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, style and inlineability. 27 */ 28 29 /* 30 * This header shall not have include guards, be included only locally 31 * and not export/pass MD5_CTX unless WITH_OPENSSL. 32 */ 33 34 #include <sys/cdefs.h> 35 #include <sys/types.h> 36 #include <string.h> 37 #include <machine/endian.h> 38 #include <sys/endian.h> 39 40 #ifdef WITH_OPENSSL 41 #include <openssl/md5.h> 42 #else 43 /* XXX must match <openssl/md5.h> !!! */ 44 #define MD5_CBLOCK 64 45 #define MD5_DIGEST_LENGTH 16 46 #define MD5_LBLOCK (MD5_CBLOCK/4) 47 #define MD5_LONG unsigned int 48 typedef struct MD5state_st { 49 MD5_LONG A,B,C,D; 50 MD5_LONG Nl,Nh; 51 MD5_LONG data[MD5_LBLOCK]; 52 unsigned int num; 53 } MD5_CTX; 54 #endif 55 56 #define MD5_BLOCK_LENGTH MD5_CBLOCK 57 #define MD5_DIGEST_STRING_LENGTH (MD5_DIGEST_LENGTH * 2 + 1) 58 59 #if (BYTE_ORDER == LITTLE_ENDIAN) 60 #define _md5_Encode memcpy 61 #define _md5_Decode memcpy 62 #else 63 64 /* 65 * Encodes input (u_int32_t) into output (unsigned char). Assumes len is 66 * a multiple of 4. 67 */ 68 static void 69 _md5_Encode (unsigned char *output, u_int32_t *input, unsigned int len) 70 { 71 unsigned int i; 72 u_int32_t *op = (u_int32_t *)output; 73 74 for (i = 0; i < len / 4; i++) 75 op[i] = htole32(input[i]); 76 } 77 78 /* 79 * Decodes input (unsigned char) into output (u_int32_t). Assumes len is 80 * a multiple of 4. 81 */ 82 static void 83 _md5_Decode (u_int32_t *output, const unsigned char *input, unsigned int len) 84 { 85 unsigned int i; 86 const u_int32_t *ip = (const u_int32_t *)input; 87 88 for (i = 0; i < len / 4; i++) 89 output[i] = le32toh(ip[i]); 90 } 91 #endif 92 93 static unsigned char _md5_PADDING[64] = { 94 0x80, 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, 0, 0, 0, 0, 96 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 97 }; 98 99 /* F, G, H and I are basic MD5 functions. */ 100 #define _md5_F(x, y, z) (((x) & (y)) | ((~x) & (z))) 101 #define _md5_G(x, y, z) (((x) & (z)) | ((y) & (~z))) 102 #define _md5_H(x, y, z) ((x) ^ (y) ^ (z)) 103 #define _md5_I(x, y, z) ((y) ^ ((x) | (~z))) 104 105 /* ROTATE_LEFT rotates x left n bits. */ 106 #define _md5_ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n)))) 107 108 /* 109 * FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4. 110 * Rotation is separate from addition to prevent recomputation. 111 */ 112 #define _md5_FF(a, b, c, d, x, s, ac) { \ 113 (a) += _md5_F ((b), (c), (d)) + (x) + (u_int32_t)(ac); \ 114 (a) = _md5_ROTATE_LEFT ((a), (s)); \ 115 (a) += (b); \ 116 } 117 #define _md5_GG(a, b, c, d, x, s, ac) { \ 118 (a) += _md5_G ((b), (c), (d)) + (x) + (u_int32_t)(ac); \ 119 (a) = _md5_ROTATE_LEFT ((a), (s)); \ 120 (a) += (b); \ 121 } 122 #define _md5_HH(a, b, c, d, x, s, ac) { \ 123 (a) += _md5_H ((b), (c), (d)) + (x) + (u_int32_t)(ac); \ 124 (a) = _md5_ROTATE_LEFT ((a), (s)); \ 125 (a) += (b); \ 126 } 127 #define _md5_II(a, b, c, d, x, s, ac) { \ 128 (a) += _md5_I ((b), (c), (d)) + (x) + (u_int32_t)(ac); \ 129 (a) = _md5_ROTATE_LEFT ((a), (s)); \ 130 (a) += (b); \ 131 } 132 133 /* MD5 basic transformation. Transforms state based on block. */ 134 static void 135 MD5Transform (u_int32_t *state, const unsigned char *block) 136 { 137 u_int32_t a = state[0], b = state[1], c = state[2], d = state[3], x[16]; 138 139 _md5_Decode (x, block, 64); 140 141 /* Round 1 */ 142 #define _md5_S11 7 143 #define _md5_S12 12 144 #define _md5_S13 17 145 #define _md5_S14 22 146 _md5_FF (a, b, c, d, x[ 0], _md5_S11, 0xd76aa478); /* 1 */ 147 _md5_FF (d, a, b, c, x[ 1], _md5_S12, 0xe8c7b756); /* 2 */ 148 _md5_FF (c, d, a, b, x[ 2], _md5_S13, 0x242070db); /* 3 */ 149 _md5_FF (b, c, d, a, x[ 3], _md5_S14, 0xc1bdceee); /* 4 */ 150 _md5_FF (a, b, c, d, x[ 4], _md5_S11, 0xf57c0faf); /* 5 */ 151 _md5_FF (d, a, b, c, x[ 5], _md5_S12, 0x4787c62a); /* 6 */ 152 _md5_FF (c, d, a, b, x[ 6], _md5_S13, 0xa8304613); /* 7 */ 153 _md5_FF (b, c, d, a, x[ 7], _md5_S14, 0xfd469501); /* 8 */ 154 _md5_FF (a, b, c, d, x[ 8], _md5_S11, 0x698098d8); /* 9 */ 155 _md5_FF (d, a, b, c, x[ 9], _md5_S12, 0x8b44f7af); /* 10 */ 156 _md5_FF (c, d, a, b, x[10], _md5_S13, 0xffff5bb1); /* 11 */ 157 _md5_FF (b, c, d, a, x[11], _md5_S14, 0x895cd7be); /* 12 */ 158 _md5_FF (a, b, c, d, x[12], _md5_S11, 0x6b901122); /* 13 */ 159 _md5_FF (d, a, b, c, x[13], _md5_S12, 0xfd987193); /* 14 */ 160 _md5_FF (c, d, a, b, x[14], _md5_S13, 0xa679438e); /* 15 */ 161 _md5_FF (b, c, d, a, x[15], _md5_S14, 0x49b40821); /* 16 */ 162 163 /* Round 2 */ 164 #define _md5_S21 5 165 #define _md5_S22 9 166 #define _md5_S23 14 167 #define _md5_S24 20 168 _md5_GG (a, b, c, d, x[ 1], _md5_S21, 0xf61e2562); /* 17 */ 169 _md5_GG (d, a, b, c, x[ 6], _md5_S22, 0xc040b340); /* 18 */ 170 _md5_GG (c, d, a, b, x[11], _md5_S23, 0x265e5a51); /* 19 */ 171 _md5_GG (b, c, d, a, x[ 0], _md5_S24, 0xe9b6c7aa); /* 20 */ 172 _md5_GG (a, b, c, d, x[ 5], _md5_S21, 0xd62f105d); /* 21 */ 173 _md5_GG (d, a, b, c, x[10], _md5_S22, 0x2441453); /* 22 */ 174 _md5_GG (c, d, a, b, x[15], _md5_S23, 0xd8a1e681); /* 23 */ 175 _md5_GG (b, c, d, a, x[ 4], _md5_S24, 0xe7d3fbc8); /* 24 */ 176 _md5_GG (a, b, c, d, x[ 9], _md5_S21, 0x21e1cde6); /* 25 */ 177 _md5_GG (d, a, b, c, x[14], _md5_S22, 0xc33707d6); /* 26 */ 178 _md5_GG (c, d, a, b, x[ 3], _md5_S23, 0xf4d50d87); /* 27 */ 179 _md5_GG (b, c, d, a, x[ 8], _md5_S24, 0x455a14ed); /* 28 */ 180 _md5_GG (a, b, c, d, x[13], _md5_S21, 0xa9e3e905); /* 29 */ 181 _md5_GG (d, a, b, c, x[ 2], _md5_S22, 0xfcefa3f8); /* 30 */ 182 _md5_GG (c, d, a, b, x[ 7], _md5_S23, 0x676f02d9); /* 31 */ 183 _md5_GG (b, c, d, a, x[12], _md5_S24, 0x8d2a4c8a); /* 32 */ 184 185 /* Round 3 */ 186 #define _md5_S31 4 187 #define _md5_S32 11 188 #define _md5_S33 16 189 #define _md5_S34 23 190 _md5_HH (a, b, c, d, x[ 5], _md5_S31, 0xfffa3942); /* 33 */ 191 _md5_HH (d, a, b, c, x[ 8], _md5_S32, 0x8771f681); /* 34 */ 192 _md5_HH (c, d, a, b, x[11], _md5_S33, 0x6d9d6122); /* 35 */ 193 _md5_HH (b, c, d, a, x[14], _md5_S34, 0xfde5380c); /* 36 */ 194 _md5_HH (a, b, c, d, x[ 1], _md5_S31, 0xa4beea44); /* 37 */ 195 _md5_HH (d, a, b, c, x[ 4], _md5_S32, 0x4bdecfa9); /* 38 */ 196 _md5_HH (c, d, a, b, x[ 7], _md5_S33, 0xf6bb4b60); /* 39 */ 197 _md5_HH (b, c, d, a, x[10], _md5_S34, 0xbebfbc70); /* 40 */ 198 _md5_HH (a, b, c, d, x[13], _md5_S31, 0x289b7ec6); /* 41 */ 199 _md5_HH (d, a, b, c, x[ 0], _md5_S32, 0xeaa127fa); /* 42 */ 200 _md5_HH (c, d, a, b, x[ 3], _md5_S33, 0xd4ef3085); /* 43 */ 201 _md5_HH (b, c, d, a, x[ 6], _md5_S34, 0x4881d05); /* 44 */ 202 _md5_HH (a, b, c, d, x[ 9], _md5_S31, 0xd9d4d039); /* 45 */ 203 _md5_HH (d, a, b, c, x[12], _md5_S32, 0xe6db99e5); /* 46 */ 204 _md5_HH (c, d, a, b, x[15], _md5_S33, 0x1fa27cf8); /* 47 */ 205 _md5_HH (b, c, d, a, x[ 2], _md5_S34, 0xc4ac5665); /* 48 */ 206 207 /* Round 4 */ 208 #define _md5_S41 6 209 #define _md5_S42 10 210 #define _md5_S43 15 211 #define _md5_S44 21 212 _md5_II (a, b, c, d, x[ 0], _md5_S41, 0xf4292244); /* 49 */ 213 _md5_II (d, a, b, c, x[ 7], _md5_S42, 0x432aff97); /* 50 */ 214 _md5_II (c, d, a, b, x[14], _md5_S43, 0xab9423a7); /* 51 */ 215 _md5_II (b, c, d, a, x[ 5], _md5_S44, 0xfc93a039); /* 52 */ 216 _md5_II (a, b, c, d, x[12], _md5_S41, 0x655b59c3); /* 53 */ 217 _md5_II (d, a, b, c, x[ 3], _md5_S42, 0x8f0ccc92); /* 54 */ 218 _md5_II (c, d, a, b, x[10], _md5_S43, 0xffeff47d); /* 55 */ 219 _md5_II (b, c, d, a, x[ 1], _md5_S44, 0x85845dd1); /* 56 */ 220 _md5_II (a, b, c, d, x[ 8], _md5_S41, 0x6fa87e4f); /* 57 */ 221 _md5_II (d, a, b, c, x[15], _md5_S42, 0xfe2ce6e0); /* 58 */ 222 _md5_II (c, d, a, b, x[ 6], _md5_S43, 0xa3014314); /* 59 */ 223 _md5_II (b, c, d, a, x[13], _md5_S44, 0x4e0811a1); /* 60 */ 224 _md5_II (a, b, c, d, x[ 4], _md5_S41, 0xf7537e82); /* 61 */ 225 _md5_II (d, a, b, c, x[11], _md5_S42, 0xbd3af235); /* 62 */ 226 _md5_II (c, d, a, b, x[ 2], _md5_S43, 0x2ad7d2bb); /* 63 */ 227 _md5_II (b, c, d, a, x[ 9], _md5_S44, 0xeb86d391); /* 64 */ 228 229 state[0] += a; 230 state[1] += b; 231 state[2] += c; 232 state[3] += d; 233 234 /* Zeroize sensitive information. */ 235 memset ((void *)x, 0, sizeof (x)); 236 } 237 238 /* MD5 initialization. Begins an MD5 operation, writing a new context. */ 239 static int 240 MD5Init (MD5_CTX *context) 241 { 242 243 context->Nl = context->Nh = 0; 244 245 /* Load magic initialization constants. */ 246 context->A = 0x67452301; 247 context->B = 0xefcdab89; 248 context->C = 0x98badcfe; 249 context->D = 0x10325476; 250 return 1; 251 } 252 /* 253 * MD5 block update operation. Continues an MD5 message-digest 254 * operation, processing another message block, and updating the 255 * context. 256 */ 257 static void 258 MD5Update (MD5_CTX *context, const void *in, unsigned int inputLen) 259 { 260 unsigned int i, idx, partLen; 261 const unsigned char *input = in; 262 263 /* Compute number of bytes mod 64 */ 264 idx = (unsigned int)((context->Nl >> 3) & 0x3F); 265 266 /* Update number of bits */ 267 if ((context->Nl += ((u_int32_t)inputLen << 3)) 268 < ((u_int32_t)inputLen << 3)) 269 context->Nh++; 270 context->Nh += ((u_int32_t)inputLen >> 29); 271 272 partLen = 64 - idx; 273 274 /* Transform as many times as possible. */ 275 if (inputLen >= partLen) { 276 memcpy(&((char *)context->data)[idx], (const void *)input, 277 partLen); 278 MD5Transform (&context->A, (unsigned char *)context->data); 279 280 for (i = partLen; i + 63 < inputLen; i += 64) 281 MD5Transform (&context->A, &input[i]); 282 283 idx = 0; 284 } 285 else 286 i = 0; 287 288 /* Buffer remaining input */ 289 memcpy (&((char *)context->data)[idx], (const void *)&input[i], 290 inputLen-i); 291 } 292 293 /* 294 * MD5 padding. Adds padding followed by original length. 295 */ 296 static void 297 MD5Pad (MD5_CTX *context) 298 { 299 unsigned char bits[8]; 300 unsigned int idx, padLen; 301 302 /* Save number of bits */ 303 _md5_Encode (bits, &context->Nl, 8); 304 305 /* Pad out to 56 mod 64. */ 306 idx = (unsigned int)((context->Nl >> 3) & 0x3f); 307 padLen = (idx < 56) ? (56 - idx) : (120 - idx); 308 MD5Update (context, _md5_PADDING, padLen); 309 310 /* Append length (before padding) */ 311 MD5Update (context, bits, 8); 312 } 313 314 /* 315 * MD5 finalization. Ends an MD5 message-digest operation, writing the 316 * the message digest and zeroizing the context. 317 */ 318 static void 319 MD5Final (unsigned char digest[16], MD5_CTX *context) 320 { 321 /* Do padding. */ 322 MD5Pad (context); 323 324 /* Store state in digest */ 325 _md5_Encode (digest, &context->A, 16); 326 327 /* Zeroize sensitive information. */ 328 memset ((void *)context, 0, sizeof (*context)); 329 } 330