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diff --git a/src/utility/md5.hpp b/src/utility/md5.hpp
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+++ b/src/utility/md5.hpp
@@ -0,0 +1,68 @@
+//
+// VMime library (http://vmime.sourceforge.net)
+// Copyright (C) 2002-2004 Vincent Richard <[email protected]>
+//
+// This program is free software; you can redistribute it and/or
+// modify it under the terms of the GNU General Public License as
+// published by the Free Software Foundation; either version 2 of
+// the License, or (at your option) any later version.
+//
+// This program 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
+// General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+//
+
+#ifndef VMIME_UTILITY_MD5_HPP_INCLUDED
+#define VMIME_UTILITY_MD5_HPP_INCLUDED
+
+
+#include "base.hpp"
+#include "config.hpp"
+
+
+namespace vmime {
+namespace utility {
+
+
+class md5
+{
+public:
+
+	md5();
+	md5(const vmime_uint8* const in, const unsigned long length);
+	md5(const string& in);
+
+public:
+
+	const string hex();
+	const vmime_uint8* hash();
+
+	void update(const vmime_uint8* data, unsigned long len);
+	void update(const string& in);
+
+protected:
+
+	void init();
+	void transformHelper();
+	void transform();
+	void finalize();
+
+	vmime_uint32 m_hash[4];
+
+	unsigned long m_byteCount;
+	vmime_uint8 m_block[64];
+
+	bool m_finalized;
+};
+
+
+} // utility
+} // vmime
+
+
+#endif // VMIME_UTILITY_MD5_HPP_INCLUDED