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annotate src/md5/md5c.c @ 163:3914d7cabfbc

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author meillo@marmaro.de
date Thu, 08 Jul 2010 14:04:39 +0200
parents 08114f7dcc23
children
rev   line source
meillo@0 1 /* MD5C.C - RSA Data Security, Inc., MD5 message-digest algorithm
meillo@0 2 */
meillo@0 3
meillo@0 4 /* Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
meillo@0 5 rights reserved.
meillo@0 6
meillo@0 7 License to copy and use this software is granted provided that it
meillo@0 8 is identified as the "RSA Data Security, Inc. MD5 Message-Digest
meillo@0 9 Algorithm" in all material mentioning or referencing this software
meillo@0 10 or this function.
meillo@0 11
meillo@0 12 License is also granted to make and use derivative works provided
meillo@0 13 that such works are identified as "derived from the RSA Data
meillo@0 14 Security, Inc. MD5 Message-Digest Algorithm" in all material
meillo@0 15 mentioning or referencing the derived work.
meillo@0 16
meillo@0 17 RSA Data Security, Inc. makes no representations concerning either
meillo@0 18 the merchantability of this software or the suitability of this
meillo@0 19 software for any particular purpose. It is provided "as is"
meillo@0 20 without express or implied warranty of any kind.
meillo@0 21
meillo@0 22 These notices must be retained in any copies of any part of this
meillo@0 23 documentation and/or software.
meillo@0 24 */
meillo@0 25
meillo@0 26 #include "global.h"
meillo@0 27 #include "md5.h"
meillo@0 28
meillo@0 29 /* Constants for MD5Transform routine.
meillo@0 30 */
meillo@0 31 #define S11 7
meillo@0 32 #define S12 12
meillo@0 33 #define S13 17
meillo@0 34 #define S14 22
meillo@0 35 #define S21 5
meillo@0 36 #define S22 9
meillo@0 37 #define S23 14
meillo@0 38 #define S24 20
meillo@0 39 #define S31 4
meillo@0 40 #define S32 11
meillo@0 41 #define S33 16
meillo@0 42 #define S34 23
meillo@0 43 #define S41 6
meillo@0 44 #define S42 10
meillo@0 45 #define S43 15
meillo@0 46 #define S44 21
meillo@0 47
meillo@10 48 static void MD5Transform PROTO_LIST((UINT4[4], unsigned char[64]));
meillo@10 49 static void Encode PROTO_LIST((unsigned char *, UINT4 *, unsigned int));
meillo@10 50 static void Decode PROTO_LIST((UINT4 *, unsigned char *, unsigned int));
meillo@10 51 static void MD5_memcpy PROTO_LIST((POINTER, POINTER, unsigned int));
meillo@10 52 static void MD5_memset PROTO_LIST((POINTER, int, unsigned int));
meillo@0 53
meillo@0 54 static unsigned char PADDING[64] = {
meillo@10 55 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
meillo@10 56 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
meillo@10 57 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
meillo@0 58 };
meillo@0 59
meillo@0 60 /* F, G, H and I are basic MD5 functions.
meillo@0 61 */
meillo@0 62 #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
meillo@0 63 #define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
meillo@0 64 #define H(x, y, z) ((x) ^ (y) ^ (z))
meillo@0 65 #define I(x, y, z) ((y) ^ ((x) | (~z)))
meillo@0 66
meillo@0 67 /* ROTATE_LEFT rotates x left n bits.
meillo@0 68 */
meillo@0 69 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
meillo@0 70
meillo@0 71 /* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
meillo@0 72 Rotation is separate from addition to prevent recomputation.
meillo@0 73 */
meillo@0 74 #define FF(a, b, c, d, x, s, ac) { \
meillo@0 75 (a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
meillo@0 76 (a) = ROTATE_LEFT ((a), (s)); \
meillo@0 77 (a) += (b); \
meillo@0 78 }
meillo@0 79 #define GG(a, b, c, d, x, s, ac) { \
meillo@0 80 (a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
meillo@0 81 (a) = ROTATE_LEFT ((a), (s)); \
meillo@0 82 (a) += (b); \
meillo@0 83 }
meillo@0 84 #define HH(a, b, c, d, x, s, ac) { \
meillo@0 85 (a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
meillo@0 86 (a) = ROTATE_LEFT ((a), (s)); \
meillo@0 87 (a) += (b); \
meillo@0 88 }
meillo@0 89 #define II(a, b, c, d, x, s, ac) { \
meillo@0 90 (a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
meillo@0 91 (a) = ROTATE_LEFT ((a), (s)); \
meillo@0 92 (a) += (b); \
meillo@0 93 }
meillo@0 94
meillo@0 95 /* MD5 initialization. Begins an MD5 operation, writing a new context.
