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 * This code is the same as the code published by RSA Inc. It has been 26 * edited for clarity and style only. 27 */ 28 29 /* 30 * This file should be kept in sync with src/lib/libmd/md5c.c 31 */ 32 #include <sys/cdefs.h> 33 __FBSDID("$FreeBSD$"); 34 35 #include <sys/types.h> 36 37 #ifdef _KERNEL 38 #include <sys/systm.h> 39 #else 40 #include <string.h> 41 #endif 42 43 #include <machine/endian.h> 44 #include <sys/endian.h> 45 #include <sys/md5.h> 46 47 static void MD5Transform(u_int32_t [4], const unsigned char [64]); 48 49 #if (BYTE_ORDER == LITTLE_ENDIAN) 50 #define Encode memcpy 51 #define Decode memcpy 52 #else 53 54 /* 55 * Encodes input (u_int32_t) into output (unsigned char). Assumes len is 56 * a multiple of 4. 57 */ 58 59 static void 60 Encode (unsigned char *output, u_int32_t *input, unsigned int len) 61 { 62 unsigned int i; 63 uint32_t ip; 64 65 for (i = 0; i < len / 4; i++) { 66 ip = input[i]; 67 *output++ = ip; 68 *output++ = ip >> 8; 69 *output++ = ip >> 16; 70 *output++ = ip >> 24; 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 (u_int32_t *output, const unsigned char *input, unsigned int len) 81 { 82 unsigned int i; 83 84 for (i = 0; i < len; i += 4) { 85 *output++ = input[i] | (input[i+1] << 8) | (input[i+2] << 16) | 86 (input[i+3] << 24); 87 } 88 } 89 #endif 90 91 static unsigned char PADDING[64] = { 92 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 93 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 94 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 95 }; 96 97 /* F, G, H and I are basic MD5 functions. */ 98 #define F(x, y, z) (((x) & (y)) | ((~x) & (z))) 99 #define G(x, y, z) (((x) & (z)) | ((y) & (~z))) 100 #define H(x, y, z) ((x) ^ (y) ^ (z)) 101 #define I(x, y, z) ((y) ^ ((x) | (~z))) 102 103 /* ROTATE_LEFT rotates x left n bits. */ 104 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n)))) 105 106 /* 107 * FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4. 108 * Rotation is separate from addition to prevent recomputation. 109 */ 110 #define FF(a, b, c, d, x, s, ac) { \ 111 (a) += F ((b), (c), (d)) + (x) + (u_int32_t)(ac); \ 112 (a) = ROTATE_LEFT ((a), (s)); \ 113 (a) += (b); \ 114 } 115 #define GG(a, b, c, d, x, s, ac) { \ 116 (a) += G ((b), (c), (d)) + (x) + (u_int32_t)(ac); \ 117 (a) = ROTATE_LEFT ((a), (s)); \ 118 (a) += (b); \ 119 } 120 #define HH(a, b, c, d, x, s, ac) { \ 121 (a) += H ((b), (c), (d)) + (x) + (u_int32_t)(ac); \ 122 (a) = ROTATE_LEFT ((a), (s)); \ 123 (a) += (b); \ 124 } 125 #define II(a, b, c, d, x, s, ac) { \ 126 (a) += I ((b), (c), (d)) + (x) + (u_int32_t)(ac); \ 127 (a) = ROTATE_LEFT ((a), (s)); \ 128 (a) += (b); \ 129 } 130 131 /* MD5 initialization. Begins an MD5 operation, writing a new context. */ 132 133 void 134 MD5Init (context) 135 MD5_CTX *context; 136 { 137 138 context->count[0] = context->count[1] = 0; 139 140 /* Load magic initialization constants. */ 141 context->state[0] = 0x67452301; 142 context->state[1] = 0xefcdab89; 143 context->state[2] = 0x98badcfe; 144 context->state[3] = 0x10325476; 145 } 146 147 /* 148 * MD5 block update operation. Continues an MD5 message-digest 149 * operation, processing another message block, and updating the 150 * context. 151 */ 152 153 void 154 MD5Update (context, in, inputLen) 155 MD5_CTX *context; 156 const void *in; 157 unsigned int inputLen; 158 { 159 unsigned int i, index, partLen; 160 const unsigned char *input = in; 161 162 /* Compute number of bytes mod 64 */ 163 index = (unsigned int)((context->count[0] >> 3) & 0x3F); 164 165 /* Update number of bits */ 166 if ((context->count[0] += ((u_int32_t)inputLen << 3)) 167 < ((u_int32_t)inputLen << 3)) 168 context->count[1]++; 169 context->count[1] += ((u_int32_t)inputLen >> 29); 170 171 partLen = 64 - index; 172 173 /* Transform as many times as possible. */ 174 if (inputLen >= partLen) { 175 memcpy((void *)&context->buffer[index], (const void *)input, 176 partLen); 177 MD5Transform (context->state, context->buffer); 178 179 for (i = partLen; i + 63 < inputLen; i += 64) 180 MD5Transform (context->state, &input[i]); 181 182 index = 0; 183 } 184 else 185 i = 0; 186 187 /* Buffer remaining input */ 188 memcpy ((void *)&context->buffer[index], (const void *)&input[i], 189 inputLen-i); 190 } 191 192 /* 193 * MD5 padding. Adds padding followed by original length. 194 */ 195 196 static void 197 MD5Pad (MD5_CTX *context) 198 { 199 unsigned char bits[8]; 200 unsigned int index, padLen; 201 202 /* Save number of bits */ 203 Encode (bits, context->count, 8); 204 205 /* Pad out to 56 mod 64. */ 206 index = (unsigned int)((context->count[0] >> 3) & 0x3f); 207 padLen = (index < 56) ? (56 - index) : (120 - index); 208 MD5Update (context, PADDING, padLen); 209 210 /* Append length (before padding) */ 211 MD5Update (context, bits, 8); 212 } 213 214 /* 215 * MD5 finalization. Ends an MD5 message-digest operation, writing the 216 * the message digest and zeroizing the context. 