509Certificate_NssImpl* pX509Certificate = createAndAddCertificateFromPackage(raDERCertificate, raTrustString);
+    return pX509Certificate;
+}
+
+extern "C" SAL_DLLPUBLIC_EXPORT uno::XInterface*
+com_sun_star_xml_crypto_SecurityEnvironment_get_implementation(
+    uno::XComponentContext* /*pCtx*/, uno::Sequence<uno::Any> const& /*rSeq*/)
+{
+    return cppu::acquire(new SecurityEnvironment_NssImpl);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/xmlsec/nss/securityenvironment_nssimpl.hxx b/xmlsecurity/source/xmlsec/nss/securityenvironment_nssimpl.hxx
new file mode 100644
index 000000000..117e2c294
--- /dev/null
+++ b/xmlsecurity/source/xmlsec/nss/securityenvironment_nssimpl.hxx
@@ -0,0 +1,146 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#ifndef INCLUDED_XMLSECURITY_SOURCE_XMLSEC_NSS_SECURITYENVIRONMENT_NSSIMPL_HXX
+#define INCLUDED_XMLSECURITY_SOURCE_XMLSEC_NSS_SECURITYENVIRONMENT_NSSIMPL_HXX
+
+#include <sal/config.h>
+#include <rtl/ustring.hxx>
+#include <cppuhelper/implbase.hxx>
+
+#include <com/sun/star/uno/Reference.hxx>
+
+#include <com/sun/star/lang/XServiceInfo.hpp>
+#include <com/sun/star/xml/crypto/XSecurityEnvironment.hpp>
+#include <com/sun/star/xml/crypto/XCertificateCreator.hpp>
+#include <com/sun/star/lang/XUnoTunnel.hpp>
+
+#include <osl/mutex.hxx>
+
+#include <keythi.h>
+#include <certt.h>
+#include <vector>
+
+#include <xmlsec-wrapper.h>
+
+namespace com::sun::star::security { class XCertificate; }
+class X509Certificate_NssImpl;
+
+class SecurityEnvironment_NssImpl : public ::cppu::WeakImplHelper<
+    css::xml::crypto::XSecurityEnvironment,
+    css::xml::crypto::XCertificateCreator,
+    css::lang::XServiceInfo,
+    css::lang::XUnoTunnel >
+{
+private:
+
+    std::vector< PK11SlotInfo* > m_Slots;
+    /// The last used certificate which has the private key for signing.
+    css::uno::Reference<css::security::XCertificate> m_xSigningCertificate;
+
+    osl::Mutex m_mutex;
+
+        CERTCertDBHandle*                   m_pHandler ;
+        std::vector< PK11SymKey* >          m_tSymKeyList ;
+
+    public:
+        SecurityEnvironment_NssImpl();
+        virtual ~SecurityEnvironment_NssImpl() override;
+
+        //Methods from XSecurityEnvironment
+
+        //Methods from XServiceInfo
+        virtual OUString SAL_CALL getImplementationName() override ;
+
+        virtual sal_Bool SAL_CALL supportsService(
+            const OUString& ServiceName
+        ) override ;
+
+        virtual css::uno::Sequence< OUString > SAL_CALL getSupportedServiceNames() override ;
+
+        virtual ::sal_Int32 SAL_CALL verifyCertificate(
+            const css::uno::Reference<
+            css::security::XCertificate >& xCert,
+            const css::uno::Sequence<
+            css::uno::Reference< css::security::XCertificate > > &
+            intermediateCerts) override ;
+
+        virtual ::sal_Int32 SAL_CALL getCertificateCharacters( const css::uno::Reference< css::security::XCertificate >& xCert ) override ;
+
+        virtual OUString SAL_CALL getSecurityEnvironmentInformation(  ) override;
+
+        //Methods from XUnoTunnel
+        virtual sal_Int64 SAL_CALL getSomething( const css::uno::Sequence< sal_Int8 >& aIdentifier ) override;
+
+        static const css::uno::Sequence< sal_Int8 >& getUnoTunnelId() ;
+
+        /// @throws css::uno::Exception
+        /// @throws css::uno::RuntimeException
+        void setCertDb( CERTCertDBHandle* aCertDb ) ;
+
+        /// @throws css::uno::Exception
+        /// @throws css::uno::RuntimeException
+        void adoptSymKey( PK11SymKey* aSymKey ) ;
+
+        virtual css::uno::Sequence< css::uno::Reference< css::security::XCertificate > > SAL_CALL getPersonalCertificates() override ;
+        virtual css::uno::Sequence< css::uno::Reference< css::security::XCertificate > > SAL_CALL getAllCertificates() override
+        { return css::uno::Sequence< css::uno::Reference< css::security::XCertificate > >(); }
+
+        virtual css::uno::Reference< css::security::XCertificate > SAL_CALL getCertificate( const OUString& issuerName, const css::uno::Sequence< sal_Int8 >& serialNumber ) override ;
+
+        virtual css::uno::Sequence< css::uno::Reference< css::security::XCertificate > > SAL_CALL buildCertificatePath( const css::uno::Reference< css::security::XCertificate >& beginCert ) override ;
+
+        virtual css::uno::Reference< css::security::XCertificate > SAL_CALL createCertificateFromRaw( const css::uno::Sequence< sal_Int8 >& rawCertificate ) override ;
+        virtual css::uno::Reference< css::security::XCertificate > SAL_CALL createCertificateFromAscii( const OUString& asciiCertificate ) override ;
+
+        // Methods of XCertificateCreator
+        css::uno::Reference<css::security::XCertificate> SAL_CALL addDERCertificateToTheDatabase(
+                css::uno::Sequence<sal_Int8> const & raDERCertificate,
+                OUString const & raTrustString) override;
+
+        css::uno::Reference<css::security::XCertificate> SAL_CALL createDERCertificateWithPrivateKey(
+                css::uno::Sequence<sal_Int8> const & raDERCertificate,
+                css::uno::Sequence<sal_Int8> const & raPrivateKey) override;
+
+        //Native methods
+        /// @throws css::uno::RuntimeException
+        xmlSecKeysMngrPtr createKeysManager() ;
+        /// @throws css::uno::Exception
+        /// @throws css::uno::RuntimeException
+        static void destroyKeysManager(xmlSecKeysMngrPtr pKeysMngr) ;
+
+private:
+
+        void updateSlots();
+
+        static X509Certificate_NssImpl* createAndAddCertificateFromPackage(
+                                    const css::uno::Sequence<sal_Int8>& raDerCertificate,
+                                    OUString const & raString);
+        static SECKEYPrivateKey* insertPrivateKey(css::uno::Sequence<sal_Int8> const & raPrivateKey);
+
+        static X509Certificate_NssImpl* createX509CertificateFromDER(const css::uno::Sequence<sal_Int8>& raDerCertificate);
+
+          /// @throws css::uno::Exception
+          /// @throws css::uno::RuntimeException
+          void addCryptoSlot( PK11SlotInfo* aSlot ) ;
+} ;
+
+#endif // INCLUDED_XMLSECURITY_SOURCE_XMLSEC_NSS_SECURITYENVIRONMENT_NSSIMPL_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/xmlsec/nss/seinitializer_nssimpl.cxx b/xmlsecurity/source/xmlsec/nss/seinitializer_nssimpl.cxx
new file mode 100644
index 000000000..3e59efa48
--- /dev/null
+++ b/xmlsecurity/source/xmlsec/nss/seinitializer_nssimpl.cxx
@@ -0,0 +1,145 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <sal/types.h>
+#include <com/sun/star/xml/crypto/SecurityEnvironment.hpp>
+#include <com/sun/star/xml/crypto/XMLSecurityContext.hpp>
+#include <cppuhelper/supportsservice.hxx>
+
+#include "seinitializer_nssimpl.hxx"
+#include "securityenvironment_nssimpl.hxx"
+
+#include <cert.h>
+
+
+using namespace com::sun::star;
+
+
+SEInitializer_NssImpl::SEInitializer_NssImpl( const css::uno::Reference< css::uno::XComponentContext > &rxContext )
+{
+    m_xContext = rxContext;
+}
+
+SEInitializer_NssImpl::~SEInitializer_NssImpl()
+{
+}
+
+/* XSEInitializer */
+uno::Reference< css::xml::crypto::XXMLSecurityContext > SAL_CALL
+    SEInitializer_NssImpl::createSecurityContext( const OUString& )
+{
+    CERTCertDBHandle    *pCertHandle = nullptr ;
+
+    if( !initNSS( m_xContext ) )
+        return nullptr;
+
+    pCertHandle = CERT_GetDefaultCertDB() ;
+
+    try
+    {
+        /* Build XML Security Context */
+        uno::Reference< css::xml::crypto::XXMLSecurityContext > xSecCtx = css::xml::crypto::XMLSecurityContext::create( m_xContext );
+
+        uno::Reference< css::xml::crypto::XSecurityEnvironment > xSecEnv = css::xml::crypto::SecurityEnvironment::create( m_xContext );
+        uno::Reference< lang::XUnoTunnel > xSecEnvTunnel(xSecEnv, uno::UNO_QUERY_THROW);
+        SecurityEnvironment_NssImpl* pSecEnv = reinterpret_cast<SecurityEnvironment_NssImpl*>(
+            sal::static_int_cast<sal_uIntPtr>(
+                xSecEnvTunnel->getSomething(SecurityEnvironment_NssImpl::getUnoTunnelId() ))) ;
+        pSecEnv->setCertDb(pCertHandle);
+
+        sal_Int32 n = xSecCtx->addSecurityEnvironment(xSecEnv);
+        //originally the SecurityEnvironment with the internal slot was set as default
+        xSecCtx->setDefaultSecurityEnvironmentIndex( n );
+        return xSecCtx;
+    }
+    catch( const uno::Exception& )
+    {
+        //PK11_LogoutAll();
+        //NSS_Shutdown();
+        return nullptr;
+    }
+}
+
+void SAL_CALL SEInitializer_NssImpl::freeSecurityContext( const uno::Reference< css::xml::crypto::XXMLSecurityContext >& )
+{
+    /*
+     * because the security context will free all its content when it
+     * is destructed, so here no free process for the security context
+     * is needed.
+     */
+    //PK11_LogoutAll();
+    //NSS_Shutdown();
+}
+
+/* XServiceInfo */
+OUString SAL_CALL SEInitializer_NssImpl::getImplementationName(  )
+{
+    return "com.sun.star.xml.crypto.SEInitializer";
+}
+sal_Bool SAL_CALL SEInitializer_NssImpl::supportsService( const OUString& rServiceName )
+{
+    return cppu::supportsService( this, rServiceName );
+}
+uno::Sequence< OUString > SAL_CALL SEInitializer_NssImpl::getSupportedServiceNames(  )
+{
+    return { "com.sun.star.xml.crypto.SEInitializer" };
+}
+
+namespace {
+
+class NSSInitializer_NssImpl : public SEInitializer_NssImpl
+{
+public:
+    explicit NSSInitializer_NssImpl(const uno::Reference<uno::XComponentContext>& xContext);
+    OUString SAL_CALL getImplementationName() override;
+    uno::Sequence<OUString> SAL_CALL getSupportedServiceNames() override;
+};
+
+}
+
+NSSInitializer_NssImpl::NSSInitializer_NssImpl(const uno::Reference<uno::XComponentContext>& xContext)
+    : SEInitializer_NssImpl(xContext)
+{
+}
+
+OUString NSSInitializer_NssImpl::getImplementationName()
+{
+    return "com.sun.star.xml.crypto.NSSInitializer";
+}
+
+uno::Sequence<OUString> SAL_CALL NSSInitializer_NssImpl::getSupportedServiceNames()
+{
+    return { "com.sun.star.xml.crypto.NSSInitializer" };
+}
+
+extern "C" SAL_DLLPUBLIC_EXPORT uno::XInterface*
+com_sun_star_xml_crypto_NSSInitializer_get_implementation(
+    uno::XComponentContext* pCtx, uno::Sequence<uno::Any> const& /*rSeq*/)
+{
+    return cppu::acquire(new NSSInitializer_NssImpl(pCtx));
+}
+
+extern "C" SAL_DLLPUBLIC_EXPORT uno::XInterface*
+com_sun_star_xml_crypto_SEInitializer_get_implementation(
+    uno::XComponentContext* pCtx, uno::Sequence<uno::Any> const& /*rSeq*/)
+{
+    return cppu::acquire(new SEInitializer_NssImpl(pCtx));
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/xmlsec/nss/seinitializer_nssimpl.hxx b/xmlsecurity/source/xmlsec/nss/seinitializer_nssimpl.hxx
new file mode 100644
index 000000000..ec6742529
--- /dev/null
+++ b/xmlsecurity/source/xmlsec/nss/seinitializer_nssimpl.hxx
@@ -0,0 +1,58 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#ifndef INCLUDED_XMLSECURITY_SOURCE_XMLSEC_NSS_SEINITIALIZER_NSSIMPL_HXX
+#define INCLUDED_XMLSECURITY_SOURCE_XMLSEC_NSS_SEINITIALIZER_NSSIMPL_HXX
+
+#include <com/sun/star/xml/crypto/XSEInitializer.hpp>
+
+#include <cppuhelper/implbase.hxx>
+
+#include "nssinitializer.hxx"
+
+namespace com::sun::star::xml::crypto { class XXMLSecurityContext; }
+
+class SEInitializer_NssImpl : public cppu::ImplInheritanceHelper
+<
+    ONSSInitializer,
+    css::xml::crypto::XSEInitializer
+>
+{
+public:
+    explicit SEInitializer_NssImpl(const css::uno::Reference<css::uno::XComponentContext > &rxContext);
+    virtual ~SEInitializer_NssImpl() override;
+
+    /* XSEInitializer */
+    virtual css::uno::Reference< css::xml::crypto::XXMLSecurityContext >
+        SAL_CALL createSecurityContext( const OUString& ) override;
+
+    virtual void SAL_CALL freeSecurityContext( const css::uno::Reference<
+        css::xml::crypto::XXMLSecurityContext >& securityContext ) override;
+
+    /* XServiceInfo */
+    virtual OUString SAL_CALL getImplementationName(  ) override;
+
+    virtual sal_Bool SAL_CALL supportsService( const OUString& ServiceName ) override;
+
+    virtual css::uno::Sequence< OUString > SAL_CALL getSupportedServiceNames(  ) override;
+};
