Annotation of embedaddon/lighttpd/src/md5.c, revision 1.1
1.1 ! misho 1: /* MD5C.C - RSA Data Security, Inc., MD5 message-digest algorithm
! 2: */
! 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:
! 26: #ifdef HAVE_CONFIG_H
! 27: # include "config.h"
! 28: #endif
! 29:
! 30: #ifndef USE_OPENSSL
! 31: #include <string.h>
! 32:
! 33: #include "md5.h"
! 34:
! 35: /* Constants for MD5Transform routine.
! 36: */
! 37:
! 38: #define S11 7
! 39: #define S12 12
! 40: #define S13 17
! 41: #define S14 22
! 42: #define S21 5
! 43: #define S22 9
! 44: #define S23 14
! 45: #define S24 20
! 46: #define S31 4
! 47: #define S32 11
! 48: #define S33 16
! 49: #define S34 23
! 50: #define S41 6
! 51: #define S42 10
! 52: #define S43 15
! 53: #define S44 21
! 54:
! 55: static void li_MD5Transform (UINT4 [4], const unsigned char [64]);
! 56: static void Encode (unsigned char *, UINT4 *, unsigned int);
! 57: static void Decode (UINT4 *, const unsigned char *, unsigned int);
! 58:
! 59: #ifdef HAVE_MEMCPY
! 60: #define MD5_memcpy(output, input, len) memcpy((output), (input), (len))
! 61: #else
! 62: static void MD5_memcpy (POINTER, POINTER, unsigned int);
! 63: #endif
! 64: #ifdef HAVE_MEMSET
! 65: #define MD5_memset(output, value, len) memset((output), (value), (len))
! 66: #else
! 67: static void MD5_memset (POINTER, int, unsigned int);
! 68: #endif
! 69:
! 70: static unsigned char PADDING[64] = {
! 71: 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
! 72: 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
! 73: 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
! 74: };
! 75:
! 76: /* F, G, H and I are basic MD5 functions.
! 77: */
! 78: #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
! 79: #define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
! 80: #define H(x, y, z) ((x) ^ (y) ^ (z))
! 81: #define I(x, y, z) ((y) ^ ((x) | (~z)))
! 82:
! 83: /* ROTATE_LEFT rotates x left n bits.
! 84: */
! 85: #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
! 86:
! 87: /* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
! 88: Rotation is separate from addition to prevent recomputation.
! 89: */
! 90: #define FF(a, b, c, d, x, s, ac) { \
! 91: (a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
! 92: (a) = ROTATE_LEFT ((a), (s)); \
! 93: (a) += (b); \
! 94: }
! 95: #define GG(a, b, c, d, x, s, ac) { \
! 96: (a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
! 97: (a) = ROTATE_LEFT ((a), (s)); \
! 98: (a) += (b); \
! 99: }
! 100: #define HH(a, b, c, d, x, s, ac) { \
! 101: (a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
! 102: (a) = ROTATE_LEFT ((a), (s)); \
! 103: (a) += (b); \
! 104: }
! 105: #define II(a, b, c, d, x, s, ac) { \
! 106: (a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
! 107: (a) = ROTATE_LEFT ((a), (s)); \
! 108: (a) += (b); \
! 109: }
! 110:
! 111: /* MD5 initialization. Begins an MD5 operation, writing a new context.
! 112: */
! 113: void li_MD5_Init (li_MD5_CTX *context)
! 114: {
! 115: context->count[0] = context->count[1] = 0;
! 116: /* Load magic initialization constants.
! 117: */
! 118: context->state[0] = 0x67452301;
! 119: context->state[1] = 0xefcdab89;
! 120: context->state[2] = 0x98badcfe;
! 121: context->state[3] = 0x10325476;
! 122: }
! 123:
! 124: /* MD5 block update operation. Continues an MD5 message-digest
! 125: operation, processing another message block, and updating the
! 126: context.
! 127: */
! 128: void li_MD5_Update (li_MD5_CTX *context, const void *_input, unsigned int inputLen)
! 129: {
! 130: unsigned int i, ndx, partLen;
! 131: const unsigned char *input = (const unsigned char*) _input;
! 132:
! 133: /* Compute number of bytes mod 64 */
! 134: ndx = (unsigned int)((context->count[0] >> 3) & 0x3F);
! 135:
! 136: /* Update number of bits */
! 137: if ((context->count[0] += ((UINT4)inputLen << 3))
! 138:
! 139: < ((UINT4)inputLen << 3))
! 140: context->count[1]++;
! 141: context->count[1] += ((UINT4)inputLen >> 29);
! 142:
! 143: partLen = 64 - ndx;
! 144:
! 145: /* Transform as many times as possible.
! 146: */
! 147: if (inputLen >= partLen) {
! 148: MD5_memcpy
! 149: ((POINTER)&context->buffer[ndx], (POINTER)input, partLen);
! 150: li_MD5Transform (context->state, context->buffer);
! 151:
! 152: for (i = partLen; i + 63 < inputLen; i += 64)
! 153: li_MD5Transform (context->state, &input[i]);
! 154:
! 155: ndx = 0;
! 156: }
! 157: else
! 158: i = 0;
! 159:
! 160: /* Buffer remaining input */
! 161: MD5_memcpy
! 162: ((POINTER)&context->buffer[ndx], (POINTER)&input[i],
! 163: inputLen-i);
! 164: }
! 165:
! 166: /* MD5 finalization. Ends an MD5 message-digest operation, writing the
! 167: the message digest and zeroizing the context.
