Annotation of embedaddon/bird2/lib/md5.c, revision 1.1
1.1 ! misho 1: /*
! 2: * BIRD Library -- MD5 Hash Function and HMAC-MD5 Function
! 3: *
! 4: * (c) 2015 CZ.NIC z.s.p.o.
! 5: *
! 6: * The code was written by Colin Plumb in 1993, no copyright is claimed.
! 7: *
! 8: * Adapted for BIRD by Martin Mares <mj@ucw.cz>
! 9: *
! 10: * Can be freely distributed and used under the terms of the GNU GPL.
! 11: */
! 12:
! 13: #include "lib/md5.h"
! 14:
! 15: #ifdef CPU_LITTLE_ENDIAN
! 16: #define byteReverse(buf, len) /* Nothing */
! 17: #else
! 18: void byteReverse(byte *buf, uint longs);
! 19:
! 20: /*
! 21: * Note: this code is harmless on little-endian machines.
! 22: */
! 23: void byteReverse(byte *buf, uint longs)
! 24: {
! 25: u32 t;
! 26: do {
! 27: t = (u32) ((uint) buf[3] << 8 | buf[2]) << 16 |
! 28: ((uint) buf[1] << 8 | buf[0]);
! 29: *(u32 *) buf = t;
! 30: buf += 4;
! 31: } while (--longs);
! 32: }
! 33: #endif
! 34:
! 35: static void md5_transform(u32 buf[4], u32 const in[16]);
! 36:
! 37: /*
! 38: * Start MD5 accumulation. Set bit count to 0 and buffer to mysterious
! 39: * initialization constants.
! 40: */
! 41: void
! 42: md5_init(struct hash_context *CTX)
! 43: {
! 44: struct md5_context *ctx = (void *) CTX;
! 45:
! 46: ctx->buf[0] = 0x67452301;
! 47: ctx->buf[1] = 0xefcdab89;
! 48: ctx->buf[2] = 0x98badcfe;
! 49: ctx->buf[3] = 0x10325476;
! 50:
! 51: ctx->bits[0] = 0;
! 52: ctx->bits[1] = 0;
! 53: }
! 54:
! 55: /*
! 56: * Update context to reflect the concatenation of another buffer full
! 57: * of bytes.
! 58: */
! 59: void
! 60: md5_update(struct hash_context *CTX, const byte *buf, uint len)
! 61: {
! 62: struct md5_context *ctx = (void *) CTX;
! 63: u32 t;
! 64:
! 65: /* Update bitcount */
! 66:
! 67: t = ctx->bits[0];
! 68: if ((ctx->bits[0] = t + ((u32) len << 3)) < t)
! 69: ctx->bits[1]++; /* Carry from low to high */
! 70: ctx->bits[1] += len >> 29;
! 71:
! 72: t = (t >> 3) & 0x3f; /* Bytes already in shsInfo->data */
! 73:
! 74: /* Handle any leading odd-sized chunks */
! 75: if (t)
! 76: {
! 77: byte *p = (byte *) ctx->in + t;
! 78:
! 79: t = 64 - t;
! 80: if (len < t)
! 81: {
! 82: memcpy(p, buf, len);
! 83: return;
! 84: }
! 85: memcpy(p, buf, t);
! 86: byteReverse(ctx->in, 16);
! 87: md5_transform(ctx->buf, (u32 *) ctx->in);
! 88: buf += t;
! 89: len -= t;
! 90: }
! 91:
! 92: /* Process data in 64-byte chunks */
! 93: while (len >= 64)
! 94: {
! 95: memcpy(ctx->in, buf, 64);
! 96: byteReverse(ctx->in, 16);
! 97: md5_transform(ctx->buf, (u32 *) ctx->in);
! 98: buf += 64;
! 99: len -= 64;
! 100: }
! 101:
! 102: /* Handle any remaining bytes of data. */
! 103: memcpy(ctx->in, buf, len);
! 104: }
! 105:
! 106: /*
! 107: * Final wrapup - pad to 64-byte boundary with the bit pattern
! 108: * 1 0* (64-bit count of bits processed, MSB-first)
! 109: */
! 110: byte *
! 111: md5_final(struct hash_context *CTX)
! 112: {
! 113: struct md5_context *ctx = (void *) CTX;
! 114: uint count;
! 115: byte *p;
! 116:
! 117: /* Compute number of bytes mod 64 */
! 118: count = (ctx->bits[0] >> 3) & 0x3F;
! 119:
! 120: /* Set the first char of padding to 0x80. This is safe since there is
! 121: always at least one byte free */
! 122: p = ctx->in + count;
! 123: *p++ = 0x80;
! 124:
! 125: /* Bytes of padding needed to make 64 bytes */
! 126: count = 64 - 1 - count;
! 127:
! 128: /* Pad out to 56 mod 64 */
! 129: if (count < 8)
! 130: {
! 131: /* Two lots of padding: Pad the first block to 64 bytes */
! 132: memset(p, 0, count);
! 133: byteReverse(ctx->in, 16);
! 134: md5_transform(ctx->buf, (u32 *) ctx->in);
! 135:
! 136: /* Now fill the next block with 56 bytes */
! 137: memset(ctx->in, 0, 56);
! 138: }
! 139: else
! 140: {
! 141: /* Pad block to 56 bytes */
! 142: memset(p, 0, count - 8);
! 143: }
! 144: byteReverse(ctx->in, 14);
! 145:
! 146: /* Append length in bits and transform */
! 147: ((u32 *) ctx->in)[14] = ctx->bits[0];
! 148: ((u32 *) ctx->in)[15] = ctx->bits[1];
! 149:
! 150: md5_transform(ctx->buf, (u32 *) ctx->in);
! 151: byteReverse((byte *) ctx->buf, 4);
! 152:
! 153: return (byte*) ctx->buf;
! 154: }
! 155:
! 156: /* The four core functions - F1 is optimized somewhat */
! 157:
! 158: /* #define F1(x, y, z) (x & y | ~x & z) */
! 159: #define F1(x, y, z) (z ^ (x & (y ^ z)))
! 160: #define F2(x, y, z) F1(z, x, y)
! 161: #define F3(x, y, z) (x ^ y ^ z)
! 162: #define F4(x, y, z) (y ^ (x | ~z))
! 163:
! 164: /* This is the central step in the MD5 algorithm. */
! 165: #define MD5STEP(f, w, x, y, z, data, s) \
! 166: ( w += f(x, y, z) + data, w = w<<s | w>>(32-s), w += x )
! 167:
