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: src/lib/libmd/md5c.c,v 1.17 2006/01/17 15:35:56 phk Exp $"); 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#if (!defined(__BEOS__) && !defined(__HAIKU__)) 41#include <machine/endian.h> 42#include <sys/endian.h> 43#endif 44#include <stdint.h> 45#include <md5.h> 46 47static void MD5Transform(u_int32_t [4], const unsigned char [64]); 48 49#ifdef _KERNEL 50#define memset(x,y,z) bzero(x,z); 51#define memcpy(x,y,z) bcopy(y, x, z) 52#endif 53 54#if (BYTE_ORDER == LITTLE_ENDIAN) 55#define Encode memcpy 56#define Decode memcpy 57#else 58 59/* 60 * Encodes input (u_int32_t) into output (unsigned char). Assumes len is 61 * a multiple of 4. 62 */ 63 64static void 65Encode (unsigned char *output, u_int32_t *input, unsigned int len) 66{ 67 unsigned int i; 68 u_int32_t *op = (u_int32_t *)output; 69 70 for (i = 0; i < len / 4; i++) 71 op[i] = htole32(input[i]); 72} 73 74/* 75 * Decodes input (unsigned char) into output (u_int32_t). Assumes len is 76 * a multiple of 4. 77 */ 78 79static void 80Decode (u_int32_t *output, const unsigned char *input, unsigned int len) 81{ 82 unsigned int i; 83 const u_int32_t *ip = (const u_int32_t *)input; 84 85 for (i = 0; i < len / 4; i++) 86 output[i] = le32toh(ip[i]); 87} 88#endif 89 90static unsigned char PADDING[64] = { 91 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 92 0, 0, 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 94}; 95 96/* F, G, H and I are basic MD5 functions. */ 97#define F(x, y, z) (((x) & (y)) | ((~x) & (z))) 98#define G(x, y, z) (((x) & (z)) | ((y) & (~z))) 99#define H(x, y, z) ((x) ^ (y) ^ (z)) 100#define I(x, y, z) ((y) ^ ((x) | (~z))) 101 102/* ROTATE_LEFT rotates x left n bits. */ 103#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n)))) 104 105/* 106 * FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4. 107 * Rotation is separate from addition to prevent recomputation. 108 */ 109#define FF(a, b, c, d, x, s, ac) { \ 110 (a) += F ((b), (c), (d)) + (x) + (u_int32_t)(ac); \ 111 (a) = ROTATE_LEFT ((a), (s)); \ 112 (a) += (b); \ 113 } 114#define GG(a, b, c, d, x, s, ac) { \ 115 (a) += G ((b), (c), (d)) + (x) + (u_int32_t)(ac); \ 116 (a) = ROTATE_LEFT ((a), (s)); \ 117 (a) += (b); \ 118 } 119#define HH(a, b, c, d, x, s, ac) { \ 120 (a) += H ((b), (c), (d)) + (x) + (u_int32_t)(ac); \ 121 (a) = ROTATE_LEFT ((a), (s)); \ 122 (a) += (b); \ 123 } 124#define II(a, b, c, d, x, s, ac) { \ 125 (a) += I ((b), (c), (d)) + (x) + (u_int32_t)(ac); \ 126 (a) = ROTATE_LEFT ((a), (s)); \ 127 (a) += (b); \ 128 } 129 130/* MD5 initialization. Begins an MD5 operation, writing a new context. */ 131 132void 133MD5Init (context) 134 MD5_CTX *context; 135{ 136 137 context->count[0] = context->count[1] = 0; 138 139 /* Load magic initialization constants. */ 140 context->state[0] = 0x67452301; 141 context->state[1] = 0xefcdab89; 142 context->state[2] = 0x98badcfe; 143 context->state[3] = 0x10325476; 144} 145 146/* 147 * MD5 block update operation. Continues an MD5 message-digest 148 * operation, processing another message block, and updating the 149 * context. 150 */ 151 152void 153MD5Update (context, in, inputLen) 154 MD5_CTX *context; 155 const void *in; 156 unsigned int inputLen; 157{ 158 unsigned int i, idx, partLen; 159 const unsigned char *input = in; 160 161 /* Compute number of bytes mod 64 */ 162 idx = (unsigned int)((context->count[0] >> 3) & 0x3F); 163 164 /* Update number of bits */ 165 if ((context->count[0] += ((u_int32_t)inputLen << 3)) 166 < ((u_int32_t)inputLen << 3)) 167 context->count[1]++; 168 context->count[1] += ((u_int32_t)inputLen >> 29); 169 170 partLen = 64 - idx; 171 172 /* Transform as many times as possible. */ 173 if (inputLen >= partLen) { 174 memcpy((void *)&context->buffer[idx], (const void *)input, 175 partLen); 176 MD5Transform (context->state, context->buffer); 177 178 for (i = partLen; i + 63 < inputLen; i += 64) 179 MD5Transform (context->state, &input[i]); 180 181 idx = 0; 182 } 183 else 184 i = 0; 185 186 /* Buffer remaining input */ 187 memcpy ((void *)&context->buffer[idx], (const void *)&input[i], 188 inputLen-i); 189} 190 191/* 192 * MD5 padding. Adds padding followed by original length. 