text: /**
   * Appcelerator Kroll - licensed under the Apache Public License 2
   * see LICENSE in the root folder for details on the license.
   * Copyright (c) 2009 Appcelerator, Inc. All Rights Reserved.
   */
  //
  // MD5Engine.cpp
  //
  // $Id: //poco/1.3/Foundation/src/MD5Engine.cpp#2 $
  //
  // 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 "KMD5Engine.h"
  #include <cstring>
  
  
  namespace KPoco {
  
  
  MD5Engine::MD5Engine()
  {
  	_digest.reserve(16);
  	reset();
  }
  
  
  MD5Engine::~MD5Engine()
  {
  	reset();
  }
  
  	
  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] += ((KUInt32) inputLen << 3)) < ((KUInt32) inputLen << 3))
  		_context.count[1]++;
  	_context.count[1] += ((KUInt32) inputLen >> 29);
  
  	partLen = 64 - index;
  
  	/* Transform as many times as possible. */
  	if (inputLen >= partLen) 
  	{
  		std::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 */
  	std::memcpy(&_context.buffer[index], &input[i],inputLen-i);
  }
  
  
  unsigned MD5Engine::digestLength() const
  {
  	return DIGEST_SIZE;
  }
  
  
  void MD5Engine::reset()
  {
  	std::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;
  }
  
  
  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. */
  	std::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) + (KUInt32)(ac); \
   (a) = ROTATE_LEFT ((a), (s)); \
   (a) += (b); \
    }
  #define GG(a, b, c, d, x, s, ac) { \
   (a) += G ((b), (c), (d)) + (x) + (KUInt32)(ac); \
   (a) = ROTATE_LEFT ((a), (s)); \
   (a) += (b); \
    }
  #define HH(a, b, c, d, x, s, ac) { \
   (a) += H ((b), (c), (d)) + (x) + (KUInt32)(ac); \
   (a) = ROTATE_LEFT ((a), (s)); \
   (a) += (b); \
    }
  #define II(a, b, c, d, x, s, ac) { \
   (a) += I ((b), (c), (d)) + (x) + (KUInt32)(ac); \
   (a) = ROTATE_LEFT ((a), (s)); \
   (a) += (b); \
    }
  
  
  void MD5Engine::transform (KUInt32 state[4], const unsigned char block[64])
  {
  	KUInt32 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. */
  	std::memset(x, 0, sizeof(x));
  }
  
  
  void MD5Engine::encode(unsigned char* output, const KUInt32* 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(KUInt32* output, const unsigned char* input, unsigned int len)
  {
  	unsigned int i, j;
  
  	for (i = 0, j = 0; j < len; i++, j += 4)
  		output[i] = ((KUInt32)input[j]) | (((KUInt32)input[j+1]) << 8) |
  		            (((KUInt32)input[j+2]) << 16) | (((KUInt32)input[j+3]) << 24);
  }
  
  
  } // namespace KPoco
  