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diff --git a/xmlsecurity/inc/documentsignaturemanager.hxx b/xmlsecurity/inc/documentsignaturemanager.hxx
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+/* -*- 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 .
+ */
+
+#pragma once
+
+#include "xmlsecuritydllapi.h"
+
+#include <memory>
+
+#include <svl/sigstruct.hxx>
+#include "xmlsignaturehelper.hxx"
+#include "documentsignaturehelper.hxx"
+
+#include <com/sun/star/xml/crypto/XSEInitializer.hpp>
+
+namespace com::sun::star
+{
+namespace beans
+{
+struct PropertyValue;
+}
+namespace embed
+{
+class XStorage;
+}
+namespace frame
+{
+class XModel;
+}
+namespace graphic
+{
+class XGraphic;
+}
+namespace uno
+{
+class XComponentContext;
+}
+}
+class PDFSignatureHelper;
+
+/// Manages signatures (addition, removal), used by DigitalSignaturesDialog.
+class XMLSECURITY_DLLPUBLIC DocumentSignatureManager
+{
+private:
+    css::uno::Reference<css::uno::XComponentContext> mxContext;
+    css::uno::Reference<css::embed::XStorage> mxStore;
+    XMLSignatureHelper maSignatureHelper;
+    std::unique_ptr<PDFSignatureHelper> mpPDFSignatureHelper;
+    SignatureInformations maCurrentSignatureInformations;
+    DocumentSignatureMode const meSignatureMode;
+    css::uno::Sequence<css::uno::Sequence<css::beans::PropertyValue>> m_manifest;
+    css::uno::Reference<css::io::XStream> mxSignatureStream;
+    css::uno::Reference<css::frame::XModel> mxModel;
+    css::uno::Reference<css::io::XStream> mxTempSignatureStream;
+    /// Storage containing all OOXML signatures, unused for ODF.
+    css::uno::Reference<css::embed::XStorage> mxTempSignatureStorage;
+    css::uno::Reference<css::xml::crypto::XSEInitializer> mxSEInitializer;
+    css::uno::Reference<css::xml::crypto::XXMLSecurityContext> mxSecurityContext;
+    css::uno::Reference<css::xml::crypto::XSEInitializer> mxGpgSEInitializer;
+    css::uno::Reference<css::xml::crypto::XXMLSecurityContext> mxGpgSecurityContext;
+
+public:
+    DocumentSignatureManager(const css::uno::Reference<css::uno::XComponentContext>& xContext,
+                             DocumentSignatureMode eMode);
+    ~DocumentSignatureManager();
+
+    /**
+     * Checks if a particular stream is a valid xml stream. Those are treated
+     * differently when they are signed (c14n transformation)
+     */
+    bool isXML(std::u16string_view rURI);
+    bool readManifest();
+
+    SignatureStreamHelper ImplOpenSignatureStream(sal_Int32 nStreamOpenMode, bool bTempStream);
+    /// Add a new signature, using xCert as a signing certificate, and rDescription as description.
+    bool add(const css::uno::Reference<css::security::XCertificate>& xCert,
+             const css::uno::Reference<css::xml::crypto::XXMLSecurityContext>& xSecurityContext,
+             const OUString& rDescription, sal_Int32& nSecurityId, bool bAdESCompliant,
+             const OUString& rSignatureLineId = OUString(),
+             const css::uno::Reference<css::graphic::XGraphic>& xValidGraphic
+             = css::uno::Reference<css::graphic::XGraphic>(),
+             const css::uno::Reference<css::graphic::XGraphic>& xInvalidGraphic
+             = css::uno::Reference<css::graphic::XGraphic>());
+    /// Remove signature at nPosition.
+    void remove(sal_uInt16 nPosition);
+    /// Read signatures from either a temp stream or the real storage.
+    void read(bool bUseTempStream, bool bCacheLastSignature = true);
+    /// Write signatures back to the persistent storage.
+    void write(bool bXAdESCompliantIfODF);
+    /// Lazy creation of PDF helper.
+    PDFSignatureHelper& getPDFSignatureHelper();
+#if 0
+    // Checks if the document is a kind where it is relevant to distinguish between using XAdES or not
+    bool IsXAdESRelevant();
+#endif
+    /// Attempts to initialize the platform-specific crypto.
+    bool init();
+    /// Get the security environment.
+    css::uno::Reference<css::xml::crypto::XSecurityEnvironment> getSecurityEnvironment();
+    css::uno::Reference<css::xml::crypto::XSecurityEnvironment> getGpgSecurityEnvironment();
+    css::uno::Reference<css::xml::crypto::XXMLSecurityContext> const& getSecurityContext() const;
+    css::uno::Reference<css::xml::crypto::XXMLSecurityContext> const& getGpgSecurityContext() const;
+    void setStore(const css::uno::Reference<css::embed::XStorage>& xStore) { mxStore = xStore; }
+    XMLSignatureHelper& getSignatureHelper() { return maSignatureHelper; }
+    bool hasPDFSignatureHelper() const { return bool(mpPDFSignatureHelper); }
+    void setSignatureStream(const css::uno::Reference<css::io::XStream>& xSignatureStream)
+    {
+        mxSignatureStream = xSignatureStream;
+    }
+    void setModel(const css::uno::Reference<css::frame::XModel>& xModel);
+    const css::uno::Reference<css::embed::XStorage>& getStore() const { return mxStore; }
+    DocumentSignatureMode getSignatureMode() const { return meSignatureMode; }
+    SignatureInformations& getCurrentSignatureInformations()
+    {
+        return maCurrentSignatureInformations;
+    }
+};
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */