1/* 2 * This code implements the MD5 message-digest algorithm. 3 * The algorithm is due to Ron Rivest. This code was 4 * written by Colin Plumb in 1993, no copyright is claimed. 5 * This code is in the public domain; do with it what you wish. 6 * 7 * Equivalent code is available from RSA Data Security, Inc. 8 * This code has been tested against that, and is equivalent, 9 * except that you don't need to include two pages of legalese 10 * with every copy. 11 * 12 * LIC: GPL 13 * 14 * To compute the message digest of a chunk of bytes, declare an 15 * MD5Context structure, pass it to MD5Init, call MD5Update as 16 * needed on buffers full of bytes, and then call MD5Final, which 17 * will fill a supplied 16-byte array with the digest. 18 */ 19#include <string.h> /* for memcpy() */ 20#include "md5.h" 21 22static void byteReverse(unsigned char *buf, unsigned longs); 23 24/* 25 * Note: this code is harmless on little-endian machines. 26 */ 27static void 28byteReverse(unsigned char *buf, unsigned longs) 29{ 30 uint32 t; 31 do { 32 t = (uint32) ((unsigned) buf[3] << 8 | buf[2]) << 16 | 33 ((unsigned) buf[1] << 8 | buf[0]); 34 *(uint32 *) buf = t; 35 buf += 4; 36 } while (--longs); 37} 38 39/* 40 * Start MD5 accumulation. Set bit count to 0 and buffer to mysterious 41 * initialization constants. 42 */ 43void MD5Init(struct MD5Context *ctx) 44{ 45 ctx->buf[0] = 0x67452301; 46 ctx->buf[1] = 0xefcdab89; 47 ctx->buf[2] = 0x98badcfe; 48 ctx->buf[3] = 0x10325476; 49 50 ctx->bits[0] = 0; 51 ctx->bits[1] = 0; 52} 53 54/* 55 * Update context to reflect the concatenation of another buffer full 56 * of bytes. 57 */ 58void MD5Update(struct MD5Context *ctx, unsigned char const *buf, unsigned len) 59{ 60 uint32 t; 61 62 /* Update bitcount */ 63 64 t = ctx->bits[0]; 65 if ((ctx->bits[0] = t + ((uint32) len << 3)) < t) 66 ctx->bits[1]++; /* Carry from low to high */ 67 ctx->bits[1] += len >> 29; 68 69 t = (t >> 3) & 0x3f; /* Bytes already in shsInfo->data */ 70 71 /* Handle any leading odd-sized chunks */ 72 73 if (t) { 74 unsigned char *p = (unsigned char *) ctx->in + t; 75 76 t = 64 - t; 77 if (len < t) { 78 memcpy(p, buf, len); 79 return; 80 } 81 memcpy(p, buf, t); 82 byteReverse(ctx->in, 16); 83 MD5Transform(ctx->buf, (uint32 *) ctx->in); 84 buf += t; 85 len -= t; 86 } 87 /* Process data in 64-byte chunks */ 88 89 while (len >= 64) { 90 memcpy(ctx->in, buf, 64); 91 byteReverse(ctx->in, 16); 92 MD5Transform(ctx->buf, (uint32 *) ctx->in); 93 buf += 64; 94 len -= 64; 95 } 96 97 /* Handle any remaining bytes of data. */ 98 99 memcpy(ctx->in, buf, len); 100} 101 102/* 103 * Final wrapup - pad to 64-byte boundary with the bit pattern 104 * 1 0* (64-bit count of bits processed, MSB-first) 105 */ 106void MD5Final(unsigned char digest[16], struct MD5Context *ctx) 107{ 108 unsigned count; 109 unsigned char *p; 110 111 /* Compute number of bytes mod 64 */ 112 count = (ctx->bits[0] >> 3) & 0x3F; 113 114 /* Set the first char of padding to 0x80. This is safe since there is 115 always at least one byte free */ 116 p = ctx->in + count; 117 *p++ = 0x80; 118 119 /* Bytes of padding needed to make 64 bytes */ 120 count = 64 - 1 - count; 121 122 /* Pad out to 56 mod 64 */ 123 if (count < 8) { 124 /* Two lots of padding: Pad the first block to 64 bytes */ 125 memset(p, 0, count); 126 byteReverse(ctx->in, 16); 127 MD5Transform(ctx->buf, (uint32 *) ctx->in); 128 129 /* Now fill the next block with 56 bytes */ 130 memset(ctx->in, 0, 56); 131 } else { 132 /* Pad block to 56 bytes */ 133 memset(p, 0, count - 8); 134 } 135 byteReverse(ctx->in, 14); 136 137 /* Append length in bits and transform */ 138 ((uint32 *) ctx->in)[14] = ctx->bits[0]; 139 ((uint32 *) ctx->in)[15] = ctx->bits[1]; 140 141 MD5Transform(ctx->buf, (uint32 *) ctx->in); 142 byteReverse((unsigned char *) ctx->buf, 4); 143 memcpy(digest, ctx->buf, 16); 144 memset(ctx, 0, sizeof(ctx)); /* In case it's sensitive */ 145} 146 147#ifndef ASM_MD5 148 149/* The four core functions - F1 is optimized somewhat */ 150 151/* #define F1(x, y, z) (x & y | ~x & z) */ 152#define F1(x, y, z) (z ^ (x & (y ^ z))) 153#define F2(x, y, z) F1(z, x, y) 154#define F3(x, y, z) (x ^ y ^ z) 155#define F4(x, y, z) (y ^ (x | ~z)) 156 157/* This is the central step in the MD5 algorithm. */ 158#define MD5STEP(f, w, x, y, z, data, s) \ 159 ( w += f(x, y, z) + data, w = w<<s | w>>(32-s), w += x ) 160 161/* 162 * The core of the MD5 algorithm, this alters an existing MD5 hash to 163 * reflect the addition of 16 longwords of new data. MD5Update blocks 164 * the data and converts bytes into longwords for this routine. 165 */ 166void MD5Transform(uint32 buf[4], uint32 const in[16]) 167{ 168 register uint32 a, b, c, d; 169 170 a = buf[0]; 171 b = buf[1]; 172 c = buf[2]; 173 d = buf[3]; 174 175 MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7); 176 MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12); 177 MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17); 178 MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22); 179 MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7); 180 MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12); 181 MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17); 182 MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22); 183 MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7); 184 MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12); 185 MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17); 186 MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22); 187 MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7); 188 MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12); 189 MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17); 190 MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22); 191 192 MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5); 193 MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9); 194 MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14); 195 MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20); 196 MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5); 197 MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9); 198 MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14); 199 MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20); 200 MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5); 201 MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9); 202 MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14); 203 MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20); 204 MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5); 205 MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9); 206 MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14); 207 MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20); 208 209 MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4); 210 MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11); 211 MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16); 212 MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23); 213 MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4); 214 MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11); 215 MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16); 216 MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23); 217 MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4); 218 MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11); 219 MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16); 220 MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23); 221 MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4); 222 MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11); 223 MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16); 224 MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23); 225 226 MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6); 227 MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10); 228 MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15); 229 MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21); 230 MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6); 231 MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10); 232 MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15); 233 MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21); 234 MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6); 235 MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10); 236 MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15); 237 MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21); 238 MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6); 239 MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10); 240 MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15); 241 MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21); 242 243 buf[0] += a; 244 buf[1] += b; 245 buf[2] += c; 246 buf[3] += d; 247} 248 249#endif 250