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 u_int32_t *op = (u_int32_t *)output; 64 65 for (i = 0; i < len / 4; i++) 66 op[i] = htole32(input[i]); 67 } 68 69 /* 70 * Decodes input (unsigned char) into output (u_int32_t). Assumes len is 71 * a multiple of 4. 72 */ 73 74 static void 75 Decode (u_int32_t *output, const unsigned char *input, unsigned int len) 76 { 77 unsigned int i; 78 const u_int32_t *ip = (const u_int32_t *)input; 79 80 for (i = 0; i < len / 4; i++) 81 output[i] = le32dec(&ip[i]); 82 } 83 #endif 84 85 static unsigned char PADDING[64] = { 86 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 87 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 88 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 89 }; 90 91 /* F, G, H and I are basic MD5 functions. */ 92 #define F(x, y, z) (((x) & (y)) | ((~x) & (z))) 93 #define G(x, y, z) (((x) & (z)) | ((y) & (~z))) 94 #define H(x, y, z) ((x) ^ (y) ^ (z)) 95 #define I(x, y, z) ((y) ^ ((x) | (~z))) 96 97 /* ROTATE_LEFT rotates x left n bits. */ 98 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n)))) 99 100 /* 101 * FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4. 102 * Rotation is separate from addition to prevent recomputation. 103 */ 104 #define FF(a, b, c, d, x, s, ac) { \ 105 (a) += F ((b), (c), (d)) + (x) + (u_int32_t)(ac); \ 106 (a) = ROTATE_LEFT ((a), (s)); \ 107 (a) += (b); \ 108 } 109 #define GG(a, b, c, d, x, s, ac) { \ 110 (a) += G ((b), (c), (d)) + (x) + (u_int32_t)(ac); \ 111 (a) = ROTATE_LEFT ((a), (s)); \ 112 (a) += (b); \ 113 } 114 #define HH(a, b, c, d, x, s, ac) { \ 115 (a) += H ((b), (c), (d)) + (x) + (u_int32_t)(ac); \ 116 (a) = ROTATE_LEFT ((a), (s)); \ 117 (a) += (b); \ 118 } 119 #define II(a, b, c, d, x, s, ac) { \ 120 (a) += I ((b), (c), (d)) + (x) + (u_int32_t)(ac); \ 121 (a) = ROTATE_LEFT ((a), (s)); \ 122 (a) += (b); \ 123 } 124 125 /* MD5 initialization. Begins an MD5 operation, writing a new context. */ 126 127 void 128 MD5Init (context) 129 MD5_CTX *context; 130 { 131 132 context->count[0] = context->count[1] = 0; 133 134 /* Load magic initialization constants. */ 135 context->state[0] = 0x67452301; 136 context->state[1] = 0xefcdab89; 137 context->state[2] = 0x98badcfe; 138 context->state[3] = 0x10325476; 139 } 140 141 /* 142 * MD5 block update operation. Continues an MD5 message-digest 143 * operation, processing another message block, and updating the 144 * context. 145 */ 146 147 void 148 MD5Update (context, input, inputLen) 149 MD5_CTX *context; 150 const unsigned char *input; 151 unsigned int inputLen; 152 { 153 unsigned int i, index, partLen; 154 155 /* Compute number of bytes mod 64 */ 156 index = (unsigned int)((context->count[0] >> 3) & 0x3F); 157 158 /* Update number of bits */ 159 if ((context->count[0] += ((u_int32_t)inputLen << 3)) 160 < ((u_int32_t)inputLen << 3)) 161 context->count[1]++; 162 context->count[1] += ((u_int32_t)inputLen >> 29); 163 164 partLen = 64 - index; 165 166 /* Transform as many times as possible. */ 167 if (inputLen >= partLen) { 168 memcpy((void *)&context->buffer[index], (const void *)input, 169 partLen); 170 MD5Transform (context->state, context->buffer); 171 172 for (i = partLen; i + 63 < inputLen; i += 64) 173 MD5Transform (context->state, &input[i]); 174 175 index = 0; 176 } 177 else 178 i = 0; 179 180 /* Buffer remaining input */ 181 memcpy ((void *)&context->buffer[index], (const void *)&input[i], 182 inputLen-i); 183 } 184 185 /* 186 * MD5 padding. Adds padding followed by original length. 187 */ 188 189 void 190 MD5Pad (context) 191 MD5_CTX *context; 192 { 193 unsigned char bits[8]; 194 unsigned int index, padLen; 195 196 /* Save number of bits */ 197 Encode (bits, context->count, 8); 198 199 /* Pad out to 56 mod 64. */ 200 index = (unsigned int)((context->count[0] >> 3) & 0x3f); 201 padLen = (index < 56) ? (56 - index) : (120 - index); 202 MD5Update (context, PADDING, padLen); 203 204 /* Append length (before padding) */ 205 MD5Update (context, bits, 8); 206 } 207 208 /* 209 * MD5 finalization. Ends an MD5 message-digest operation, writing the 210 * the message digest and zeroizing the context. 211 */ 212 213 void 214 MD5Final (digest, context) 215 unsigned char digest[16]; 216 MD5_CTX *context; 217 { 218 /* Do padding. */ 219 MD5Pad (context); 220 221 /* Store state in digest */ 222 Encode (digest, context->state, 16); 223 224 /* Zeroize sensitive information. */ 225 memset ((void *)context, 0, sizeof (*context)); 226 } 227 228 /* MD5 basic transformation. Transforms state based on block. */ 229 230 static void 231 MD5Transform (state, block) 232 u_int32_t state[4]; 233 const unsigned char block[64]; 234 { 235 u_int32_t a = state[0], b = state[1], c = state[2], d = state[3], x[16]; 236 237 Decode (x, block, 64); 238 239 /* Round 1 */ 240 #define S11 7 241 #define S12 12 242 #define S13 17 243 #define S14 22 244 FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */ 245 FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */ 246 FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */ 247 FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */ 248 FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */ 249 FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */ 250 FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */ 251 FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */ 252 FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */ 253 FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */ 254 FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */ 255 FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */ 256 FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */ 257 FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */ 258 FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */ 259 FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */ 260 261 /* Round 2 */ 262 #define S21 5 263 #define S22 9 264 #define S23 14 265 #define S24 20 266 GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */ 267 GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */ 268 GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */ 269 GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */ 270 GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */ 271 GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */ 272 GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */ 273 GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */ 274 GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */ 275 GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */ 276 GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */ 277 GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */ 278 GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */ 279 GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */ 280 GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */ 281 GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */ 282 283 /* Round 3 */ 284 #define S31 4 285 #define S32 11 286 #define S33 16 287 #define S34 23 288 HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */ 289 HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */ 290 HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */ 291 HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */ 292 HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */ 293 HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */ 294 HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */ 295 HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */ 296 HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */ 297 HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */ 298 HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */ 299 HH (b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */ 300 HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */ 301 HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */ 302 HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */ 303 HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */ 304 305 /* Round 4 */ 306 #define S41 6 307 #define S42 10 308 #define S43 15 309 #define S44 21 310 II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */ 311 II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */ 312 II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */ 313 II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */ 314 II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */ 315 II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */ 316 II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */ 317 II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */ 318 II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */ 319 II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */ 320 II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */ 321 II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */ 322 II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */ 323 II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */ 324 II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */ 325 II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */ 326 327 state[0] += a; 328 state[1] += b; 329 state[2] += c; 330 state[3] += d; 331 332 /* Zeroize sensitive information. */ 333 memset ((void *)x, 0, sizeof (x)); 334 } 335