265 lines
9.1 KiB
C++
Executable File
265 lines
9.1 KiB
C++
Executable File
/*****************************************************************************
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*
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* "derived from the RSA Data Security, Inc. MD5 Message-Digest Algorithm".
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*****************************************************************************/
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#include "All.h"
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#include <string.h>
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#include "MD5.h"
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#if __BYTE_ORDER == __BIG_ENDIAN
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/*
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* Block copy and convert byte order to little-endian.
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* dst must be 32bit aligned.
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* Length is the number of 32bit words
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*/
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static void
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CopyToLittleEndian ( uint32_t* dst,
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const uint8_t* src,
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size_t length )
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{
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for ( ; length--; ) {
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*dst = (( (uint32_t) src [3] ) << 24) |
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(( (uint32_t) src [2] ) << 16) |
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(( (uint32_t) src [1] ) << 8) |
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(( (uint32_t) src [0] ) << 0);
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src += 4; dst++ ;
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}
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}
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#endif
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/*
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Assembler versions of __MD5Transform, MD5Init and MD5Update
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currently exist for x86 and little-endian ARM.
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For other targets, we need to use the C versions below.
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*/
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#if !(defined (__i386__) || ((defined (__arm__) && (__BYTE_ORDER == __LITTLE_ENDIAN))))
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/*
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Initialise the MD5 context.
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*/
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void
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MD5Init ( MD5_CTX* context )
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{
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context -> count [0] = 0;
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context -> count [1] = 0;
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context -> state [0] = 0x67452301; /* Load magic constants. */
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context -> state [1] = 0xefcdab89;
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context -> state [2] = 0x98badcfe;
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context -> state [3] = 0x10325476;
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}
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#define ROTATE_LEFT(x, n) ((x << n) | (x >> (32-n)))
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#define F(x, y, z) (z ^ (x & (y ^ z)))
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#define G(x, y, z) (y ^ (z & (x ^ y)))
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#define H(x, y, z) (x ^ y ^ z)
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#define I(x, y, z) (y ^ (x | ~z))
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#define FF(a, b, c, d, x, s, ac) { (a) += F (b, c, d) + (x) + (uint32_t)(ac); (a) = ROTATE_LEFT (a, s); (a) += (b); }
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#define GG(a, b, c, d, x, s, ac) { (a) += G (b, c, d) + (x) + (uint32_t)(ac); (a) = ROTATE_LEFT (a, s); (a) += (b); }
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#define HH(a, b, c, d, x, s, ac) { (a) += H (b, c, d) + (x) + (uint32_t)(ac); (a) = ROTATE_LEFT (a, s); (a) += (b); }
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#define II(a, b, c, d, x, s, ac) { (a) += I (b, c, d) + (x) + (uint32_t)(ac); (a) = ROTATE_LEFT (a, s); (a) += (b); }
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static void
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__MD5Transform ( uint32_t state [4],
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const uint8_t* in,
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int repeat )
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{
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const uint32_t* x;
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uint32_t a = state [0];
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uint32_t b = state [1];
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uint32_t c = state [2];
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uint32_t d = state [3];
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for ( ; repeat; repeat-- ) {
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uint32_t tempBuffer [16];
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#if __BYTE_ORDER == __BIG_ENDIAN
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CopyToLittleEndian (tempBuffer, in, 16);
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x = tempBuffer;
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#else
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if ( (unsigned int)in & 3 ) {
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memcpy ( tempBuffer, in, 64 );
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x = tempBuffer;
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}
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else {
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x = (const uint32_t*) in;
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}
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#endif
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FF (a, b, c, d, x[ 0], 7, 0xd76aa478); /* 1 */ /* Round 1 */
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FF (d, a, b, c, x[ 1], 12, 0xe8c7b756); /* 2 */
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FF (c, d, a, b, x[ 2], 17, 0x242070db); /* 3 */
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FF (b, c, d, a, x[ 3], 22, 0xc1bdceee); /* 4 */
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FF (a, b, c, d, x[ 4], 7, 0xf57c0faf); /* 5 */
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FF (d, a, b, c, x[ 5], 12, 0x4787c62a); /* 6 */
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FF (c, d, a, b, x[ 6], 17, 0xa8304613); /* 7 */
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FF (b, c, d, a, x[ 7], 22, 0xfd469501); /* 8 */
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FF (a, b, c, d, x[ 8], 7, 0x698098d8); /* 9 */
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FF (d, a, b, c, x[ 9], 12, 0x8b44f7af); /* 10 */
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FF (c, d, a, b, x[10], 17, 0xffff5bb1); /* 11 */
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FF (b, c, d, a, x[11], 22, 0x895cd7be); /* 12 */
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FF (a, b, c, d, x[12], 7, 0x6b901122); /* 13 */
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FF (d, a, b, c, x[13], 12, 0xfd987193); /* 14 */
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FF (c, d, a, b, x[14], 17, 0xa679438e); /* 15 */
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FF (b, c, d, a, x[15], 22, 0x49b40821); /* 16 */
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GG (a, b, c, d, x[ 1], 5, 0xf61e2562); /* 17 */ /* Round 2 */
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GG (d, a, b, c, x[ 6], 9, 0xc040b340); /* 18 */
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GG (c, d, a, b, x[11], 14, 0x265e5a51); /* 19 */
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GG (b, c, d, a, x[ 0], 20, 0xe9b6c7aa); /* 20 */
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GG (a, b, c, d, x[ 5], 5, 0xd62f105d); /* 21 */
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GG (d, a, b, c, x[10], 9, 0x02441453); /* 22 */
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GG (c, d, a, b, x[15], 14, 0xd8a1e681); /* 23 */
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GG (b, c, d, a, x[ 4], 20, 0xe7d3fbc8); /* 24 */
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GG (a, b, c, d, x[ 9], 5, 0x21e1cde6); /* 25 */
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GG (d, a, b, c, x[14], 9, 0xc33707d6); /* 26 */
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GG (c, d, a, b, x[ 3], 14, 0xf4d50d87); /* 27 */
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GG (b, c, d, a, x[ 8], 20, 0x455a14ed); /* 28 */
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GG (a, b, c, d, x[13], 5, 0xa9e3e905); /* 29 */
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GG (d, a, b, c, x[ 2], 9, 0xfcefa3f8); /* 30 */
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GG (c, d, a, b, x[ 7], 14, 0x676f02d9); /* 31 */
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GG (b, c, d, a, x[12], 20, 0x8d2a4c8a); /* 32 */
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HH (a, b, c, d, x[ 5], 4, 0xfffa3942); /* 33 */ /* Round 3 */
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HH (d, a, b, c, x[ 8], 11, 0x8771f681); /* 34 */
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HH (c, d, a, b, x[11], 16, 0x6d9d6122); /* 35 */
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HH (b, c, d, a, x[14], 23, 0xfde5380c); /* 36 */
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HH (a, b, c, d, x[ 1], 4, 0xa4beea44); /* 37 */
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HH (d, a, b, c, x[ 4], 11, 0x4bdecfa9); /* 38 */
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HH (c, d, a, b, x[ 7], 16, 0xf6bb4b60); /* 39 */
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HH (b, c, d, a, x[10], 23, 0xbebfbc70); /* 40 */
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HH (a, b, c, d, x[13], 4, 0x289b7ec6); /* 41 */
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HH (d, a, b, c, x[ 0], 11, 0xeaa127fa); /* 42 */
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HH (c, d, a, b, x[ 3], 16, 0xd4ef3085); /* 43 */
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HH (b, c, d, a, x[ 6], 23, 0x04881d05); /* 44 */
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HH (a, b, c, d, x[ 9], 4, 0xd9d4d039); /* 45 */
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HH (d, a, b, c, x[12], 11, 0xe6db99e5); /* 46 */
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HH (c, d, a, b, x[15], 16, 0x1fa27cf8); /* 47 */
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HH (b, c, d, a, x[ 2], 23, 0xc4ac5665); /* 48 */
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II (a, b, c, d, x[ 0], 6, 0xf4292244); /* 49 */ /* Round 4 */
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II (d, a, b, c, x[ 7], 10, 0x432aff97); /* 50 */
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II (c, d, a, b, x[14], 15, 0xab9423a7); /* 51 */
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II (b, c, d, a, x[ 5], 21, 0xfc93a039); /* 52 */
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II (a, b, c, d, x[12], 6, 0x655b59c3); /* 53 */
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II (d, a, b, c, x[ 3], 10, 0x8f0ccc92); /* 54 */
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II (c, d, a, b, x[10], 15, 0xffeff47d); /* 55 */
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II (b, c, d, a, x[ 1], 21, 0x85845dd1); /* 56 */
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II (a, b, c, d, x[ 8], 6, 0x6fa87e4f); /* 57 */
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II (d, a, b, c, x[15], 10, 0xfe2ce6e0); /* 58 */
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II (c, d, a, b, x[ 6], 15, 0xa3014314); /* 59 */
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II (b, c, d, a, x[13], 21, 0x4e0811a1); /* 60 */
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II (a, b, c, d, x[ 4], 6, 0xf7537e82); /* 61 */
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II (d, a, b, c, x[11], 10, 0xbd3af235); /* 62 */
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II (c, d, a, b, x[ 2], 15, 0x2ad7d2bb); /* 63 */
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II (b, c, d, a, x[ 9], 21, 0xeb86d391); /* 64 */
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state [0] = a = a + state [0];
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state [1] = b = b + state [1];
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state [2] = c = c + state [2];
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state [3] = d = d + state [3];
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in += 64;
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}
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}
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/*
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MD5 block update operation:
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Process another sub-string of the message and update the context.
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*/
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void
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MD5Update ( MD5_CTX* context,
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const uint8_t* input,
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size_t inputBytes )
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{
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int byteIndex;
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unsigned int partLen;
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int len;
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int i;
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/* Compute number of bytes mod 64 */
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byteIndex = (context -> count[0] >> 3) & 0x3F;
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/* Update number of bits: count += 8 * inputBytes */
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if ( (context -> count [0] += inputBytes << 3) < (inputBytes << 3) )
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context -> count [1]++;
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context -> count [1] += inputBytes >> (32 - 3);
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partLen = (64 - byteIndex);
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/* Transform as many times as possible. */
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if ( inputBytes >= partLen ) {
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memcpy ( context -> buffer + byteIndex, input, partLen );
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__MD5Transform ( context -> state, (const uint8_t*) context -> buffer, 1 );
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len = ( inputBytes - partLen ) >> 6;
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__MD5Transform ( context -> state, input + partLen, len );
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i = partLen + (len << 6);
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byteIndex = 0;
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}
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else {
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i = 0;
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}
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/* Buffer remaining input */
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memcpy ( (context -> buffer) + byteIndex, input + i, inputBytes - i );
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}
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#endif
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void
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MD5Final ( uint8_t digest [16],
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MD5_CTX* context )
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{
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static uint8_t finalBlock [64];
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uint32_t bits [2];
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int byteIndex;
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int finalBlockLength;
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byteIndex = (context -> count[0] >> 3) & 0x3F;
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finalBlockLength = (byteIndex < 56 ? 56 : 120) - byteIndex;
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finalBlock[0] = 0x80;
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#if __BYTE_ORDER == __BIG_ENDIAN
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CopyToLittleEndian ( bits, (const uint8_t*) context -> count, 2 );
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#else
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memcpy ( bits, context->count, 8 );
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#endif
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MD5Update ( context, finalBlock, finalBlockLength );
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MD5Update ( context, (const uint8_t*) bits, 8 );
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#if __BYTE_ORDER == __BIG_ENDIAN
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CopyToLittleEndian ( (uint32_t*) digest, (const uint8_t*) context -> state, 4 );
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#else
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memcpy ( digest, context -> state, 16 );
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#endif
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memset ( context, 0, sizeof (*context) );
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}
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