1 /* 2 * MD5 hash implementation and interface functions 3 * Copyright (c) 2003-2005, Jouni Malinen <j (at) w1.fi> 4 * 5 * This software may be distributed under the terms of the BSD license. 6 * See README for more details. 7 */ 8 9 #include "includes.h" 10 11 #include "common.h" 12 #include "md5.h" 13 #include "md5_i.h" 14 #include "crypto.h" 15 16 17 static void MD5Transform(u32 buf[4], u32 const in[16]); 18 19 20 typedef struct MD5Context MD5_CTX; 21 22 23 /** 24 * md5_vector - MD5 hash for data vector 25 * @num_elem: Number of elements in the data vector 26 * @addr: Pointers to the data areas 27 * @len: Lengths of the data blocks 28 * @mac: Buffer for the hash 29 * Returns: 0 on success, -1 of failure 30 */ 31 int md5_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac) 32 { 33 MD5_CTX ctx; 34 size_t i; 35 36 if (TEST_FAIL()) 37 return -1; 38 39 MD5Init(&ctx); 40 for (i = 0; i < num_elem; i++) 41 MD5Update(&ctx, addr[i], len[i]); 42 MD5Final(mac, &ctx); 43 return 0; 44 } 45 46 47 /* ===== start - public domain MD5 implementation ===== */ 48 /* 49 * This code implements the MD5 message-digest algorithm. 50 * The algorithm is due to Ron Rivest. This code was 51 * written by Colin Plumb in 1993, no copyright is claimed. 52 * This code is in the public domain; do with it what you wish. 53 * 54 * Equivalent code is available from RSA Data Security, Inc. 55 * This code has been tested against that, and is equivalent, 56 * except that you don't need to include two pages of legalese 57 * with every copy. 58 * 59 * To compute the message digest of a chunk of bytes, declare an 60 * MD5Context structure, pass it to MD5Init, call MD5Update as 61 * needed on buffers full of bytes, and then call MD5Final, which 62 * will fill a supplied 16-byte array with the digest. 63 */ 64 65 #ifndef WORDS_BIGENDIAN 66 #define byteReverse(buf, len) /* Nothing */ 67 #else 68 /* 69 * Note: this code is harmless on little-endian machines. 70 */ 71 static void byteReverse(unsigned char *buf, unsigned longs) 72 { 73 u32 t; 74 do { 75 t = (u32) ((unsigned) buf[3] << 8 | buf[2]) << 16 | 76 ((unsigned) buf[1] << 8 | buf[0]); 77 *(u32 *) buf = t; 78 buf += 4; 79 } while (--longs); 80 } 81 #endif 82 83 /* 84 * Start MD5 accumulation. Set bit count to 0 and buffer to mysterious 85 * initialization constants. 86 */ 87 void MD5Init(struct MD5Context *ctx) 88 { 89 ctx->buf[0] = 0x67452301; 90 ctx->buf[1] = 0xefcdab89; 91 ctx->buf[2] = 0x98badcfe; 92 ctx->buf[3] = 0x10325476; 93 94 ctx->bits[0] = 0; 95 ctx->bits[1] = 0; 96 } 97 98 /* 99 * Update context to reflect the concatenation of another buffer full 100 * of bytes. 101 */ 102 void MD5Update(struct MD5Context *ctx, unsigned char const *buf, unsigned len) 103 { 104 u32 t; 105 106 /* Update bitcount */ 107 108 t = ctx->bits[0]; 109 if ((ctx->bits[0] = t + ((u32) len << 3)) < t) 110 ctx->bits[1]++; /* Carry from low to high */ 111 ctx->bits[1] += len >> 29; 112 113 t = (t >> 3) & 0x3f; /* Bytes already in shsInfo->data */ 114 115 /* Handle any leading odd-sized chunks */ 116 117 if (t) { 118 unsigned char *p = (unsigned char *) ctx->in + t; 119 120 t = 64 - t; 121 if (len < t) { 122 os_memcpy(p, buf, len); 123 return; 124 } 125 os_memcpy(p, buf, t); 126 byteReverse(ctx->in, 16); 127 MD5Transform(ctx->buf, (u32 *) ctx->in); 128 buf += t; 129 len -= t; 130 } 131 /* Process data in 64-byte chunks */ 132 133 while (len >= 64) { 134 os_memcpy(ctx->in, buf, 64); 135 byteReverse(ctx->in, 16); 136 MD5Transform(ctx->buf, (u32 *) ctx->in); 137 buf += 64; 138 len -= 64; 139 } 140 141 /* Handle any remaining bytes of data. */ 142 143 os_memcpy(ctx->in, buf, len); 144 } 145 146 /* 147 * Final wrapup - pad to 64-byte boundary with the bit pattern 148 * 1 0* (64-bit count of bits processed, MSB-first) 149 */ 150 void MD5Final(unsigned char digest[16], struct MD5Context *ctx) 151 { 152 unsigned count; 153 unsigned char *p; 154 155 /* Compute number of bytes mod 64 */ 156 count = (ctx->bits[0] >> 3) & 0x3F; 157 158 /* Set the first char of padding to 0x80. This is safe since there is 159 always at least one byte free */ 160 p = ctx->in + count; 161 *p++ = 0x80; 162 163 /* Bytes of padding needed to make 64 bytes */ 164 count = 64 - 1 - count; 165 166 /* Pad out to 56 mod 64 */ 167 if (count < 8) { 168 /* Two lots of padding: Pad the first block to 64 bytes */ 169 os_memset(p, 0, count); 170 byteReverse(ctx->in, 16); 171 MD5Transform(ctx->buf, (u32 *) ctx->in); 172 173 /* Now fill the next block with 56 bytes */ 174 os_memset(ctx->in, 0, 56); 175 } else { 176 /* Pad block to 56 bytes */ 177 os_memset(p, 0, count - 8); 178 } 179 byteReverse(ctx->in, 14); 180 181 /* Append length in bits and transform */ 182 ((u32 *) aliasing_hide_typecast(ctx->in, u32))[14] = ctx->bits[0]; 183 ((u32 *) aliasing_hide_typecast(ctx->in, u32))[15] = ctx->bits[1]; 184 185 MD5Transform(ctx->buf, (u32 *) ctx->in); 186 byteReverse((unsigned char *) ctx->buf, 4); 187 os_memcpy(digest, ctx->buf, 16); 188 os_memset(ctx, 0, sizeof(*ctx)); /* In case it's sensitive */ 189 } 190 191 /* The four core functions - F1 is optimized somewhat */ 192 193 /* #define F1(x, y, z) (x & y | ~x & z) */ 194 #define F1(x, y, z) (z ^ (x & (y ^ z))) 195 #define F2(x, y, z) F1(z, x, y) 196 #define F3(x, y, z) (x ^ y ^ z) 197 #define F4(x, y, z) (y ^ (x | ~z)) 198 199 /* This is the central step in the MD5 algorithm. */ 200 #define MD5STEP(f, w, x, y, z, data, s) \ 201 ( w += f(x, y, z) + data, w = w<<s | w>>(32-s), w += x ) 202 203 /* 204 * The core of the MD5 algorithm, this alters an existing MD5 hash to 205 * reflect the addition of 16 longwords of new data. MD5Update blocks 206 * the data and converts bytes into longwords for this routine. 