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annotate src/md5/md5.c @ 366:41958685480d

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Switched to `type *name' style Andrew Koenig's ``C Traps and Pitfalls'' (Ch.2.1) convinced me that it is best to go with the way C had been designed. The ``declaration reflects use'' concept conflicts with a ``type* name'' notation. Hence I switched.
author markus schnalke <meillo@marmaro.de>
date Thu, 22 Sep 2011 15:07:40 +0200
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meillo@209 1 /*
meillo@209 2 * This is an OpenSSL-compatible implementation of the RSA Data Security,
meillo@209 3 * Inc. MD5 Message-Digest Algorithm (RFC 1321).
meillo@209 4 *
meillo@209 5 * Written by Solar Designer <solar at openwall.com> in 2001, and placed
meillo@209 6 * in the public domain. There's absolutely no warranty.
meillo@209 7 *
meillo@209 8 * This differs from Colin Plumb's older public domain implementation in
meillo@209 9 * that no 32-bit integer data type is required, there's no compile-time
meillo@209 10 * endianness configuration, and the function prototypes match OpenSSL's.
meillo@209 11 * The primary goals are portability and ease of use.
meillo@209 12 *
meillo@209 13 * This implementation is meant to be fast, but not as fast as possible.
meillo@209 14 * Some known optimizations are not included to reduce source code size
meillo@209 15 * and avoid compile-time configuration.
meillo@209 16 */
meillo@209 17
meillo@209 18 #ifndef HAVE_OPENSSL
meillo@209 19
meillo@209 20 #include <string.h>
meillo@209 21
meillo@209 22 #include "md5.h"
meillo@209 23
meillo@209 24 /*
meillo@209 25 * The basic MD5 functions.
meillo@209 26 *
meillo@209 27 * F and G are optimized compared to their RFC 1321 definitions for
meillo@209 28 * architectures that lack an AND-NOT instruction, just like in Colin Plumb's
meillo@209 29 * implementation.
meillo@209 30 */
meillo@209 31 #define F(x, y, z) ((z) ^ ((x) & ((y) ^ (z))))
meillo@209 32 #define G(x, y, z) ((y) ^ ((z) & ((x) ^ (y))))
meillo@209 33 #define H(x, y, z) ((x) ^ (y) ^ (z))
meillo@209 34 #define I(x, y, z) ((y) ^ ((x) | ~(z)))
meillo@209 35
meillo@209 36 /*
meillo@209 37 * The MD5 transformation for all four rounds.
meillo@209 38 */
meillo@209 39 #define STEP(f, a, b, c, d, x, t, s) \
meillo@209 40 (a) += f((b), (c), (d)) + (x) + (t); \
meillo@209 41 (a) = (((a) << (s)) | (((a) & 0xffffffff) >> (32 - (s)))); \
meillo@209 42 (a) += (b);
meillo@209 43
meillo@209 44 /*
meillo@209 45 * SET reads 4 input bytes in little-endian byte order and stores them
meillo@209 46 * in a properly aligned word in host byte order.
meillo@209 47 *
meillo@209 48 * The check for little-endian architectures that tolerate unaligned
meillo@209 49 * memory accesses is just an optimization. Nothing will break if it
meillo@209 50 * doesn't work.
meillo@209 51 */
meillo@209 52 #if defined(__i386__) || defined(__x86_64__) || defined(__vax__)
meillo@209 53 #define SET(n) \
meillo@209 54 (*(MD5_u32plus *)&ptr[(n) * 4])
meillo@209 55 #define GET(n) \
meillo@209 56 SET(n)
meillo@209 57 #else
meillo@209 58 #define SET(n) \
meillo@209 59 (ctx->block[(n)] = \
meillo@209 60 (MD5_u32plus)ptr[(n) * 4] | \
meillo@209 61 ((MD5_u32plus)ptr[(n) * 4 + 1] << 8) | \
meillo@209 62 ((MD5_u32plus)ptr[(n) * 4 + 2] << 16) | \
meillo@209 63 ((MD5_u32plus)ptr[(n) * 4 + 3] << 24))
meillo@209 64 #define GET(n) \
meillo@209 65 (ctx->block[(n)])
meillo@209 66 #endif
meillo@209 67
meillo@209 68 /*
meillo@209 69 * This processes one or more 64-byte data blocks, but does NOT update
meillo@209 70 * the bit counters. There are no alignment requirements.
