1 /*- 2 * SPDX-License-Identifier: RSA-MD 3 * 4 * MD5C.C - RSA Data Security, Inc., MD5 message-digest algorithm 5 * 6 * Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All 7 * rights reserved. 8 * 9 * License to copy and use this software is granted provided that it 10 * is identified as the "RSA Data Security, Inc. MD5 Message-Digest 11 * Algorithm" in all material mentioning or referencing this software 12 * or this function. 13 * 14 * License is also granted to make and use derivative works provided 15 * that such works are identified as "derived from the RSA Data 16 * Security, Inc. MD5 Message-Digest Algorithm" in all material 17 * mentioning or referencing the derived work. 18 * 19 * RSA Data Security, Inc. makes no representations concerning either 20 * the merchantability of this software or the suitability of this 21 * software for any particular purpose. It is provided "as is" 22 * without express or implied warranty of any kind. 23 * 24 * These notices must be retained in any copies of any part of this 25 * documentation and/or software. 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/cdefs.h> 32 __FBSDID("$FreeBSD$"); 33 34 #include <sys/types.h> 35 36 #ifdef _KERNEL 37 #include <sys/systm.h> 38 #else 39 #include <string.h> 40 #endif 41 42 #include <machine/endian.h> 43 #include <sys/endian.h> 44 #include "md5.h" 45 46 static void MD5Transform(u_int32_t [4], const unsigned char [64]); 47 48 #ifdef _KERNEL 49 #define memset(x,y,z) bzero(x,z); 50 #define memcpy(x,y,z) bcopy(y, x, z) 51 #endif 52 53 #if (BYTE_ORDER == LITTLE_ENDIAN) 54 #define Encode memcpy 55 #define Decode memcpy 56 #else 57 58 /* 59 * Encodes input (u_int32_t) into output (unsigned char). Assumes len is 60 * a multiple of 4. 61 */ 62 63 static void 64 Encode (unsigned char *output, u_int32_t *input, unsigned int len) 65 { 66 unsigned int i; 67 u_int32_t *op = (u_int32_t *)output; 68 69 for (i = 0; i < len / 4; i++) 70 op[i] = htole32(input[i]); 71 } 72 73 /* 74 * Decodes input (unsigned char) into output (u_int32_t). Assumes len is 75 * a multiple of 4. 76 */ 77 78 static void 79 Decode (u_int32_t *output, const unsigned char *input, unsigned int len) 80 { 81 unsigned int i; 82 const u_int32_t *ip = (const u_int32_t *)input; 83 84 for (i = 0; i < len / 4; i++) 85 output[i] = le32toh(ip[i]); 86 } 87 #endif 88 89 static unsigned char PADDING[64] = { 90 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 91 0, 0, 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 93 }; 94 95 /* F, G, H and I are basic MD5 functions. */ 96 #define F(x, y, z) (((x) & (y)) | ((~x) & (z))) 97 #define G(x, y, z) (((x) & (z)) | ((y) & (~z))) 98 #define H(x, y, z) ((x) ^ (y) ^ (z)) 99 #define I(x, y, z) ((y) ^ ((x) | (~z))) 100 101 /* ROTATE_LEFT rotates x left n bits. */ 102 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n)))) 103 104 /* 105 * FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4. 106 * Rotation is separate from addition to prevent recomputation. 107 */ 108 #define FF(a, b, c, d, x, s, ac) { \ 109 (a) += F ((b), (c), (d)) + (x) + (u_int32_t)(ac); \ 110 (a) = ROTATE_LEFT ((a), (s)); \ 111 (a) += (b); \ 112 } 113 #define GG(a, b, c, d, x, s, ac) { \ 114 (a) += G ((b), (c), (d)) + (x) + (u_int32_t)(ac); \ 115 (a) = ROTATE_LEFT ((a), (s)); \ 116 (a) += (b); \ 117 } 118 #define HH(a, b, c, d, x, s, ac) { \ 119 (a) += H ((b), (c), (d)) + (x) + (u_int32_t)(ac); \ 120 (a) = ROTATE_LEFT ((a), (s)); \ 121 (a) += (b); \ 122 } 123 #define II(a, b, c, d, x, s, ac) { \ 124 (a) += I ((b), (c), (d)) + (x) + (u_int32_t)(ac); \ 125 (a) = ROTATE_LEFT ((a), (s)); \ 126 (a) += (b); \ 127 } 128 129 /* MD5 initialization. Begins an MD5 operation, writing a new context. */ 130 131 void 132 MD5Init (MD5_CTX *context) 133 { 134 135 context->count[0] = context->count[1] = 0; 136 137 /* Load magic initialization constants. */ 138 context->state[0] = 0x67452301; 139 context->state[1] = 0xefcdab89; 140 context->state[2] = 0x98badcfe; 141 context->state[3] = 0x10325476; 142 } 143 144 /* 145 * MD5 block update operation. Continues an MD5 message-digest 146 * operation, processing another message block, and updating the 147 * context. 148 */ 149 150 void 151 MD5Update (MD5_CTX *context, const void *in, unsigned int inputLen) 152 { 153 unsigned int i, idx, partLen; 154 const unsigned char *input = in; 155 156 /* Compute number of bytes mod 64 */ 157 idx = (unsigned int)((context->count[0] >> 3) & 0x3F); 158 159 /* Update number of bits */ 160 if ((context->count[0] += ((u_int32_t)inputLen << 3)) 161 < ((u_int32_t)inputLen << 3)) 162 context->count[1]++; 163 context->count[1] += ((u_int32_t)inputLen >> 29); 164 165 partLen = 64 - idx; 166 167 /* Transform as many times as possible. */ 168 if (inputLen >= partLen) { 169 memcpy((void *)&context->buffer[idx], (const void *)input, 170 partLen); 171 MD5Transform (context->state, context->buffer); 172 173 for (i = partLen; i + 63 < inputLen; i += 64) 174 MD5Transform (context->state, &input[i]); 175 176 idx = 0; 177 } 178 else 179 i = 0; 180 181 /* Buffer remaining input */ 182 memcpy ((void *)&context->buffer[idx], (const void *)&input[i], 183 inputLen-i); 184 } 185 186 /* 187 * MD5 padding. Adds padding followed by original length. 