md5.c 7.39 KB
 Niels Möller committed Sep 03, 1998 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 ``````/* * \$Id\$ * * md5.c : Implementation of the MD5 hash function * * Part of the Python Cryptography Toolkit, version 1.0.1 * Colin Plumb's original code modified by A.M. Kuchling * * Further hacked and adapted to pike by Niels Mller */ #include "crypto_types.h" #include "md5.h" void md5_copy(struct md5_ctx *dest, struct md5_ctx *src) { int i; dest->count_l=src->count_l; dest->count_h=src->count_h; for(i=0; idigest[i]=src->digest[i]; for(i=0; i < src->index; i++) dest->block[i] = src->block[i]; dest->index = src->index; } void md5_init(struct md5_ctx *ctx) { ctx->digest[0] = 0x67452301; ctx->digest[1] = 0xefcdab89; ctx->digest[2] = 0x98badcfe; ctx->digest[3] = 0x10325476; ctx->count_l = ctx->count_h = 0; ctx->index = 0; } /* MD5 functions */ #define F1(x, y, z) (z ^ (x & (y ^ z))) #define F2(x, y, z) F1(z, x, y) #define F3(x, y, z) (x ^ y ^ z) #define F4(x, y, z) (y ^ (x | ~z)) #define ROUND(f, w, x, y, z, data, s) \ ( w += f(x, y, z) + data, w = w<>(32-s), w += x ) /* Perform the MD5 transformation on one full block of 16 32-bit words. */ `````` Niels Möller committed Sep 03, 1998 49 ``````static void md5_transform(struct md5_ctx *ctx, UINT32 *data) `````` Niels Möller committed Sep 03, 1998 50 ``````{ `````` Niels Möller committed Sep 03, 1998 51 `````` UINT32 a, b, c, d; `````` Niels Möller committed Sep 03, 1998 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 `````` a = ctx->digest[0]; b = ctx->digest[1]; c = ctx->digest[2]; d = ctx->digest[3]; ROUND(F1, a, b, c, d, data[ 0] + 0xd76aa478, 7); ROUND(F1, d, a, b, c, data[ 1] + 0xe8c7b756, 12); ROUND(F1, c, d, a, b, data[ 2] + 0x242070db, 17); ROUND(F1, b, c, d, a, data[ 3] + 0xc1bdceee, 22); ROUND(F1, a, b, c, d, data[ 4] + 0xf57c0faf, 7); ROUND(F1, d, a, b, c, data[ 5] + 0x4787c62a, 12); ROUND(F1, c, d, a, b, data[ 6] + 0xa8304613, 17); ROUND(F1, b, c, d, a, data[ 7] + 0xfd469501, 22); ROUND(F1, a, b, c, d, data[ 8] + 0x698098d8, 7); ROUND(F1, d, a, b, c, data[ 9] + 0x8b44f7af, 12); ROUND(F1, c, d, a, b, data[10] + 0xffff5bb1, 17); ROUND(F1, b, c, d, a, data[11] + 0x895cd7be, 22); ROUND(F1, a, b, c, d, data[12] + 0x6b901122, 7); ROUND(F1, d, a, b, c, data[13] + 0xfd987193, 12); ROUND(F1, c, d, a, b, data[14] + 0xa679438e, 17); ROUND(F1, b, c, d, a, data[15] + 0x49b40821, 22); ROUND(F2, a, b, c, d, data[ 1] + 0xf61e2562, 5); ROUND(F2, d, a, b, c, data[ 6] + 0xc040b340, 9); ROUND(F2, c, d, a, b, data[11] + 0x265e5a51, 14); ROUND(F2, b, c, d, a, data[ 0] + 0xe9b6c7aa, 20); ROUND(F2, a, b, c, d, data[ 5] + 0xd62f105d, 5); ROUND(F2, d, a, b, c, data[10] + 0x02441453, 9); ROUND(F2, c, d, a, b, data[15] + 0xd8a1e681, 14); ROUND(F2, b, c, d, a, data[ 4] + 0xe7d3fbc8, 20); ROUND(F2, a, b, c, d, data[ 9] + 0x21e1cde6, 5); ROUND(F2, d, a, b, c, data[14] + 0xc33707d6, 9); ROUND(F2, c, d, a, b, data[ 3] + 0xf4d50d87, 14); ROUND(F2, b, c, d, a, data[ 8] + 0x455a14ed, 20); ROUND(F2, a, b, c, d, data[13] + 0xa9e3e905, 5); ROUND(F2, d, a, b, c, data[ 2] + 0xfcefa3f8, 9); ROUND(F2, c, d, a, b, data[ 7] + 0x676f02d9, 14); ROUND(F2, b, c, d, a, data[12] + 0x8d2a4c8a, 20); ROUND(F3, a, b, c, d, data[ 5] + 0xfffa3942, 4); ROUND(F3, d, a, b, c, data[ 8] + 0x8771f681, 11); ROUND(F3, c, d, a, b, data[11] + 0x6d9d6122, 16); ROUND(F3, b, c, d, a, data[14] + 0xfde5380c, 23); ROUND(F3, a, b, c, d, data[ 1] + 0xa4beea44, 4); ROUND(F3, d, a, b, c, data[ 4] + 0x4bdecfa9, 11); ROUND(F3, c, d, a, b, data[ 7] + 0xf6bb4b60, 16); ROUND(F3, b, c, d, a, data[10] + 0xbebfbc70, 23); ROUND(F3, a, b, c, d, data[13] + 0x289b7ec6, 4); ROUND(F3, d, a, b, c, data[ 0] + 0xeaa127fa, 11); ROUND(F3, c, d, a, b, data[ 3] + 0xd4ef3085, 16); ROUND(F3, b, c, d, a, data[ 6] + 0x04881d05, 23); ROUND(F3, a, b, c, d, data[ 9] + 0xd9d4d039, 4); ROUND(F3, d, a, b, c, data[12] + 0xe6db99e5, 11); ROUND(F3, c, d, a, b, data[15] + 0x1fa27cf8, 16); ROUND(F3, b, c, d, a, data[ 2] + 0xc4ac5665, 23); ROUND(F4, a, b, c, d, data[ 0] + 0xf4292244, 6); ROUND(F4, d, a, b, c, data[ 7] + 0x432aff97, 10); ROUND(F4, c, d, a, b, data[14] + 0xab9423a7, 15); ROUND(F4, b, c, d, a, data[ 5] + 0xfc93a039, 21); ROUND(F4, a, b, c, d, data[12] + 0x655b59c3, 6); ROUND(F4, d, a, b, c, data[ 3] + 0x8f0ccc92, 10); ROUND(F4, c, d, a, b, data[10] + 0xffeff47d, 15); ROUND(F4, b, c, d, a, data[ 1] + 0x85845dd1, 21); ROUND(F4, a, b, c, d, data[ 8] + 0x6fa87e4f, 6); ROUND(F4, d, a, b, c, data[15] + 0xfe2ce6e0, 10); ROUND(F4, c, d, a, b, data[ 6] + 0xa3014314, 15); ROUND(F4, b, c, d, a, data[13] + 0x4e0811a1, 21); ROUND(F4, a, b, c, d, data[ 4] + 0xf7537e82, 6); ROUND(F4, d, a, b, c, data[11] + 0xbd3af235, 10); ROUND(F4, c, d, a, b, data[ 2] + 0x2ad7d2bb, 15); ROUND(F4, b, c, d, a, data[ 9] + 0xeb86d391, 21); ctx->digest[0] += a; ctx->digest[1] += b; ctx->digest[2] += c; ctx->digest[3] += d; } #ifndef EXTRACT_UCHAR #define EXTRACT_UCHAR(p) (*(unsigned char *)(p)) #endif /* Note that MD5 uses little endian byteorder */ #define STRING2INT(s) ((((((EXTRACT_UCHAR(s+3) << 8) \ | EXTRACT_UCHAR(s+2)) << 8) \ | EXTRACT_UCHAR(s+1)) << 8) \ | EXTRACT_UCHAR(s)) `````` Niels Möller committed Sep 03, 1998 141 ``````static void md5_block(struct md5_ctx *ctx, UINT8 *block) `````` Niels Möller committed Sep 03, 1998 142 ``````{ `````` Niels Möller committed Sep 03, 1998 143 `````` UINT32 data[MD5_DATALEN]; `````` Niels Möller committed Sep 03, 1998 144 145 146 147 148 149 150 151 152 153 154 155 156 157 `````` int i; /* Update block count */ if (!