Annotation of embedaddon/coova-chilli/src/md5.c, revision 1.1
1.1 ! misho 1: /*
! 2: *
! 3: * This code implements the MD5 message-digest algorithm.
! 4: * The algorithm is due to Ron Rivest. This code was
! 5: * written by Colin Plumb in 1993, no copyright is claimed.
! 6: * This code is in the public domain; do with it what you wish.
! 7: *
! 8: * Equivalent code is available from RSA Data Security, Inc.
! 9: * This code has been tested against that, and is equivalent,
! 10: * except that you don't need to include two pages of legalese
! 11: * with every copy.
! 12: *
! 13: * To compute the message digest of a chunk of bytes, declare an
! 14: * MD5Context structure, pass it to MD5Init, call MD5Update as
! 15: * needed on buffers full of bytes, and then call MD5Final, which
! 16: * will fill a supplied 16-byte array with the digest.
! 17: */
! 18: #include <string.h> /* for memcpy() */
! 19: #include "md5.h"
! 20:
! 21: void byteReverse(unsigned char *buf, size_t longs);
! 22:
! 23: /*
! 24: * Note: this code is harmless on little-endian machines.
! 25: */
! 26: void byteReverse(unsigned char *buf, size_t longs)
! 27: {
! 28: uint32_t t;
! 29: do {
! 30: t = (uint32_t)((uint16_t)(buf[3] << 8 | buf[2])) << 16 |
! 31: ((uint16_t)(buf[1] << 8 | buf[0]));
! 32: *(uint32_t *) buf = t;
! 33: buf += 4;
! 34: } while (--longs);
! 35: }
! 36:
! 37: /*
! 38: * Start MD5 accumulation. Set bit count to 0 and buffer to mysterious
! 39: * initialization constants.
! 40: */
! 41: void MD5Init(struct MD5Context *ctx)
! 42: {
! 43: ctx->buf[0] = 0x67452301;
! 44: ctx->buf[1] = 0xefcdab89;
! 45: ctx->buf[2] = 0x98badcfe;
! 46: ctx->buf[3] = 0x10325476;
! 47:
! 48: ctx->bits[0] = 0;
! 49: ctx->bits[1] = 0;
! 50: }
! 51:
! 52: /*
! 53: * Update context to reflect the concatenation of another buffer full
! 54: * of bytes.
! 55: */
! 56: void MD5Update(struct MD5Context *ctx, unsigned char const *buf, size_t len)
! 57: {
! 58: uint32_t t;
! 59:
! 60: /* Update bitcount */
! 61:
! 62: t = ctx->bits[0];
! 63: if ((ctx->bits[0] = t + ((uint32_t) len << 3)) < t)
! 64: ctx->bits[1]++; /* Carry from low to high */
! 65: ctx->bits[1] += len >> 29;
! 66:
! 67: t = (t >> 3) & 0x3f; /* Bytes already in shsInfo->data */
! 68:
! 69: /* Handle any leading odd-sized chunks */
! 70:
! 71: if (t) {
! 72: unsigned char *p = (unsigned char *) ctx->in + t;
! 73:
! 74: t = 64 - t;
! 75: if (len < t) {
! 76: memcpy(p, buf, len);
! 77: return;
! 78: }
! 79: memcpy(p, buf, t);
! 80: byteReverse(ctx->in, 16);
! 81: MD5Transform(ctx->buf, (uint32_t *) ctx->in);
! 82: buf += t;
! 83: len -= t;
! 84: }
! 85: /* Process data in 64-byte chunks */
! 86:
! 87: while (len >= 64) {
! 88: memcpy(ctx->in, buf, 64);
! 89: byteReverse(ctx->in, 16);
! 90: MD5Transform(ctx->buf, (uint32_t *) ctx->in);
! 91: buf += 64;
! 92: len -= 64;
! 93: }
! 94:
! 95: /* Handle any remaining bytes of data. */
! 96:
! 97: memcpy(ctx->in, buf, len);
! 98: }
! 99:
! 100: /*
! 101: * Final wrapup - pad to 64-byte boundary with the bit pattern
! 102: * 1 0* (64-bit count of bits processed, MSB-first)
! 103: */
! 104: void MD5Final(unsigned char digest[16], struct MD5Context *ctx)
! 105: {
! 106: size_t count;
! 107: unsigned char *p;
! 108:
! 109: /* Compute number of bytes mod 64 */
! 110: count = (ctx->bits[0] >> 3) & 0x3F;
! 111:
! 112: /* Set the first char of padding to 0x80. This is safe since there is
! 113: always at least one byte free */
! 114: p = ctx->in + count;
! 115: *p++ = 0x80;
! 116: /* Bytes of padding needed to make 64 bytes */
! 117: count = 64 - 1 - count;
! 118:
! 119: /* Pad out to 56 mod 64 */
! 120: if (count < 8) {
! 121: /* Two lots of padding: Pad the first block to 64 bytes */
! 122: memset(p, 0, count);
! 123: byteReverse(ctx->in, 16);
! 124: MD5Transform(ctx->buf, (uint32_t *) ctx->in);
! 125:
! 126: /* Now fill the next block with 56 bytes */
! 127: memset(ctx->in, 0, 56);
! 128: } else {
! 129: /* Pad block to 56 bytes */
! 130: memset(p, 0, count - 8);
! 131: }
! 132: byteReverse(ctx->in, 14);
! 133:
! 134: /* Append length in bits and transform */
! 135: ((uint32_t *) ctx->in)[14] = ctx->bits[0];
! 136: ((uint32_t *) ctx->in)[15] = ctx->bits[1];
! 137:
! 138: MD5Transform(ctx->buf, (uint32_t *) ctx->in);
! 139: byteReverse((unsigned char *) ctx->buf, 4);
! 140: memcpy(digest, ctx->buf, 16);
! 141: memset(ctx, 0, sizeof(ctx)); /* In case it's sensitive */
! 142: }
! 143:
! 144: /* The four core functions - F1 is optimized somewhat */
! 145:
! 146: /* #define F1(x, y, z) (x & y | ~x & z) */
! 147: #define F1(x, y, z) (z ^ (x & (y ^ z)))
! 148: #define F2(x, y, z) F1(z, x, y)
! 149: #define F3(x, y, z) (x ^ y ^ z)
! 150: #define F4(x, y, z) (y ^ (x | ~z))
! 151:
! 152: /* This is the central step in the MD5 algorithm. */