188 */ 189 190 void 191 MD5Pad (MD5_CTX *context) 192 { 193 unsigned char bits[8]; 194 unsigned int idx, padLen; 195 196 /* Save number of bits */ 197 Encode (bits, context->count, 8); 198 199 /* Pad out to 56 mod 64. */ 200 idx = (unsigned int)((context->count[0] >> 3) & 0x3f); 201 padLen = (idx < 56) ? (56 - idx) : (120 - idx); 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 (unsigned char digest[16], MD5_CTX *context) 215 { 216 /* Do padding. */ 217 MD5Pad (context); 218 219 /* Store state in digest */ 220 Encode (digest, context->state, 16); 221 222 /* Zeroize sensitive information. */ 223 memset ((void *)context, 0, sizeof (*context)); 224 } 225 226 /* MD5 basic transformation. Transforms state based on block. */ 227 228 static void 229 MD5Transform (u_int32_t state[4], const unsigned char block[64]) 230 { 231 u_int32_t a = state[0], b = state[1], c = state[2], d = state[3], x[16]; 232 233 Decode (x, block, 64); 234 235 /* Round 1 */ 236 #define S11 7 237 #define S12 12 238 #define S13 17 239 #define S14 22 240 FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */ 241 FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */ 242 FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */ 243 FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */ 244 FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */ 245 FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */ 246 FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */ 247 FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */ 248 FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */ 249 FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */ 250 FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */ 251 FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */ 252 FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */ 253 FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */ 254 FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */ 255 FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */ 256 257 /* Round 2 */ 258 #define S21 5 259 #define S22 9 260 #define S23 14 261 #define S24 20 262 GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */ 263 GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */ 264 GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */ 265 GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */ 266 GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */ 267 GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */ 268 GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */ 269 GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */ 270 GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */ 271 GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */ 272 GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */ 273 GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */ 274 GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */ 275 GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */ 276 GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */ 277 GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */ 278 279 /* Round 3 */ 280 #define S31 4 281 #define S32 11 282 #define S33 16 283 #define S34 23 284 HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */ 285 HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */ 286 HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */ 287 HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */ 288 HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */ 289 HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */ 290 HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */ 291 HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */ 292 HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */ 293 HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */ 294 HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */ 295 HH (b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */ 296 HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */ 297 HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */ 298 HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */ 299 HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */ 300 301 /* Round 4 */ 302 #define S41 6 303 #define S42 10 304 #define S43 15 305 #define S44 21 306 II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */ 307 II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */ 308 II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */ 309 II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */ 310 II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */ 311 II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */ 312 II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */ 313 II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */ 314 II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */ 315 II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */ 316 II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */ 317 II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */ 318 II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */ 319 II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */ 320 II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */ 321 II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */ 322 323 state[0] += a; 324 state[1] += b; 325 state[2] += c; 326 state[3] += d; 327 328 /* Zeroize sensitive information. */ 329 memset ((void *)x, 0, sizeof (x)); 330 } 331 332 #ifdef WEAK_REFS 333 /* When building libmd, provide weak references. Note: this is not 334 activated in the context of compiling these sources for internal 335 use in libcrypt. 336 */ 337 #undef MD5Init 338 __weak_reference(_libmd_MD5Init, MD5Init); 339 #undef MD5Update 340 __weak_reference(_libmd_MD5Update, MD5Update); 341 #undef MD5Pad 342 __weak_reference(_libmd_MD5Pad, MD5Pad); 343 #undef MD5Final 344 __weak_reference(_libmd_MD5Final, MD5Final); 345 #undef MD5Transform 346 __weak_reference(_libmd_MD5Transform, MD5Transform); 347 #endif 348