++ctx->count_l) ++ctx->count_h; /* Endian independent conversion */ for (i = 0; i<16; i++, block += 4) data[i] = STRING2INT(block); md5_transform(ctx, data); } void md5_update(struct md5_ctx *ctx, `````` Niels Möller committed Sep 03, 1998 158 159 `````` UINT8 *buffer, UINT32 len) `````` Niels Möller committed Sep 03, 1998 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 ``````{ if (ctx->index) { /* Try to fill partial block */ unsigned left = MD5_DATASIZE - ctx->index; if (len < left) { memcpy(ctx->block + ctx->index, buffer, len); ctx->index += len; return; /* Finished */ } else { memcpy(ctx->block + ctx->index, buffer, left); md5_block(ctx, ctx->block); buffer += left; len -= left; } } while (len >= MD5_DATASIZE) { md5_block(ctx, buffer); buffer += MD5_DATASIZE; len -= MD5_DATASIZE; } if ((ctx->index = len)) /* This assignment is intended */ /* Buffer leftovers */ memcpy(ctx->block, buffer, len); } /* Final wrapup - pad to MD5_DATASIZE-byte boundary with the bit pattern 1 0* (64-bit count of bits processed, LSB-first) */ void md5_final(struct md5_ctx *ctx) { `````` Niels Möller committed Sep 03, 1998 194 `````` UINT32 data[MD5_DATALEN]; `````` Niels Möller committed Sep 03, 1998 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 `````` int i; int words; i = ctx->index; /* Set the first char of padding to 0x80. This is safe since there is always at least one byte free */ ctx->block[i++] = 0x80; /* Fill rest of word */ for( ; i & 3; i++) ctx->block[i] = 0; /* i is now a multiple of the word size 4 */ words = i >> 2; for (i = 0; i < words; i++) data[i] = STRING2INT(ctx->block + 4*i); if (words > (MD5_DATALEN-2)) { /* No room for length in this block. Process it and * pad with another one */ for (i = words ; i < MD5_DATALEN; i++) data[i] = 0; md5_transform(ctx, data); for (i = 0; i < (MD5_DATALEN-2); i++) data[i] = 0; } else for (i = words ; i < MD5_DATALEN - 2; i++) data[i] = 0; /* Theres 512 = 2^9 bits in one block * Little-endian order => Least significant word first */ data[MD5_DATALEN-1] = (ctx->count_h << 9) | (ctx->count_l >> 23); data[MD5_DATALEN-2] = (ctx->count_l << 9) | (ctx->index << 3); md5_transform(ctx, data); } `````` Niels Möller committed Sep 03, 1998 231 ``````void md5_digest(struct md5_ctx *ctx, UINT8 *s) `````` Niels Möller committed Sep 03, 1998 232 233 234 235 236 237 238 239 240 241 242 243 ``````{ int i; /* Little endian order */ for (i = 0; i < MD5_DIGESTLEN; i++) { *s++ = 0xff & ctx->digest[i]; *s++ = 0xff & (ctx->digest[i] >> 8); *s++ = 0xff & (ctx->digest[i] >> 16); *s++ = ctx->digest[i] >> 24; } }``````