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diff --git a/package/source/zipapi/blowfishcontext.hxx b/package/source/zipapi/blowfishcontext.hxx
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+++ b/package/source/zipapi/blowfishcontext.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_PACKAGE_SOURCE_ZIPAPI_BLOWFISHCONTEXT_HXX
+#define INCLUDED_PACKAGE_SOURCE_ZIPAPI_BLOWFISHCONTEXT_HXX
+
+#include <com/sun/star/xml/crypto/XCipherContext.hpp>
+
+#include <cppuhelper/implbase.hxx>
+#include <mutex>
+
+class BlowfishCFB8CipherContext : public cppu::WeakImplHelper< css::xml::crypto::XCipherContext >
+{
+    std::mutex m_aMutex;
+    void* m_pCipher;
+    bool m_bEncrypt;
+
+    BlowfishCFB8CipherContext()
+    : m_pCipher( nullptr )
+    , m_bEncrypt( false )
+    {}
+
+public:
+
+    virtual ~BlowfishCFB8CipherContext() override;
+
+    static css::uno::Reference< css::xml::crypto::XCipherContext >
+        Create( const css::uno::Sequence< sal_Int8 >& aDerivedKey, const css::uno::Sequence< sal_Int8 >& aInitVector, bool bEncrypt );
+
+    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 // INCLUDED_PACKAGE_SOURCE_ZIPAPI_BLOWFISHCONTEXT_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */