src/add-ons/media/plugins/ape_reader/MAClib/MD5.cpp

   1 /*****************************************************************************
   2 *
   3 * "derived from the RSA Data Security, Inc. MD5 Message-Digest Algorithm".
   4 *
   5 * This program is free software; you can redistribute it and/or modify
   6 * it under the terms of the GNU General Public License as published by
   7 * the Free Software Foundation; either version 2 of the License, or
   8 * (at your option) any later version.
   9 *
  10 * This program is distributed in the hope that it will be useful,
  11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 * GNU General Public License for more details.
  14 *
  15 * You should have received a copy of the GNU General Public License
  16 * along with this program; if not, write to the Free Software
  17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  18 *
  19 *****************************************************************************/
  20
  21 #include "All.h"
  22 #include <string.h>
  23 #include "MD5.h"
  24
  25
  26 #if __BYTE_ORDER == __BIG_ENDIAN
  27 /*
  28  *  Block copy and convert byte order to little-endian.
  29  *  dst must be 32bit aligned.
  30  *  Length is the number of 32bit words
  31  */
  32 static void
  33 CopyToLittleEndian ( uint32_t*       dst,
  34                      const uint8_t*  src,
  35              size_t length )
  36 {
  37         for ( ; length--; src += 4, dst++ ) {
  38     *dst = (( (uint32_t) src [3] ) << 24) |
  39            (( (uint32_t) src [2] ) << 16) |
  40            (( (uint32_t) src [1] ) <<  8) |
  41            (( (uint32_t) src [0] ) <<  0);
  42
  43
  44     }
  45 }
  46 #endif
  47
  48
  49 /*
  50    Assembler versions of __MD5Transform, MD5Init and MD5Update
  51    currently exist for x86 and little-endian ARM.
  52    For other targets, we need to use the C versions below.
  53 */
  54
  55 //#if !(defined (__i386__) || ((defined (__arm__) && (__BYTE_ORDER == __LITTLE_ENDIAN))))
  56 #if 1   /* SHINTA */
  57
  58 /*
  59    Initialise the MD5 context.
  60 */
  61 void
  62 MD5Init ( MD5_CTX* context )
  63 {
  64     context -> count [0] = 0;
  65     context -> count [1] = 0;
  66
  67     context -> state [0] = 0x67452301;              /* Load magic constants. */
  68     context -> state [1] = 0xefcdab89;
  69     context -> state [2] = 0x98badcfe;
  70     context -> state [3] = 0x10325476;
  71 }
  72
  73 #define ROTATE_LEFT(x, n)         ((x << n) | (x >> (32-n)))
  74
  75 #define F(x, y, z)             (z ^ (x & (y ^ z)))
  76 #define G(x, y, z)             (y ^ (z & (x ^ y)))
  77 #define H(x, y, z)             (x ^ y ^ z)
  78 #define I(x, y, z)             (y ^ (x | ~z))
  79
  80 #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); }
  81 #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); }
  82 #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); }
  83 #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); }
  84
  85 static void
  86 __MD5Transform ( uint32_t        state [4],
  87          const uint8_t*  in,
  88          int             repeat )
  89 {
  90     const uint32_t*  x;
  91     uint32_t         a = state [0];
  92     uint32_t         b = state [1];
  93     uint32_t         c = state [2];
  94     uint32_t         d = state [3];
  95
  96     for ( ; repeat; repeat-- ) {
  97     uint32_t tempBuffer [16];
  98 #if __BYTE_ORDER == __BIG_ENDIAN
  99
 100     CopyToLittleEndian (tempBuffer, in, 16);
 101     x = tempBuffer;
 102 #else
 103     if ( (unsigned int)in & 3 ) {
 104         memcpy ( tempBuffer, in, 64 );
 105         x = tempBuffer;
 106     }
 107     else {
 108         x = (const uint32_t*) in;
 109     }
 110 #endif
 111
 112     FF (a, b, c, d, x[ 0],  7, 0xd76aa478); /*  1 */     /* Round 1 */
 113     FF (d, a, b, c, x[ 1], 12, 0xe8c7b756); /*  2 */
 114     FF (c, d, a, b, x[ 2], 17, 0x242070db); /*  3 */
 115     FF (b, c, d, a, x[ 3], 22, 0xc1bdceee); /*  4 */
 116     FF (a, b, c, d, x[ 4],  7, 0xf57c0faf); /*  5 */
 117     FF (d, a, b, c, x[ 5], 12, 0x4787c62a); /*  6 */
 118     FF (c, d, a, b, x[ 6], 17, 0xa8304613); /*  7 */
 119     FF (b, c, d, a, x[ 7], 22, 0xfd469501); /*  8 */
 120     FF (a, b, c, d, x[ 8],  7, 0x698098d8); /*  9 */
 121     FF (d, a, b, c, x[ 9], 12, 0x8b44f7af); /* 10 */
 122     FF (c, d, a, b, x[10], 17, 0xffff5bb1); /* 11 */
 123     FF (b, c, d, a, x[11], 22, 0x895cd7be); /* 12 */
 124     FF (a, b, c, d, x[12],  7, 0x6b901122); /* 13 */
 125     FF (d, a, b, c, x[13], 12, 0xfd987193); /* 14 */
 126     FF (c, d, a, b, x[14], 17, 0xa679438e); /* 15 */
 127     FF (b, c, d, a, x[15], 22, 0x49b40821); /* 16 */
 128
 129     GG (a, b, c, d, x[ 1],  5, 0xf61e2562); /* 17 */     /* Round 2 */
 130     GG (d, a, b, c, x[ 6],  9, 0xc040b340); /* 18 */
 131     GG (c, d, a, b, x[11], 14, 0x265e5a51); /* 19 */
 132     GG (b, c, d, a, x[ 0], 20, 0xe9b6c7aa); /* 20 */
 133     GG (a, b, c, d, x[ 5],  5, 0xd62f105d); /* 21 */
 134     GG (d, a, b, c, x[10],  9, 0x02441453); /* 22 */
 135     GG (c, d, a, b, x[15], 14, 0xd8a1e681); /* 23 */
 136     GG (b, c, d, a, x[ 4], 20, 0xe7d3fbc8); /* 24 */
 137     GG (a, b, c, d, x[ 9],  5, 0x21e1cde6); /* 25 */
 138     GG (d, a, b, c, x[14],  9, 0xc33707d6); /* 26 */
 139     GG (c, d, a, b, x[ 3], 14, 0xf4d50d87); /* 27 */
 140     GG (b, c, d, a, x[ 8], 20, 0x455a14ed); /* 28 */
 141     GG (a, b, c, d, x[13],  5, 0xa9e3e905); /* 29 */
 142     GG (d, a, b, c, x[ 2],  9, 0xfcefa3f8); /* 30 */
 143     GG (c, d, a, b, x[ 7], 14, 0x676f02d9); /* 31 */
 144     GG (b, c, d, a, x[12], 20, 0x8d2a4c8a); /* 32 */
 145
 146     HH (a, b, c, d, x[ 5],  4, 0xfffa3942); /* 33 */     /* Round 3 */
 147     HH (d, a, b, c, x[ 8], 11, 0x8771f681); /* 34 */
 148     HH (c, d, a, b, x[11], 16, 0x6d9d6122); /* 35 */
 149     HH (b, c, d, a, x[14], 23, 0xfde5380c); /* 36 */
 150     HH (a, b, c, d, x[ 1],  4, 0xa4beea44); /* 37 */
 151     HH (d, a, b, c, x[ 4], 11, 0x4bdecfa9); /* 38 */
 152     HH (c, d, a, b, x[ 7], 16, 0xf6bb4b60); /* 39 */
 153     HH (b, c, d, a, x[10], 23, 0xbebfbc70); /* 40 */
 154     HH (a, b, c, d, x[13],  4, 0x289b7ec6); /* 41 */
 155     HH (d, a, b, c, x[ 0], 11, 0xeaa127fa); /* 42 */
 156     HH (c, d, a, b, x[ 3], 16, 0xd4ef3085); /* 43 */
 157     HH (b, c, d, a, x[ 6], 23, 0x04881d05); /* 44 */
 158     HH (a, b, c, d, x[ 9],  4, 0xd9d4d039); /* 45 */
 159     HH (d, a, b, c, x[12], 11, 0xe6db99e5); /* 46 */
 160     HH (c, d, a, b, x[15], 16, 0x1fa27cf8); /* 47 */
 161     HH (b, c, d, a, x[ 2], 23, 0xc4ac5665); /* 48 */
 162
 163     II (a, b, c, d, x[ 0],  6, 0xf4292244); /* 49 */     /* Round 4 */
 164     II (d, a, b, c, x[ 7], 10, 0x432aff97); /* 50 */
 165     II (c, d, a, b, x[14], 15, 0xab9423a7); /* 51 */
 166     II (b, c, d, a, x[ 5], 21, 0xfc93a039); /* 52 */
 167     II (a, b, c, d, x[12],  6, 0x655b59c3); /* 53 */
 168     II (d, a, b, c, x[ 3], 10, 0x8f0ccc92); /* 54 */
 169     II (c, d, a, b, x[10], 15, 0xffeff47d); /* 55 */
 170     II (b, c, d, a, x[ 1], 21, 0x85845dd1); /* 56 */
 171     II (a, b, c, d, x[ 8],  6, 0x6fa87e4f); /* 57 */
 172     II (d, a, b, c, x[15], 10, 0xfe2ce6e0); /* 58 */
 173     II (c, d, a, b, x[ 6], 15, 0xa3014314); /* 59 */
 174     II (b, c, d, a, x[13], 21, 0x4e0811a1); /* 60 */
 175     II (a, b, c, d, x[ 4],  6, 0xf7537e82); /* 61 */
 176     II (d, a, b, c, x[11], 10, 0xbd3af235); /* 62 */
 177     II (c, d, a, b, x[ 2], 15, 0x2ad7d2bb); /* 63 */
 178     II (b, c, d, a, x[ 9], 21, 0xeb86d391); /* 64 */
 179
 180     state [0] = a = a + state [0];
 181     state [1] = b = b + state [1];
 182     state [2] = c = c + state [2];
 183     state [3] = d = d + state [3];
 184
 185     in += 64;
 186     }
 187 }
 188
 189
 190 /*
 191    MD5 block update operation:
 192    Process another sub-string of the message and update the context.
 193 */
 194
 195 void
 196 MD5Update ( MD5_CTX*        context,
 197             const uint8_t*  input,
 198         size_t          inputBytes )
 199 {
 200     int           byteIndex;
 201     unsigned int  partLen;
 202     int           len;
 203     int           i;
 204
 205     /* Compute number of bytes mod 64 */
 206     byteIndex = (context -> count[0] >> 3) & 0x3F;
 207
 208     /* Update number of bits: count += 8 * inputBytes */
 209     if ( (context -> count [0] += inputBytes << 3) < (inputBytes << 3) )
 210     context -> count [1]++;
 211     context -> count [1] += inputBytes >> (32 - 3);
 212
 213     partLen = (64 - byteIndex);
 214
 215     /* Transform as many times as possible. */
 216     if ( inputBytes >= partLen ) {
 217     memcpy ( context -> buffer + byteIndex, input, partLen );
 218     __MD5Transform ( context -> state, (const uint8_t*) context -> buffer, 1 );
 219     len       = ( inputBytes - partLen ) >> 6;
 220     __MD5Transform ( context -> state, input + partLen, len );
 221     i         = partLen + (len << 6);
 222     byteIndex = 0;
 223     }
 224     else {
 225     i         = 0;
 226     }
 227
 228     /* Buffer remaining input */
 229     memcpy ( (context -> buffer) + byteIndex, input + i, inputBytes - i );
 230 }
 231
 232 #endif
 233
 234
 235 void
 236 MD5Final ( uint8_t   digest [16],
 237        MD5_CTX*  context )
 238 {
 239     static uint8_t  finalBlock [64];
 240     uint32_t        bits        [2];
 241     int             byteIndex;
 242     int             finalBlockLength;
 243
 244     byteIndex        = (context -> count[0] >> 3) & 0x3F;
 245     finalBlockLength = (byteIndex < 56  ?  56  :  120) - byteIndex;
 246     finalBlock[0]    = 0x80;
 247
 248 #if __BYTE_ORDER == __BIG_ENDIAN
 249     CopyToLittleEndian ( bits, (const uint8_t*) context -> count, 2 );
 250 #else
 251     memcpy ( bits, context->count, 8 );
 252 #endif
 253
 254     MD5Update ( context, finalBlock, finalBlockLength );
 255     MD5Update ( context, (const uint8_t*) bits, 8 );
 256
 257 #if __BYTE_ORDER == __BIG_ENDIAN
 258     CopyToLittleEndian ( (uint32_t*) digest, (const uint8_t*) context -> state, 4 );
 259 #else
 260     memcpy ( digest, context -> state, 16 );
 261 #endif
 262
 263     memset ( context, 0, sizeof (*context) );
 264 }
 265