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/xmlsec/nss/x509certificate_nssimpl.cxx b/xmlsecurity/source/xmlsec/nss/x509certificate_nssimpl.cxx
new file mode 100644
index 000000000..1a323d33f
--- /dev/null
+++ b/xmlsecurity/source/xmlsec/nss/x509certificate_nssimpl.cxx
@@ -0,0 +1,536 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include "nssrenam.h"
+#include <secder.h>
+
+#include <cert.h>
+#include <hasht.h>
+#include <secoid.h>
+#include <pk11pub.h>
+
+#include <sal/config.h>
+#include <comphelper/servicehelper.hxx>
+#include <cppuhelper/supportsservice.hxx>
+#include <rtl/ref.hxx>
+#include "x509certificate_nssimpl.hxx"
+
+#include <certificateextension_xmlsecimpl.hxx>
+
+#include "sanextension_nssimpl.hxx"
+#include <tools/time.hxx>
+#include <svl/sigstruct.hxx>
+
+using namespace ::com::sun::star;
+using namespace ::com::sun::star::uno ;
+using namespace ::com::sun::star::security ;
+
+using ::com::sun::star::security::XCertificate ;
+using ::com::sun::star::util::DateTime ;
+
+X509Certificate_NssImpl::X509Certificate_NssImpl() :
+    m_pCert(nullptr)
+{
+}
+
+X509Certificate_NssImpl::~X509Certificate_NssImpl() {
+    if( m_pCert != nullptr ) {
+        CERT_DestroyCertificate( m_pCert ) ;
+    }
+}
+
+//Methods from XCertificate
+sal_Int16 SAL_CALL X509Certificate_NssImpl::getVersion() {
+    if( m_pCert != nullptr ) {
+        if( m_pCert->version.len > 0 ) {
+            return static_cast<char>(*( m_pCert->version.data )) ;
+        } else
+            return 0 ;
+    } else {
+        return -1 ;
+    }
+}
+
+css::uno::Sequence< sal_Int8 > SAL_CALL X509Certificate_NssImpl::getSerialNumber() {
+    if( m_pCert != nullptr && m_pCert->serialNumber.len > 0 ) {
+        Sequence< sal_Int8 > serial( m_pCert->serialNumber.len ) ;
+        for( unsigned int i = 0 ; i < m_pCert->serialNumber.len ; i ++ )
+            serial[i] = *( m_pCert->serialNumber.data + i ) ;
+
+        return serial ;
+    } else {
+        return css::uno::Sequence< sal_Int8 >();
+    }
+}
+
+OUString SAL_CALL X509Certificate_NssImpl::getIssuerName() {
+    if( m_pCert != nullptr ) {
+        return OUString(m_pCert->issuerName , PL_strlen(m_pCert->issuerName) , RTL_TEXTENCODING_UTF8) ;
+    } else {
+        return OUString() ;
+    }
+}
+
+OUString SAL_CALL X509Certificate_NssImpl::getSubjectName() {
+    if( m_pCert != nullptr ) {
+        return OUString(m_pCert->subjectName , PL_strlen(m_pCert->subjectName) , RTL_TEXTENCODING_UTF8);
+    } else {
+        return OUString() ;
+    }
+}
+
+css::util::DateTime SAL_CALL X509Certificate_NssImpl::getNotValidBefore() {
+    if( m_pCert != nullptr ) {
+        SECStatus rv ;
+        PRTime notBefore ;
+        PRExplodedTime explTime ;
+        DateTime dateTime ;
+
+        rv = DER_DecodeTimeChoice( &notBefore, &m_pCert->validity.notBefore ) ;
+        if( rv ) {
+            return DateTime() ;
+        }
+
+        //Convert the time to readable local time
+        PR_ExplodeTime( notBefore, PR_LocalTimeParameters, &explTime ) ;
+
+        dateTime.NanoSeconds = static_cast< sal_Int32 >( explTime.tm_usec * ::tools::Time::nanoPerMicro  );
+        dateTime.Seconds = static_cast< sal_Int16 >( explTime.tm_sec  );
+        dateTime.Minutes = static_cast< sal_Int16 >( explTime.tm_min  );
+        dateTime.Hours = static_cast< sal_Int16 >( explTime.tm_hour  );
+        dateTime.Day = static_cast< sal_Int16 >( explTime.tm_mday  );
+        dateTime.Month = static_cast< sal_Int16 >( explTime.tm_month+1  );
+        dateTime.Year = static_cast< sal_Int16 >( explTime.tm_year  );
+
+        return dateTime ;
+    } else {
+        return DateTime() ;
+    }
+}
+
+css::util::DateTime SAL_CALL X509Certificate_NssImpl::getNotValidAfter() {
+    if( m_pCert != nullptr ) {
+        SECStatus rv ;
+        PRTime notAfter ;
+        PRExplodedTime explTime ;
+        DateTime dateTime ;
+
+        rv = DER_DecodeTimeChoice( &notAfter, &m_pCert->validity.notAfter ) ;
+        if( rv ) {
+            return DateTime() ;
+        }
+
+        //Convert the time to readable local time
+        PR_ExplodeTime( notAfter, PR_LocalTimeParameters, &explTime ) ;
+
+        dateTime.NanoSeconds = static_cast< sal_Int16 >( explTime.tm_usec * ::tools::Time::nanoPerMicro );
+        dateTime.Seconds = static_cast< sal_Int16 >( explTime.tm_sec  );
+        dateTime.Minutes = static_cast< sal_Int16 >( explTime.tm_min  );
+        dateTime.Hours = static_cast< sal_Int16 >( explTime.tm_hour  );
+        dateTime.Day = static_cast< sal_Int16 >( explTime.tm_mday  );
+        dateTime.Month = static_cast< sal_Int16 >( explTime.tm_month+1  );
+        dateTime.Year = static_cast< sal_Int16 >( explTime.tm_year  );
+
+        return dateTime ;
+    } else {
+        return DateTime() ;
+    }
+}
+
+css::uno::Sequence< sal_Int8 > SAL_CALL X509Certificate_NssImpl::getIssuerUniqueID() {
+    if( m_pCert != nullptr && m_pCert->issuerID.len > 0 ) {
+        Sequence< sal_Int8 > issuerUid( m_pCert->issuerID.len ) ;
+        for( unsigned int i = 0 ; i < m_pCert->issuerID.len ; i ++ )
+            issuerUid[i] = *( m_pCert->issuerID.data + i ) ;
+
+        return issuerUid ;
+    } else {
+        return css::uno::Sequence< sal_Int8 >();
+    }
+}
+
+css::uno::Sequence< sal_Int8 > SAL_CALL X509Certificate_NssImpl::getSubjectUniqueID() {
+    if( m_pCert != nullptr && m_pCert->subjectID.len > 0 ) {
+        Sequence< sal_Int8 > subjectUid( m_pCert->subjectID.len ) ;
+        for( unsigned int i = 0 ; i < m_pCert->subjectID.len ; i ++ )
+            subjectUid[i] = *( m_pCert->subjectID.data + i ) ;
+
+        return subjectUid ;
+    } else {
+        return css::uno::Sequence< sal_Int8 >();
+    }
+}
+
+css::uno::Sequence< css::uno::Reference< css::security::XCertificateExtension > > SAL_CALL X509Certificate_NssImpl::getExtensions() {
+    if( m_pCert != nullptr && m_pCert->extensions != nullptr ) {
+        CERTCertExtension** extns ;
+        int len ;
+
+        for( len = 0, extns = m_pCert->extensions; *extns != nullptr; len ++, extns ++ ) ;
+        Sequence< Reference< XCertificateExtension > > xExtns( len ) ;
+
+        for( extns = m_pCert->extensions, len = 0; *extns != nullptr; extns ++, len ++ ) {
+            const SECItem id = (*extns)->id;
+            OString oidString(CERT_GetOidString(&id));
+
+            bool crit;
+            if( (*extns)->critical.data == nullptr )
+                crit = false ;
+            else
+                crit = (*extns)->critical.data[0] == 0xFF;
+
+            // remove "OID." prefix if existing
+            OString objID;
+            OString oid("OID.");
+            if (oidString.match(oid))
+                objID = oidString.copy(oid.getLength());
+            else
+                objID = oidString;
+
+            unsigned char* value = (*extns)->value.data;
+            unsigned int vlen = (*extns)->value.len;
+            unsigned char* objid = reinterpret_cast<unsigned char *>(const_cast<char *>(objID.getStr()));
+            unsigned int objidlen = objID.getLength();
+
+            if (objID == "2.5.29.17")
+            {
+                SanExtensionImpl* pExtn = new SanExtensionImpl;
+                pExtn->setCertExtn(value, vlen, objid, objidlen, crit);
+                xExtns[len] = pExtn ;
+            }
+            else
+            {
+                CertificateExtension_XmlSecImpl* pExtn = new CertificateExtension_XmlSecImpl;
+                pExtn->setCertExtn(value, vlen, objid, objidlen, crit);
+                xExtns[len] = pExtn;
+            }
+        }
+
+        return xExtns ;
+    } else {
+        return css::uno::Sequence< css::uno::Reference< css::security::XCertificateExtension > > ();
+    }
+}
+
+css::uno::Reference< css::security::XCertificateExtension > SAL_CALL X509Certificate_NssImpl::findCertificateExtension( const css::uno::Sequence< sal_Int8 >& oid ) {
+    if( m_pCert != nullptr && m_pCert->extensions != nullptr ) {
+        CERTCertExtension** extns ;
+        SECItem idItem ;
+
+        idItem.data = reinterpret_cast<unsigned char *>(const_cast<sal_Int8 *>(oid.getConstArray()));
+        idItem.len = oid.getLength() ;
+
+        css::uno::Reference<css::security::XCertificateExtension> xExtn;
+        for( extns = m_pCert->extensions; *extns != nullptr; extns ++ ) {
+            if( SECITEM_CompareItem( &idItem, &(*extns)->id ) == SECEqual ) {
+                const SECItem id = (*extns)->id;
+                OString objId(CERT_GetOidString(&id));
+
+                bool crit;
+                if( (*extns)->critical.data == nullptr )
+                    crit = false ;
+                else
+                    crit = (*extns)->critical.data[0] == 0xFF;
+
+                unsigned char* value = (*extns)->value.data;
+                unsigned int vlen = (*extns)->value.len;
+                unsigned char* objid = (*extns)->id.data;
+                unsigned int objidlen = (*extns)->id.len;
+
+                if ( objId == "OID.2.5.29.17" )
+                {
+                    rtl::Reference<SanExtensionImpl> xSanImpl(
+                        new SanExtensionImpl);
+                    xSanImpl->setCertExtn(value, vlen, objid, objidlen, crit);
+                    xExtn = xSanImpl.get();
+                }
+                else
+                {
+                    rtl::Reference<CertificateExtension_XmlSecImpl> xSecImpl(
+                        new CertificateExtension_XmlSecImpl);
+                    xSecImpl->setCertExtn(value, vlen, objid, objidlen, crit);
+                    xExtn = xSecImpl.get();
+                }
+                break;
+            }
+        }
+
+        return xExtn;
+    } else {
+        return nullptr ;
+    }
+}
+
+
+css::uno::Sequence< sal_Int8 > SAL_CALL X509Certificate_NssImpl::getEncoded() {
+    if( m_pCert != nullptr && m_pCert->derCert.len > 0 ) {
+        Sequence< sal_Int8 > rawCert( m_pCert->derCert.len ) ;
+
+        for( unsigned int i = 0 ; i < m_pCert->derCert.len ; i ++ )
+            rawCert[i] = *( m_pCert->derCert.data + i ) ;
+
+        return rawCert ;
+    } else {
+        return css::uno::Sequence< sal_Int8 >();
+    }
+}
+
+//Helper methods
+void X509Certificate_NssImpl::setCert( CERTCertificate* cert ) {
+    if( m_pCert != nullptr ) {
+        CERT_DestroyCertificate( m_pCert ) ;
+        m_pCert = nullptr ;
+    }
+
+    if( cert != nullptr ) {
+        m_pCert = CERT_DupCertificate( cert ) ;
+    }
+}
+
+const CERTCertificate* X509Certificate_NssImpl::getNssCert() const {
+    if( m_pCert != nullptr ) {
+        return m_pCert ;
+    } else {
+        return nullptr ;
+    }
+}
+
+void X509Certificate_NssImpl::setRawCert( const Sequence< sal_Int8 >& rawCert ) {
+    CERTCertificate* cert ;
+    SECItem certItem ;
+
+    certItem.data = reinterpret_cast<unsigned char *>(const_cast<sal_Int8 *>(rawCert.getConstArray()));
+    certItem.len = rawCert.getLength() ;
+
+    cert = CERT_DecodeDERCertificate( &certItem, PR_TRUE, nullptr ) ;
+    if( cert == nullptr )
+        throw RuntimeException() ;
+
+    if( m_pCert != nullptr ) {
+        CERT_DestroyCertificate( m_pCert ) ;
+        m_pCert = nullptr ;
+    }
+
+    m_pCert = cert ;
+}
+
+SECKEYPrivateKey* X509Certificate_NssImpl::getPrivateKey()
+{
+    if (m_pCert && m_pCert->slot)
+    {
+        SECKEYPrivateKey* pPrivateKey = PK11_FindPrivateKeyFromCert(m_pCert->slot, m_pCert, nullptr);
+        if (pPrivateKey)
+            return pPrivateKey;
+    }
+    return nullptr;
+}
+
+/* XUnoTunnel */
+sal_Int64 SAL_CALL X509Certificate_NssImpl::getSomething( const Sequence< sal_Int8 >& aIdentifier ) {
+    if( isUnoTunnelId<X509Certificate_NssImpl>(aIdentifier) ) {
+        return sal::static_int_cast<sal_Int64>(reinterpret_cast<sal_uIntPtr>(this));
+    }
+    return 0 ;
+}
+
+/* XUnoTunnel extension */
+
+namespace
+{
+    class theX509Certificate_NssImplUnoTunnelId : public rtl::Static< UnoTunnelIdInit, theX509Certificate_NssImplUnoTunnelId > {};
+}
+
+const Sequence< sal_Int8>& X509Certificate_NssImpl::getUnoTunnelId() {
+    return theX509Certificate_NssImplUnoTunnelId::get().getSeq();
+}
+
+static OUString getAlgorithmDescription(SECAlgorithmID const *aid)
+{
+    SECOidTag tag;
+    tag = SECOID_GetAlgorithmTag(aid);
+
+    const char *pDesc = SECOID_FindOIDTagDescription(tag);
+
+    return OUString::createFromAscii( pDesc ) ;
+}
+
+static css::uno::Sequence< sal_Int8 > getThumbprint(CERTCertificate const *pCert, SECOidTag id)
+{
+    if( pCert != nullptr )
+    {
+        SECStatus rv;
+        unsigned char fingerprint[32];
+        int length = 0;
+        switch (id)
+        {
+        case SEC_OID_MD5:
+            length = MD5_LENGTH;
+            break;
+        case SEC_OID_SHA1:
+            length = SHA1_LENGTH;
+            break;
+        case SEC_OID_SHA256:
+            length = SHA256_LENGTH;
+            break;
+        default:
+            break;
+        }
+
+        memset(fingerprint, 0, sizeof fingerprint);
+        rv = PK11_HashBuf(id, fingerprint, pCert->derCert.data, pCert->derCert.len);
+        if(rv == SECSuccess)
+        {
+            Sequence< sal_Int8 > thumbprint( length ) ;
+            for( int i = 0 ; i < length ; i ++ )
+                thumbprint[i] = fingerprint[i];
+
+            return thumbprint;
+        }
+    }
+    return css::uno::Sequence< sal_Int8 >();
+}
+
+OUString SAL_CALL X509Certificate_NssImpl::getSubjectPublicKeyAlgorithm()
+{
+    if( m_pCert != nullptr )
+    {
+        return getAlgorithmDescription(&(m_pCert->subjectPublicKeyInfo.algorithm));
+    }
+    else
+    {
+        return OUString() ;
+    }
+}
+
+css::uno::Sequence< sal_Int8 > SAL_CALL X509Certificate_NssImpl::getSubjectPublicKeyValue()
+{
+    if( m_pCert != nullptr )
+    {
+        SECItem spk = m_pCert->subjectPublicKeyInfo.subjectPublicKey;
+        DER_ConvertBitString(&spk);
+
+        if ( spk.len>0)
+        {
+            Sequence< sal_Int8 > key( spk.len ) ;
+            for( unsigned int i = 0 ; i < spk.len ; i ++ )
+            {
+                key[i] = *( spk.data + i ) ;
+            }
+
+            return key ;
+        }
+    }
+
+    return css::uno::Sequence< sal_Int8 >();
+}
+
+OUString SAL_CALL X509Certificate_NssImpl::getSignatureAlgorithm()
+{
+    if( m_pCert != nullptr )
+    {
+        return getAlgorithmDescription(&(m_pCert->signature));
+    }
+    else
+    {
+        return OUString() ;
+    }
+}
+
+svl::crypto::SignatureMethodAlgorithm X509Certificate_NssImpl::getSignatureMethodAlgorithm()
+{
+    svl::crypto::SignatureMethodAlgorithm nRet = svl::crypto::SignatureMethodAlgorithm::RSA;
+
+    if (!m_pCert)
+        return nRet;
+
+    SECOidTag eTag = SECOID_GetAlgorithmTag(&m_pCert->subjectPublicKeyInfo.algorithm);
+    if (eTag == SEC_OID_ANSIX962_EC_PUBLIC_KEY)
+        nRet = svl::crypto::SignatureMethodAlgorithm::ECDSA;
+
+    return nRet;
+}
+
+css::uno::Sequence< sal_Int8 > SAL_CALL X509Certificate_NssImpl::getSHA1Thumbprint()
+{
+    return getThumbprint(m_pCert, SEC_OID_SHA1);
+}
+
+uno::Sequence<sal_Int8> X509Certificate_NssImpl::getSHA256Thumbprint()
+{
+    return getThumbprint(m_pCert, SEC_OID_SHA256);
+}
+
+css::uno::Sequence< sal_Int8 > SAL_CALL X509Certificate_NssImpl::getMD5Thumbprint()
+{
+    return getThumbprint(m_pCert, SEC_OID_MD5);
+}
+
+CertificateKind SAL_CALL X509Certificate_NssImpl::getCertificateKind()
+{
+    return CertificateKind_X509;
+}
+
+sal_Int32 SAL_CALL X509Certificate_NssImpl::getCertificateUsage(  )
+{
+    SECStatus rv;
+    SECItem tmpitem;
+    sal_Int32 usage;
+
+    rv = CERT_FindKeyUsageExtension(m_pCert, &tmpitem);
+    if ( rv == SECSuccess )
+    {
+        usage = tmpitem.data[0];
+        PORT_Free(tmpitem.data);
+        tmpitem.data = nullptr;
+    }
+    else
+    {
+        usage = KU_ALL;
+    }
+
+    /*
+     * to make the nss implementation compatible with MSCrypto,
+     * the following usage is ignored
+     *
+     *
+    if ( CERT_GovtApprovedBitSet(m_pCert) )
+    {
+        usage |= KU_NS_GOVT_APPROVED;
+    }
+    */
+
+    return usage;
+}
+
+/* XServiceInfo */
+OUString SAL_CALL X509Certificate_NssImpl::getImplementationName()
+{
+    return "com.sun.star.xml.security.gpg.XCertificate_NssImpl";
+}
+
+/* XServiceInfo */
+sal_Bool SAL_CALL X509Certificate_NssImpl::supportsService(const OUString& serviceName)
+{
+    return cppu::supportsService(this, serviceName);
+}
+
+/* XServiceInfo */
+Sequence<OUString> SAL_CALL X509Certificate_NssImpl::getSupportedServiceNames() { return { OUString() }; }
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/xmlsec/nss/x509certificate_nssimpl.hxx b/xmlsecurity/source/xmlsec/nss/x509certificate_nssimpl.hxx
new file mode 100644
index 000000000..35cd393f2
--- /dev/null
+++ b/xmlsecurity/source/xmlsec/nss/x509certificate_nssimpl.hxx
@@ -0,0 +1,107 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#ifndef INCLUDED_XMLSECURITY_SOURCE_XMLSEC_NSS_X509CERTIFICATE_NSSIMPL_HXX
+#define INCLUDED_XMLSECURITY_SOURCE_XMLSEC_NSS_X509CERTIFICATE_NSSIMPL_HXX
+
+#include <sal/config.h>
+#include <rtl/ustring.hxx>
+#include <cppuhelper/implbase.hxx>
+#include <com/sun/star/lang/XUnoTunnel.hpp>
+#include <com/sun/star/lang/XServiceInfo.hpp>
+#include <com/sun/star/security/CertificateKind.hpp>
+#include <com/sun/star/security/XCertificate.hpp>
+
+#include <certificate.hxx>
+#include <certt.h>
+#include <keythi.h>
+
+class X509Certificate_NssImpl : public ::cppu::WeakImplHelper<
+    css::security::XCertificate ,
+    css::lang::XUnoTunnel,
+    css::lang::XServiceInfo > , public xmlsecurity::Certificate
+{
+    private:
+        CERTCertificate* m_pCert;
+
+    public:
+        X509Certificate_NssImpl() ;
+        virtual ~X509Certificate_NssImpl() override ;
+
+        //Methods from XCertificate
+        virtual sal_Int16 SAL_CALL getVersion(  ) override ;
+
+        virtual css::uno::Sequence< sal_Int8 > SAL_CALL getSerialNumber(  ) override ;
+
+        virtual OUString SAL_CALL getIssuerName(  ) override ;
+        virtual OUString SAL_CALL getSubjectName(  ) override ;
+
+        virtual css::util::DateTime SAL_CALL getNotValidBefore(  ) override ;
+        virtual css::util::DateTime SAL_CALL getNotValidAfter(  ) override ;
+
+        virtual css::uno::Sequence< sal_Int8 > SAL_CALL getIssuerUniqueID(  ) override ;
+        virtual css::uno::Sequence< sal_Int8 > SAL_CALL getSubjectUniqueID(  ) override ;
+
+        virtual css::uno::Sequence< css::uno::Reference< css::security::XCertificateExtension > > SAL_CALL getExtensions(  ) override ;
+
+        virtual css::uno::Reference< css::security::XCertificateExtension > SAL_CALL findCertificateExtension( const css::uno::Sequence< sal_Int8 >& oid ) override ;
+
+        virtual css::uno::Sequence< sal_Int8 > SAL_CALL getEncoded(  ) override ;
+
+        virtual OUString SAL_CALL getSubjectPublicKeyAlgorithm() override ;
+
+        virtual css::uno::Sequence< sal_Int8 > SAL_CALL getSubjectPublicKeyValue() override ;
+
+        virtual OUString SAL_CALL getSignatureAlgorithm() override ;
+
+        virtual css::uno::Sequence< sal_Int8 > SAL_CALL getSHA1Thumbprint() override ;
+
+        virtual css::uno::Sequence< sal_Int8 > SAL_CALL getMD5Thumbprint() override ;
+        virtual css::security::CertificateKind SAL_CALL getCertificateKind() override;
+
+        virtual sal_Int32 SAL_CALL getCertificateUsage( ) override ;
+
+        //Methods from XUnoTunnel
+        virtual sal_Int64 SAL_CALL getSomething( const css::uno::Sequence< sal_Int8 >& aIdentifier ) override;
+
+        /// @see xmlsecurity::Certificate::getSHA256Thumbprint().
+        virtual css::uno::Sequence<sal_Int8> getSHA256Thumbprint() override;
+
+        /// @see xmlsecurity::Certificate::getSignatureMethodAlgorithm().
+        virtual svl::crypto::SignatureMethodAlgorithm getSignatureMethodAlgorithm() override;
+
+        static const css::uno::Sequence< sal_Int8 >& getUnoTunnelId() ;
+
+        //Helper methods
+        void setCert( CERTCertificate* cert ) ;
+        const CERTCertificate* getNssCert() const ;
+
+        /// @throws css::uno::RuntimeException
+        void setRawCert( const css::uno::Sequence< sal_Int8 >& rawCert ) ;
+        SECKEYPrivateKey* getPrivateKey();
+
+        // XServiceInfo
+        virtual OUString SAL_CALL getImplementationName() override;
+        virtual sal_Bool SAL_CALL supportsService(const OUString& ServiceName) override;
+        virtual css::uno::Sequence<OUString> SAL_CALL getSupportedServiceNames() override;
+} ;
+
+#endif // INCLUDED_XMLSECURITY_SOURCE_XMLSEC_NSS_X509CERTIFICATE_NSSIMPL_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/xmlsec/nss/xmlsecuritycontext_nssimpl.cxx b/xmlsecurity/source/xmlsec/nss/xmlsecuritycontext_nssimpl.cxx
new file mode 100644
index 000000000..2566a40ac
--- /dev/null
+++ b/xmlsecurity/source/xmlsec/nss/xmlsecuritycontext_nssimpl.cxx
@@ -0,0 +1,150 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <sal/config.h>
+#include <vector>
+#include <cppuhelper/implbase.hxx>
+#include <cppuhelper/supportsservice.hxx>
+#include <com/sun/star/lang/XServiceInfo.hpp>
+#include <com/sun/star/xml/crypto/XXMLSecurityContext.hpp>
+
+namespace com::sun::star::uno { class XComponentContext; }
+
+using namespace ::com::sun::star;
+using namespace ::com::sun::star::lang ;
+
+using ::com::sun::star::xml::crypto::XSecurityEnvironment ;
+using ::com::sun::star::xml::crypto::XXMLSecurityContext ;
+
+namespace {
+
+class XMLSecurityContext_NssImpl
+    : public ::cppu::WeakImplHelper<xml::crypto::XXMLSecurityContext, lang::XServiceInfo>
+{
+private:
+    std::vector<uno::Reference<xml::crypto::XSecurityEnvironment>> m_vSecurityEnvironments;
+
+    sal_Int32 m_nDefaultEnvIndex;
+
+public:
+    XMLSecurityContext_NssImpl();
+
+    //XXMLSecurityContext
+    virtual sal_Int32 SAL_CALL addSecurityEnvironment(
+        const uno::Reference<xml::crypto::XSecurityEnvironment>& aSecurityEnvironment) override;
+
+    virtual ::sal_Int32 SAL_CALL getSecurityEnvironmentNumber() override;
+
+    virtual uno::Reference<xml::crypto::XSecurityEnvironment>
+        SAL_CALL getSecurityEnvironmentByIndex(::sal_Int32 index) override;
+
+    virtual uno::Reference<xml::crypto::XSecurityEnvironment>
+        SAL_CALL getSecurityEnvironment() override;
+
+    virtual ::sal_Int32 SAL_CALL getDefaultSecurityEnvironmentIndex() override;
+
+    virtual void SAL_CALL setDefaultSecurityEnvironmentIndex(sal_Int32 nDefaultEnvIndex) override;
+
+    //XServiceInfo
+    virtual OUString SAL_CALL getImplementationName() override;
+
+    virtual sal_Bool SAL_CALL supportsService(const OUString& ServiceName) override;
+
+    virtual uno::Sequence<OUString> SAL_CALL getSupportedServiceNames() override;
+};
+
+}
+
+XMLSecurityContext_NssImpl::XMLSecurityContext_NssImpl()
+    : m_nDefaultEnvIndex(-1)
+{
+}
+
+sal_Int32 SAL_CALL XMLSecurityContext_NssImpl::addSecurityEnvironment(
+    const uno::Reference< xml::crypto::XSecurityEnvironment >& aSecurityEnvironment)
+{
+    if( !aSecurityEnvironment.is() )
+    {
+        throw uno::RuntimeException() ;
+    }
+
+    m_vSecurityEnvironments.push_back( aSecurityEnvironment );
+
+    return m_vSecurityEnvironments.size() - 1 ;
+}
+
+
+sal_Int32 SAL_CALL XMLSecurityContext_NssImpl::getSecurityEnvironmentNumber(  )
+{
+    return m_vSecurityEnvironments.size();
+}
+
+uno::Reference< xml::crypto::XSecurityEnvironment > SAL_CALL
+    XMLSecurityContext_NssImpl::getSecurityEnvironmentByIndex( sal_Int32 index )
+{
+    if (index < 0 || index >= static_cast<sal_Int32>(m_vSecurityEnvironments.size()))
+        throw uno::RuntimeException();
+
+    uno::Reference< xml::crypto::XSecurityEnvironment > xSecurityEnvironment = m_vSecurityEnvironments[index];
+    return xSecurityEnvironment;
+}
+
+uno::Reference< xml::crypto::XSecurityEnvironment > SAL_CALL
+    XMLSecurityContext_NssImpl::getSecurityEnvironment(  )
+{
+    if (m_nDefaultEnvIndex < 0 || m_nDefaultEnvIndex >= static_cast<sal_Int32>(m_vSecurityEnvironments.size()))
+        throw uno::RuntimeException();
+
+    return getSecurityEnvironmentByIndex(m_nDefaultEnvIndex);
+}
+
+sal_Int32 SAL_CALL XMLSecurityContext_NssImpl::getDefaultSecurityEnvironmentIndex(  )
+{
+    return m_nDefaultEnvIndex ;
+}
+
+void SAL_CALL XMLSecurityContext_NssImpl::setDefaultSecurityEnvironmentIndex( sal_Int32 nDefaultEnvIndex )
+{
+    m_nDefaultEnvIndex = nDefaultEnvIndex;
+}
+
+/* XServiceInfo */
+OUString SAL_CALL XMLSecurityContext_NssImpl::getImplementationName() {
+    return "com.sun.star.xml.crypto.XMLSecurityContext";
+}
+
+/* XServiceInfo */
+sal_Bool SAL_CALL XMLSecurityContext_NssImpl::supportsService( const OUString& serviceName) {
+    return cppu::supportsService(this, serviceName);
+}
+
+/* XServiceInfo */
+uno::Sequence< OUString > SAL_CALL XMLSecurityContext_NssImpl::getSupportedServiceNames() {
+    uno::Sequence<OUString> seqServiceNames { "com.sun.star.xml.crypto.XMLSecurityContext" };
+    return seqServiceNames ;
+}
+
+extern "C" SAL_DLLPUBLIC_EXPORT uno::XInterface*
+com_sun_star_xml_crypto_XMLSecurityContext_get_implementation(
+    uno::XComponentContext* /*pCtx*/, uno::Sequence<uno::Any> const& /*rSeq*/)
+{
+    return cppu::acquire(new XMLSecurityContext_NssImpl);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/xmlsec/nss/xmlsignature_nssimpl.cxx b/xmlsecurity/source/xmlsec/nss/xmlsignature_nssimpl.cxx
new file mode 100644
index 000000000..32e4335a5
--- /dev/null
+++ b/xmlsecurity/source/xmlsec/nss/xmlsignature_nssimpl.cxx
@@ -0,0 +1,317 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <sal/config.h>
+#include <xmlsec-wrapper.h>
+
+#include <xmlelementwrapper_xmlsecimpl.hxx>
+#include <xmlsec/xmlstreamio.hxx>
+#include <xmlsec/errorcallback.hxx>
+
+#include "securityenvironment_nssimpl.hxx"
+
+#include <com/sun/star/xml/crypto/XXMLSignature.hpp>
+#include <memory>
+
+namespace com::sun::star::uno { class XComponentContext; }
+
+using namespace ::com::sun::star;
+using namespace ::com::sun::star::uno ;
+using namespace ::com::sun::star::lang ;
+
+using ::com::sun::star::xml::wrapper::XXMLElementWrapper ;
+using ::com::sun::star::xml::crypto::XSecurityEnvironment ;
+using ::com::sun::star::xml::crypto::XXMLSignature ;
+using ::com::sun::star::xml::crypto::XXMLSignatureTemplate ;
+using ::com::sun::star::xml::crypto::XXMLSecurityContext ;
+using ::com::sun::star::xml::crypto::XUriBinding ;
+
+namespace std
+{
+template <> struct default_delete<xmlSecKeysMngr>
+{
+    void operator()(xmlSecKeysMngrPtr ptr) { SecurityEnvironment_NssImpl::destroyKeysManager(ptr); }
+};
+template <> struct default_delete<xmlSecDSigCtx>
+{
+    void operator()(xmlSecDSigCtxPtr ptr) { xmlSecDSigCtxDestroy(ptr); }
+};
+}
+
+namespace {
+
+class XMLSignature_NssImpl
+    : public ::cppu::WeakImplHelper<xml::crypto::XXMLSignature, lang::XServiceInfo>
+{
+public:
+    explicit XMLSignature_NssImpl();
+
+    //Methods from XXMLSignature
+    virtual uno::Reference<xml::crypto::XXMLSignatureTemplate> SAL_CALL
+    generate(const uno::Reference<xml::crypto::XXMLSignatureTemplate>& aTemplate,
+             const uno::Reference<xml::crypto::XSecurityEnvironment>& aEnvironment) override;
+
+    virtual uno::Reference<xml::crypto::XXMLSignatureTemplate> SAL_CALL
+    validate(const uno::Reference<xml::crypto::XXMLSignatureTemplate>& aTemplate,
+             const uno::Reference<xml::crypto::XXMLSecurityContext>& aContext) override;
+
+    //Methods from XServiceInfo
+    virtual OUString SAL_CALL getImplementationName() override;
+
+    virtual sal_Bool SAL_CALL supportsService(const OUString& ServiceName) override;
+
+    virtual uno::Sequence<OUString> SAL_CALL getSupportedServiceNames() override;
+};
+
+}
+
+XMLSignature_NssImpl::XMLSignature_NssImpl() {
+}
+
+/* XXMLSignature */
+Reference< XXMLSignatureTemplate >
+SAL_CALL XMLSignature_NssImpl::generate(
+    const Reference< XXMLSignatureTemplate >& aTemplate ,
+    const Reference< XSecurityEnvironment >& aEnvironment
+)
+{
+    xmlNodePtr pNode = nullptr ;
+
+    if( !aTemplate.is() )
+        throw RuntimeException() ;
+
+    if( !aEnvironment.is() )
+        throw RuntimeException() ;
+
+    //Get the xml node
+    Reference< XXMLElementWrapper > xElement = aTemplate->getTemplate() ;
+    if( !xElement.is() ) {
+        throw RuntimeException() ;
+    }
+
+    Reference< XUnoTunnel > xNodTunnel( xElement , UNO_QUERY_THROW ) ;
+    XMLElementWrapper_XmlSecImpl* pElement =
+        reinterpret_cast<XMLElementWrapper_XmlSecImpl*>(
+            sal::static_int_cast<sal_uIntPtr>(
+                xNodTunnel->getSomething( XMLElementWrapper_XmlSecImpl::getUnoTunnelId() )));
+    if( pElement == nullptr ) {
+        throw RuntimeException() ;
+    }
+
+    pNode = pElement->getNativeElement() ;
+
+    //Get the stream/URI binding
+    Reference< XUriBinding > xUriBinding = aTemplate->getBinding() ;
+    if( xUriBinding.is() ) {
+        //Register the stream input callbacks into libxml2
+        if( xmlRegisterStreamInputCallbacks( xUriBinding ) < 0 )
+            throw RuntimeException() ;
+    }
+
+    //Get Keys Manager
+    Reference< XUnoTunnel > xSecTunnel( aEnvironment , UNO_QUERY_THROW ) ;
+
+    // the key manager should be retrieved from SecurityEnvironment, instead of SecurityContext
+
+    SecurityEnvironment_NssImpl* pSecEnv =
+        reinterpret_cast<SecurityEnvironment_NssImpl*>(
+            sal::static_int_cast<sal_uIntPtr>(
+                xSecTunnel->getSomething( SecurityEnvironment_NssImpl::getUnoTunnelId() )));
+    if( pSecEnv == nullptr )
+        throw RuntimeException() ;
+
+    setErrorRecorder();
+
+    std::unique_ptr<xmlSecKeysMngr> pMngr(pSecEnv->createKeysManager());
+    if( !pMngr ) {
+        throw RuntimeException() ;
+    }
+
+    //Create Signature context
+    std::unique_ptr<xmlSecDSigCtx> pDsigCtx(xmlSecDSigCtxCreate(pMngr.get()));
+    if( pDsigCtx == nullptr )
+    {
+        //throw XMLSignatureException() ;
+        clearErrorRecorder();
+        return aTemplate;
+    }
+
+    //Sign the template
+    if( xmlSecDSigCtxSign( pDsigCtx.get() , pNode ) == 0 )
+    {
+        if (pDsigCtx->status == xmlSecDSigStatusSucceeded)
+            aTemplate->setStatus(css::xml::crypto::SecurityOperationStatus_OPERATION_SUCCEEDED);
+        else
+            aTemplate->setStatus(css::xml::crypto::SecurityOperationStatus_UNKNOWN);
+    }
+    else
+    {
+        aTemplate->setStatus(css::xml::crypto::SecurityOperationStatus_UNKNOWN);
+    }
+
+    //Unregistered the stream/URI binding
+    if( xUriBinding.is() )
+        xmlUnregisterStreamInputCallbacks() ;
+
+    clearErrorRecorder();
+    return aTemplate ;
+}
+
+/* XXMLSignature */
+Reference< XXMLSignatureTemplate >
+SAL_CALL XMLSignature_NssImpl::validate(
+    const Reference< XXMLSignatureTemplate >& aTemplate ,
+    const Reference< XXMLSecurityContext >& aSecurityCtx
+) {
+    xmlNodePtr pNode = nullptr ;
+    //sal_Bool valid ;
+
+    if( !aTemplate.is() )
+        throw RuntimeException() ;
+
+    if( !aSecurityCtx.is() )
+        throw RuntimeException() ;
+
+    //Get the xml node
+    Reference< XXMLElementWrapper > xElement = aTemplate->getTemplate() ;
+    if( !xElement.is() )
+        throw RuntimeException() ;
+
+    Reference< XUnoTunnel > xNodTunnel( xElement , UNO_QUERY_THROW ) ;
+    XMLElementWrapper_XmlSecImpl* pElement =
+        reinterpret_cast<XMLElementWrapper_XmlSecImpl*>(
+            sal::static_int_cast<sal_uIntPtr>(
+                xNodTunnel->getSomething( XMLElementWrapper_XmlSecImpl::getUnoTunnelId() )));
+    if( pElement == nullptr )
+        throw RuntimeException() ;
+
+    pNode = pElement->getNativeElement() ;
+
+    //Get the stream/URI binding
+    Reference< XUriBinding > xUriBinding = aTemplate->getBinding() ;
+    if( xUriBinding.is() ) {
+        //Register the stream input callbacks into libxml2
+        if( xmlRegisterStreamInputCallbacks( xUriBinding ) < 0 )
+            throw RuntimeException() ;
+    }
+
+    setErrorRecorder();
+
+    sal_Int32 nSecurityEnvironment = aSecurityCtx->getSecurityEnvironmentNumber();
+    sal_Int32 i;
+
+    for (i=0; i<nSecurityEnvironment; ++i)
+    {
+        Reference< XSecurityEnvironment > aEnvironment = aSecurityCtx->getSecurityEnvironmentByIndex(i);
+
+        //Get Keys Manager
+        Reference< XUnoTunnel > xSecTunnel( aEnvironment , UNO_QUERY_THROW ) ;
+        SecurityEnvironment_NssImpl* pSecEnv =
+            reinterpret_cast<SecurityEnvironment_NssImpl*>(
+                sal::static_int_cast<sal_uIntPtr>(
+                    xSecTunnel->getSomething( SecurityEnvironment_NssImpl::getUnoTunnelId() )));
+        if( pSecEnv == nullptr )
+            throw RuntimeException() ;
+
+        std::unique_ptr<xmlSecKeysMngr> pMngr(pSecEnv->createKeysManager());
+        if( !pMngr ) {
+            throw RuntimeException() ;
+        }
+
+        //Create Signature context
+        std::unique_ptr<xmlSecDSigCtx> pDsigCtx(xmlSecDSigCtxCreate(pMngr.get()));
+        if( pDsigCtx == nullptr )
+        {
+            clearErrorRecorder();
+            return aTemplate;
+        }
+
+        // We do certificate verification ourselves.
+        pDsigCtx->keyInfoReadCtx.flags |= XMLSEC_KEYINFO_FLAGS_X509DATA_DONT_VERIFY_CERTS;
+
+        //Verify signature
+        int rs = xmlSecDSigCtxVerify( pDsigCtx.get() , pNode );
+
+        // Also verify manifest: this is empty for ODF, but contains everything (except signature metadata) for OOXML.
+        xmlSecSize nReferenceCount = xmlSecPtrListGetSize(&pDsigCtx->manifestReferences);
+        // Require that all manifest references are also good.
+        xmlSecSize nReferenceGood = 0;
+        for (xmlSecSize nReference = 0; nReference < nReferenceCount; ++nReference)
+        {
+            xmlSecDSigReferenceCtxPtr pReference = static_cast<xmlSecDSigReferenceCtxPtr>(xmlSecPtrListGetItem(&pDsigCtx->manifestReferences, nReference));
+            if (pReference)
+            {
+                if (pReference->status == xmlSecDSigStatusSucceeded)
+                    ++nReferenceGood;
+            }
+        }
+
+        if (rs == 0 && pDsigCtx->status == xmlSecDSigStatusSucceeded && nReferenceCount == nReferenceGood)
+        {
+            aTemplate->setStatus(css::xml::crypto::SecurityOperationStatus_OPERATION_SUCCEEDED);
+            break;
+        }
+        else
+        {
+            aTemplate->setStatus(css::xml::crypto::SecurityOperationStatus_UNKNOWN);
+        }
+    }
+
+
+    //Unregistered the stream/URI binding
+    if( xUriBinding.is() )
+        xmlUnregisterStreamInputCallbacks() ;
+
+    //return valid ;
+    clearErrorRecorder();
+    return aTemplate;
+}
+
+/* XServiceInfo */
+OUString SAL_CALL XMLSignature_NssImpl::getImplementationName()
+{
+    return "com.sun.star.xml.crypto.XMLSignature";
+}
+
+/* XServiceInfo */
+sal_Bool SAL_CALL XMLSignature_NssImpl::supportsService(const OUString& rServiceName)
+{
+    const css::uno::Sequence<OUString> aServiceNames = getSupportedServiceNames();
+    for (OUString const & rCurrentServiceName : aServiceNames)
+    {
+        if (rCurrentServiceName == rServiceName)
+            return true;
+    }
+    return false;
+}
+
+/* XServiceInfo */
+Sequence<OUString> SAL_CALL XMLSignature_NssImpl::getSupportedServiceNames()
+{
+    return { "com.sun.star.xml.crypto.XMLSignature" };
+}
+
+extern "C" SAL_DLLPUBLIC_EXPORT uno::XInterface*
+com_sun_star_xml_crypto_XMLSignature_get_implementation(uno::XComponentContext* /*pCtx*/,
+                                                        uno::Sequence<uno::Any> const& /*rSeq*/)
+{
+    return cppu::acquire(new XMLSignature_NssImpl);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/xmlsec/saxhelper.cxx b/xmlsecurity/source/xmlsec/saxhelper.cxx
new file mode 100644
index 000000000..f34766666
--- /dev/null
+++ b/xmlsecurity/source/xmlsec/saxhelper.cxx
@@ -0,0 +1,361 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+
+#include <rtl/ustring.hxx>
+
+#include <xmlsec/saxhelper.hxx>
+#include <libxml/parserInternals.h>
+
+#include <com/sun/star/xml/csax/XMLAttribute.hpp>
+#include <com/sun/star/uno/Sequence.hxx>
+
+#ifndef XMLSEC_NO_XSLT
+#include "libxslt/xslt.h"
+#endif
+
+/**
+ * The return value is NULL terminated. The application has the responsibility to
+ * deallocate the return value.
+ */
+static xmlChar* ous_to_xmlstr( const OUString& oustr )
+{
+    OString ostr = OUStringToOString( oustr , RTL_TEXTENCODING_UTF8 ) ;
+    return xmlStrndup( reinterpret_cast<xmlChar const *>(ostr.getStr()), static_cast<int>(ostr.getLength()) ) ;
+}
+
+/**
+ * The return value is NULL terminated. The application has the responsibility to
+ * deallocate the return value.
+ */
+static xmlChar* ous_to_nxmlstr( const OUString& oustr, int& length )
+{
+    OString ostr = OUStringToOString( oustr , RTL_TEXTENCODING_UTF8 ) ;
+    length = ostr.getLength();
+
+    return xmlStrndup( reinterpret_cast<xmlChar const *>(ostr.getStr()), length ) ;
+}
+
+/**
+ * The return value and the referenced value must be NULL terminated.
+ * The application has the responsibility to deallocate the return value.
+ */
+static const xmlChar** attrlist_to_nxmlstr( const css::uno::Sequence< css::xml::csax::XMLAttribute >& aAttributes )
+{
+    xmlChar* attname = nullptr ;
+    xmlChar* attvalue = nullptr ;
+    const xmlChar** attrs = nullptr ;
+
+    sal_Int32 nLength = aAttributes.getLength();
+
+    if( nLength != 0 )
+    {
+        attrs = static_cast<const xmlChar**>(xmlMalloc( ( nLength * 2 + 2 ) * sizeof( xmlChar* ) ));
+    }
+    else
+    {
+        return nullptr ;
+    }
+
+    int i = 0;
+    for( const auto& rAttr : aAttributes )
+    {
+        attname = ous_to_xmlstr( rAttr.sName ) ;
+        attvalue = ous_to_xmlstr( rAttr.sValue ) ;
+
+        if( attname != nullptr && attvalue != nullptr )
+        {
+            attrs[i++] = attname ;
+            attrs[i++] = attvalue ;
+            attrs[i] = nullptr ;
+            attrs[i+1] = nullptr ;
+        }
+        else
+        {
+            if( attname != nullptr )
+                xmlFree( attname ) ;
+            if( attvalue != nullptr )
+                xmlFree( attvalue ) ;
+        }
+    }
+
+    return attrs ;
+}
+
+/**
+ * Constructor
+ *
+ * In this constructor, a libxml sax parser context is initialized. a libxml
+ * default sax handler is initialized with the context.
+ */
+SAXHelper::SAXHelper( )
+    : m_pParserCtxt( nullptr ),
+      m_pSaxHandler( nullptr )
+{
+    xmlInitParser() ;
+    LIBXML_TEST_VERSION ;
+
+    /*
+     * compile error:
+     * xmlLoadExtDtdDefaultValue = XML_DETECT_IDS | XML_COMPLETE_ATTRS ;
+     */
+    xmlSubstituteEntitiesDefault(0) ;
+
+#ifndef XMLSEC_NO_XSLT
+    xmlIndentTreeOutput = 1 ;
+#endif /* XMLSEC_NO_XSLT */
+
+    m_pParserCtxt = xmlNewParserCtxt() ;
+
+    if( m_pParserCtxt == nullptr )
+    {
+//      see issue i74334, we cannot call xmlCleanupParser when libxml is still used
+//      in other parts of the office.
+//      xmlCleanupParser() ;
+//      and neither can we call xsltCleanupGlobals()
+        throw css::uno::RuntimeException() ;
+    }
+
+    xmlSAXVersion(m_pParserCtxt->sax, 1);
+
+    if (m_pParserCtxt->inputTab != nullptr)
+    {
+        m_pParserCtxt->inputTab[0] = nullptr ;
+    }
+
+    if( m_pParserCtxt->sax == nullptr )
+    {
+        xmlFreeParserCtxt( m_pParserCtxt ) ;
+
+//      see issue i74334, we cannot call xmlCleanupParser when libxml is still used
+//      in other parts of the office.
+//      xmlCleanupParser() ;
+//      and neither can we call xsltCleanupGlobals()
+        m_pParserCtxt = nullptr ;
+        throw css::uno::RuntimeException() ;
+    }
+    else
+    {
+        m_pSaxHandler = m_pParserCtxt->sax ;
+
+        //Adjust the context
+        m_pParserCtxt->recovery = 1 ;
+    }
+}
+
+/**
+ * Destructor
+ *
+ * In this destructor, a libxml sax parser context is destructed. The XML tree
+ * in the context is not deallocated because the tree is bind with a document
+ * model by the setTargetDocument method, which delegate the target document to
+ * destruct the xml tree.
+ */
+SAXHelper::~SAXHelper() {
+    if( m_pParserCtxt != nullptr )
+    {
+        /*
+         * In the situation that no object refer the Document, this destructor
+         * must deallocate the Document memory
+         */
+        if( m_pSaxHandler == m_pParserCtxt->sax )
+        {
+            m_pSaxHandler = nullptr ;
+        }
+
+        xmlFreeParserCtxt( m_pParserCtxt ) ;
+        m_pParserCtxt = nullptr ;
+    }
+
+    if( m_pSaxHandler != nullptr )
+    {
+        xmlFree( m_pSaxHandler ) ;
+        m_pSaxHandler = nullptr ;
+    }
+//      see issue i74334, we cannot call xmlCleanupParser when libxml is still used
+//      in other parts of the office.
+//  xmlCleanupParser() ;
+}
+
+
+void SAXHelper::setCurrentNode(const xmlNodePtr pNode)
+{
+    /*
+     * This is really a black trick.
+     * When the current node is replaced, the nodeTab
+     * stack's top has to been replaced with the same
+     * node, in order to make compatibility.
+     */
+    m_pParserCtxt->nodeTab[m_pParserCtxt->nodeNr - 1]
+        = m_pParserCtxt->node
+            = pNode;
+}
+
+
+/**
+ * XDocumentHandler -- start an xml document
+ */
+void SAXHelper::startDocument()
+{
+    if( m_pParserCtxt == nullptr)
+    {
+        throw css::uno::RuntimeException() ;
+    }
+    /*
+     * Adjust inputTab
+     */
+    xmlParserInputPtr pInput = xmlNewInputStream( m_pParserCtxt ) ;
+
+    if( m_pParserCtxt->inputTab != nullptr && m_pParserCtxt->inputMax != 0 )
+    {
+        m_pParserCtxt->inputTab[0] = pInput ;
+        m_pParserCtxt->input = pInput ;
+    }
+
+    m_pSaxHandler->startDocument( m_pParserCtxt ) ;
+
+    if( m_pParserCtxt->myDoc == nullptr )
+    {
+        throw css::uno::RuntimeException() ;
+    }
+}
+
+/**
+ * XDocumentHandler -- end an xml document
+ */
+void SAXHelper::endDocument()
+{
+    m_pSaxHandler->endDocument( m_pParserCtxt ) ;
+}
+
+/**
+ * XDocumentHandler -- start an xml element
+ */
+void SAXHelper::startElement(
+    const OUString& aName,
+    const css::uno::Sequence< css::xml::csax::XMLAttribute >& aAttributes )
+{
+    const xmlChar* fullName = nullptr ;
+    const xmlChar** attrs = nullptr ;
+
+    fullName = ous_to_xmlstr( aName ) ;
+    attrs = attrlist_to_nxmlstr( aAttributes ) ;
+
+    if( fullName != nullptr || attrs != nullptr )
+    {
+        m_pSaxHandler->startElement( m_pParserCtxt , fullName , attrs ) ;
+    }
+
+    if( fullName != nullptr )
+    {
+        xmlFree( const_cast<xmlChar*>(fullName) ) ;
+        fullName = nullptr ;
+    }
+
+    if( attrs != nullptr )
+    {
+        for( int i = 0 ; attrs[i] != nullptr ; ++i )
+        {
+            xmlFree( const_cast<xmlChar*>(attrs[i]) ) ;
+            attrs[i] = nullptr ;
+        }
+
+        xmlFree( static_cast<void*>(attrs) ) ;
+        attrs = nullptr ;
+    }
+}
+
+/**
+ * XDocumentHandler -- end an xml element
+ */
+void SAXHelper::endElement( const OUString& aName )
+{
+    xmlChar* fullname = ous_to_xmlstr( aName ) ;
+    m_pSaxHandler->endElement( m_pParserCtxt , fullname ) ;
+
+    if( fullname != nullptr )
+    {
+        xmlFree( fullname ) ;
+        fullname = nullptr ;
+    }
+}
+
+/**
+ * XDocumentHandler -- an xml element or cdata characters
+ */
+void SAXHelper::characters( const OUString& aChars )
+{
+    const xmlChar* chars = nullptr ;
+    int length = 0 ;
+
+    chars = ous_to_nxmlstr( aChars, length ) ;
+    m_pSaxHandler->characters( m_pParserCtxt , chars , length ) ;
+
+    if( chars != nullptr )
+    {
+        xmlFree( const_cast<xmlChar*>(chars) ) ;
+    }
+}
+
+/**
+ * XDocumentHandler -- ignorable xml white space
+ */
+void SAXHelper::ignorableWhitespace( const OUString& aWhitespaces )
+{
+    const xmlChar* chars = nullptr ;
+    int length = 0 ;
+
+    chars = ous_to_nxmlstr( aWhitespaces, length ) ;
+    m_pSaxHandler->ignorableWhitespace( m_pParserCtxt , chars , length ) ;
+
+    if( chars != nullptr )
+    {
+        xmlFree( const_cast<xmlChar*>(chars) ) ;
+    }
+}
+
+/**
+ * XDocumentHandler -- preprocessing instruction
+ */
+void SAXHelper::processingInstruction(
+    const OUString& aTarget,
+    const OUString& aData )
+{
+    xmlChar* target = nullptr ;
+    xmlChar* data = nullptr ;
+
+    target = ous_to_xmlstr( aTarget ) ;
+    data = ous_to_xmlstr( aData ) ;
+
+    m_pSaxHandler->processingInstruction( m_pParserCtxt , target , data ) ;
+
+    if( target != nullptr )
+    {
+        xmlFree( target ) ;
+        target = nullptr ;
+    }
+
+    if( data != nullptr )
+    {
+        xmlFree( data ) ;
+        data = nullptr ;
+    }
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/xmlsec/xmldocumentwrapper_xmlsecimpl.cxx b/xmlsecurity/source/xmlsec/xmldocumentwrapper_xmlsecimpl.cxx
new file mode 100644
index 000000000..2d98e44d0
--- /dev/null
+++ b/xmlsecurity/source/xmlsec/xmldocumentwrapper_xmlsecimpl.cxx
@@ -0,0 +1,906 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <sal/config.h>
+
+#include <osl/diagnose.h>
+#include <com/sun/star/uno/XComponentContext.hpp>
+#include <com/sun/star/xml/crypto/sax/XSAXEventKeeper.hpp>
+#include <cppuhelper/supportsservice.hxx>
+#include <xmlsec/xmldocumentwrapper_xmlsecimpl.hxx>
+#include "xmlelementwrapper_xmlsecimpl.hxx"
+
+#include <xmloff/attrlist.hxx>
+
+#ifdef UNX
+#define stricmp strcasecmp
+#endif
+
+using namespace com::sun::star;
+
+#define STRXMLNS "xmlns"
+
+/* used by the recursiveDelete method */
+#define NODE_REMOVED    0
+#define NODE_NOTREMOVED 1
+#define NODE_STOPPED     2
+
+XMLDocumentWrapper_XmlSecImpl::XMLDocumentWrapper_XmlSecImpl()
+    : m_nCurrentPosition(0)
+    , m_pStopAtNode(nullptr)
+    , m_pCurrentReservedNode(nullptr)
+    , m_nReservedNodeIndex(0)
+{
+    saxHelper.startDocument();
+    m_pDocument = saxHelper.getDocument();
+
+    /*
+     * creates the virtual root element
+     */
+    saxHelper.startElement("root", uno::Sequence<css::xml::csax::XMLAttribute>());
+
+    m_pRootElement = saxHelper.getCurrentNode();
+    m_pCurrentElement = m_pRootElement;
+}
+
+XMLDocumentWrapper_XmlSecImpl::~XMLDocumentWrapper_XmlSecImpl()
+{
+    saxHelper.endDocument();
+    xmlFreeDoc(m_pDocument);
+}
+
+void XMLDocumentWrapper_XmlSecImpl::getNextSAXEvent()
+/****** XMLDocumentWrapper_XmlSecImpl/getNextSAXEvent *************************
+ *
+ *   NAME
+ *  getNextSAXEvent -- Prepares the next SAX event to be manipulate
+ *
+ *   FUNCTION
+ *  When converting the document into SAX events, this method is used to
+ *  decide the next SAX event to be generated.
+ *  Two member variables are checked to make the decision, the
+ *  m_pCurrentElement and the m_nCurrentPosition.
+ *  The m_pCurrentElement represents the node which have been covered, and
+ *  the m_nCurrentPosition represents the event which have been sent.
+ *  For example, suppose that the m_pCurrentElement
+ *  points to element A, and the m_nCurrentPosition equals to
+ *  NODEPOSITION_STARTELEMENT, then the next SAX event should be the
+ *  endElement for element A if A has no child, or startElement for the
+ *  first child element of element A otherwise.
+ *  The m_nCurrentPosition can be one of following values:
+ *  NODEPOSITION_STARTELEMENT for startElement;
+ *  NODEPOSITION_ENDELEMENT for endElement;
+ *  NODEPOSITION_NORMAL for other SAX events;
+ ******************************************************************************/
+{
+    OSL_ASSERT( m_pCurrentElement != nullptr );
+
+        /*
+         * Get the next event through tree order.
+         *
+         * if the current event is a startElement, then the next
+         * event depends on whether or not the current node has
+         * children.
+         */
+    if (m_nCurrentPosition == NODEPOSITION_STARTELEMENT)
+    {
+            /*
+             * If the current node has children, then its first child
+             * should be next current node, and the next event will be
+             * startElement or characters(PI) based on that child's node
+             * type. Otherwise, the endElement of current node is the
+             * next event.
+             */
+        if (m_pCurrentElement->children != nullptr)
+        {
+            m_pCurrentElement = m_pCurrentElement->children;
+            m_nCurrentPosition
+                = (m_pCurrentElement->type == XML_ELEMENT_NODE)?
+                    NODEPOSITION_STARTELEMENT:NODEPOSITION_NORMAL;
+        }
+        else
+        {
+            m_nCurrentPosition = NODEPOSITION_ENDELEMENT;
+        }
+    }
+        /*
+         * if the current event is a not startElement, then the next
+         * event depends on whether or not the current node has
+         * following sibling.
+         */
+    else if (m_nCurrentPosition == NODEPOSITION_ENDELEMENT || m_nCurrentPosition == NODEPOSITION_NORMAL)
+    {
+        xmlNodePtr pNextSibling = m_pCurrentElement->next;
+
+            /*
+             * If the current node has following sibling, that sibling
+             * should be next current node, and the next event will be
+             * startElement or characters(PI) based on that sibling's node
+             * type. Otherwise, the endElement of current node's parent
+             * becomes the next event.
+             */
+        if (pNextSibling != nullptr)
+        {
+            m_pCurrentElement = pNextSibling;
+            m_nCurrentPosition
+                = (m_pCurrentElement->type == XML_ELEMENT_NODE)?