193 */ 194 195void 196MD5Pad (context) 197 MD5_CTX *context; 198{ 199 unsigned char bits[8]; 200 unsigned int idx, padLen; 201 202 /* Save number of bits */ 203 Encode (bits, context->count, 8); 204 205 /* Pad out to 56 mod 64. */ 206 idx = (unsigned int)((context->count[0] >> 3) & 0x3f); 207 padLen = (idx < 56) ? (56 - idx) : (120 - idx); 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 219void 220MD5Final (digest, context) 221 unsigned char digest[16]; 222 MD5_CTX *context; 223{ 224 /* Do padding. */ 225 MD5Pad (context); 226 227 /* Store state in digest */ 228 Encode (digest, context->state, 16); 229 230 /* Zeroize sensitive information. */ 231 memset ((void *)context, 0, sizeof (*context)); 232} 233 234/* MD5 basic transformation. Transforms state based on block. */ 235 236static void 237MD5Transform (state, block) 238 u_int32_t state[4]; 239 const unsigned char block[64]; 240{ 241 u_int32_t a = state[0], b = state[1], c = state[2], d = state[3], x[16]; 242 243 Decode (x, block, 64); 244 245 /* Round 1 */ 246#define S11 7 247#define S12 12 248#define S13 17 249#define S14 22 250 FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */ 251 FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */ 252 FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */ 253 FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */ 254 FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */ 255 FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */ 256 FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */ 257 FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */ 258 FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */ 259 FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */ 260 FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */ 261 FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */ 262 FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */ 263 FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */ 264 FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */ 265 FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */ 266 267 /* Round 2 */ 268#define S21 5 269#define S22 9 270#define S23 14 271#define S24 20 272 GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */ 273 GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */ 274 GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */ 275 GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */ 276 GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */ 277 GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */ 278 GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */ 279 GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */ 280 GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */ 281 GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */ 282 GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */ 283 GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */ 284 GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */ 285 GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */ 286 GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */ 287 GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */ 288 289 /* Round 3 */ 290#define S31 4 291#define S32 11 292#define S33 16 293#define S34 23 294 HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */ 295 HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */ 296 HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */ 297 HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */ 298 HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */ 299 HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */ 300 HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */ 301 HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */ 302 HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */ 303 HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */ 304 HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */ 305 HH (b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */ 306 HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */ 307 HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */ 308 HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */ 309 HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */ 310 311 /* Round 4 */ 312#define S41 6 313#define S42 10 314#define S43 15 315#define S44 21 316 II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */ 317 II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */ 318 II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */ 319 II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */ 320 II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */ 321 II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */ 322 II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */ 323 II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */ 324 II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */ 325 II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */ 326 II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */ 327 II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */ 328 II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */ 329 II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */ 330 II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */ 331 II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */ 332 333 state[0] += a; 334 state[1] += b; 335 state[2] += c; 336 state[3] += d; 337 338 /* Zeroize sensitive information. */ 339 memset ((void *)x, 0, sizeof (x)); 340} 341