meillo@0 96 */
meillo@10 97 void
meillo@10 98 MD5Init(context)
meillo@10 99 MD5_CTX *context; /* context */
meillo@0 100 {
meillo@10 101 context->count[0] = context->count[1] = 0;
meillo@10 102 /* Load magic initialization constants. */
meillo@10 103 context->state[0] = 0x67452301;
meillo@10 104 context->state[1] = 0xefcdab89;
meillo@10 105 context->state[2] = 0x98badcfe;
meillo@10 106 context->state[3] = 0x10325476;
meillo@0 107 }
meillo@0 108
meillo@0 109 /* MD5 block update operation. Continues an MD5 message-digest
meillo@0 110 operation, processing another message block, and updating the
meillo@0 111 context.
meillo@0 112 */
meillo@10 113 void
meillo@10 114 MD5Update(context, input, inputLen)
meillo@10 115 MD5_CTX *context; /* context */
meillo@10 116 unsigned char *input; /* input block */
meillo@10 117 unsigned int inputLen; /* length of input block */
meillo@0 118 {
meillo@10 119 unsigned int i, index, partLen;
meillo@0 120
meillo@10 121 /* Compute number of bytes mod 64 */
meillo@10 122 index = (unsigned int) ((context->count[0] >> 3) & 0x3F);
meillo@0 123
meillo@10 124 /* Update number of bits */
meillo@10 125 if ((context->count[0] += ((UINT4) inputLen << 3)) < ((UINT4) inputLen << 3))
meillo@10 126 context->count[1]++;
meillo@10 127 context->count[1] += ((UINT4) inputLen >> 29);
meillo@0 128
meillo@10 129 partLen = 64 - index;
meillo@0 130
meillo@10 131 /* Transform as many times as possible.
meillo@10 132 */
meillo@10 133 if (inputLen >= partLen) {
meillo@10 134 MD5_memcpy((POINTER) & context->buffer[index], (POINTER) input, partLen);
meillo@10 135 MD5Transform(context->state, context->buffer);
meillo@0 136
meillo@10 137 for (i = partLen; i + 63 < inputLen; i += 64)
meillo@10 138 MD5Transform(context->state, &input[i]);
meillo@0 139
meillo@10 140 index = 0;
meillo@10 141 } else
meillo@10 142 i = 0;
meillo@0 143
meillo@10 144 /* Buffer remaining input */
meillo@10 145 MD5_memcpy((POINTER) & context->buffer[index], (POINTER) & input[i], inputLen - i);
meillo@0 146 }
meillo@0 147
meillo@0 148 /* MD5 finalization. Ends an MD5 message-digest operation, writing the
meillo@0 149 the message digest and zeroizing the context.
meillo@0 150 */
meillo@10 151 void
meillo@10 152 MD5Final(digest, context)
meillo@10 153 unsigned char digest[16]; /* message digest */
meillo@10 154 MD5_CTX *context; /* context */
meillo@0 155 {
meillo@10 156 unsigned char bits[8];
meillo@10 157 unsigned int index, padLen;
meillo@0 158
meillo@10 159 /* Save number of bits */
meillo@10 160 Encode(bits, context->count, 8);
meillo@0 161
meillo@10 162 /* Pad out to 56 mod 64.
meillo@10 163 */
meillo@10 164 index = (unsigned int) ((context->count[0] >> 3) & 0x3f);
meillo@10 165 padLen = (index < 56) ? (56 - index) : (120 - index);
meillo@10 166 MD5Update(context, PADDING, padLen);
meillo@0 167
meillo@10 168 /* Append length (before padding) */
meillo@10 169 MD5Update(context, bits, 8);
meillo@0 170
meillo@10 171 /* Store state in digest */
meillo@10 172 Encode(digest, context->state, 16);
meillo@0 173
meillo@10 174 /* Zeroize sensitive information.
meillo@10 175 */
meillo@10 176 MD5_memset((POINTER) context, 0, sizeof(*context));
meillo@0 177 }
meillo@0 178
meillo@0 179 /* MD5 basic transformation. Transforms state based on block.