meillo@209 71 */
meillo@209 72 static void *body(MD5_CTX *ctx, void *data, unsigned long size)
meillo@209 73 {
meillo@209 74 unsigned char *ptr;
meillo@209 75 MD5_u32plus a, b, c, d;
meillo@209 76 MD5_u32plus saved_a, saved_b, saved_c, saved_d;
meillo@209 77
meillo@209 78 ptr = data;
meillo@209 79
meillo@209 80 a = ctx->a;
meillo@209 81 b = ctx->b;
meillo@209 82 c = ctx->c;
meillo@209 83 d = ctx->d;
meillo@209 84
meillo@209 85 do {
meillo@209 86 saved_a = a;
meillo@209 87 saved_b = b;
meillo@209 88 saved_c = c;
meillo@209 89 saved_d = d;
meillo@209 90
meillo@209 91 /* Round 1 */
meillo@209 92 STEP(F, a, b, c, d, SET(0), 0xd76aa478, 7)
meillo@209 93 STEP(F, d, a, b, c, SET(1), 0xe8c7b756, 12)
meillo@209 94 STEP(F, c, d, a, b, SET(2), 0x242070db, 17)
meillo@209 95 STEP(F, b, c, d, a, SET(3), 0xc1bdceee, 22)
meillo@209 96 STEP(F, a, b, c, d, SET(4), 0xf57c0faf, 7)
meillo@209 97 STEP(F, d, a, b, c, SET(5), 0x4787c62a, 12)
meillo@209 98 STEP(F, c, d, a, b, SET(6), 0xa8304613, 17)
meillo@209 99 STEP(F, b, c, d, a, SET(7), 0xfd469501, 22)
meillo@209 100 STEP(F, a, b, c, d, SET(8), 0x698098d8, 7)
meillo@209 101 STEP(F, d, a, b, c, SET(9), 0x8b44f7af, 12)
meillo@209 102 STEP(F, c, d, a, b, SET(10), 0xffff5bb1, 17)
meillo@209 103 STEP(F, b, c, d, a, SET(11), 0x895cd7be, 22)
meillo@209 104 STEP(F, a, b, c, d, SET(12), 0x6b901122, 7)
meillo@209 105 STEP(F, d, a, b, c, SET(13), 0xfd987193, 12)
meillo@209 106 STEP(F, c, d, a, b, SET(14), 0xa679438e, 17)
meillo@209 107 STEP(F, b, c, d, a, SET(15), 0x49b40821, 22)
meillo@209 108
meillo@209 109 /* Round 2 */
meillo@209 110 STEP(G, a, b, c, d, GET(1), 0xf61e2562, 5)
meillo@209 111 STEP(G, d, a, b, c, GET(6), 0xc040b340, 9)
meillo@209 112 STEP(G, c, d, a, b, GET(11), 0x265e5a51, 14)
meillo@209 113 STEP(G, b, c, d, a, GET(0), 0xe9b6c7aa, 20)
meillo@209 114 STEP(G, a, b, c, d, GET(5), 0xd62f105d, 5)
meillo@209 115 STEP(G, d, a, b, c, GET(10), 0x02441453, 9)
meillo@209 116 STEP(G, c, d, a, b, GET(15), 0xd8a1e681, 14)
meillo@209 117 STEP(G, b, c, d, a, GET(4), 0xe7d3fbc8, 20)
meillo@209 118 STEP(G, a, b, c, d, GET(9), 0x21e1cde6, 5)
meillo@209 119 STEP(G, d, a, b, c, GET(14), 0xc33707d6, 9)
meillo@209 120 STEP(G, c, d, a, b, GET(3), 0xf4d50d87, 14)
meillo@209 121 STEP(G, b, c, d, a, GET(8), 0x455a14ed, 20)
meillo@209 122 STEP(G, a, b, c, d, GET(13), 0xa9e3e905, 5)
meillo@209 123 STEP(G, d, a, b, c, GET(2), 0xfcefa3f8, 9)
meillo@209 124 STEP(G, c, d, a, b, GET(7), 0x676f02d9, 14)
meillo@209 125 STEP(G, b, c, d, a, GET(12), 0x8d2a4c8a, 20)
meillo@209 126
meillo@209 127 /* Round 3 */
meillo@209 128 STEP(H, a, b, c, d, GET(5), 0xfffa3942, 4)
meillo@209 129 STEP(H, d, a, b, c, GET(8), 0x8771f681, 11)
