md5c.c revision 34944
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 1.11 1998/03/27 10:23:00 phk 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#ifdef i386 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 57static void 58Encode (output, input, len) 59 unsigned char *output; 60 u_int32_t *input; 61 unsigned int len; 62{ 63 unsigned int i, j; 64 65 for (i = 0, j = 0; j < len; i++, j += 4) { 66 output[j] = (unsigned char)(input[i] & 0xff); 67 output[j+1] = (unsigned char)((input[i] >> 8) & 0xff); 68 output[j+2] = (unsigned char)((input[i] >> 16) & 0xff); 69 output[j+3] = (unsigned char)((input[i] >> 24) & 0xff); 70 } 71} 72 73/* 74 * Decodes input (unsigned char) into output (u_int32_t). Assumes len is 75 * a multiple of 4. 76 */ 77 78static void 79Decode (output, input, len) 80 u_int32_t *output; 81 const unsigned char *input; 82 unsigned int len; 83{ 84 unsigned int i, j; 85 86 for (i = 0, j = 0; j < len; i++, j += 4) 87 output[i] = ((u_int32_t)input[j]) | (((u_int32_t)input[j+1]) << 8) | 88 (((u_int32_t)input[j+2]) << 16) | (((u_int32_t)input[j+3]) << 24); 89} 90#endif /* i386 */ 91 92static unsigned char PADDING[64] = { 93 0x80, 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, 0, 0, 0, 0, 95 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 96}; 97 98/* F, G, H and I are basic MD5 functions. */ 99#define F(x, y, z) (((x) & (y)) | ((~x) & (z))) 100#define G(x, y, z) (((x) & (z)) | ((y) & (~z))) 101#define H(x, y, z) ((x) ^ (y) ^ (z)) 102#define I(x, y, z) ((y) ^ ((x) | (~z))) 103 104/* ROTATE_LEFT rotates x left n bits. */ 105#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n)))) 106 107/* 108 * FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4. 109 * Rotation is separate from addition to prevent recomputation. 110 */ 111#define FF(a, b, c, d, x, s, ac) { \ 112 (a) += F ((b), (c), (d)) + (x) + (u_int32_t)(ac); \ 113 (a) = ROTATE_LEFT ((a), (s)); \ 114 (a) += (b); \ 115 } 116#define GG(a, b, c, d, x, s, ac) { \ 117 (a) += G ((b), (c), (d)) + (x) + (u_int32_t)(ac); \ 118 (a) = ROTATE_LEFT ((a), (s)); \ 119 (a) += (b); \ 120 } 121#define HH(a, b, c, d, x, s, ac) { \ 122 (a) += H ((b), (c), (d)) + (x) + (u_int32_t)(ac); \ 123 (a) = ROTATE_LEFT ((a), (s)); \ 124 (a) += (b); \ 125 } 126#define II(a, b, c, d, x, s, ac) { \ 127 (a) += I ((b), (c), (d)) + (x) + (u_int32_t)(ac); \ 128 (a) = ROTATE_LEFT ((a), (s)); \ 129 (a) += (b); \ 130 } 131 132/* MD5 initialization. Begins an MD5 operation, writing a new context. */ 133 134void 135MD5Init (context) 136 MD5_CTX *context; 137{ 138 139 context->count[0] = context->count[1] = 0; 140 141 /* Load magic initialization constants. */ 142 context->state[0] = 0x67452301; 143 context->state[1] = 0xefcdab89; 144 context->state[2] = 0x98badcfe; 145 context->state[3] = 0x10325476; 146} 147 148/* 149 * MD5 block update operation. Continues an MD5 message-digest 150 * operation, processing another message block, and updating the 151 * context. 152 */ 153 154void 155MD5Update (context, input, inputLen) 156 MD5_CTX *context; 157 const unsigned char *input; 158 unsigned int inputLen; 159{ 160 unsigned int i, index, partLen; 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 196void 197MD5Pad (context) 198 MD5_CTX *context; 199{ 200 unsigned char bits[8]; 201 unsigned int index, padLen; 202 203 /* Save number of bits */ 204 Encode (bits, context->count, 8); 205 206 /* Pad out to 56 mod 64. */ 207 index = (unsigned int)((context->count[0] >> 3) & 0x3f); 208 padLen = (index < 56) ? (56 - index) : (120 - index); 209 MD5Update (context, PADDING, padLen); 210 211 /* Append length (before padding) */ 212 MD5Update (context, bits, 8); 213} 214 215/* 216 * MD5 finalization. Ends an MD5 message-digest operation, writing the 217 * the message digest and zeroizing the context. 218 */ 219 220void 221MD5Final (digest, context) 222 unsigned char digest[16]; 223 MD5_CTX *context; 224{ 225 /* Do padding. */ 226 MD5Pad (context); 227 228 /* Store state in digest */ 229 Encode (digest, context->state, 16); 230 231 /* Zeroize sensitive information. */ 232 memset ((void *)context, 0, sizeof (*context)); 233} 234 235/* MD5 basic transformation. Transforms state based on block. */ 236 237void 238MD5Transform (state, block) 239 u_int32_t state[4]; 240 const unsigned char block[64]; 241{ 242 u_int32_t a = state[0], b = state[1], c = state[2], d = state[3], x[16]; 243 244 Decode (x, block, 64); 245 246 /* Round 1 */ 247#define S11 7 248#define S12 12 249#define S13 17 250#define S14 22 251 FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */ 252 FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */ 253 FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */ 254 FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */ 255 FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */ 256 FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */ 257 FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */ 258 FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */ 259 FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */ 260 FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */ 261 FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */ 262 FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */ 263 FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */ 264 FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */ 265 FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */ 266 FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */ 267 268 /* Round 2 */ 269#define S21 5 270#define S22 9 271#define S23 14 272#define S24 20 273 GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */ 274 GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */ 275 GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */ 276 GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */ 277 GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */ 278 GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */ 279 GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */ 280 GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */ 281 GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */ 282 GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */ 283 GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */ 284 GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */ 285 GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */ 286 GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */ 287 GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */ 288 GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */ 289 290 /* Round 3 */ 291#define S31 4 292#define S32 11 293#define S33 16 294#define S34 23 295 HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */ 296 HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */ 297 HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */ 298 HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */ 299 HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */ 300 HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */ 301 HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */ 302 HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */ 303 HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */ 304 HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */ 305 HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */ 306 HH (b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */ 307 HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */ 308 HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */ 309 HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */ 310 HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */ 311 312 /* Round 4 */ 313#define S41 6 314#define S42 10 315#define S43 15 316#define S44 21 317 II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */ 318 II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */ 319 II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */ 320 II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */ 321 II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */ 322 II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */ 323 II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */ 324 II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */ 325 II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */ 326 II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */ 327 II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */ 328 II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */ 329 II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */ 330 II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */ 331 II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */ 332 II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */ 333 334 state[0] += a; 335 state[1] += b; 336 state[2] += c; 337 state[3] += d; 338 339 /* Zeroize sensitive information. */ 340 memset ((void *)x, 0, sizeof (x)); 341} 342