md5c.c
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上传日期:2007-01-06
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- /* @(#)md5c.c 1.2 99/12/19 Copyright 1998,1999 Heiko Eissfeldt */
- #ifndef lint
- static char sccsid[] =
- "@(#)md5c.c 1.2 99/12/19 Copyright 1998,1999 Heiko Eissfeldt";
- #endif
- /* MD5C.C - RSA Data Security, Inc., MD5 message-digest algorithm
- */
- /* Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
- rights reserved.
- License to copy and use this software is granted provided that it
- is identified as the "RSA Data Security, Inc. MD5 Message-Digest
- Algorithm" in all material mentioning or referencing this software
- or this function.
- License is also granted to make and use derivative works provided
- that such works are identified as "derived from the RSA Data
- Security, Inc. MD5 Message-Digest Algorithm" in all material
- mentioning or referencing the derived work.
- RSA Data Security, Inc. makes no representations concerning either
- the merchantability of this software or the suitability of this
- software for any particular purpose. It is provided "as is"
- without express or implied warranty of any kind.
- These notices must be retained in any copies of any part of this
- documentation and/or software.
- */
- #include "config.h"
- #include "mytype.h"
- #include "md5.h"
- /* Constants for MD5Transform routine.
- */
- #define S11 7L
- #define S12 12L
- #define S13 17L
- #define S14 22L
- #define S21 5L
- #define S22 9L
- #define S23 14L
- #define S24 20L
- #define S31 4L
- #define S32 11L
- #define S33 16L
- #define S34 23L
- #define S41 6L
- #define S42 10L
- #define S43 15L
- #define S44 21L
- typedef unsigned char * POINTER;
- static void MD5Transform __PR((UINT4 [4], unsigned char [64]));
- static void Encode __PR((unsigned char *, UINT4 *, unsigned int));
- static void Decode __PR((UINT4 *, unsigned char *, unsigned int));
- static void MD5_memcpy __PR((POINTER, POINTER, unsigned int));
- static void MD5_memset __PR((POINTER, int, unsigned int));
- static unsigned char PADDING[64] = {
- 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
- };
- /* F, G, H and I are basic MD5 functions.
- */
- #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
- #define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
- #define H(x, y, z) ((x) ^ (y) ^ (z))
- #define I(x, y, z) ((y) ^ ((x) | (~z)))
- /* ROTATE_LEFT rotates x left n bits.
- */
- #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32L-(n))))
- /* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
- Rotation is separate from addition to prevent recomputation.
- */
- #define FF(a, b, c, d, x, s, ac) {
- (a) += F ((b), (c), (d)) + (x) + (UINT4)(ac);
- (a) = ROTATE_LEFT ((a), (s));
- (a) += (b);
- }
- #define GG(a, b, c, d, x, s, ac) {
- (a) += G ((b), (c), (d)) + (x) + (UINT4)(ac);
- (a) = ROTATE_LEFT ((a), (s));
- (a) += (b);
- }
- #define HH(a, b, c, d, x, s, ac) {
- (a) += H ((b), (c), (d)) + (x) + (UINT4)(ac);
- (a) = ROTATE_LEFT ((a), (s));
- (a) += (b);
- }
- #define II(a, b, c, d, x, s, ac) {
- (a) += I ((b), (c), (d)) + (x) + (UINT4)(ac);
- (a) = ROTATE_LEFT ((a), (s));
- (a) += (b);
- }
- /* MD5 initialization. Begins an MD5 operation, writing a new context.
- */
- void MD5Init (context)
- MD5_CTX *context; /* context */
- {
- context->count[0] = context->count[1] = 0;
- /* Load magic initialization constants.
- */
- context->state[0] = UINT4_C(0x67452301);
- context->state[1] = UINT4_C(0xefcdab89);
- context->state[2] = UINT4_C(0x98badcfe);
- context->state[3] = UINT4_C(0x10325476);
- }
- /* MD5 block update operation. Continues an MD5 message-digest
- operation, processing another message block, and updating the
- context.
- */
- void MD5Update (context, input, inputLen)
- MD5_CTX *context; /* context */
- unsigned char *input; /* input block */
- unsigned int inputLen; /* length of input block */
- {
- unsigned int i, index, partLen;
- /* Compute number of bytes mod 64 */
- index = (unsigned int)((context->count[0] >> 3L) & 0x3F);
- /* Update number of bits */
- if ((context->count[0] += ((UINT4)inputLen << 3L))
- < ((UINT4)inputLen << 3L))
- context->count[1]++;
- context->count[1] += ((UINT4)inputLen >> 29L);
- partLen = 64 - index;
- /* Transform as many times as possible.
- */
- if (inputLen >= partLen) {
- MD5_memcpy
- ((POINTER)&context->buffer[index], (POINTER)input, partLen);
- MD5Transform (context->state, context->buffer);
- for (i = partLen; i + 63 < inputLen; i += 64)
- MD5Transform (context->state, &input[i]);
- index = 0;
- }
- else
- i = 0;
- /* Buffer remaining input */
- MD5_memcpy
- ((POINTER)&context->buffer[index], (POINTER)&input[i],
- inputLen-i);
- }
- /* MD5 finalization. Ends an MD5 message-digest operation, writing the
- the message digest and zeroizing the context.
- */
- void MD5Final (digest, context)
- unsigned char digest[16]; /* message digest */
- MD5_CTX *context; /* context */
- {
- unsigned char bits[8];
- unsigned int index, padLen;
- /* Save number of bits */
- Encode (bits, context->count, 8);
- /* Pad out to 56 mod 64.
- */
- index = (unsigned int)((context->count[0] >> 3L) & 0x3f);
- padLen = (index < 56) ? (56 - index) : (120 - index);
- MD5Update (context, PADDING, padLen);
- /* Append length (before padding) */
- MD5Update (context, bits, 8);
- /* Store state in digest */
- Encode (digest, context->state, 16);
- /* Zeroize sensitive information.
- */
- MD5_memset ((POINTER)context, 0, sizeof (*context));
- }
- /* MD5 basic transformation. Transforms state based on block.
- */
- static void MD5Transform (state, block)
- UINT4 state[4];
- unsigned char block[64];
- {
- UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
- Decode (x, block, 64);
- /* Round 1 */
- FF (a, b, c, d, x[ 0], S11, UINT4_C(0xd76aa478)); /* 1 */
- FF (d, a, b, c, x[ 1], S12, UINT4_C(0xe8c7b756)); /* 2 */
- FF (c, d, a, b, x[ 2], S13, UINT4_C(0x242070db)); /* 3 */
- FF (b, c, d, a, x[ 3], S14, UINT4_C(0xc1bdceee)); /* 4 */
- FF (a, b, c, d, x[ 4], S11, UINT4_C(0xf57c0faf)); /* 5 */
- FF (d, a, b, c, x[ 5], S12, UINT4_C(0x4787c62a)); /* 6 */
- FF (c, d, a, b, x[ 6], S13, UINT4_C(0xa8304613)); /* 7 */
- FF (b, c, d, a, x[ 7], S14, UINT4_C(0xfd469501)); /* 8 */
- FF (a, b, c, d, x[ 8], S11, UINT4_C(0x698098d8)); /* 9 */
- FF (d, a, b, c, x[ 9], S12, UINT4_C(0x8b44f7af)); /* 10 */
- FF (c, d, a, b, x[10], S13, UINT4_C(0xffff5bb1)); /* 11 */
- FF (b, c, d, a, x[11], S14, UINT4_C(0x895cd7be)); /* 12 */
- FF (a, b, c, d, x[12], S11, UINT4_C(0x6b901122)); /* 13 */
- FF (d, a, b, c, x[13], S12, UINT4_C(0xfd987193)); /* 14 */
- FF (c, d, a, b, x[14], S13, UINT4_C(0xa679438e)); /* 15 */
- FF (b, c, d, a, x[15], S14, UINT4_C(0x49b40821)); /* 16 */
- /* Round 2 */
- GG (a, b, c, d, x[ 1], S21, UINT4_C(0xf61e2562)); /* 17 */
- GG (d, a, b, c, x[ 6], S22, UINT4_C(0xc040b340)); /* 18 */
- GG (c, d, a, b, x[11], S23, UINT4_C(0x265e5a51)); /* 19 */
- GG (b, c, d, a, x[ 0], S24, UINT4_C(0xe9b6c7aa)); /* 20 */
- GG (a, b, c, d, x[ 5], S21, UINT4_C(0xd62f105d)); /* 21 */
- GG (d, a, b, c, x[10], S22, UINT4_C( 0x2441453)); /* 22 */
- GG (c, d, a, b, x[15], S23, UINT4_C(0xd8a1e681)); /* 23 */
- GG (b, c, d, a, x[ 4], S24, UINT4_C(0xe7d3fbc8)); /* 24 */
- GG (a, b, c, d, x[ 9], S21, UINT4_C(0x21e1cde6)); /* 25 */
- GG (d, a, b, c, x[14], S22, UINT4_C(0xc33707d6)); /* 26 */
- GG (c, d, a, b, x[ 3], S23, UINT4_C(0xf4d50d87)); /* 27 */
- GG (b, c, d, a, x[ 8], S24, UINT4_C(0x455a14ed)); /* 28 */
- GG (a, b, c, d, x[13], S21, UINT4_C(0xa9e3e905)); /* 29 */
- GG (d, a, b, c, x[ 2], S22, UINT4_C(0xfcefa3f8)); /* 30 */
- GG (c, d, a, b, x[ 7], S23, UINT4_C(0x676f02d9)); /* 31 */
- GG (b, c, d, a, x[12], S24, UINT4_C(0x8d2a4c8a)); /* 32 */
- /* Round 3 */
- HH (a, b, c, d, x[ 5], S31, UINT4_C(0xfffa3942)); /* 33 */
- HH (d, a, b, c, x[ 8], S32, UINT4_C(0x8771f681)); /* 34 */
- HH (c, d, a, b, x[11], S33, UINT4_C(0x6d9d6122)); /* 35 */
- HH (b, c, d, a, x[14], S34, UINT4_C(0xfde5380c)); /* 36 */
- HH (a, b, c, d, x[ 1], S31, UINT4_C(0xa4beea44)); /* 37 */