meillo@0 180 */
meillo@10 181 static void
meillo@10 182 MD5Transform(state, block)
meillo@0 183 UINT4 state[4];
meillo@0 184 unsigned char block[64];
meillo@0 185 {
meillo@10 186 UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
meillo@0 187
meillo@10 188 Decode(x, block, 64);
meillo@0 189
meillo@10 190 /* Round 1 */
meillo@10 191 FF(a, b, c, d, x[0], S11, 0xd76aa478); /* 1 */
meillo@10 192 FF(d, a, b, c, x[1], S12, 0xe8c7b756); /* 2 */
meillo@10 193 FF(c, d, a, b, x[2], S13, 0x242070db); /* 3 */
meillo@10 194 FF(b, c, d, a, x[3], S14, 0xc1bdceee); /* 4 */
meillo@10 195 FF(a, b, c, d, x[4], S11, 0xf57c0faf); /* 5 */
meillo@10 196 FF(d, a, b, c, x[5], S12, 0x4787c62a); /* 6 */
meillo@10 197 FF(c, d, a, b, x[6], S13, 0xa8304613); /* 7 */
meillo@10 198 FF(b, c, d, a, x[7], S14, 0xfd469501); /* 8 */
meillo@10 199 FF(a, b, c, d, x[8], S11, 0x698098d8); /* 9 */
meillo@10 200 FF(d, a, b, c, x[9], S12, 0x8b44f7af); /* 10 */
meillo@10 201 FF(c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
meillo@10 202 FF(b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
meillo@10 203 FF(a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
meillo@10 204 FF(d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
meillo@10 205 FF(c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
meillo@10 206 FF(b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
meillo@0 207
meillo@10 208 /* Round 2 */
meillo@10 209 GG(a, b, c, d, x[1], S21, 0xf61e2562); /* 17 */
meillo@10 210 GG(d, a, b, c, x[6], S22, 0xc040b340); /* 18 */
meillo@10 211 GG(c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
meillo@10 212 GG(b, c, d, a, x[0], S24, 0xe9b6c7aa); /* 20 */
meillo@10 213 GG(a, b, c, d, x[5], S21, 0xd62f105d); /* 21 */
meillo@10 214 GG(d, a, b, c, x[10], S22, 0x2441453); /* 22 */
meillo@10 215 GG(c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
meillo@10 216 GG(b, c, d, a, x[4], S24, 0xe7d3fbc8); /* 24 */
meillo@10 217 GG(a, b, c, d, x[9], S21, 0x21e1cde6); /* 25 */
meillo@10 218 GG(d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
meillo@10 219 GG(c, d, a, b, x[3], S23, 0xf4d50d87); /* 27 */
meillo@10 220 GG(b, c, d, a, x[8], S24, 0x455a14ed); /* 28 */
meillo@10 221 GG(a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
meillo@10 222 GG(d, a, b, c, x[2], S22, 0xfcefa3f8); /* 30 */
meillo@10 223 GG(c, d, a, b, x[7], S23, 0x676f02d9); /* 31 */
meillo@10 224 GG(b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
meillo@0 225
meillo@10 226 /* Round 3 */
meillo@10 227 HH(a, b, c, d, x[5], S31, 0xfffa3942); /* 33 */
meillo@10 228 HH(d, a, b, c, x[8], S32, 0x8771f681); /* 34 */
meillo@10 229 HH(c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
meillo@10 230 HH(b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
meillo@10 231 HH(a, b, c, d, x[1], S31, 0xa4beea44); /* 37 */
meillo@10 232 HH(d, a, b, c, x[4], S32, 0x4bdecfa9); /* 38 */
meillo@10 233 HH(c, d, a, b, x[7], S33, 0xf6bb4b60); /* 39 */
meillo@10 234 HH(b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
meillo@10 235 HH(a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
meillo@10 236 HH(d, a, b, c, x[0], S32, 0xeaa127fa); /* 42 */
meillo@10 237 HH(c, d, a, b, x[3], S33, 0xd4ef3085); /* 43 */
meillo@10 238 HH(b, c, d, a, x[6], S34, 0x4881d05); /* 44 */
meillo@10 239 HH(a, b, c, d, x[9], S31, 0xd9d4d039); /* 45 */
meillo@10 240 HH(d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
meillo@10 241 HH(c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
meillo@10 242 HH(b, c, d, a, x[2], S34, 0xc4ac5665); /* 48 */