! 168: */
! 169: void li_MD5_Final (unsigned char digest[16], li_MD5_CTX *context)
! 170: {
! 171: unsigned char bits[8];
! 172: unsigned int ndx, padLen;
! 173:
! 174: /* Save number of bits */
! 175: Encode (bits, context->count, 8);
! 176:
! 177: /* Pad out to 56 mod 64.
! 178: */
! 179: ndx = (unsigned int)((context->count[0] >> 3) & 0x3f);
! 180: padLen = (ndx < 56) ? (56 - ndx) : (120 - ndx);
! 181: li_MD5_Update (context, PADDING, padLen);
! 182:
! 183: /* Append length (before padding) */
! 184: li_MD5_Update (context, bits, 8);
! 185:
! 186: /* Store state in digest */
! 187: Encode (digest, context->state, 16);
! 188:
! 189: /* Zeroize sensitive information.
! 190: */
! 191: MD5_memset ((POINTER)context, 0, sizeof (*context));
! 192: }
! 193:
! 194: /* MD5 basic transformation. Transforms state based on block.
! 195: */
! 196: static void li_MD5Transform (UINT4 state[4], const unsigned char block[64])
! 197: {
! 198: UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
! 199:
! 200: Decode (x, block, 64);
! 201:
! 202: /* Round 1 */
! 203: FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
! 204: FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
! 205: FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
! 206: FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
! 207: FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
! 208: FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
! 209: FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
! 210: FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
! 211: FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
! 212: FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
! 213: FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
! 214: FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
! 215: FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
! 216: FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
! 217: FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
! 218: FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
! 219:
! 220: /* Round 2 */
! 221: GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
! 222: GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
! 223: GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
! 224: GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
! 225: GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
! 226: GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */
! 227: GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
! 228: GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
! 229: GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
! 230: GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
! 231: GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
! 232:
! 233: GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
! 234: GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
! 235: GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
! 236: GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
! 237: GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
! 238:
! 239: /* Round 3 */
! 240: HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
! 241: HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
! 242: HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
! 243: HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
! 244: HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
! 245: HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
! 246: HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
! 247: HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
! 248: HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
! 249: HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
! 250: HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
! 251: HH (b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */
! 252: HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
! 253: HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
! 254: HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
! 255: HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */
! 256:
! 257: /* Round 4 */
! 258: II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
! 259: II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
! 260: II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
! 261: II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
! 262: II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
! 263: II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
! 264: II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
! 265: II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
! 266: II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
! 267: II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
! 268: II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
! 269: II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
! 270: II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
! 271: II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
! 272: II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
! 273: II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */
! 274:
! 275: state[0] += a;
! 276: state[1] += b;
! 277: state[2] += c;
! 278: state[3] += d;
! 279:
! 280: /* Zeroize sensitive information.
! 281:
! 282: */
! 283: MD5_memset ((POINTER)x, 0, sizeof (x));
! 284: }
! 285:
! 286: /* Encodes input (UINT4) into output (unsigned char). Assumes len is
! 287: a multiple of 4.
! 288: */
! 289: static void Encode (unsigned char *output, UINT4 *input, unsigned int len)
! 290: {
! 291: unsigned int i, j;
! 292:
! 293: for (i = 0, j = 0; j < len; i++, j += 4) {
! 294: output[j] = (unsigned char)(input[i] & 0xff);
! 295: output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
! 296: output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
! 297: output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
! 298: }
! 299: }
! 300:
! 301: /* Decodes input (unsigned char) into output (UINT4). Assumes len is
! 302: a multiple of 4.
! 303: */
! 304: static void Decode (UINT4 *output, const unsigned char *input, unsigned int len)
! 305: {
! 306: unsigned int i, j;
! 307:
! 308: for (i = 0, j = 0; j < len; i++, j += 4)
! 309: output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) |
! 310: (((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24);
! 311: }
! 312:
! 313: /* Note: Replace "for loop" with standard memcpy if possible.
! 314: */
! 315: #ifndef HAVE_MEMCPY
! 316: static void MD5_memcpy (POINTER output, POINTER input, unsigned int len)
! 317: {
! 318: unsigned int i;
! 319:
! 320: for (i = 0; i < len; i++)
! 321:
! 322: output[i] = input[i];
! 323: }
! 324: #endif
! 325: /* Note: Replace "for loop" with standard memset if possible.
! 326: */
! 327: #ifndef HAVE_MEMSET
! 328: static void MD5_memset (POINTER output, int value, unsigned int len)
! 329: {
! 330: unsigned int i;
! 331:
! 332: for (i = 0; i < len; i++)
! 333: ((char *)output)[i] = (char)value;
! 334: }
! 335: #endif
! 336: #endif
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