1 /* 2 * MD5C.C - RSA Data Security, Inc., MD5 message-digest algorithm 3 * 4 * Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All 5 * rights reserved. 6 * 7 * License to copy and use this software is granted provided that it 8 * is identified as the "RSA Data Security, Inc. MD5 Message-Digest 9 * Algorithm" in all material mentioning or referencing this software 10 * or this function. 11 * 12 * License is also granted to make and use derivative works provided 13 * that such works are identified as "derived from the RSA Data 14 * Security, Inc. MD5 Message-Digest Algorithm" in all material 15 * mentioning or referencing the derived work. 16 * 17 * RSA Data Security, Inc. makes no representations concerning either 18 * the merchantability of this software or the suitability of this 19 * software for any particular purpose. It is provided "as is" 20 * without express or implied warranty of any kind. 21 * 22 * These notices must be retained in any copies of any part of this 23 * documentation and/or software. 24 * 25 * $Id: md5c.c,v 1.14 1998/05/01 16:40:19 bde Exp $ 26 * 27 * This code is the same as the code published by RSA Inc. It has been 28 * edited for clarity and style only. 29 */ 30 31 #include <sys/types.h> 32 33 #ifdef KERNEL 34 #include <sys/systm.h> 35 #else 36 #include <string.h> 37 #endif 38 39 #include <sys/md5.h> 40 41 42 #ifdef KERNEL 43 #define memset(x,y,z) bzero(x,z); 44 #define memcpy(x,y,z) bcopy(y, x, z) 45 #endif 46 47 #if defined(__i386__) || defined(__alpha__) 48 #define Encode memcpy 49 #define Decode memcpy 50 #else /* __i386__ */ 51 52 /* 53 * Encodes input (u_int32_t) into output (unsigned char). Assumes len is 54 * a multiple of 4. 55 */ 56 57 /* XXX not prototyped, and not compatible with memcpy(). */ 58 static void 59 Encode (output, input, len) 60 unsigned char *output; 61 u_int32_t *input; 62 unsigned int len; 63 { 64 unsigned int i, j; 65 66 for (i = 0, j = 0; j < len; i++, j += 4) { 67 output[j] = (unsigned char)(input[i] & 0xff); 68 output[j+1] = (unsigned char)((input[i] >> 8) & 0xff); 69 output[j+2] = (unsigned char)((input[i] >> 16) & 0xff); 70 output[j+3] = (unsigned char)((input[i] >> 24) & 0xff); 71 } 72 } 73 74 /* 75 * Decodes input (unsigned char) into output (u_int32_t). Assumes len is 76 * a multiple of 4. 77 */ 78 79 static void 80 Decode (output, input, len) 81 u_int32_t *output; 82 const unsigned char *input; 83 unsigned int len; 84 { 85 unsigned int i, j; 86 87 for (i = 0, j = 0; j < len; i++, j += 4) 88 output[i] = ((u_int32_t)input[j]) | (((u_int32_t)input[j+1]) << 8) | 89 (((u_int32_t)input[j+2]) << 16) | (((u_int32_t)input[j+3]) << 24); 90 } 91 #endif /* i386 */ 92 93 static unsigned char PADDING[64] = { 94 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 95 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 96 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 97 }; 98 99 /* F, G, H and I are basic MD5 functions. */ 100 #define F(x, y, z) (((x) & (y)) | ((~x) & (z))) 101 #define G(x, y, z) (((x) & (z)) | ((y) & (~z))) 102 #define H(x, y, z) ((x) ^ (y) ^ (z)) 103 #define I(x, y, z) ((y) ^ ((x) | (~z))) 104 105 /* ROTATE_LEFT rotates x left n bits. */ 106 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n)))) 107 108 /* 109 * FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4. 110 * Rotation is separate from addition to prevent recomputation. 111 */ 112 #define FF(a, b, c, d, x, s, ac) { \ 113 (a) += F ((b), (c), (d)) + (x) + (u_int32_t)(ac); \ 114 (a) = ROTATE_LEFT ((a), (s)); \ 115 (a) += (b); \ 116 } 117 #define GG(a, b, c, d, x, s, ac) { \ 118 (a) += G ((b), (c), (d)) + (x) + (u_int32_t)(ac); \ 119 (a) = ROTATE_LEFT ((a), (s)); \ 120 (a) += (b); \ 121 } 122 #define HH(a, b, c, d, x, s, ac) { \ 123 (a) += H ((b), (c), (d)) + (x) + (u_int32_t)(ac); \ 124 (a) = ROTATE_LEFT ((a), (s)); \ 125 (a) += (b); \ 126 } 127 #define II(a, b, c, d, x, s, ac) { \ 128 (a) += I ((b), (c), (d)) + (x) + (u_int32_t)(ac); \ 129 (a) = ROTATE_LEFT ((a), (s)); \ 130 (a) += (b); \ 131 } 132 133 /* MD5 initialization. Begins an MD5 operation, writing a new context. */ 134 135 void 136 MD5Init (context) 137 MD5_CTX *context; 138 { 139 140 context->count[0] = context->count[1] = 0; 141 142 /* Load magic initialization constants. */ 143 context->state[0] = 0x67452301; 144 context->state[1] = 0xefcdab89; 145 context->state[2] = 0x98badcfe; 146 context->state[3] = 0x10325476; 147 } 148 149 /* 150 * MD5 block update operation. Continues an MD5 message-digest 151 * operation, processing another message block, and updating the 152 * context. 153 */ 154 155 void 156 MD5Update (context, input, inputLen) 157 MD5_CTX *context; 158 const unsigned char *input; 159 unsigned int inputLen; 160 { 161 unsigned int i, index, partLen; 162 163 /* Compute number of bytes mod 64 */ 164 index = (unsigned int)((context->count[0] >> 3) & 0x3F); 165 166 /* Update number of bits */ 167 if ((context->count[0] += ((u_int32_t)inputLen << 3)) 168 < ((u_int32_t)inputLen << 3)) 169 context->count[1]++; 170 context->count[1] += ((u_int32_t)inputLen >> 29); 171 172 partLen = 64 - index; 173 174 /* Transform as many times as possible. */ 175 if (inputLen >= partLen) { 176 memcpy((void *)&context->buffer[index], (const void *)input, 177 partLen); 178 MD5Transform (context->state, context->buffer); 179 180 for (i = partLen; i + 63 < inputLen; i += 64) 181 MD5Transform (context->state, &input[i]); 182 183 index = 0; 184 } 185 else 186 i = 0; 187 188 /* Buffer remaining input */ 189 memcpy ((void *)&context->buffer[index], (const void *)&input[i], 190 inputLen-i); 191 } 192 193 /* 194 * MD5 padding. Adds padding followed by original length. 195 */ 196 197 void 198 MD5Pad (context) 199 MD5_CTX *context; 200 { 201 unsigned char bits[8]; 202 unsigned int index, padLen; 203 204 /* Save number of bits */ 205 Encode (bits, context->count, 8); 206 207 /* Pad out to 56 mod 64. */ 208 index = (unsigned int)((context->count[0] >> 3) & 0x3f); 209 padLen = (index < 56) ? (56 - index) : (120 - index); 210 MD5Update (context, PADDING, padLen); 211 212 /* Append length (before padding) */ 213 MD5Update (context, bits, 8); 214 } 215 216 /* 217 * MD5 finalization. Ends an MD5 message-digest operation, writing the 218 * the message digest and zeroizing the context. 219 */ 220 221 void 222 MD5Final (digest, context) 223 unsigned char digest[16]; 224 MD5_CTX *context; 225 { 226 /* Do padding. */ 227 MD5Pad (context); 228 229 /* Store state in digest */ 230 Encode (digest, context->state, 16); 231 232 /* Zeroize sensitive information. */ 233 memset ((void *)context, 0, sizeof (*context)); 234 } 235 236 /* MD5 basic transformation. Transforms state based on block. */ 237 238 void 239 MD5Transform (state, block) 240 u_int32_t state[4]; 241 const unsigned char block[64]; 242 { 243 u_int32_t a = state[0], b = state[1], c = state[2], d = state[3], x[16]; 244 245 Decode (x, block, 64); 246 247 /* Round 1 */ 248 #define S11 7 249 #define S12 12 250 #define S13 17 251 #define S14 22 252 FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */ 253 FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */ 254 FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */ 255 FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */ 256 FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */ 257 FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */ 258 FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */ 259 FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */ 260 FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */ 261 FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */ 262 FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */ 263 FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */ 264 FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */ 265 FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */ 266 FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */ 267 FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */ 268 269 /* Round 2 */ 270 #define S21 5 271 #define S22 9 272 #define S23 14 273 #define S24 20 274 GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */ 275 GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */ 276 GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */ 277 GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */ 278 GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */ 279 GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */ 280 GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */ 281 GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */ 282 GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */ 283 GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */ 284 GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */ 285 GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */ 286 GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */ 287 GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */ 288 GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */ 289 GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */ 290 291 /* Round 3 */ 292 #define S31 4 293 #define S32 11 294 #define S33 16 295 #define S34 23 296 HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */ 297 HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */ 298 HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */ 299 HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */ 300 HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */ 301 HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */ 302 HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */ 303 HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */ 304 HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */ 305 HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */ 306 HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */ 307 HH (b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */ 308 HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */ 309 HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */ 310 HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */ 311 HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */ 312 313 /* Round 4 */ 314 #define S41 6 315 #define S42 10 316 #define S43 15 317 #define S44 21 318 II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */ 319 II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */ 320 II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */ 321 II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */ 322 II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */ 323 II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */ 324 II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */ 325 II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */ 326 II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */ 327 II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */ 328 II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */ 329 II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */ 330 II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */ 331 II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */ 332 II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */ 333 II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */ 334 335 state[0] += a; 336 state[1] += b; 337 state[2] += c; 338 state[3] += d; 339 340 /* Zeroize sensitive information. */ 341 memset ((void *)x, 0, sizeof (x)); 342 } 343