217 */ 218 219 void 220 MD5Final(unsigned char digest[static MD5_DIGEST_LENGTH], MD5_CTX *context) 221 { 222 /* Do padding. */ 223 MD5Pad (context); 224 225 /* Store state in digest */ 226 Encode (digest, context->state, MD5_DIGEST_LENGTH); 227 228 /* Zeroize sensitive information. */ 229 memset (context, 0, sizeof (*context)); 230 } 231 232 /* MD5 basic transformation. Transforms state based on block. */ 233 234 static void 235 MD5Transform (state, block) 236 u_int32_t state[4]; 237 const unsigned char block[64]; 238 { 239 u_int32_t a = state[0], b = state[1], c = state[2], d = state[3], x[16]; 240 241 Decode (x, block, 64); 242 243 /* Round 1 */ 244 #define S11 7 245 #define S12 12 246 #define S13 17 247 #define S14 22 248 FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */ 249 FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */ 250 FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */ 251 FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */ 252 FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */ 253 FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */ 254 FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */ 255 FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */ 256 FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */ 257 FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */ 258 FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */ 259 FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */ 260 FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */ 261 FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */ 262 FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */ 263 FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */ 264 265 /* Round 2 */ 266 #define S21 5 267 #define S22 9 268 #define S23 14 269 #define S24 20 270 GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */ 271 GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */ 272 GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */ 273 GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */ 274 GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */ 275 GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */ 276 GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */ 277 GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */ 278 GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */ 279 GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */ 280 GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */ 281 GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */ 282 GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */ 283 GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */ 284 GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */ 285 GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */ 286 287 /* Round 3 */ 288 #define S31 4 289 #define S32 11 290 #define S33 16 291 #define S34 23 292 HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */ 293 HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */ 294 HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */ 295 HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */ 296 HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */ 297 HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */ 298 HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */ 299 HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */ 300 HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */ 301 HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */ 302 HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */ 303 HH (b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */ 304 HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */ 305 HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */ 306 HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */ 307 HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */ 308 309 /* Round 4 */ 310 #define S41 6 311 #define S42 10 312 #define S43 15 313 #define S44 21 314 II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */ 315 II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */ 316 II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */ 317 II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */ 318 II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */ 319 II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */ 320 II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */ 321 II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */ 322 II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */ 323 II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */ 324 II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */ 325 II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */ 326 II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */ 327 II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */ 328 II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */ 329 II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */ 330 331 state[0] += a; 332 state[1] += b; 333 state[2] += c; 334 state[3] += d; 335 336 /* Zeroize sensitive information. */ 337 memset ((void *)x, 0, sizeof (x)); 338 } 339