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diff --git a/vmime-master/src/vmime/security/digest/messageDigestFactory.hpp b/vmime-master/src/vmime/security/digest/messageDigestFactory.hpp
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+//
+// VMime library (http://www.vmime.org)
+// Copyright (C) 2002 Vincent Richard <vincent@vmime.org>
+//
+// 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 3 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.,
+// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+//
+// Linking this library statically or dynamically with other modules is making
+// a combined work based on this library.  Thus, the terms and conditions of
+// the GNU General Public License cover the whole combination.
+//
+
+#ifndef VMIME_SECURITY_DIGEST_MESSAGEDIGESTFACTORY_HPP_INCLUDED
+#define VMIME_SECURITY_DIGEST_MESSAGEDIGESTFACTORY_HPP_INCLUDED
+
+
+#include "vmime/types.hpp"
+#include "vmime/security/digest/messageDigest.hpp"
+#include "vmime/utility/stringUtils.hpp"
+
+
+namespace vmime {
+namespace security {
+namespace digest {
+
+
+/** Creates instances of message digest algorithms.
+  */
+
+class VMIME_EXPORT messageDigestFactory {
+
+private:
+
+	messageDigestFactory();
+	~messageDigestFactory();
+
+public:
+
+	static messageDigestFactory* getInstance();
+
+private:
+
+	struct digestAlgorithmFactory : public object {
+
+		virtual shared_ptr <messageDigest> create() const = 0;
+	};
+
+	template <class E>
+	struct digestAlgorithmFactoryImpl : public digestAlgorithmFactory {
+
+		shared_ptr <messageDigest> create() const {
+			return vmime::make_shared <E>();
+		}
+	};
+
+
+	typedef std::map <string, shared_ptr <digestAlgorithmFactory> > MapType;
+	MapType m_algos;
+
+public:
+
+	/** Register a new digest algorithm by its name.
+	  *
+	  * @param name algorithm name
+	  */
+	template <class E>
+	void registerAlgorithm(const string& name) {
+
+		m_algos.insert(
+			MapType::value_type(
+				utility::stringUtils::toLower(name),
+				vmime::make_shared <digestAlgorithmFactoryImpl <E> >()
+			)
+		);
+	}
+
+	/** Create a new algorithm instance from its name.
+	  *
+	  * @param name algorithm name (eg. "md5")
+	  * @return a new algorithm instance for the specified name
+	  * @throw exceptions::no_digest_algorithm_available if no algorithm is
+	  * registered with this name
+	  */
+	shared_ptr <messageDigest> create(const string& name);
+
+	/** Return a list of supported digest algorithms.
+	  *
+	  * @return list of supported digest algorithms
+	  */
+	const std::vector <string> getSupportedAlgorithms() const;
+};
+
+
+} // digest
+} // security
+} // vmime
+
+
+#endif // VMIME_SECURITY_DIGEST_MESSAGEDIGESTFACTORY_HPP_INCLUDED