! 153: #define MD5STEP(f, w, x, y, z, data, s) \
! 154: ( w += f(x, y, z) + data, w = w<<s | w>>(32-s), w += x )
! 155:
! 156: /*
! 157: * The core of the MD5 algorithm, this alters an existing MD5 hash to
! 158: * reflect the addition of 16 longwords of new data. MD5Update blocks
! 159: * the data and converts bytes into longwords for this routine.
! 160: */
! 161: void MD5Transform(uint32_t buf[4], uint32_t const in[16])
! 162: {
! 163: register uint32_t a, b, c, d;
! 164:
! 165: a = buf[0];
! 166: b = buf[1];
! 167: c = buf[2];
! 168: d = buf[3];
! 169:
! 170: MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
! 171: MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
! 172: MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
! 173: MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
! 174: MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
! 175: MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
! 176: MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
! 177: MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
! 178: MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
! 179: MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
! 180: MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
! 181: MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
! 182: MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
! 183: MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
! 184: MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
! 185: MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
! 186:
! 187: MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
! 188: MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
! 189: MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
! 190: MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
! 191: MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
! 192: MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
! 193: MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
! 194: MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
! 195: MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
! 196: MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
! 197: MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
! 198: MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
! 199: MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
! 200: MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
! 201: MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
! 202: MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
! 203:
! 204: MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
! 205: MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
! 206: MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
! 207: MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
! 208: MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
! 209: MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
! 210: MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
! 211: MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
! 212: MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
! 213: MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
! 214: MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
! 215: MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
! 216: MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
! 217: MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
! 218: MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
! 219: MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
! 220:
! 221: MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
! 222: MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
! 223: MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
! 224: MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
! 225: MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
! 226: MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
! 227: MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
! 228: MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
! 229: MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
! 230: MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
! 231: MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
! 232: MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
! 233: MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
! 234: MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
! 235: MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
! 236: MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
! 237:
! 238: buf[0] += a;
! 239: buf[1] += b;
! 240: buf[2] += c;
! 241: buf[3] += d;
! 242: }
! 243:
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