- HH (d, a, b, c, x[ 4], S32, UINT4_C(0x4bdecfa9)); /* 38 */
- HH (c, d, a, b, x[ 7], S33, UINT4_C(0xf6bb4b60)); /* 39 */
- HH (b, c, d, a, x[10], S34, UINT4_C(0xbebfbc70)); /* 40 */
- HH (a, b, c, d, x[13], S31, UINT4_C(0x289b7ec6)); /* 41 */
- HH (d, a, b, c, x[ 0], S32, UINT4_C(0xeaa127fa)); /* 42 */
- HH (c, d, a, b, x[ 3], S33, UINT4_C(0xd4ef3085)); /* 43 */
- HH (b, c, d, a, x[ 6], S34, UINT4_C( 0x4881d05)); /* 44 */
- HH (a, b, c, d, x[ 9], S31, UINT4_C(0xd9d4d039)); /* 45 */
- HH (d, a, b, c, x[12], S32, UINT4_C(0xe6db99e5)); /* 46 */
- HH (c, d, a, b, x[15], S33, UINT4_C(0x1fa27cf8)); /* 47 */
- HH (b, c, d, a, x[ 2], S34, UINT4_C(0xc4ac5665)); /* 48 */
- /* Round 4 */
- II (a, b, c, d, x[ 0], S41, UINT4_C(0xf4292244)); /* 49 */
- II (d, a, b, c, x[ 7], S42, UINT4_C(0x432aff97)); /* 50 */
- II (c, d, a, b, x[14], S43, UINT4_C(0xab9423a7)); /* 51 */
- II (b, c, d, a, x[ 5], S44, UINT4_C(0xfc93a039)); /* 52 */
- II (a, b, c, d, x[12], S41, UINT4_C(0x655b59c3)); /* 53 */
- II (d, a, b, c, x[ 3], S42, UINT4_C(0x8f0ccc92)); /* 54 */
- II (c, d, a, b, x[10], S43, UINT4_C(0xffeff47d)); /* 55 */
- II (b, c, d, a, x[ 1], S44, UINT4_C(0x85845dd1)); /* 56 */
- II (a, b, c, d, x[ 8], S41, UINT4_C(0x6fa87e4f)); /* 57 */
- II (d, a, b, c, x[15], S42, UINT4_C(0xfe2ce6e0)); /* 58 */
- II (c, d, a, b, x[ 6], S43, UINT4_C(0xa3014314)); /* 59 */
- II (b, c, d, a, x[13], S44, UINT4_C(0x4e0811a1)); /* 60 */
- II (a, b, c, d, x[ 4], S41, UINT4_C(0xf7537e82)); /* 61 */
- II (d, a, b, c, x[11], S42, UINT4_C(0xbd3af235)); /* 62 */
- II (c, d, a, b, x[ 2], S43, UINT4_C(0x2ad7d2bb)); /* 63 */
- II (b, c, d, a, x[ 9], S44, UINT4_C(0xeb86d391)); /* 64 */
- state[0] += a;
- state[1] += b;
- state[2] += c;
- state[3] += d;
- /* Zeroize sensitive information.
- */
- MD5_memset ((POINTER)x, 0, sizeof (x));
- }
- /* Encodes input (UINT4) into output (unsigned char). Assumes len is
- a multiple of 4.
- */
- static void Encode (output, input, len)
- unsigned char *output;
- UINT4 *input;
- unsigned int len;
- {
- unsigned int i, j;
- for (i = 0, j = 0; j < len; i++, j += 4) {
- output[j] = (unsigned char)(input[i] & 0xff);
- output[j+1] = (unsigned char)((input[i] >> 8L) & 0xff);
- output[j+2] = (unsigned char)((input[i] >> 16L) & 0xff);
- output[j+3] = (unsigned char)((input[i] >> 24L) & 0xff);
- }
- }
- /* Decodes input (unsigned char) into output (UINT4). Assumes len is
- a multiple of 4.
- */
- static void Decode (output, input, len)
- UINT4 *output;
- unsigned char *input;
- unsigned int len;
- {
- unsigned int i, j;
- for (i = 0, j = 0; j < len; i++, j += 4)
- output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8L) |
- (((UINT4)input[j+2]) << 16L) | (((UINT4)input[j+3]) << 24L);
- }
- /* Note: Replace "for loop" with standard memcpy if possible.
- */
- static void MD5_memcpy (output, input, len)
- POINTER output;
- POINTER input;
- unsigned int len;
- {
- unsigned int i;
- for (i = 0; i < len; i++)
- output[i] = input[i];
- }
- /* Note: Replace "for loop" with standard memset if possible.
- */
- static void MD5_memset (output, value, len)
- POINTER output;
- int value;
- unsigned int len;
- {
- unsigned int i;
- for (i = 0; i < len; i++)
- ((char *)output)[i] = (char)value;
- }