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MD5Engine.cpp

//
// MD5Engine.cpp
//
// $Id: //poco/1.2/Foundation/src/MD5Engine.cpp#1 $
//
// Library: Foundation
// Package: Crypt
// Module:  MD5Engine
//
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
// 
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//
//
// MD5 (RFC 1321) algorithm:
// 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 for any 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 "Poco/MD5Engine.h"
#include <string.h>


namespace Poco {


MD5Engine::MD5Engine()
{
      _digest.reserve(16);
      reset();
}


MD5Engine::~MD5Engine()
{
      reset();
}

      
00080 void MD5Engine::updateImpl(const void* input_, unsigned inputLen)
{
      const unsigned char* input = (const unsigned char*) input_;
      unsigned int i, index, partLen;

      /* Compute number of bytes mod 64 */
      index = (unsigned int)((_context.count[0] >> 3) & 0x3F);

      /* Update number of bits */
      if ((_context.count[0] += ((UInt32) inputLen << 3)) < ((UInt32) inputLen << 3))
            _context.count[1]++;
      _context.count[1] += ((UInt32) inputLen >> 29);

      partLen = 64 - index;

      /* Transform as many times as possible. */
      if (inputLen >= partLen) 
      {
            memcpy(&_context.buffer[index], input, partLen);
            transform(_context.state, _context.buffer);

            for (i = partLen; i + 63 < inputLen; i += 64)
                  transform(_context.state, &input[i]);

            index = 0;
      }
      else i = 0;

      /* Buffer remaining input */
      memcpy(&_context.buffer[index], &input[i],inputLen-i);
}


00113 unsigned MD5Engine::digestLength() const
{
      return DIGEST_SIZE;
}


00119 void MD5Engine::reset()
{
      memset(&_context, 0, sizeof(_context));
      _context.count[0] = _context.count[1] = 0;
      _context.state[0] = 0x67452301;
      _context.state[1] = 0xefcdab89;
      _context.state[2] = 0x98badcfe;
      _context.state[3] = 0x10325476;
}


00130 const DigestEngine::Digest& MD5Engine::digest()
{
      static const unsigned char PADDING[64] = 
      {
            0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
      };
      unsigned char bits[8];
      unsigned int index, padLen;

      /* Save number of bits */
      encode(bits, _context.count, 8);

      /* Pad out to 56 mod 64. */
      index = (unsigned int)((_context.count[0] >> 3) & 0x3f);
      padLen = (index < 56) ? (56 - index) : (120 - index);
      update(PADDING, padLen);

      /* Append length (before padding) */
      update(bits, 8);

      /* Store state in digest */
      unsigned char digest[16];
      encode(digest, _context.state, 16);
      _digest.clear();
      _digest.insert(_digest.begin(), digest, digest + sizeof(digest));

      /* Zeroize sensitive information. */
      memset(&_context, 0, sizeof (_context));
      reset();
      return _digest;
}


/* Constants for MD5Transform routine. */
#define S11 7
#define S12 12
#define S13 17
#define S14 22
#define S21 5
#define S22 9
#define S23 14
#define S24 20
#define S31 4
#define S32 11
#define S33 16
#define S34 23
#define S41 6
#define S42 10
#define S43 15
#define S44 21


/* F, G, H and I are basic MD5 functions. */
#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
#define H(x, y, z) ((x) ^ (y) ^ (z))
#define I(x, y, z) ((y) ^ ((x) | (~z)))


/* ROTATE_LEFT rotates x left n bits. */
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))


/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
   Rotation is separate from addition to prevent recomputation. */
#define FF(a, b, c, d, x, s, ac) { \
 (a) += F ((b), (c), (d)) + (x) + (UInt32)(ac); \
 (a) = ROTATE_LEFT ((a), (s)); \
 (a) += (b); \
  }
#define GG(a, b, c, d, x, s, ac) { \
 (a) += G ((b), (c), (d)) + (x) + (UInt32)(ac); \
 (a) = ROTATE_LEFT ((a), (s)); \
 (a) += (b); \
  }
#define HH(a, b, c, d, x, s, ac) { \
 (a) += H ((b), (c), (d)) + (x) + (UInt32)(ac); \
 (a) = ROTATE_LEFT ((a), (s)); \
 (a) += (b); \
  }
#define II(a, b, c, d, x, s, ac) { \
 (a) += I ((b), (c), (d)) + (x) + (UInt32)(ac); \
 (a) = ROTATE_LEFT ((a), (s)); \
 (a) += (b); \
  }


void MD5Engine::transform (UInt32 state[4], const unsigned char block[64])
{
      UInt32 a = state[0], b = state[1], c = state[2], d = state[3], x[16];

      decode(x, block, 64);

      /* Round 1 */
      FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
      FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
      FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
      FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
      FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
      FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
      FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
      FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
      FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
      FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
      FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
      FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
      FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
      FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
      FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
      FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */

      /* Round 2 */
      GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
      GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
      GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
      GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
      GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
      GG (d, a, b, c, x[10], S22,  0x2441453); /* 22 */
      GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
      GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
      GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
      GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
      GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
      GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
      GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
      GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
      GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
      GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */

      /* Round 3 */
      HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
      HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
      HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
      HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
      HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
      HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
      HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
      HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
      HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
      HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
      HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
      HH (b, c, d, a, x[ 6], S34,  0x4881d05); /* 44 */
      HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
      HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
      HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
      HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */

      /* Round 4 */
      II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
      II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
      II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
      II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
      II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
      II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
      II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
      II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
      II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
      II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
      II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
      II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
      II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
      II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
      II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
      II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */

      state[0] += a;
      state[1] += b;
      state[2] += c;
      state[3] += d;

      /* Zeroize sensitive information. */
      memset(x, 0, sizeof(x));
}


void MD5Engine::encode(unsigned char* output, const UInt32* input, unsigned int len)
{
      unsigned int i, j;

      for (i = 0, j = 0; j < len; i++, j += 4) 
      {
            output[j]   = (unsigned char)(input[i] & 0xff);
            output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
            output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
            output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
      }
}


void MD5Engine::decode(UInt32* output, const unsigned char* input, unsigned int len)
{
      unsigned int i, j;

      for (i = 0, j = 0; j < len; i++, j += 4)
            output[i] = ((UInt32)input[j]) | (((UInt32)input[j+1]) << 8) |
                        (((UInt32)input[j+2]) << 16) | (((UInt32)input[j+3]) << 24);
}


} // namespace Poco

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