! 168: /*
! 169: * The core of the MD5 algorithm, this alters an existing MD5 hash to
! 170: * reflect the addition of 16 longwords of new data. MD5Update blocks
! 171: * the data and converts bytes into longwords for this routine.
! 172: */
! 173: void
! 174: md5_transform(u32 buf[4], u32 const in[16])
! 175: {
! 176: register u32 a, b, c, d;
! 177:
! 178: a = buf[0];
! 179: b = buf[1];
! 180: c = buf[2];
! 181: d = buf[3];
! 182:
! 183: MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
! 184: MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
! 185: MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
! 186: MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
! 187: MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
! 188: MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
! 189: MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
! 190: MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
! 191: MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
! 192: MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
! 193: MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
! 194: MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
! 195: MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
! 196: MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
! 197: MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
! 198: MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
! 199:
! 200: MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
! 201: MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
! 202: MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
! 203: MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
! 204: MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
! 205: MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
! 206: MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
! 207: MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
! 208: MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
! 209: MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
! 210: MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
! 211: MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
! 212: MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
! 213: MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
! 214: MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
! 215: MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
! 216:
! 217: MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
! 218: MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
! 219: MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
! 220: MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
! 221: MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
! 222: MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
! 223: MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
! 224: MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
! 225: MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
! 226: MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
! 227: MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
! 228: MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
! 229: MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
! 230: MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
! 231: MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
! 232: MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
! 233:
! 234: MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
! 235: MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
! 236: MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
! 237: MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
! 238: MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
! 239: MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
! 240: MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
! 241: MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
! 242: MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
! 243: MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
! 244: MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
! 245: MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
! 246: MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
! 247: MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
! 248: MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
! 249: MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
! 250:
! 251: buf[0] += a;
! 252: buf[1] += b;
! 253: buf[2] += c;
! 254: buf[3] += d;
! 255: }
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