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#include <sys/cdefs.h> 30__FBSDID("$FreeBSD$"); 31 32#include <sys/types.h> 33 34#ifdef _KERNEL 35#include <sys/systm.h> 36#else 37#include <string.h> 38#endif 39 40#include <machine/endian.h> 41#include <sys/endian.h> 42#include "md5.h" 43 44static void MD5Transform(u_int32_t [4], const unsigned char [64]); 45 46#ifdef _KERNEL 47#define memset(x,y,z) bzero(x,z); 48#define memcpy(x,y,z) bcopy(y, x, z) 49#endif 50 51#if (BYTE_ORDER == LITTLE_ENDIAN) 52#define Encode memcpy 53#define Decode memcpy 54#else 55 56/* 57 * Encodes input (u_int32_t) into output (unsigned char). Assumes len is 58 * a multiple of 4. 59 */ 60 61static void 62Encode (unsigned char *output, u_int32_t *input, unsigned int len) 63{ 64 unsigned int i; 65 u_int32_t *op = (u_int32_t *)output; 66 67 for (i = 0; i < len / 4; i++) 68 op[i] = htole32(input[i]); 69} 70 71/* 72 * Decodes input (unsigned char) into output (u_int32_t). Assumes len is 73 * a multiple of 4. 74 */ 75 76static void 77Decode (u_int32_t *output, const unsigned char *input, unsigned int len) 78{ 79 unsigned int i; 80 const u_int32_t *ip = (const u_int32_t *)input; 81 82 for (i = 0; i < len / 4; i++) 83 output[i] = le32toh(ip[i]); 84} 85#endif 86 87static unsigned char PADDING[64] = { 88 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 89 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 90 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 91}; 92 93/* F, G, H and I are basic MD5 functions. */ 94#define F(x, y, z) (((x) & (y)) | ((~x) & (z))) 95#define G(x, y, z) (((x) & (z)) | ((y) & (~z))) 96#define H(x, y, z) ((x) ^ (y) ^ (z)) 97#define I(x, y, z) ((y) ^ ((x) | (~z))) 98 99/* ROTATE_LEFT rotates x left n bits. */ 100#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n)))) 101 102/* 103 * FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4. 104 * Rotation is separate from addition to prevent recomputation. 105 */ 106#define FF(a, b, c, d, x, s, ac) { \ 107 (a) += F ((b), (c), (d)) + (x) + (u_int32_t)(ac); \ 108 (a) = ROTATE_LEFT ((a), (s)); \ 109 (a) += (b); \ 110 } 111#define GG(a, b, c, d, x, s, ac) { \ 112 (a) += G ((b), (c), (d)) + (x) + (u_int32_t)(ac); \ 113 (a) = ROTATE_LEFT ((a), (s)); \ 114 (a) += (b); \ 115 } 116#define HH(a, b, c, d, x, s, ac) { \ 117 (a) += H ((b), (c), (d)) + (x) + (u_int32_t)(ac); \ 118 (a) = ROTATE_LEFT ((a), (s)); \ 119 (a) += (b); \ 120 } 121#define II(a, b, c, d, x, s, ac) { \ 122 (a) += I ((b), (c), (d)) + (x) + (u_int32_t)(ac); \ 123 (a) = ROTATE_LEFT ((a), (s)); \ 124 (a) += (b); \ 125 } 126 127/* MD5 initialization. Begins an MD5 operation, writing a new context. */ 128 129void 130MD5Init (context) 131 MD5_CTX *context; 132{ 133 134 context->count[0] = context->count[1] = 0; 135 136 /* Load magic initialization constants. */ 137 context->state[0] = 0x67452301; 138 context->state[1] = 0xefcdab89; 139 context->state[2] = 0x98badcfe; 140 context->state[3] = 0x10325476; 141} 142 143/* 144 * MD5 block update operation. Continues an MD5 message-digest 145 * operation, processing another message block, and updating the 146 * context. 147 */ 148 149void 150MD5Update (context, in, inputLen) 151 MD5_CTX *context; 152 const void *in; 153 unsigned int inputLen; 154{ 155 unsigned int i, idx, partLen; 156 const unsigned char *input = in; 157 158 /* Compute number of bytes mod 64 */ 159 idx = (unsigned int)((context->count[0] >> 3) & 0x3F); 160 161 /* Update number of bits */ 162 if ((context->count[0] += ((u_int32_t)inputLen << 3)) 163 < ((u_int32_t)inputLen << 3)) 164 context->count[1]++; 165 context->count[1] += ((u_int32_t)inputLen >> 29); 166 167 partLen = 64 - idx; 168 169 /* Transform as many times as possible. */ 170 if (inputLen >= partLen) { 171 memcpy((void *)&context->buffer[idx], (const void *)input, 172 partLen); 173 MD5Transform (context->state, context->buffer); 174 175 for (i = partLen; i + 63 < inputLen; i += 64) 176 MD5Transform (context->state, &input[i]); 177 178 idx = 0; 179 } 180 else 181 i = 0; 182 183 /* Buffer remaining input */ 184 memcpy ((void *)&context->buffer[idx], (const void *)&input[i], 185 inputLen-i); 186} 187 188/* 189 * MD5 padding. Adds padding followed by original length. 190 */ 191 192void 193MD5Pad (context) 194 MD5_CTX *context; 195{ 196 unsigned char bits[8]; 197 unsigned int idx, padLen; 198 199 /* Save number of bits */ 200 Encode (bits, context->count, 8); 201 202 /* Pad out to 56 mod 64. */ 203 idx = (unsigned int)((context->count[0] >> 3) & 0x3f); 204 padLen = (idx < 56) ? (56 - idx) : (120 - idx); 205 MD5Update (context, PADDING, padLen); 206 207 /* Append length (before padding) */ 208 MD5Update (context, bits, 8); 209} 210 211/* 212 * MD5 finalization. Ends an MD5 message-digest operation, writing the 213 * the message digest and zeroizing the context. 