meillo@0 243
meillo@10 244 /* Round 4 */
meillo@10 245 II(a, b, c, d, x[0], S41, 0xf4292244); /* 49 */
meillo@10 246 II(d, a, b, c, x[7], S42, 0x432aff97); /* 50 */
meillo@10 247 II(c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
meillo@10 248 II(b, c, d, a, x[5], S44, 0xfc93a039); /* 52 */
meillo@10 249 II(a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
meillo@10 250 II(d, a, b, c, x[3], S42, 0x8f0ccc92); /* 54 */
meillo@10 251 II(c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
meillo@10 252 II(b, c, d, a, x[1], S44, 0x85845dd1); /* 56 */
meillo@10 253 II(a, b, c, d, x[8], S41, 0x6fa87e4f); /* 57 */
meillo@10 254 II(d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
meillo@10 255 II(c, d, a, b, x[6], S43, 0xa3014314); /* 59 */
meillo@10 256 II(b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
meillo@10 257 II(a, b, c, d, x[4], S41, 0xf7537e82); /* 61 */
meillo@10 258 II(d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
meillo@10 259 II(c, d, a, b, x[2], S43, 0x2ad7d2bb); /* 63 */
meillo@10 260 II(b, c, d, a, x[9], S44, 0xeb86d391); /* 64 */
meillo@0 261
meillo@10 262 state[0] += a;
meillo@10 263 state[1] += b;
meillo@10 264 state[2] += c;
meillo@10 265 state[3] += d;
meillo@0 266
meillo@10 267 /* Zeroize sensitive information. */
meillo@10 268 MD5_memset((POINTER) x, 0, sizeof(x));
meillo@0 269 }
meillo@0 270
meillo@0 271 /* Encodes input (UINT4) into output (unsigned char). Assumes len is
meillo@0 272 a multiple of 4.
meillo@0 273 */
meillo@10 274 static void
meillo@10 275 Encode(output, input, len)
meillo@0 276 unsigned char *output;
meillo@0 277 UINT4 *input;
meillo@0 278 unsigned int len;
meillo@0 279 {
meillo@10 280 unsigned int i, j;
meillo@0 281
meillo@10 282 for (i = 0, j = 0; j < len; i++, j += 4) {
meillo@10 283 output[j] = (unsigned char) (input[i] & 0xff);
meillo@10 284 output[j + 1] = (unsigned char) ((input[i] >> 8) & 0xff);
meillo@10 285 output[j + 2] = (unsigned char) ((input[i] >> 16) & 0xff);
meillo@10 286 output[j + 3] = (unsigned char) ((input[i] >> 24) & 0xff);
meillo@10 287 }
meillo@0 288 }
meillo@0 289
meillo@0 290 /* Decodes input (unsigned char) into output (UINT4). Assumes len is
meillo@0 291 a multiple of 4.
meillo@0 292 */
meillo@10 293 static void
meillo@10 294 Decode(output, input, len)
meillo@0 295 UINT4 *output;
meillo@0 296 unsigned char *input;
meillo@0 297 unsigned int len;
meillo@0 298 {
meillo@10 299 unsigned int i, j;
meillo@0 300
meillo@10 301 for (i = 0, j = 0; j < len; i++, j += 4)
meillo@10 302 output[i] = ((UINT4) input[j]) | (((UINT4) input[j + 1]) << 8) | (((UINT4) input[j + 2]) << 16) | (((UINT4) input[j + 3]) << 24);
meillo@0 303 }
meillo@0 304
meillo@0 305 /* Note: Replace "for loop" with standard memcpy if possible.
meillo@0 306 */
meillo@0 307
meillo@10 308 static void
meillo@10 309 MD5_memcpy(output, input, len)
meillo@0 310 POINTER output;
meillo@0 311 POINTER input;
meillo@0 312 unsigned int len;
meillo@0 313 {
meillo@10 314 unsigned int i;
meillo@0 315
meillo@10 316 for (i = 0; i < len; i++)
meillo@10 317 output[i] = input[i];
meillo@0 318 }
meillo@0 319
meillo@0 320 /* Note: Replace "for loop" with standard memset if possible.
meillo@0 321 */
meillo@10 322 static void
meillo@10 323 MD5_memset(output, value, len)
meillo@0 324 POINTER output;
meillo@0 325 int value;
meillo@0 326 unsigned int len;
meillo@0 327 {
meillo@10 328 unsigned int i;
meillo@0 329
meillo@10 330 for (i = 0; i < len; i++)
meillo@10 331 ((char *) output)[i] = (char) value;
meillo@0 332 }