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diff --git a/xmlsecurity/inc/framework/signatureengine.hxx b/xmlsecurity/inc/framework/signatureengine.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 .
+ */
+
+#ifndef INCLUDED_XMLSECURITY_INC_FRAMEWORK_SIGNATUREENGINE_HXX
+#define INCLUDED_XMLSECURITY_INC_FRAMEWORK_SIGNATUREENGINE_HXX
+
+#include <com/sun/star/xml/crypto/sax/XReferenceResolvedListener.hpp>
+#include <com/sun/star/xml/crypto/sax/XReferenceCollector.hpp>
+#include <com/sun/star/xml/crypto/sax/XKeyCollector.hpp>
+#include <com/sun/star/xml/crypto/sax/XMissionTaker.hpp>
+#include <com/sun/star/xml/crypto/XUriBinding.hpp>
+
+#include <cppuhelper/implbase.hxx>
+
+#include <xmlsecuritydllapi.h>
+#include <framework/securityengine.hxx>
+
+#include <vector>
+
+namespace com::sun::star::io { class XInputStream; }
+namespace com::sun::star::xml::crypto { class XXMLSignature; }
+namespace rtl { template <class reference_type> class Reference; }
+
+class XMLSignatureTemplateImpl;
+
+class SignatureEngine : public cppu::ImplInheritanceHelper
+<
+    SecurityEngine,
+    css::xml::crypto::sax::XReferenceCollector,
+    css::xml::crypto::XUriBinding
+>
+/****** signatureengine.hxx/CLASS SignatureEngine *****************************
+ *
+ *   NAME
+ *  SignatureEngine -- Base class of SignatureCreator and SignatureVerifier
+ *
+ *   FUNCTION
+ *  Maintains common members and methods related with signature operation.
+ ******************************************************************************/
+{
+protected:
+
+    /*
+     * the Signature bridge component, which performs signature generation
+     * and verification based on xmlsec library.
+     */
+    css::uno::Reference< css::xml::crypto::XXMLSignature > m_xXMLSignature;
+
+    /*
+     * a collection of ElementCollector's ids. Each ElementCollector
+     * represents one element signed by this signature.
+     */
+    std::vector< sal_Int32 > m_vReferenceIds;
+
+    /*
+     * remembers how many references this signature has.
+     */
+    sal_Int32 m_nTotalReferenceNumber;
+
+    /*
+     * a collection of Uri binding.
+     *
+     * the m_vUris is used to hold the Uri strings, and the m_vXInputStreams is used
+     * to hold corresponding bound XInputStream interface.
+     */
+    std::vector< OUString > m_vUris;
+    std::vector< css::uno::Reference< css::io::XInputStream > > m_vXInputStreams;
+
+protected:
+    explicit SignatureEngine();
+    virtual ~SignatureEngine() override {};
+
+    virtual void tryToPerform( ) override;
+    virtual void clearUp( ) const override;
+    bool checkReady() const;
+
+    /*
+     * starts the main function. This method will be implemented by any sub-class.
+     * For a SignatureCreator, it performs signing operation;
+     * for a SignatureVerifier, verification operation is performed.
+     */
+    /// @throws css::uno::Exception
+    /// @throws css::uno::RuntimeException
+    virtual void startEngine( const rtl::Reference<XMLSignatureTemplateImpl>&)
+        {};
+
+public:
+    /* XReferenceCollector */
+    virtual void SAL_CALL setReferenceCount( sal_Int32 count ) override;
+
+    virtual void SAL_CALL setReferenceId( sal_Int32 id ) override;
+
+    /* XUriBinding */
+    virtual void SAL_CALL setUriBinding(
+        const OUString& uri,
+        const css::uno::Reference< css::io::XInputStream >& aInputStream ) override;
+    virtual css::uno::Reference< css::io::XInputStream >
+        SAL_CALL getUriBinding( const OUString& uri ) override;
+};
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */