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diff --git a/xmlsecurity/source/framework/encryptionengine.hxx b/xmlsecurity/source/framework/encryptionengine.hxx
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+/*************************************************************************
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * Copyright 2000, 2010 Oracle and/or its affiliates.
+ *
+ * OpenOffice.org - a multi-platform office productivity suite
+ *
+ * This file is part of OpenOffice.org.
+ *
+ * OpenOffice.org is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 3
+ * only, as published by the Free Software Foundation.
+ *
+ * OpenOffice.org is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License version 3 for more details
+ * (a copy is included in the LICENSE file that accompanied this code).
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * version 3 along with OpenOffice.org.  If not, see
+ * <http://www.openoffice.org/license.html>
+ * for a copy of the LGPLv3 License.
+ *
+ ************************************************************************/
+
+#ifndef _ENCRYPTIONENGINE_HXX
+#define _ENCRYPTIONENGINE_HXX
+
+#include <com/sun/star/xml/crypto/sax/XReferenceResolvedListener.hpp>
+#include <com/sun/star/xml/crypto/sax/XReferenceResolvedBroadcaster.hpp>
+#include <com/sun/star/xml/crypto/sax/XBlockerMonitor.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/sax/XSAXEventKeeper.hpp>
+#include <com/sun/star/xml/crypto/XXMLSecurityContext.hpp>
+#include <com/sun/star/xml/crypto/XXMLEncryption.hpp>
+#include <cppuhelper/implbase1.hxx>
+
+#include "securityengine.hxx"
+
+class EncryptionEngine : public cppu::ImplInheritanceHelper1
+<
+    SecurityEngine,
+    com::sun::star::xml::crypto::sax::XBlockerMonitor
+>
+/****** encryptionEngine.hxx/CLASS encryptionEngine ***************************
+ *
+ *   NAME
+ *  EncryptionEngine -- Base class of Encryptor and Decryptor
+ *
+ *   FUNCTION
+ *  Maintains common members and methods related with encryption.
+ *
+ *   HISTORY
+ *  05.01.2004 -    Interface supported: XBlockerMonitor
+ *
+ *   AUTHOR
+ *  Michael Mi
+ *  Email: michael.mi@sun.com
+ ******************************************************************************/
+{
+protected:
+    /*
+     * the Encryption bridge component, which performs encrypt and decrypt
+     * operation based on xmlsec library.
+     */
+    com::sun::star::uno::Reference<
+        com::sun::star::xml::crypto::XXMLEncryption > m_xXMLEncryption;
+
+    /*
+     * the Id of template blocker.
+     */
+    sal_Int32 m_nIdOfBlocker;
+
+protected:
+    EncryptionEngine( );
+    virtual ~EncryptionEngine(){};
+
+    virtual void tryToPerform( )
+        throw (com::sun::star::uno::Exception, com::sun::star::uno::RuntimeException);
+    virtual void clearUp( ) const;
+    virtual bool checkReady() const;
+
+    /*
+     * starts the main function. This method will be implemented by any sub-class.
+     * For a Encryptor, it performs encryption operation;
+     * for a Decryptor, decryption operation is performed.
+     */
+    virtual void startEngine( const com::sun::star::uno::Reference<
+        com::sun::star::xml::crypto::XXMLEncryptionTemplate >&)
+        throw (com::sun::star::uno::Exception, com::sun::star::uno::RuntimeException)
+        {};
+
+public:
+    /* XBlockerMonitor */
+    virtual void SAL_CALL setBlockerId( sal_Int32 id )
+            throw (com::sun::star::uno::Exception, com::sun::star::uno::RuntimeException);
+};
+
+#endif
+