meillo@209 130 STEP(H, c, d, a, b, GET(11), 0x6d9d6122, 16)
meillo@209 131 STEP(H, b, c, d, a, GET(14), 0xfde5380c, 23)
meillo@209 132 STEP(H, a, b, c, d, GET(1), 0xa4beea44, 4)
meillo@209 133 STEP(H, d, a, b, c, GET(4), 0x4bdecfa9, 11)
meillo@209 134 STEP(H, c, d, a, b, GET(7), 0xf6bb4b60, 16)
meillo@209 135 STEP(H, b, c, d, a, GET(10), 0xbebfbc70, 23)
meillo@209 136 STEP(H, a, b, c, d, GET(13), 0x289b7ec6, 4)
meillo@209 137 STEP(H, d, a, b, c, GET(0), 0xeaa127fa, 11)
meillo@209 138 STEP(H, c, d, a, b, GET(3), 0xd4ef3085, 16)
meillo@209 139 STEP(H, b, c, d, a, GET(6), 0x04881d05, 23)
meillo@209 140 STEP(H, a, b, c, d, GET(9), 0xd9d4d039, 4)
meillo@209 141 STEP(H, d, a, b, c, GET(12), 0xe6db99e5, 11)
meillo@209 142 STEP(H, c, d, a, b, GET(15), 0x1fa27cf8, 16)
meillo@209 143 STEP(H, b, c, d, a, GET(2), 0xc4ac5665, 23)
meillo@209 144
meillo@209 145 /* Round 4 */
meillo@209 146 STEP(I, a, b, c, d, GET(0), 0xf4292244, 6)
meillo@209 147 STEP(I, d, a, b, c, GET(7), 0x432aff97, 10)
meillo@209 148 STEP(I, c, d, a, b, GET(14), 0xab9423a7, 15)
meillo@209 149 STEP(I, b, c, d, a, GET(5), 0xfc93a039, 21)
meillo@209 150 STEP(I, a, b, c, d, GET(12), 0x655b59c3, 6)
meillo@209 151 STEP(I, d, a, b, c, GET(3), 0x8f0ccc92, 10)
meillo@209 152 STEP(I, c, d, a, b, GET(10), 0xffeff47d, 15)
meillo@209 153 STEP(I, b, c, d, a, GET(1), 0x85845dd1, 21)
meillo@209 154 STEP(I, a, b, c, d, GET(8), 0x6fa87e4f, 6)
meillo@209 155 STEP(I, d, a, b, c, GET(15), 0xfe2ce6e0, 10)
meillo@209 156 STEP(I, c, d, a, b, GET(6), 0xa3014314, 15)
meillo@209 157 STEP(I, b, c, d, a, GET(13), 0x4e0811a1, 21)
meillo@209 158 STEP(I, a, b, c, d, GET(4), 0xf7537e82, 6)
meillo@209 159 STEP(I, d, a, b, c, GET(11), 0xbd3af235, 10)
meillo@209 160 STEP(I, c, d, a, b, GET(2), 0x2ad7d2bb, 15)
meillo@209 161 STEP(I, b, c, d, a, GET(9), 0xeb86d391, 21)
meillo@209 162
meillo@209 163 a += saved_a;
meillo@209 164 b += saved_b;
meillo@209 165 c += saved_c;
meillo@209 166 d += saved_d;
meillo@209 167
meillo@209 168 ptr += 64;
meillo@209 169 } while (size -= 64);
meillo@209 170
meillo@209 171 ctx->a = a;
meillo@209 172 ctx->b = b;
meillo@209 173 ctx->c = c;
meillo@209 174 ctx->d = d;
meillo@209 175
meillo@209 176 return ptr;
meillo@209 177 }
meillo@209 178
meillo@209 179 void MD5_Init(MD5_CTX *ctx)
meillo@209 180 {
meillo@209 181 ctx->a = 0x67452301;
meillo@209 182 ctx->b = 0xefcdab89;
meillo@209 183 ctx->c = 0x98badcfe;
meillo@209 184 ctx->d = 0x10325476;
meillo@209 185
meillo@209 186 ctx->lo = 0;
meillo@209 187 ctx->hi = 0;
meillo@209 188 }
meillo@209 189
meillo@209 190 void MD5_Update(MD5_CTX *ctx, void *data, unsigned long size)
meillo@209 191 {
meillo@209 192 MD5_u32plus saved_lo;
meillo@209 193 unsigned long used, free;
meillo@209 194