+                    NODEPOSITION_STARTELEMENT:NODEPOSITION_NORMAL;
+        }
+        else
+        {
+            m_pCurrentElement = m_pCurrentElement->parent;
+            m_nCurrentPosition = NODEPOSITION_ENDELEMENT;
+        }
+    }
+}
+
+void XMLDocumentWrapper_XmlSecImpl::sendStartElement(
+    const uno::Reference< css::xml::sax::XDocumentHandler >& xHandler,
+    const uno::Reference< css::xml::sax::XDocumentHandler >& xHandler2,
+    const xmlNodePtr pNode)
+/****** XMLDocumentWrapper_XmlSecImpl/sendStartElement ************************
+ *
+ *   NAME
+ *  sendStartElement -- Constructs a startElement SAX event
+ *
+ *   FUNCTION
+ *  Used when converting the document into SAX event stream.
+ *  This method constructs a startElement SAX event for a particular
+ *  element, then calls the startElement methods of the XDocumentHandlers.
+ *
+ *   INPUTS
+ *  xHandler -  the first XDocumentHandler interface to receive the
+ *          startElement SAX event. It can be NULL.
+ *  xHandler2 - the second XDocumentHandler interface to receive the
+ *          startElement SAX event. It can't be NULL.
+ *  pNode -     the node on which the startElement should be generated.
+ *          This node must be an element type.
+ ******************************************************************************/
+{
+    SvXMLAttributeList* pAttributeList = new SvXMLAttributeList();
+    uno::Reference < css::xml::sax::XAttributeList > xAttrList(pAttributeList);
+
+    xmlNsPtr pNsDef = pNode->nsDef;
+
+    while (pNsDef != nullptr)
+    {
+        const xmlChar* pNsPrefix = pNsDef->prefix;
+        const xmlChar* pNsHref = pNsDef->href;
+
+        if (pNsDef->prefix == nullptr)
+        {
+            pAttributeList->AddAttribute(
+                STRXMLNS,
+                OUString::fromUtf8(reinterpret_cast<char const *>(pNsHref)));
+        }
+        else
+        {
+            pAttributeList->AddAttribute(
+                STRXMLNS ":"
+                +OUString::fromUtf8(reinterpret_cast<char const *>(pNsPrefix)),
+                OUString::fromUtf8(reinterpret_cast<char const *>(pNsHref)));
+        }
+
+        pNsDef = pNsDef->next;
+    }
+
+    xmlAttrPtr pAttr = pNode->properties;
+
+    while (pAttr != nullptr)
+    {
+        const xmlChar* pAttrName = pAttr->name;
+        xmlNsPtr pAttrNs = pAttr->ns;
+
+        OUString ouAttrName;
+        if (pAttrNs == nullptr)
+        {
+            ouAttrName = OUString::fromUtf8(reinterpret_cast<char const *>(pAttrName));
+        }
+        else
+        {
+            ouAttrName = OUString::fromUtf8(reinterpret_cast<char const *>(pAttrNs->prefix))
+                + ":" + OUString::fromUtf8(reinterpret_cast<char const *>(pAttrName));
+        }
+
+        pAttributeList->AddAttribute(
+            ouAttrName,
+            OUString::fromUtf8(reinterpret_cast<char*>(pAttr->children->content)));
+        pAttr = pAttr->next;
+    }
+
+    OString sNodeName = getNodeQName(pNode);
+
+    if (xHandler.is())
+    {
+        xHandler->startElement(
+            OUString::fromUtf8(sNodeName),
+            xAttrList);
+    }
+
+    xHandler2->startElement(
+        OUString::fromUtf8(sNodeName),
+        xAttrList);
+}
+
+void XMLDocumentWrapper_XmlSecImpl::sendEndElement(
+    const uno::Reference< css::xml::sax::XDocumentHandler >& xHandler,
+    const uno::Reference< css::xml::sax::XDocumentHandler >& xHandler2,
+    const xmlNodePtr pNode)
+/****** XMLDocumentWrapper_XmlSecImpl/sendEndElement **************************
+ *
+ *   NAME
+ *  sendEndElement -- Constructs an endElement SAX event
+ *
+ *   FUNCTION
+ *  Used when converting the document into SAX event stream.
+ *  This method constructs an endElement SAX event for a particular
+ *  element, then calls the endElement methods of the XDocumentHandlers.
+ *
+ *   INPUTS
+ *  xHandler -  the first XDocumentHandler interface to receive the
+ *          endElement SAX event. It can be NULL.
+ *  xHandler2 - the second XDocumentHandler interface to receive the
+ *          endElement SAX event. It can't be NULL.
+ *  pNode -     the node on which the endElement should be generated.
+ *          This node must be an element type.
+ ******************************************************************************/
+{
+    OString sNodeName = getNodeQName(pNode);
+
+    if (xHandler.is())
+    {
+        xHandler->endElement(OUString::fromUtf8(sNodeName));
+    }
+
+    xHandler2->endElement(OUString::fromUtf8(sNodeName));
+}
+
+void XMLDocumentWrapper_XmlSecImpl::sendNode(
+    const uno::Reference< css::xml::sax::XDocumentHandler >& xHandler,
+    const uno::Reference< css::xml::sax::XDocumentHandler >& xHandler2,
+    const xmlNodePtr pNode)
+/****** XMLDocumentWrapper_XmlSecImpl/sendNode ********************************
+ *
+ *   NAME
+ *  sendNode -- Constructs a characters SAX event or a
+ *  processingInstruction SAX event
+ *
+ *   FUNCTION
+ *  Used when converting the document into SAX event stream.
+ *  This method constructs a characters SAX event or a
+ *  processingInstructionfor SAX event based on the type of a particular
+ *  element, then calls the corresponding methods of the XDocumentHandlers.
+ *
+ *   INPUTS
+ *  xHandler -  the first XDocumentHandler interface to receive the
+ *          SAX event. It can be NULL.
+ *  xHandler2 - the second XDocumentHandler interface to receive the
+ *          SAX event. It can't be NULL.
+ *  pNode -     the node on which the endElement should be generated.
+ *          If it is a text node, then a characters SAX event is
+ *          generated; if it is a PI node, then a
+ *          processingInstructionfor SAX event is generated.
+ ******************************************************************************/
+{
+    xmlElementType type = pNode->type;
+
+    if (type == XML_TEXT_NODE)
+    {
+        if (xHandler.is())
+        {
+            xHandler->characters(OUString::fromUtf8(reinterpret_cast<char*>(pNode->content)));
+        }
+
+        xHandler2->characters(OUString::fromUtf8(reinterpret_cast<char*>(pNode->content)));
+    }
+    else if (type == XML_PI_NODE)
+    {
+        if (xHandler.is())
+        {
+            xHandler->processingInstruction(
+                OUString::fromUtf8(reinterpret_cast<char const *>(pNode->name)),
+                OUString::fromUtf8(reinterpret_cast<char const *>(pNode->content)));
+        }
+
+        xHandler2->processingInstruction(
+            OUString::fromUtf8(reinterpret_cast<char const *>(pNode->name)),
+            OUString::fromUtf8(reinterpret_cast<char*>(pNode->content)));
+    }
+}
+
+OString XMLDocumentWrapper_XmlSecImpl::getNodeQName(const xmlNodePtr pNode)
+/****** XMLDocumentWrapper_XmlSecImpl/getNodeQName ****************************
+ *
+ *   NAME
+ *  getNodeQName -- Retrieves the qualified name of a node
+ *
+ *   INPUTS
+ *  pNode - the node whose name will be retrieved
+ *
+ *   RESULT
+ *  name - the node's qualified name
+ ******************************************************************************/
+{
+    OString sNodeName(reinterpret_cast<const char*>(pNode->name));
+    if (pNode->ns != nullptr)
+    {
+        xmlNsPtr pNs = pNode->ns;
+
+        if (pNs->prefix != nullptr)
+        {
+            OString sPrefix(reinterpret_cast<const char*>(pNs->prefix));
+            sNodeName = sPrefix + ":" + sNodeName;
+        }
+    }
+
+    return sNodeName;
+}
+
+xmlNodePtr XMLDocumentWrapper_XmlSecImpl::checkElement( const uno::Reference< css::xml::wrapper::XXMLElementWrapper >& xXMLElement)
+/****** XMLDocumentWrapper_XmlSecImpl/checkElement ****************************
+ *
+ *   NAME
+ *  checkElement -- Retrieves the node wrapped by an XXMLElementWrapper
+ *  interface
+ *
+ *   INPUTS
+ *  xXMLElement -   the XXMLElementWrapper interface wrapping a node
+ *
+ *   RESULT
+ *  node - the node wrapped in the XXMLElementWrapper interface
+ ******************************************************************************/
+{
+    xmlNodePtr rc = nullptr;
+
+    if (xXMLElement.is())
+    {
+        uno::Reference< css::lang::XUnoTunnel > xNodTunnel( xXMLElement, uno::UNO_QUERY_THROW ) ;
+        XMLElementWrapper_XmlSecImpl* pElement
+            = reinterpret_cast<XMLElementWrapper_XmlSecImpl*>(
+                sal::static_int_cast<sal_uIntPtr>(
+                    xNodTunnel->getSomething(
+                        XMLElementWrapper_XmlSecImpl::getUnoTunnelId() ))) ;
+
+        if( pElement == nullptr ) {
+            throw uno::RuntimeException() ;
+        }
+
+        rc = pElement->getNativeElement();
+    }
+
+    return rc;
+}
+
+sal_Int32 XMLDocumentWrapper_XmlSecImpl::recursiveDelete(
+    const xmlNodePtr pNode)
+/****** XMLDocumentWrapper_XmlSecImpl/recursiveDelete *************************
+ *
+ *   NAME
+ *  recursiveDelete -- Deletes a particular node with its branch.
+ *
+ *   FUNCTION
+ *  Deletes a particular node with its branch, while reserving the nodes
+ *  (and their branches) listed in the m_aReservedNodes.
+ *  The deletion process is performed in the tree order, that is, a node
+ *  is deleted after its previous sibling node is deleted, a parent node
+ *  is deleted after its branch is deleted.
+ *  During the deletion process when the m_pStopAtNode is reached, the
+ *  progress is interrupted at once.
+ *
+ *   INPUTS
+ *  pNode - the node to be deleted
+ *
+ *   RESULT
+ *  result -    the result of the deletion process, can be one of following
+ *          values:
+ *          NODE_STOPPED - the process is interrupted by meeting the
+ *              m_pStopAtNode
+ *          NODE_NOTREMOVED - the pNode is not completely removed
+ *              because there is its descendant in the
+ *              m_aReservedNodes list
+ *          NODE_REMOVED - the pNode and its branch are completely
+ *              removed
+ *
+ *   NOTES
+ *  The node in the m_aReservedNodes list must be in the tree order, otherwise
+ *  the result is unpredictable.
+ ******************************************************************************/
+{
+    if (pNode == m_pStopAtNode)
+    {
+        return NODE_STOPPED;
+    }
+
+    if (pNode != m_pCurrentReservedNode)
+    {
+        xmlNodePtr pChild = pNode->children;
+
+        xmlNodePtr pNextSibling;
+        bool bIsRemoved = true;
+        sal_Int32 nResult;
+
+        while( pChild != nullptr )
+        {
+            pNextSibling = pChild->next;
+            nResult = recursiveDelete(pChild);
+
+            switch (nResult)
+            {
+            case NODE_STOPPED:
+                return NODE_STOPPED;
+            case NODE_NOTREMOVED:
+                bIsRemoved = false;
+                break;
+            case NODE_REMOVED:
+                removeNode(pChild);
+                break;
+            default:
+                throw uno::RuntimeException();
+            }
+
+            pChild = pNextSibling;
+        }
+
+        if (pNode == m_pCurrentElement)
+        {
+            bIsRemoved = false;
+        }
+
+        return bIsRemoved?NODE_REMOVED:NODE_NOTREMOVED;
+    }
+    else
+    {
+        getNextReservedNode();
+        return NODE_NOTREMOVED;
+    }
+}
+
+void XMLDocumentWrapper_XmlSecImpl::getNextReservedNode()
+/****** XMLDocumentWrapper_XmlSecImpl/getNextReservedNode *********************
+ *
+ *   NAME
+ *  getNextReservedNode -- Highlights the next reserved node in the
+ *  reserved node list
+ *
+ *   FUNCTION
+ *  The m_aReservedNodes array holds a node list, while the
+ *  m_pCurrentReservedNode points to the one currently highlighted.
+ *  This method is used to highlight the next node in the node list.
+ *  This method is called at the time when the current highlighted node
+ *  has been already processed, and the next node should be ready.
+ ******************************************************************************/
+{
+    if (m_nReservedNodeIndex < m_aReservedNodes.getLength())
+    {
+        m_pCurrentReservedNode = checkElement( m_aReservedNodes[m_nReservedNodeIndex] );
+        m_nReservedNodeIndex ++;
+    }
+    else
+    {
+        m_pCurrentReservedNode = nullptr;
+    }
+}
+
+void XMLDocumentWrapper_XmlSecImpl::removeNode(const xmlNodePtr pNode) const
+/****** XMLDocumentWrapper_XmlSecImpl/removeNode ******************************
+ *
+ *   NAME
+ *  removeNode -- Deletes a node with its branch unconditionally
+ *
+ *   FUNCTION
+ *  Delete the node along with its branch from the document.
+ *
+ *   INPUTS
+ *  pNode - the node to be deleted
+ ******************************************************************************/
+{
+    /* you can't remove the current node */
+    OSL_ASSERT( m_pCurrentElement != pNode );
+
+    xmlAttrPtr pAttr = pNode->properties;
+
+    while (pAttr != nullptr)
+    {
+        if (!stricmp(reinterpret_cast<char const *>(pAttr->name), "id"))
+        {
+            xmlRemoveID(m_pDocument, pAttr);
+        }
+
+        pAttr = pAttr->next;
+    }
+
+    xmlUnlinkNode(pNode);
+    xmlFreeNode(pNode);
+}
+
+void XMLDocumentWrapper_XmlSecImpl::buildIDAttr(xmlNodePtr pNode) const
+/****** XMLDocumentWrapper_XmlSecImpl/buildIDAttr *****************************
+ *
+ *   NAME
+ *  buildIDAttr -- build the ID attribute of a node
+ *
+ *   INPUTS
+ *  pNode - the node whose id attribute will be built
+ ******************************************************************************/
+{
+    xmlAttrPtr idAttr = xmlHasProp( pNode, reinterpret_cast<const unsigned char *>("id") );
+    if (idAttr == nullptr)
+    {
+        idAttr = xmlHasProp( pNode, reinterpret_cast<const unsigned char *>("Id") );
+    }
+
+    if (idAttr != nullptr)
+    {
+        xmlChar* idValue = xmlNodeListGetString( m_pDocument, idAttr->children, 1 ) ;
+        xmlAddID( nullptr, m_pDocument, idValue, idAttr );
+    }
+}
+
+void XMLDocumentWrapper_XmlSecImpl::rebuildIDLink(xmlNodePtr pNode) const
+/****** XMLDocumentWrapper_XmlSecImpl/rebuildIDLink ***************************
+ *
+ *   NAME
+ *  rebuildIDLink -- rebuild the ID link for the branch
+ *
+ *   INPUTS
+ *  pNode - the node, from which the branch will be rebuilt
+ ******************************************************************************/
+{
+    if (pNode != nullptr && pNode->type == XML_ELEMENT_NODE)
+    {
+        buildIDAttr( pNode );
+
+        xmlNodePtr child = pNode->children;
+        while (child != nullptr)
+        {
+            rebuildIDLink(child);
+            child = child->next;
+        }
+    }
+}
+
+/* XXMLDocumentWrapper */
+uno::Reference< css::xml::wrapper::XXMLElementWrapper > SAL_CALL XMLDocumentWrapper_XmlSecImpl::getCurrentElement(  )
+{
+    XMLElementWrapper_XmlSecImpl* pElement = new XMLElementWrapper_XmlSecImpl(m_pCurrentElement);
+    return uno::Reference< css::xml::wrapper::XXMLElementWrapper >(pElement);
+}
+
+void SAL_CALL XMLDocumentWrapper_XmlSecImpl::setCurrentElement( const uno::Reference< css::xml::wrapper::XXMLElementWrapper >& element )
+{
+    m_pCurrentElement = checkElement( element );
+    saxHelper.setCurrentNode( m_pCurrentElement );
+}
+
+void SAL_CALL XMLDocumentWrapper_XmlSecImpl::removeCurrentElement(  )
+{
+    OSL_ASSERT( m_pCurrentElement != nullptr );
+
+    xmlNodePtr pOldCurrentElement = m_pCurrentElement;
+
+    /*
+     * pop the top node in the parser context's
+     * nodeTab stack, then the parent of that node will
+     * automatically become the new stack top, and
+     * the current node as well.
+     */
+    saxHelper.endElement(OUString::fromUtf8(reinterpret_cast<char const *>(pOldCurrentElement->name)));
+    m_pCurrentElement = saxHelper.getCurrentNode();
+
+    /*
+     * remove the node
+     */
+    removeNode(pOldCurrentElement);
+}
+
+sal_Bool SAL_CALL XMLDocumentWrapper_XmlSecImpl::isCurrent( const uno::Reference< css::xml::wrapper::XXMLElementWrapper >& node )
+{
+    xmlNodePtr pNode = checkElement(node);
+    return (pNode == m_pCurrentElement);
+}
+
+sal_Bool SAL_CALL XMLDocumentWrapper_XmlSecImpl::isCurrentElementEmpty(  )
+{
+    bool rc = false;
+
+    if (m_pCurrentElement->children == nullptr)
+    {
+        rc = true;
+    }
+
+    return rc;
+}
+
+OUString SAL_CALL XMLDocumentWrapper_XmlSecImpl::getNodeName( const uno::Reference< css::xml::wrapper::XXMLElementWrapper >& node )
+{
+    xmlNodePtr pNode = checkElement(node);
+    return OUString::fromUtf8(reinterpret_cast<char const *>(pNode->name));
+}
+
+void SAL_CALL XMLDocumentWrapper_XmlSecImpl::clearUselessData(
+    const uno::Reference< css::xml::wrapper::XXMLElementWrapper >& node,
+    const uno::Sequence< uno::Reference< css::xml::wrapper::XXMLElementWrapper > >& reservedDescendants,
+    const uno::Reference< css::xml::wrapper::XXMLElementWrapper >& stopAtNode )
+{
+    xmlNodePtr pTargetNode = checkElement(node);
+
+    m_pStopAtNode = checkElement(stopAtNode);
+    m_aReservedNodes = reservedDescendants;
+    m_nReservedNodeIndex = 0;
+
+    getNextReservedNode();
+
+    recursiveDelete(pTargetNode);
+}
+
+void SAL_CALL XMLDocumentWrapper_XmlSecImpl::collapse( const uno::Reference< css::xml::wrapper::XXMLElementWrapper >& node )
+{
+    xmlNodePtr pTargetNode = checkElement(node);
+    xmlNodePtr pParent;
+
+    while (pTargetNode != nullptr)
+    {
+        if (pTargetNode->children != nullptr || pTargetNode == m_pCurrentElement)
+        {
+            break;
+        }
+
+        pParent = pTargetNode->parent;
+        removeNode(pTargetNode);
+        pTargetNode = pParent;
+    }
+}
+
+void SAL_CALL XMLDocumentWrapper_XmlSecImpl::getTree( const uno::Reference< css::xml::sax::XDocumentHandler >& handler )
+{
+    if (m_pRootElement != nullptr)
+    {
+        xmlNodePtr pTempCurrentElement = m_pCurrentElement;
+        sal_Int32 nTempCurrentPosition = m_nCurrentPosition;
+
+        m_pCurrentElement = m_pRootElement;
+
+        m_nCurrentPosition = NODEPOSITION_STARTELEMENT;
+
+        while(true)
+        {
+            switch (m_nCurrentPosition)
+            {
+            case NODEPOSITION_STARTELEMENT:
+                sendStartElement(nullptr, handler, m_pCurrentElement);
+                break;
+            case NODEPOSITION_ENDELEMENT:
+                sendEndElement(nullptr, handler, m_pCurrentElement);
+                break;
+            case NODEPOSITION_NORMAL:
+                sendNode(nullptr, handler, m_pCurrentElement);
+                break;
+            }
+
+            if ( (m_pCurrentElement == m_pRootElement) && (m_nCurrentPosition == NODEPOSITION_ENDELEMENT ))
+            {
+                break;
+            }
+
+            getNextSAXEvent();
+        }
+
+        m_pCurrentElement = pTempCurrentElement;
+        m_nCurrentPosition = nTempCurrentPosition;
+    }
+}
+
+void SAL_CALL XMLDocumentWrapper_XmlSecImpl::generateSAXEvents(
+    const uno::Reference< css::xml::sax::XDocumentHandler >& handler,
+    const uno::Reference< css::xml::sax::XDocumentHandler >& xEventKeeperHandler,
+    const uno::Reference< css::xml::wrapper::XXMLElementWrapper >& startNode,
+    const uno::Reference< css::xml::wrapper::XXMLElementWrapper >& endNode )
+{
+        /*
+         * The first SAX event is the startElement of the startNode
+         * element.
+         */
+    bool bHasCurrentElementChild = (m_pCurrentElement->children != nullptr);
+
+    xmlNodePtr pTempCurrentElement = m_pCurrentElement;
+
+    m_pCurrentElement = checkElement(startNode);
+
+    if (m_pCurrentElement->type == XML_ELEMENT_NODE)
+    {
+        m_nCurrentPosition = NODEPOSITION_STARTELEMENT;
+    }
+    else
+    {
+        m_nCurrentPosition = NODEPOSITION_NORMAL;
+    }
+
+    xmlNodePtr pEndNode = checkElement(endNode);
+
+    uno::Reference < css::xml::crypto::sax::XSAXEventKeeper > xSAXEventKeeper( xEventKeeperHandler, uno::UNO_QUERY );
+
+    uno::Reference< css::xml::sax::XDocumentHandler > xHandler = handler;
+
+    while(true)
+    {
+        switch (m_nCurrentPosition)
+        {
+        case NODEPOSITION_STARTELEMENT:
+            sendStartElement(xHandler, xEventKeeperHandler, m_pCurrentElement);
+            break;
+        case NODEPOSITION_ENDELEMENT:
+            sendEndElement(xHandler, xEventKeeperHandler, m_pCurrentElement);
+            break;
+        case NODEPOSITION_NORMAL:
+            sendNode(xHandler, xEventKeeperHandler, m_pCurrentElement);
+            break;
+        default:
+            throw uno::RuntimeException();
+        }
+
+        if (xSAXEventKeeper->isBlocking())
+        {
+            xHandler = nullptr;
+        }
+
+        if (pEndNode == nullptr &&
+            ((bHasCurrentElementChild && m_pCurrentElement == xmlGetLastChild(pTempCurrentElement) && m_nCurrentPosition != NODEPOSITION_STARTELEMENT) ||
+             (!bHasCurrentElementChild && m_pCurrentElement == pTempCurrentElement && m_nCurrentPosition == NODEPOSITION_STARTELEMENT)))
+        {
+            break;
+        }
+
+        getNextSAXEvent();
+
+            /*
+             * If there is an end point specified, then check whether
+             * the current node equals to the end point. If so, stop
+             * generating.
+             */
+        if (pEndNode != nullptr && m_pCurrentElement == pEndNode)
+        {
+            break;
+        }
+    }
+
+    m_pCurrentElement = pTempCurrentElement;
+}
+
+void SAL_CALL XMLDocumentWrapper_XmlSecImpl::rebuildIDLink(
+    const css::uno::Reference< css::xml::wrapper::XXMLElementWrapper >& node )
+{
+    xmlNodePtr pNode = checkElement( node );
+    rebuildIDLink(pNode);
+}
+
+
+/* css::xml::sax::XDocumentHandler */
+void SAL_CALL XMLDocumentWrapper_XmlSecImpl::startDocument(  )
+{
+}
+
+void SAL_CALL XMLDocumentWrapper_XmlSecImpl::endDocument(  )
+{
+}
+
+void SAL_CALL XMLDocumentWrapper_XmlSecImpl::startElement( const OUString& aName, const uno::Reference< css::xml::sax::XAttributeList >& xAttribs )
+{
+    sal_Int32 nLength = xAttribs->getLength();
+    uno::Sequence< css::xml::csax::XMLAttribute > aAttributes (nLength);
+
+    for (int i = 0; i < nLength; ++i)
+    {
+        aAttributes[i].sName = xAttribs->getNameByIndex(static_cast<short>(i));
+        aAttributes[i].sValue =xAttribs->getValueByIndex(static_cast<short>(i));
+    }
+
+    compressedStartElement(aName, aAttributes);
+}
+
+void SAL_CALL XMLDocumentWrapper_XmlSecImpl::endElement( const OUString& aName )
+{
+    saxHelper.endElement(aName);
+    m_pCurrentElement = saxHelper.getCurrentNode();
+}
+
+void SAL_CALL XMLDocumentWrapper_XmlSecImpl::characters( const OUString& aChars )
+{
+    saxHelper.characters(aChars);
+}
+
+void SAL_CALL XMLDocumentWrapper_XmlSecImpl::ignorableWhitespace( const OUString& aWhitespaces )
+{
+    saxHelper.ignorableWhitespace(aWhitespaces);
+}
+
+void SAL_CALL XMLDocumentWrapper_XmlSecImpl::processingInstruction( const OUString& aTarget, const OUString& aData )
+{
+    saxHelper.processingInstruction(aTarget, aData);
+}
+
+void SAL_CALL XMLDocumentWrapper_XmlSecImpl::setDocumentLocator( const uno::Reference< css::xml::sax::XLocator >& )
+{
+}
+
+/* XCompressedDocumentHandler */
+void SAL_CALL XMLDocumentWrapper_XmlSecImpl::compressedStartDocument(  )
+{
+}
+
+void SAL_CALL XMLDocumentWrapper_XmlSecImpl::compressedEndDocument(  )
+{
+}
+
+void SAL_CALL XMLDocumentWrapper_XmlSecImpl::compressedStartElement( const OUString& aName, const uno::Sequence< css::xml::csax::XMLAttribute >& aAttributes )
+{
+    saxHelper.startElement(aName, aAttributes);
+    m_pCurrentElement = saxHelper.getCurrentNode();
+
+    buildIDAttr( m_pCurrentElement );
+}
+
+void SAL_CALL XMLDocumentWrapper_XmlSecImpl::compressedEndElement( const OUString& aName )
+{
+    endElement( aName );
+}
+
+void SAL_CALL XMLDocumentWrapper_XmlSecImpl::compressedCharacters( const OUString& aChars )
+{
+    characters( aChars );
+}
+
+void SAL_CALL XMLDocumentWrapper_XmlSecImpl::compressedIgnorableWhitespace( const OUString& aWhitespaces )
+{
+    ignorableWhitespace( aWhitespaces );
+}
+
+void SAL_CALL XMLDocumentWrapper_XmlSecImpl::compressedProcessingInstruction( const OUString& aTarget, const OUString& aData )
+{
+    processingInstruction( aTarget, aData );
+}
+
+void SAL_CALL XMLDocumentWrapper_XmlSecImpl::compressedSetDocumentLocator( sal_Int32 /*columnNumber*/, sal_Int32 /*lineNumber*/, const OUString& /*publicId*/, const OUString& /*systemId*/ )
+{
+}
+
+/* XServiceInfo */
+OUString SAL_CALL XMLDocumentWrapper_XmlSecImpl::getImplementationName(  )
+{
+    return "com.sun.star.xml.wrapper.XMLDocumentWrapper";
+}
+
+sal_Bool SAL_CALL XMLDocumentWrapper_XmlSecImpl::supportsService( const OUString& rServiceName )
+{
+    return cppu::supportsService( this, rServiceName );
+}
+
+uno::Sequence< OUString > SAL_CALL XMLDocumentWrapper_XmlSecImpl::getSupportedServiceNames(  )
+{
+    uno::Sequence<OUString> aRet{ "com.sun.star.xml.wrapper.XMLDocumentWrapper" };
+    return aRet;
+}
+
+extern "C" SAL_DLLPUBLIC_EXPORT uno::XInterface*
+com_sun_star_xml_wrapper_XMLDocumentWrapper_get_implementation(
+    uno::XComponentContext* /*pCtx*/, uno::Sequence<uno::Any> const& /*rSeq*/)
+{
+    return cppu::acquire(new XMLDocumentWrapper_XmlSecImpl());
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/xmlsec/xmlelementwrapper_xmlsecimpl.cxx b/xmlsecurity/source/xmlsec/xmlelementwrapper_xmlsecimpl.cxx
new file mode 100644
index 000000000..01f8df702
--- /dev/null
+++ b/xmlsecurity/source/xmlsec/xmlelementwrapper_xmlsecimpl.cxx
@@ -0,0 +1,78 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <string.h>
+
+#include "xmlelementwrapper_xmlsecimpl.hxx"
+#include <comphelper/servicehelper.hxx>
+#include <cppuhelper/supportsservice.hxx>
+#include <cppuhelper/typeprovider.hxx>
+
+namespace com::sun::star::uno { class XComponentContext; }
+
+using namespace com::sun::star;
+
+XMLElementWrapper_XmlSecImpl::XMLElementWrapper_XmlSecImpl(const xmlNodePtr pNode)
+    : m_pElement( pNode )
+{
+}
+
+/* XUnoTunnel */
+uno::Sequence< sal_Int8 > XMLElementWrapper_XmlSecImpl::getUnoTunnelId()
+{
+    static ::cppu::OImplementationId implId;
+
+    return implId.getImplementationId();
+}
+
+sal_Int64 SAL_CALL XMLElementWrapper_XmlSecImpl::getSomething( const uno::Sequence< sal_Int8 >& aIdentifier )
+{
+    if (isUnoTunnelId<XMLElementWrapper_XmlSecImpl>(aIdentifier))
+    {
+        return reinterpret_cast < sal_Int64 > ( this );
+    }
+
+    return 0;
+}
+
+/* XServiceInfo */
+OUString SAL_CALL XMLElementWrapper_XmlSecImpl::getImplementationName(  )
+{
+    return "com.sun.star.xml.wrapper.XMLElementWrapper";
+}
+
+sal_Bool SAL_CALL XMLElementWrapper_XmlSecImpl::supportsService( const OUString& rServiceName )
+{
+    return cppu::supportsService( this, rServiceName );
+}
+
+uno::Sequence< OUString > SAL_CALL XMLElementWrapper_XmlSecImpl::getSupportedServiceNames(  )
+{
+    uno::Sequence<OUString> aRet { "com.sun.star.xml.wrapper.XMLElementWrapper" };
+    return aRet;
+}
+
+extern "C" SAL_DLLPUBLIC_EXPORT uno::XInterface*
+com_sun_star_xml_wrapper_XMLElementWrapper_get_implementation(
+    uno::XComponentContext* /*pCtx*/, uno::Sequence<uno::Any> const& /*rSeq*/)
+{
+    return cppu::acquire(new XMLElementWrapper_XmlSecImpl(nullptr));
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/xmlsec/xmlelementwrapper_xmlsecimpl.hxx b/xmlsecurity/source/xmlsec/xmlelementwrapper_xmlsecimpl.hxx
new file mode 100644
index 000000000..d17e2f49c
--- /dev/null
+++ b/xmlsecurity/source/xmlsec/xmlelementwrapper_xmlsecimpl.hxx
@@ -0,0 +1,82 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#ifndef INCLUDED_XMLSECURITY_SOURCE_XMLSEC_XMLELEMENTWRAPPER_XMLSECIMPL_HXX
+#define INCLUDED_XMLSECURITY_SOURCE_XMLSEC_XMLELEMENTWRAPPER_XMLSECIMPL_HXX
+
+#include <com/sun/star/xml/wrapper/XXMLElementWrapper.hpp>
+#include <com/sun/star/lang/XUnoTunnel.hpp>
+#include <com/sun/star/lang/XServiceInfo.hpp>
+#include <cppuhelper/implbase.hxx>
+
+#include <libxml/tree.h>
+#include <xsecxmlsecdllapi.h>
+
+class XMLElementWrapper_XmlSecImpl : public cppu::WeakImplHelper
+<
+    css::xml::wrapper::XXMLElementWrapper,
+    css::lang::XUnoTunnel,
+    css::lang::XServiceInfo
+>
+/****** XMLElementWrapper_XmlSecImpl.hxx/CLASS XMLElementWrapper_XmlSecImpl ***
+ *
+ *   NAME
+ *  XMLElementWrapper_XmlSecImpl -- Class to wrap a libxml2 node
+ *
+ *   FUNCTION
+ *  Used as a wrapper class to transfer a libxml2 node structure
+ *  between different UNO components.
