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diff --git a/vmime-master/src/vmime/security/digest/messageDigest.hpp b/vmime-master/src/vmime/security/digest/messageDigest.hpp
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+++ b/vmime-master/src/vmime/security/digest/messageDigest.hpp
@@ -0,0 +1,142 @@
+//
+// 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_MESSAGEDIGEST_HPP_INCLUDED
+#define VMIME_SECURITY_DIGEST_MESSAGEDIGEST_HPP_INCLUDED
+
+
+#include "vmime/object.hpp"
+#include "vmime/types.hpp"
+
+
+namespace vmime {
+namespace security {
+namespace digest {
+
+
+/** Computes message digests using standard algorithms,
+  * such as MD5 or SHA.
+  */
+class VMIME_EXPORT messageDigest : public object {
+
+public:
+
+	/** Updates the digest using the specified string.
+	  *
+	  * @param s the string with which to update the digest.
+	  */
+	virtual void update(const string& s) = 0;
+
+	/** Updates the digest using the specified byte.
+	  *
+	  * @param b the byte with which to update the digest.
+	  */
+	virtual void update(const byte_t b) = 0;
+
+	/** Updates the digest using the specified array of bytes.
+	  *
+	  * @param buffer array of bytes
+	  * @param len number of bytes to use in the buffer
+	  */
+	virtual void update(const byte_t* buffer, const size_t len) = 0;
+
+	/** Updates the digest using the specified array of bytes,
+	  * starting at the specified offset.
+	  *
+	  * @param buffer array of bytes
+	  * @param offset offset to start from in the array of bytes
+	  * @param len number of bytes to use, starting at offset
+	  */
+	virtual void update(
+		const byte_t* buffer,
+		const size_t offset,
+		const size_t len
+	) = 0;
+
+	/** Completes the hash computation by performing final operations
+	  * such as padding.
+	  */
+	virtual void finalize() = 0;
+
+	/** Completes the hash computation by performing final operations
+	  * such as padding. This is equivalent to calling update() and
+	  * then finalize().
+	  */
+	virtual void finalize(const string& s) = 0;
+
+	/** Completes the hash computation by performing final operations
+	  * such as padding. This is equivalent to calling update() and
+	  * then finalize().
+	  */
+	virtual void finalize(
+		const byte_t* buffer,
+		const size_t len
+	) = 0;
+
+	/** Completes the hash computation by performing final operations
+	  * such as padding. This is equivalent to calling update() and
+	  * then finalize().
+	  */
+	virtual void finalize(
+		const byte_t* buffer,
+		const size_t offset,
+		const size_t len
+	) = 0;
+
+	/** Returns the length of the hash.
+	  * This is the length of the array returned by getDigest().
+	  *
+	  * @return length of computed hash
+	  */
+	virtual size_t getDigestLength() const = 0;
+
+	/** Returns the hash, as computed by the algorithm.
+	  * You must call finalize() before using this function, or the
+	  * hash will not be correct.
+	  * To get the size of the returned array, call getDigestLength().
+	  *
+	  * @return computed hash
+	  */
+	virtual const byte_t* getDigest() const = 0;
+
+	/** Returns the hash as an hexadecimal string.
+	  * You must call finalize() before using this function, or the
+	  * hash will not be correct.
+	  *
+	  * @return computed hash, in hexadecimal format
+	  */
+	virtual const string getHexDigest() const;
+
+	/** Resets the algorithm to its initial state, so that you can
+	  * compute a new hash using the same object.
+	  */
+	virtual void reset() = 0;
+};
+
+
+} // digest
+} // security
+} // vmime
+
+
+#endif // VMIME_SECURITY_DIGEST_MESSAGEDIGEST_HPP_INCLUDED