214 */ 215 216void 217MD5Final (digest, context) 218 unsigned char digest[16]; 219 MD5_CTX *context; 220{ 221 /* Do padding. */ 222 MD5Pad (context); 223 224 /* Store state in digest */ 225 Encode (digest, context->state, 16); 226 227 /* Zeroize sensitive information. */ 228 memset ((void *)context, 0, sizeof (*context)); 229} 230 231/* MD5 basic transformation. Transforms state based on block. */ 232 233static void 234MD5Transform (state, block) 235 u_int32_t state[4]; 236 const unsigned char block[64]; 237{ 238 u_int32_t a = state[0], b = state[1], c = state[2], d = state[3], x[16]; 239 240 Decode (x, block, 64); 241 242 /* Round 1 */ 243#define S11 7 244#define S12 12 245#define S13 17 246#define S14 22 247 FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */ 248 FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */ 249 FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */ 250 FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */ 251 FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */ 252 FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */ 253 FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */ 254 FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */ 255 FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */ 256 FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */ 257 FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */ 258 FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */ 259 FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */ 260 FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */ 261 FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */ 262 FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */ 263 264 /* Round 2 */ 265#define S21 5 266#define S22 9 267#define S23 14 268#define S24 20 269 GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */ 270 GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */ 271 GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */ 272 GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */ 273 GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */ 274 GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */ 275 GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */ 276 GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */ 277 GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */ 278 GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */ 279 GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */ 280 GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */ 281 GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */ 282 GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */ 283 GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */ 284 GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */ 285 286 /* Round 3 */ 287#define S31 4 288#define S32 11 289#define S33 16 290#define S34 23 291 HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */ 292 HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */ 293 HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */ 294 HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */ 295 HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */ 296 HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */ 297 HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */ 298 HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */ 299 HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */ 300 HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */ 301 HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */ 302 HH (b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */ 303 HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */ 304 HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */ 305 HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */ 306 HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */ 307 308 /* Round 4 */ 309#define S41 6 310#define S42 10 311#define S43 15 312#define S44 21 313 II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */ 314 II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */ 315 II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */ 316 II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */ 317 II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */ 318 II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */ 319 II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */ 320 II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */ 321 II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */ 322 II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */ 323 II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */ 324 II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */ 325 II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */ 326 II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */ 327 II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */ 328 II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */ 329 330 state[0] += a; 331 state[1] += b; 332 state[2] += c; 333 state[3] += d; 334 335 /* Zeroize sensitive information. */ 336 memset ((void *)x, 0, sizeof (x)); 337} 338 339#ifdef WEAK_REFS 340/* When building libmd, provide weak references. Note: this is not 341 activated in the context of compiling these sources for internal 342 use in libcrypt. 343 */ 344#undef MD5Init 345__weak_reference(_libmd_MD5Init, MD5Init); 346#undef MD5Update 347__weak_reference(_libmd_MD5Update, MD5Update); 348#undef MD5Pad 349__weak_reference(_libmd_MD5Pad, MD5Pad); 350#undef MD5Final 351__weak_reference(_libmd_MD5Final, MD5Final); 352#undef MD5Transform 353__weak_reference(_libmd_MD5Transform, MD5Transform); 354#endif 355