+ ******************************************************************************/
+{
+private:
+    /* the libxml2 node wrapped by this object */
+    xmlNodePtr const m_pElement;
+
+public:
+    explicit XMLElementWrapper_XmlSecImpl(const xmlNodePtr pNode);
+
+    /* XXMLElementWrapper */
+
+    /* css::lang::XUnoTunnel */
+    virtual sal_Int64 SAL_CALL getSomething( const css::uno::Sequence< sal_Int8 >& aIdentifier ) override;
+    /// @throws css::uno::RuntimeException
+    static css::uno::Sequence < sal_Int8 > getUnoTunnelId();
+
+    /* css::lang::XServiceInfo */
+    virtual OUString SAL_CALL getImplementationName(  ) override;
+    virtual sal_Bool SAL_CALL supportsService( const OUString& ServiceName ) override;
+    virtual css::uno::Sequence< OUString > SAL_CALL getSupportedServiceNames(  ) override;
+
+public:
+    /*
+    *   NAME
+    *  getNativeElement -- Retrieves the libxml2 node wrapped by this object
+    *
+    *   SYNOPSIS
+    *  pNode = getNativeElement();
+    *
+    *   RESULT
+    *  pNode - the libxml2 node wrapped by this object
+    */
+    xmlNodePtr getNativeElement( ) const { return m_pElement;}
+};
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/xmlsec/xmlsec_init.cxx b/xmlsecurity/source/xmlsec/xmlsec_init.cxx
new file mode 100644
index 000000000..7e8c58dde
--- /dev/null
+++ b/xmlsecurity/source/xmlsec/xmlsec_init.cxx
@@ -0,0 +1,69 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#include <sal/config.h>
+#include <xmlsec-wrapper.h>
+
+#include <xmlsec/xmlsec_init.hxx>
+
+#include <com/sun/star/uno/RuntimeException.hpp>
+
+#include <xmlsec/xmlstreamio.hxx>
+#ifdef XMLSEC_CRYPTO_MSCRYPTO
+#include <xmlsec/mscng/crypto.h>
+#else
+#include <xmlsec/nss/crypto.h>
+#endif
+
+using namespace css::uno;
+
+XSECXMLSEC_DLLPUBLIC void initXmlSec()
+{
+    //Init xmlsec library
+    if( xmlSecInit() < 0 ) {
+        throw RuntimeException() ;
+    }
+
+    //Init xmlsec crypto engine library
+#ifdef XMLSEC_CRYPTO_MSCRYPTO
+    if( xmlSecMSCngInit() < 0 ) {
+        xmlSecShutdown();
+        throw RuntimeException();
+    }
+#else
+    if( xmlSecNssInit() < 0 ) {
+        xmlSecShutdown();
+        throw RuntimeException();
+    }
+#endif
+
+    //Enable external stream handlers
+    if( xmlEnableStreamInputCallbacks() < 0 ) {
+#ifdef XMLSEC_CRYPTO_MSCRYPTO
+        xmlSecMSCngShutdown();
+#else
+        xmlSecNssShutdown();
+#endif
+        xmlSecShutdown() ;
+        throw RuntimeException() ;
+    }
+}
+
+XSECXMLSEC_DLLPUBLIC void deInitXmlSec()
+{
+    xmlDisableStreamInputCallbacks();
+#ifdef XMLSEC_CRYPTO_MSCRYPTO
+    xmlSecMSCngShutdown();
+#else
+    xmlSecNssShutdown();
+#endif
+    xmlSecShutdown();
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmlsecurity/source/xmlsec/xmlstreamio.cxx b/xmlsecurity/source/xmlsec/xmlstreamio.cxx
new file mode 100644
index 000000000..1000252b1
--- /dev/null
+++ b/xmlsecurity/source/xmlsec/xmlstreamio.cxx
@@ -0,0 +1,243 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <sal/config.h>
+#include <xmlsec-wrapper.h>
+
+/*
+ * Implementation of the I/O interfaces based on stream and URI binding
+ */
+#include <xmlsec/xmlstreamio.hxx>
+#include <xmlsec/errorcallback.hxx>
+#include <rtl/ustring.hxx>
+#include <rtl/uri.hxx>
+#include <comphelper/scopeguard.hxx>
+
+#include <com/sun/star/xml/crypto/XUriBinding.hpp>
+
+static bool g_bInputCallbacksEnabled = false;
+static bool g_bInputCallbacksRegistered = false;
+
+static css::uno::Reference< css::xml::crypto::XUriBinding > m_xUriBinding ;
+
+extern "C" {
+
+static int xmlStreamMatch( const char* uri )
+{
+    css::uno::Reference< css::io::XInputStream > xInputStream ;
+
+    if (g_bInputCallbacksEnabled && g_bInputCallbacksRegistered)
+    {
+        if( uri == nullptr || !m_xUriBinding.is() )
+            return 0 ;
+        //XMLSec first unescapes the uri and  calls this function. For example, we pass the Uri
+        //ObjectReplacements/Object%201 then XMLSec passes ObjectReplacements/Object 1
+        //first. If this failed it would try this
+        //again with the original escaped string. However, it does not get this far, because there
+        //is another callback registered by libxml which claims to be able to handle this uri.
+        OUString sUri =
+            ::rtl::Uri::encode( OUString::createFromAscii( uri ),
+            rtl_UriCharClassUric, rtl_UriEncodeKeepEscapes, RTL_TEXTENCODING_UTF8);
+        xInputStream = m_xUriBinding->getUriBinding( sUri ) ;
+        if (!xInputStream.is())
+        {
+            //Try the passed in uri directly.
+            //For old documents prior OOo 3.0. We did not use URIs then.
+            xInputStream = m_xUriBinding->getUriBinding(
+                OUString::createFromAscii(uri));
+        }
+    }
+    if (xInputStream.is())
+        return 1;
+    else
+        return 0 ;
+}
+
+static void* xmlStreamOpen( const char* uri )
+{
+    css::uno::Reference< css::io::XInputStream > xInputStream ;
+
+    if (g_bInputCallbacksEnabled && g_bInputCallbacksRegistered)
+    {
+        if( uri == nullptr || !m_xUriBinding.is() )
+            return nullptr ;
+
+        //see xmlStreamMatch
+        OUString sUri =
+            ::rtl::Uri::encode( OUString::createFromAscii( uri ),
+            rtl_UriCharClassUric, rtl_UriEncodeKeepEscapes, RTL_TEXTENCODING_UTF8);
+        xInputStream = m_xUriBinding->getUriBinding( sUri ) ;
+        if (!xInputStream.is())
+        {
+            //For old documents.
+            //try the passed in uri directly.
+            xInputStream = m_xUriBinding->getUriBinding(
+                OUString::createFromAscii(uri));
+        }
+
+        if( xInputStream.is() ) {
+            css::io::XInputStream* pInputStream ;
+            pInputStream = xInputStream.get() ;
+            pInputStream->acquire() ;
+            return static_cast<void*>(pInputStream) ;
+        }
+    }
+
+    return nullptr ;
+}
+
+static int xmlStreamRead( void* context, char* buffer, int len )
+{
+    int numbers ;
+    css::uno::Reference< css::io::XInputStream > xInputStream ;
+    css::uno::Sequence< sal_Int8 > outSeqs( len ) ;
+
+    numbers = 0 ;
+    if (g_bInputCallbacksEnabled && g_bInputCallbacksRegistered)
+    {
+        if( context != nullptr ) {
+            xInputStream = static_cast<css::io::XInputStream*>(context);
+            if( !xInputStream.is() )
+                return 0 ;
+
+            numbers = xInputStream->readBytes( outSeqs, len ) ;
+            const sal_Int8* readBytes = outSeqs.getArray() ;
+            for( int i = 0 ; i < numbers ; i ++ )
+                *( buffer + i ) = *( readBytes + i ) ;
+        }
+    }
+
+    return numbers ;
+}
+
+static int xmlStreamClose( void * context )
+{
+    if (g_bInputCallbacksEnabled && g_bInputCallbacksRegistered)
+    {
+        if( context != nullptr ) {
+            css::io::XInputStream* pInputStream ;
+            pInputStream = static_cast<css::io::XInputStream*>(context);
+            pInputStream->release() ;
+        }
+    }
+
+    return 0 ;
+}
+
+}
+
+int xmlEnableStreamInputCallbacks()
+{
+    if (!g_bInputCallbacksEnabled)
+    {
+        //Register the callbacks into xmlSec
+        //In order to make the xmlsec io finding the callbacks firstly,
+        //I put the callbacks at the very beginning.
+
+        //Cleanup the older callbacks.
+        //Notes: all none default callbacks will lose.
+        xmlSecIOCleanupCallbacks() ;
+
+        // Make sure that errors are reported via SAL_WARN().
+        setErrorRecorder();
+        comphelper::ScopeGuard g([] { clearErrorRecorder(); });
+
+        // Newer xmlsec wants the callback order in the opposite direction.
+        if (xmlSecCheckVersionExt(1, 2, 26, xmlSecCheckVersionABICompatible))
+        {
+            //Register the default callbacks.
+            //Notes: the error will cause xmlsec working problems.
+            int cbs = xmlSecIORegisterDefaultCallbacks() ;
+            if( cbs < 0 ) {
+                return -1 ;
+            }
+
+            //Register my classbacks.
+            cbs = xmlSecIORegisterCallbacks(
+                        xmlStreamMatch,
+                        xmlStreamOpen,
+                        xmlStreamRead,
+                        xmlStreamClose ) ;
+            if( cbs < 0 ) {
+                return -1 ;
+            }
+        }
+        else
+        {
+            //Register my classbacks.
+            int cbs = xmlSecIORegisterCallbacks(
+                        xmlStreamMatch,
+                        xmlStreamOpen,
+                        xmlStreamRead,
+                        xmlStreamClose ) ;
+            if( cbs < 0 ) {
+                return -1 ;
+            }
+
+            //Register the default callbacks.
+            //Notes: the error will cause xmlsec working problems.
+            cbs = xmlSecIORegisterDefaultCallbacks() ;
+            if( cbs < 0 ) {
+                return -1 ;
+            }
+        }
+
+        g_bInputCallbacksEnabled = true;
+    }
+
+    return 0 ;
+}
+
+int xmlRegisterStreamInputCallbacks(
+    css::uno::Reference< css::xml::crypto::XUriBinding > const & aUriBinding
+) {
+    if (!g_bInputCallbacksEnabled)
+    {
+        if( xmlEnableStreamInputCallbacks() < 0 )
+            return -1 ;
+    }
+
+    if (!g_bInputCallbacksRegistered)
+        g_bInputCallbacksRegistered = true;
+
+    m_xUriBinding = aUriBinding ;
+
+    return 0 ;
+}
+
+int xmlUnregisterStreamInputCallbacks()
+{
+    if (g_bInputCallbacksRegistered)
+    {
+        //Clear the uri-stream binding
+        m_xUriBinding.clear() ;
+
+        //disable the registered flag
+        g_bInputCallbacksRegistered = false;
+    }
+
+    return 0 ;
+}
+
+void xmlDisableStreamInputCallbacks() {
+    xmlUnregisterStreamInputCallbacks() ;
+    g_bInputCallbacksEnabled = false;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */