release/src/router/nettle/md5-compress.c

   1 /* md5-compress.c
   2  *
   3  * The compression function for the sha1 hash function.
   4  *
   5  */
   6
   7 /* nettle, low-level cryptographics library
   8  *
   9  * Copyright (C) 2001, 2005 Niels Möller
  10  *
  11  * The nettle library is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU Lesser General Public License as published by
  13  * the Free Software Foundation; either version 2.1 of the License, or (at your
  14  * option) any later version.
  15  *
  16  * The nettle library is distributed in the hope that it will be useful, but
  17  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  18  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
  19  * License for more details.
  20  *
  21  * You should have received a copy of the GNU Lesser General Public License
  22  * along with the nettle library; see the file COPYING.LIB.  If not, write to
  23  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  24  * MA 02111-1301, USA.
  25  */
  26
  27 /* Based on public domain code hacked by Colin Plumb, Andrew Kuchling, and
  28  * Niels Möller. */
  29
  30
  31 #if HAVE_CONFIG_H
  32 # include "config.h"
  33 #endif
  34
  35 #ifndef MD5_DEBUG
  36 # define MD5_DEBUG 0
  37 #endif
  38
  39 #if MD5_DEBUG
  40 # include <stdio.h>
  41 # define DEBUG(i) \
  42   fprintf(stderr, "%2d: %8x %8x %8x %8x\n", i, a, b, c, d)
  43 #else
  44 # define DEBUG(i)
  45 #endif
  46
  47 #include <assert.h>
  48 #include <stdlib.h>
  49 #include <string.h>
  50
  51 #include "md5.h"
  52
  53 #include "macros.h"
  54
  55 /* A block, treated as a sequence of 32-bit words. */
  56 #define MD5_DATA_LENGTH 16
  57
  58 /* MD5 functions */
  59
  60 #define F1(x, y, z) ((z) ^ ((x) & ((y) ^ (z))))
  61 #define F2(x, y, z) F1((z), (x), (y))
  62 #define F3(x, y, z) ((x) ^ (y) ^ (z))
  63 #define F4(x, y, z) ((y) ^ ((x) | ~(z)))
  64
  65 #define ROUND(f, w, x, y, z, data, s) \
  66 ( w += f(x, y, z) + data,  w = w<<s | w>>(32-s),  w += x )
  67
  68 /* Perform the MD5 transformation on one full block of 16 32-bit
  69  * words.
  70  *
  71  * Compresses 20 (_MD5_DIGEST_LENGTH + MD5_DATA_LENGTH) words into 4
  72  * (_MD5_DIGEST_LENGTH) words. */
  73
  74 void
  75 _nettle_md5_compress(uint32_t *digest, const uint8_t *input)
  76 {
  77   uint32_t data[MD5_DATA_LENGTH];
  78   uint32_t a, b, c, d;
  79   unsigned i;
  80
  81   for (i = 0; i < MD5_DATA_LENGTH; i++, input += 4)
  82     data[i] = LE_READ_UINT32(input);
  83
  84   a = digest[0];
  85   b = digest[1];
  86   c = digest[2];
  87   d = digest[3];
  88
  89   DEBUG(-1);
  90   ROUND(F1, a, b, c, d, data[ 0] + 0xd76aa478, 7); DEBUG(0);
  91   ROUND(F1, d, a, b, c, data[ 1] + 0xe8c7b756, 12); DEBUG(1);
  92   ROUND(F1, c, d, a, b, data[ 2] + 0x242070db, 17);
  93   ROUND(F1, b, c, d, a, data[ 3] + 0xc1bdceee, 22);
  94   ROUND(F1, a, b, c, d, data[ 4] + 0xf57c0faf, 7);
  95   ROUND(F1, d, a, b, c, data[ 5] + 0x4787c62a, 12);
  96   ROUND(F1, c, d, a, b, data[ 6] + 0xa8304613, 17);
  97   ROUND(F1, b, c, d, a, data[ 7] + 0xfd469501, 22);
  98   ROUND(F1, a, b, c, d, data[ 8] + 0x698098d8, 7);
  99   ROUND(F1, d, a, b, c, data[ 9] + 0x8b44f7af, 12);
 100   ROUND(F1, c, d, a, b, data[10] + 0xffff5bb1, 17);
 101   ROUND(F1, b, c, d, a, data[11] + 0x895cd7be, 22);
 102   ROUND(F1, a, b, c, d, data[12] + 0x6b901122, 7);
 103   ROUND(F1, d, a, b, c, data[13] + 0xfd987193, 12);
 104   ROUND(F1, c, d, a, b, data[14] + 0xa679438e, 17);
 105   ROUND(F1, b, c, d, a, data[15] + 0x49b40821, 22); DEBUG(15);
 106
 107   ROUND(F2, a, b, c, d, data[ 1] + 0xf61e2562, 5); DEBUG(16);
 108   ROUND(F2, d, a, b, c, data[ 6] + 0xc040b340, 9); DEBUG(17);
 109   ROUND(F2, c, d, a, b, data[11] + 0x265e5a51, 14);
 110   ROUND(F2, b, c, d, a, data[ 0] + 0xe9b6c7aa, 20);
 111   ROUND(F2, a, b, c, d, data[ 5] + 0xd62f105d, 5);
 112   ROUND(F2, d, a, b, c, data[10] + 0x02441453, 9);
 113   ROUND(F2, c, d, a, b, data[15] + 0xd8a1e681, 14);
 114   ROUND(F2, b, c, d, a, data[ 4] + 0xe7d3fbc8, 20);
 115   ROUND(F2, a, b, c, d, data[ 9] + 0x21e1cde6, 5);
 116   ROUND(F2, d, a, b, c, data[14] + 0xc33707d6, 9);
 117   ROUND(F2, c, d, a, b, data[ 3] + 0xf4d50d87, 14);
 118   ROUND(F2, b, c, d, a, data[ 8] + 0x455a14ed, 20);
 119   ROUND(F2, a, b, c, d, data[13] + 0xa9e3e905, 5);
 120   ROUND(F2, d, a, b, c, data[ 2] + 0xfcefa3f8, 9);
 121   ROUND(F2, c, d, a, b, data[ 7] + 0x676f02d9, 14);
 122   ROUND(F2, b, c, d, a, data[12] + 0x8d2a4c8a, 20); DEBUG(31);
 123
 124   ROUND(F3, a, b, c, d, data[ 5] + 0xfffa3942, 4); DEBUG(32);
 125   ROUND(F3, d, a, b, c, data[ 8] + 0x8771f681, 11); DEBUG(33);
 126   ROUND(F3, c, d, a, b, data[11] + 0x6d9d6122, 16);
 127   ROUND(F3, b, c, d, a, data[14] + 0xfde5380c, 23);
 128   ROUND(F3, a, b, c, d, data[ 1] + 0xa4beea44, 4);
 129   ROUND(F3, d, a, b, c, data[ 4] + 0x4bdecfa9, 11);
 130   ROUND(F3, c, d, a, b, data[ 7] + 0xf6bb4b60, 16);
 131   ROUND(F3, b, c, d, a, data[10] + 0xbebfbc70, 23);
 132   ROUND(F3, a, b, c, d, data[13] + 0x289b7ec6, 4);
 133   ROUND(F3, d, a, b, c, data[ 0] + 0xeaa127fa, 11);
 134   ROUND(F3, c, d, a, b, data[ 3] + 0xd4ef3085, 16);
 135   ROUND(F3, b, c, d, a, data[ 6] + 0x04881d05, 23);
 136   ROUND(F3, a, b, c, d, data[ 9] + 0xd9d4d039, 4);
 137   ROUND(F3, d, a, b, c, data[12] + 0xe6db99e5, 11);
 138   ROUND(F3, c, d, a, b, data[15] + 0x1fa27cf8, 16);
 139   ROUND(F3, b, c, d, a, data[ 2] + 0xc4ac5665, 23); DEBUG(47);
 140
 141   ROUND(F4, a, b, c, d, data[ 0] + 0xf4292244, 6); DEBUG(48);
 142   ROUND(F4, d, a, b, c, data[ 7] + 0x432aff97, 10); DEBUG(49);
 143   ROUND(F4, c, d, a, b, data[14] + 0xab9423a7, 15);
 144   ROUND(F4, b, c, d, a, data[ 5] + 0xfc93a039, 21);
 145   ROUND(F4, a, b, c, d, data[12] + 0x655b59c3, 6);
 146   ROUND(F4, d, a, b, c, data[ 3] + 0x8f0ccc92, 10);
 147   ROUND(F4, c, d, a, b, data[10] + 0xffeff47d, 15);
 148   ROUND(F4, b, c, d, a, data[ 1] + 0x85845dd1, 21);
 149   ROUND(F4, a, b, c, d, data[ 8] + 0x6fa87e4f, 6);
 150   ROUND(F4, d, a, b, c, data[15] + 0xfe2ce6e0, 10);
 151   ROUND(F4, c, d, a, b, data[ 6] + 0xa3014314, 15);
 152   ROUND(F4, b, c, d, a, data[13] + 0x4e0811a1, 21);
 153   ROUND(F4, a, b, c, d, data[ 4] + 0xf7537e82, 6);
 154   ROUND(F4, d, a, b, c, data[11] + 0xbd3af235, 10);
 155   ROUND(F4, c, d, a, b, data[ 2] + 0x2ad7d2bb, 15);
 156   ROUND(F4, b, c, d, a, data[ 9] + 0xeb86d391, 21); DEBUG(63);
 157
 158   digest[0] += a;
 159   digest[1] += b;
 160   digest[2] += c;
 161   digest[3] += d;
 162 #if MD5_DEBUG
 163   fprintf(stderr, "99: %8x %8x %8x %8x\n",
 164           digest[0], digest[1], digest[2], digest[3]);
 165 #endif
 166
 167 }