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