meillo@209 195 saved_lo = ctx->lo;
meillo@209 196 if ((ctx->lo = (saved_lo + size) & 0x1fffffff) < saved_lo)
meillo@209 197 ctx->hi++;
meillo@209 198 ctx->hi += size >> 29;
meillo@209 199
meillo@209 200 used = saved_lo & 0x3f;
meillo@209 201
meillo@209 202 if (used) {
meillo@209 203 free = 64 - used;
meillo@209 204
meillo@209 205 if (size < free) {
meillo@209 206 memcpy(&ctx->buffer[used], data, size);
meillo@209 207 return;
meillo@209 208 }
meillo@209 209
meillo@209 210 memcpy(&ctx->buffer[used], data, free);
meillo@209 211 data = (unsigned char *)data + free;
meillo@209 212 size -= free;
meillo@209 213 body(ctx, ctx->buffer, 64);
meillo@209 214 }
meillo@209 215
meillo@209 216 if (size >= 64) {
meillo@209 217 data = body(ctx, data, size & ~(unsigned long)0x3f);
meillo@209 218 size &= 0x3f;
meillo@209 219 }
meillo@209 220
meillo@209 221 memcpy(ctx->buffer, data, size);
meillo@209 222 }
meillo@209 223
meillo@209 224 void MD5_Final(unsigned char *result, MD5_CTX *ctx)
meillo@209 225 {
meillo@209 226 unsigned long used, free;
meillo@209 227
meillo@209 228 used = ctx->lo & 0x3f;
meillo@209 229
meillo@209 230 ctx->buffer[used++] = 0x80;
meillo@209 231
meillo@209 232 free = 64 - used;
meillo@209 233
meillo@209 234 if (free < 8) {
meillo@209 235 memset(&ctx->buffer[used], 0, free);
meillo@209 236 body(ctx, ctx->buffer, 64);
meillo@209 237 used = 0;
meillo@209 238 free = 64;
meillo@209 239 }
meillo@209 240
meillo@209 241 memset(&ctx->buffer[used], 0, free - 8);
meillo@209 242
meillo@209 243 ctx->lo <<= 3;
meillo@209 244 ctx->buffer[56] = ctx->lo;
meillo@209 245 ctx->buffer[57] = ctx->lo >> 8;
meillo@209 246 ctx->buffer[58] = ctx->lo >> 16;
meillo@209 247 ctx->buffer[59] = ctx->lo >> 24;
meillo@209 248 ctx->buffer[60] = ctx->hi;
meillo@209 249 ctx->buffer[61] = ctx->hi >> 8;
meillo@209 250 ctx->buffer[62] = ctx->hi >> 16;
meillo@209 251 ctx->buffer[63] = ctx->hi >> 24;
meillo@209 252
meillo@209 253 body(ctx, ctx->buffer, 64);
meillo@209 254
meillo@209 255 result[0] = ctx->a;
meillo@209 256 result[1] = ctx->a >> 8;
meillo@209 257 result[2] = ctx->a >> 16;
meillo@209 258 result[3] = ctx->a >> 24;
meillo@209 259 result[4] = ctx->b;
meillo@209 260 result[5] = ctx->b >> 8;
meillo@209 261 result[6] = ctx->b >> 16;
meillo@209 262 result[7] = ctx->b >> 24;
meillo@209 263 result[8] = ctx->c;
meillo@209 264 result[9] = ctx->c >> 8;
meillo@209 265 result[10] = ctx->c >> 16;
meillo@209 266 result[11] = ctx->c >> 24;
meillo@209 267 result[12] = ctx->d;
meillo@209 268 result[13] = ctx->d >> 8;
meillo@209 269 result[14] = ctx->d >> 16;
meillo@209 270 result[15] = ctx->d >> 24;
meillo@209 271
meillo@209 272 memset(ctx, 0, sizeof(*ctx));
meillo@209 273 }
meillo@209 274
meillo@209 275 #endif