207 */ 208 static void MD5Transform(u32 buf[4], u32 const in[16]) 209 { 210 register u32 a, b, c, d; 211 212 a = buf[0]; 213 b = buf[1]; 214 c = buf[2]; 215 d = buf[3]; 216 217 MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7); 218 MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12); 219 MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17); 220 MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22); 221 MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7); 222 MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12); 223 MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17); 224 MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22); 225 MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7); 226 MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12); 227 MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17); 228 MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22); 229 MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7); 230 MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12); 231 MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17); 232 MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22); 233 234 MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5); 235 MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9); 236 MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14); 237 MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20); 238 MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5); 239 MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9); 240 MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14); 241 MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20); 242 MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5); 243 MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9); 244 MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14); 245 MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20); 246 MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5); 247 MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9); 248 MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14); 249 MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20); 250 251 MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4); 252 MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11); 253 MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16); 254 MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23); 255 MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4); 256 MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11); 257 MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16); 258 MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23); 259 MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4); 260 MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11); 261 MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16); 262 MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23); 263 MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4); 264 MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11); 265 MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16); 266 MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23); 267 268 MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6); 269 MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10); 270 MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15); 271 MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21); 272 MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6); 273 MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10); 274 MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15); 275 MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21); 276 MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6); 277 MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10); 278 MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15); 279 MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21); 280 MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6); 281 MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10); 282 MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15); 283 MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21); 284 285 buf[0] += a; 286 buf[1] += b; 287 buf[2] += c; 288 buf[3] += d; 289 } 290 /* ===== end - public domain MD5 implementation ===== */ 291
