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annotate src/md5/md5c.c @ 3:8c55886cacd8

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author meillo@marmaro.de
date Fri, 26 Sep 2008 21:40:10 +0200
parents
children 26e34ae9a3e3
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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@0 48 static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
meillo@0 49 static void Encode PROTO_LIST
meillo@0 50 ((unsigned char *, UINT4 *, unsigned int));
meillo@0 51 static void Decode PROTO_LIST
meillo@0 52 ((UINT4 *, unsigned char *, unsigned int));
meillo@0 53 static void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
meillo@0 54 static void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));
meillo@0 55
meillo@0 56 static unsigned char PADDING[64] = {
meillo@0 57 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
meillo@0 58 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
meillo@0 59 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
meillo@0 60 };
meillo@0 61
meillo@0 62 /* F, G, H and I are basic MD5 functions.
meillo@0 63 */
meillo@0 64 #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
meillo@0 65 #define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
meillo@0 66 #define H(x, y, z) ((x) ^ (y) ^ (z))
meillo@0 67 #define I(x, y, z) ((y) ^ ((x) | (~z)))
meillo@0 68
meillo@0 69 /* ROTATE_LEFT rotates x left n bits.
meillo@0 70 */
meillo@0 71 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
meillo@0 72
meillo@0 73 /* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
meillo@0 74 Rotation is separate from addition to prevent recomputation.
meillo@0 75 */
meillo@0 76 #define FF(a, b, c, d, x, s, ac) { \
meillo@0 77 (a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
meillo@0 78 (a) = ROTATE_LEFT ((a), (s)); \
meillo@0 79 (a) += (b); \
meillo@0 80 }
meillo@0 81 #define GG(a, b, c, d, x, s, ac) { \
meillo@0 82 (a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
meillo@0 83 (a) = ROTATE_LEFT ((a), (s)); \
meillo@0 84 (a) += (b); \
meillo@0 85 }
meillo@0 86 #define HH(a, b, c, d, x, s, ac) { \
meillo@0 87 (a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
meillo@0 88 (a) = ROTATE_LEFT ((a), (s)); \
meillo@0 89 (a) += (b); \
meillo@0 90 }
meillo@0 91 #define II(a, b, c, d, x, s, ac) { \
meillo@0 92 (a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
meillo@0 93 (a) = ROTATE_LEFT ((a), (s)); \
meillo@0 94 (a) += (b); \
meillo@0 95 }
meillo@0 96
meillo@0 97 /* MD5 initialization. Begins an MD5 operation, writing a new context.
meillo@0 98 */
meillo@0 99 void MD5Init (context)
meillo@0 100 MD5_CTX *context; /* context */
meillo@0 101 {
meillo@0 102 context->count[0] = context->count[1] = 0;
meillo@0 103 /* Load magic initialization constants.
meillo@0 104 */
meillo@0 105 context->state[0] = 0x67452301;
meillo@0 106 context->state[1] = 0xefcdab89;
meillo@0 107 context->state[2] = 0x98badcfe;
meillo@0 108 context->state[3] = 0x10325476;
meillo@0 109 }
meillo@0 110
meillo@0 111 /* MD5 block update operation. Continues an MD5 message-digest
meillo@0 112 operation, processing another message block, and updating the
meillo@0 113 context.
meillo@0 114 */
meillo@0 115 void MD5Update (context, input, inputLen)
meillo@0 116 MD5_CTX *context; /* context */
meillo@0 117 unsigned char *input; /* input block */
meillo@0 118 unsigned int inputLen; /* length of input block */
meillo@0 119 {
meillo@0 120 unsigned int i, index, partLen;
meillo@0 121
meillo@0 122 /* Compute number of bytes mod 64 */
meillo@0 123 index = (unsigned int)((context->count[0] >> 3) & 0x3F);
meillo@0 124
meillo@0 125 /* Update number of bits */
meillo@0 126 if ((context->count[0] += ((UINT4)inputLen << 3))
meillo@0 127 < ((UINT4)inputLen << 3))
meillo@0 128 context->count[1]++;
meillo@0 129 context->count[1] += ((UINT4)inputLen >> 29);
meillo@0 130
meillo@0 131 partLen = 64 - index;
meillo@0 132
meillo@0 133 /* Transform as many times as possible.
meillo@0 134 */
meillo@0 135 if (inputLen >= partLen) {
meillo@0 136 MD5_memcpy
meillo@0 137 ((POINTER)&context->buffer[index], (POINTER)input, partLen);
meillo@0 138 MD5Transform (context->state, context->buffer);
meillo@0 139
meillo@0 140 for (i = partLen; i + 63 < inputLen; i += 64)
meillo@0 141 MD5Transform (context->state, &input[i]);
meillo@0 142
meillo@0 143 index = 0;
meillo@0 144 }
meillo@0 145 else
meillo@0 146 i = 0;
meillo@0 147
meillo@0 148 /* Buffer remaining input */
meillo@0 149 MD5_memcpy
meillo@0 150 ((POINTER)&context->buffer[index], (POINTER)&input[i],
meillo@0 151 inputLen-i);
meillo@0 152 }
meillo@0 153
meillo@0 154 /* MD5 finalization. Ends an MD5 message-digest operation, writing the
meillo@0 155 the message digest and zeroizing the context.
meillo@0 156 */
meillo@0 157 void MD5Final (digest, context)
meillo@0 158 unsigned char digest[16]; /* message digest */
meillo@0 159 MD5_CTX *context; /* context */
meillo@0 160 {
meillo@0 161 unsigned char bits[8];
meillo@0 162 unsigned int index, padLen;
meillo@0 163
meillo@0 164 /* Save number of bits */
meillo@0 165 Encode (bits, context->count, 8);
meillo@0 166
meillo@0 167 /* Pad out to 56 mod 64.
meillo@0 168 */
meillo@0 169 index = (unsigned int)((context->count[0] >> 3) & 0x3f);
meillo@0 170 padLen = (index < 56) ? (56 - index) : (120 - index);
meillo@0 171 MD5Update (context, PADDING, padLen);
meillo@0 172
meillo@0 173 /* Append length (before padding) */
meillo@0 174 MD5Update (context, bits, 8);
meillo@0 175
meillo@0 176 /* Store state in digest */
meillo@0 177 Encode (digest, context->state, 16);
meillo@0 178
meillo@0 179 /* Zeroize sensitive information.
meillo@0 180 */
meillo@0 181 MD5_memset ((POINTER)context, 0, sizeof (*context));
meillo@0 182 }
meillo@0 183
meillo@0 184 /* MD5 basic transformation. Transforms state based on block.
meillo@0 185 */
meillo@0 186 static void MD5Transform (state, block)
meillo@0 187 UINT4 state[4];
meillo@0 188 unsigned char block[64];
meillo@0 189 {
meillo@0 190 UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
meillo@0 191
meillo@0 192 Decode (x, block, 64);
meillo@0 193
meillo@0 194 /* Round 1 */
meillo@0 195 FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
meillo@0 196 FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
meillo@0 197 FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
meillo@0 198 FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
meillo@0 199 FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
meillo@0 200 FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
meillo@0 201 FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
meillo@0 202 FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
meillo@0 203 FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
meillo@0 204 FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
meillo@0 205 FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
meillo@0 206 FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
meillo@0 207 FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
meillo@0 208 FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
meillo@0 209 FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
meillo@0 210 FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
meillo@0 211
meillo@0 212 /* Round 2 */
meillo@0 213 GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
meillo@0 214 GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
meillo@0 215 GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
meillo@0 216 GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
meillo@0 217 GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
meillo@0 218 GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */
meillo@0 219 GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
meillo@0 220 GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
meillo@0 221 GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
meillo@0 222 GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
meillo@0 223 GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
meillo@0 224 GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
meillo@0 225 GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
meillo@0 226 GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
meillo@0 227 GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
meillo@0 228 GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
meillo@0 229
meillo@0 230 /* Round 3 */
meillo@0 231 HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
meillo@0 232 HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
meillo@0 233 HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
meillo@0 234 HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
meillo@0 235 HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
meillo@0 236 HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
meillo@0 237 HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
meillo@0 238 HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
meillo@0 239 HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
meillo@0 240 HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
meillo@0 241 HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
meillo@0 242 HH (b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */
meillo@0 243 HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
meillo@0 244 HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
meillo@0 245 HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
meillo@0 246 HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */
meillo@0 247
meillo@0 248 /* Round 4 */
meillo@0 249 II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
meillo@0 250 II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
meillo@0 251 II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
meillo@0 252 II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
meillo@0 253 II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
meillo@0 254 II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
meillo@0 255 II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
meillo@0 256 II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
meillo@0 257 II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
meillo@0 258 II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
meillo@0 259 II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
meillo@0 260 II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
meillo@0 261 II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
meillo@0 262 II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
meillo@0 263 II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
meillo@0 264 II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */
meillo@0 265
meillo@0 266 state[0] += a;
meillo@0 267 state[1] += b;
meillo@0 268 state[2] += c;
meillo@0 269 state[3] += d;
meillo@0 270
meillo@0 271 /* Zeroize sensitive information.
meillo@0 272 */
meillo@0 273 MD5_memset ((POINTER)x, 0, sizeof (x));
meillo@0 274 }
meillo@0 275
meillo@0 276 /* Encodes input (UINT4) into output (unsigned char). Assumes len is
meillo@0 277 a multiple of 4.
meillo@0 278 */
meillo@0 279 static void Encode (output, input, len)
meillo@0 280 unsigned char *output;
meillo@0 281 UINT4 *input;
meillo@0 282 unsigned int len;
meillo@0 283 {
meillo@0 284 unsigned int i, j;
meillo@0 285
meillo@0 286 for (i = 0, j = 0; j < len; i++, j += 4) {
meillo@0 287 output[j] = (unsigned char)(input[i] & 0xff);
meillo@0 288 output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
meillo@0 289 output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
meillo@0 290 output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
meillo@0 291 }
meillo@0 292 }
meillo@0 293
meillo@0 294 /* Decodes input (unsigned char) into output (UINT4). Assumes len is
meillo@0 295 a multiple of 4.
meillo@0 296 */
meillo@0 297 static void Decode (output, input, len)
meillo@0 298 UINT4 *output;
meillo@0 299 unsigned char *input;
meillo@0 300 unsigned int len;
meillo@0 301 {
meillo@0 302 unsigned int i, j;
meillo@0 303
meillo@0 304 for (i = 0, j = 0; j < len; i++, j += 4)
meillo@0 305 output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) |
meillo@0 306 (((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24);
meillo@0 307 }
meillo@0 308
meillo@0 309 /* Note: Replace "for loop" with standard memcpy if possible.
meillo@0 310 */
meillo@0 311
meillo@0 312 static void MD5_memcpy (output, input, len)
meillo@0 313 POINTER output;
meillo@0 314 POINTER input;
meillo@0 315 unsigned int len;
meillo@0 316 {
meillo@0 317 unsigned int i;
meillo@0 318
meillo@0 319 for (i = 0; i < len; i++)
meillo@0 320 output[i] = input[i];
meillo@0 321 }
meillo@0 322
meillo@0 323 /* Note: Replace "for loop" with standard memset if possible.
meillo@0 324 */
meillo@0 325 static void MD5_memset (output, value, len)
meillo@0 326 POINTER output;
meillo@0 327 int value;
meillo@0 328 unsigned int len;
meillo@0 329 {
meillo@0 330 unsigned int i;
meillo@0 331
meillo@0 332 for (i = 0; i < len; i++)
meillo@0 333 ((char *)output)[i] = (char)value;
meillo@0 334 }