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diff --git a/src/utility/md5.cpp b/src/utility/md5.cpp
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+//
+// 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.
+//
+//
+// Derived from cryptoapi implementation, originally based on the
+// public domain implementation written by Colin Plumb in 1993.
+//
+// Copyright (C) Cryptoapi developers.
+//
+// Algorithm Copyright:
+//
+//     Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
+//     rights reserved.
+//
+//     License to copy and use this software is granted provided that it
+//     is identified as the "RSA Data Security, Inc. MD5 Message-Digest
+//     Algorithm" in all material mentioning or referencing this software
+//     or this function.
+//
+//     License is also granted to make and use derivative works provided
+//     that such works are identified as "derived from the RSA Data
+//     Security, Inc. MD5 Message-Digest Algorithm" in all material
+//     mentioning or referencing the derived work.
+//
+//     RSA Data Security, Inc. makes no representations concerning either
+//     the merchantability of this software or the suitability of this
+//     software forany particular purpose. It is provided "as is"
+//     without express or implied warranty of any kind.
+//     These notices must be retained in any copies of any part of this
+//     documentation and/or software.
+
+#include "md5.hpp"
+
+
+namespace vmime {
+namespace utility {
+
+
+md5::md5()
+	: m_finalized(false)
+{
+	init();
+}
+
+
+md5::md5(const vmime_uint8* const in, const unsigned long length)
+	: m_finalized(false)
+{
+	init();
+	update(in, length);
+}
+
+
+md5::md5(const string& in)
+	: m_finalized(false)
+{
+	init();
+	update((vmime_uint8*) in.c_str(), in.length());
+}
+
+
+void md5::init()
+{
+	m_hash[0] = 0x67452301;
+	m_hash[1] = 0xefcdab89;
+	m_hash[2] = 0x98badcfe;
+	m_hash[3] = 0x10325476;
+
+	m_byteCount = 0;
+}
+
+
+static void copyUint8Array(vmime_uint8* dest, const vmime_uint8* src, unsigned long count)
+{
+	for ( ; count >= 4 ; count -= 4, dest += 4, src += 4)
+	{
+		dest[0] = src[0];
+		dest[1] = src[1];
+		dest[2] = src[2];
+		dest[3] = src[3];
+	}
+
+	for ( ; count ; --count, ++dest, ++src)
+		dest[0] = src[0];
+}
+
+
+void md5::update(const string& in)
+{
+	update((vmime_uint8*) in.c_str(), in.length());
+}
+
+
+void md5::update(const vmime_uint8* data, unsigned long len)
+{
+	if (m_finalized)
+		return;
+
+	const unsigned long avail = 64 - (m_byteCount & 0x3f);
+
+	m_byteCount += len;
+
+	if (avail > len)
+	{
+		copyUint8Array(m_block + (64 - avail), data, len);
+		return;
+	}
+
+	copyUint8Array(m_block + (64 - avail), data, avail);
+	transformHelper();
+
+	data += avail;
+	len -= avail;
+
+	while (len >= 64)
+	{
+		copyUint8Array(m_block, data, 64);
+		transformHelper();
+
+		data += 64;
+		len -= 64;
+	}
+
+	copyUint8Array(m_block, data, len);
+}
+
+
+void md5::finalize()
+{
+	const long offset = m_byteCount & 0x3f;
+
+	vmime_uint8* p = m_block + offset;
+	long padding = 56 - (offset + 1);
+
+	*p++ = 0x80;
+
+	if (padding < 0)
+	{
+		memset(p, 0x00, padding + 8);
+		transformHelper();
+		p = m_block;
+		padding = 56;
+	}
+
+	memset(p, 0, padding);
+
+	((vmime_uint32*) m_block)[14] = (m_byteCount << 3);
+	((vmime_uint32*) m_block)[15] = (m_byteCount >> 29);
+
+#if VMIME_BYTE_ORDER_BIG_ENDIAN
+	swapUint32Array((vmime_uint32*) m_block, (64 - 8) / 4);
+#endif
+
+	transform();
+
+#if VMIME_BYTE_ORDER_BIG_ENDIAN
+	swapUint32Array((vmime_uint32*) m_hash, 4);
+#endif
+
+	m_finalized = true;
+}
+
+
+static inline vmime_uint32 swapUint32(const vmime_uint32 D)
+{
+	return ((D << 24) | ((D << 8) & 0x00FF0000) | ((D >> 8) & 0x0000FF00) | (D >> 24));
+}
+
+
+static inline void swapUint32Array(vmime_uint32* buf, unsigned long words)
+{
+	for ( ; words >= 4 ; words -= 4, buf += 4)
+	{
+		buf[0] = swapUint32(buf[0]);
+		buf[1] = swapUint32(buf[1]);
+		buf[2] = swapUint32(buf[2]);
+		buf[3] = swapUint32(buf[3]);
+	}
+
+	for ( ; words ; --words, ++buf)
+		buf[0] = swapUint32(buf[0]);
+}
+
+
+void md5::transformHelper()
+{
+#if VMIME_BYTE_ORDER_BIG_ENDIAN
+	swapUint32Array((vmime_uint32*) m_block, 64 / 4);
+#endif
+	transform();
+}
+
+
+void md5::transform()
+{
+	const vmime_uint32* const in = (vmime_uint32*) m_block;
+
+	vmime_uint32 a = m_hash[0];
+	vmime_uint32 b = m_hash[1];
+	vmime_uint32 c = m_hash[2];
+	vmime_uint32 d = m_hash[3];
+
+#define F1(x, y, z)	(z ^ (x & (y ^ z)))
+#define F2(x, y, z)	F1(z, x, y)
+#define F3(x, y, z)	(x ^ y ^ z)
+#define F4(x, y, z)	(y ^ (x | ~z))
+
+#define MD5STEP(f, w, x, y, z, in, s) \
+	(w += f(x, y, z) + in, w = (w<<s | w>>(32-s)) + x)
+
+	MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
+	MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
+	MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
+	MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
+	MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
+	MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
+	MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
+	MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
+	MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
+	MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
+	MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
+	MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
+	MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
+	MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
+	MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
+	MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
+
+	MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
+	MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
+	MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
+	MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
+	MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
+	MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
+	MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
+	MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
+	MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
+	MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
+	MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
+	MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
+	MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
+	MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
+	MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
+	MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
+
+	MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
+	MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
+	MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
+	MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
+	MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
+	MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
+	MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
+	MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
+	MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
+	MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
+	MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
+	MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
+	MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
+	MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
+	MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
+	MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
+
+	MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
+	MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
+	MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
+	MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
+	MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
+	MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
+	MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
+	MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
+	MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
+	MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
+	MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
+	MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
+	MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
+	MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
+	MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
+	MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
+
+	m_hash[0] += a;
+	m_hash[1] += b;
+	m_hash[2] += c;
+	m_hash[3] += d;
+}
+
+
+const string md5::hex()
+{
+	if (!m_finalized)
+		finalize();
+
+	static const unsigned char hex[] = "0123456789abcdef";
+
+	std::ostringstream oss;
+	const vmime_uint8* const digest = (vmime_uint8*) m_hash;
+
+	for (int i = 0 ; i < 16 ; ++i)
+	{
+		oss << hex[(digest[i] & 0xf0) >> 4];
+		oss << hex[(digest[i] & 0x0f)];
+	}
+
+	return (oss.str());
+}
+
+
+const vmime_uint8* md5::hash()
+{
+	if (!m_finalized)
+		finalize();
+
+	return ((vmime_uint8*) m_hash);
+}
+
+
+} // utility
+} // vmime