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/*
***********************************************************************
** md5.c -- the source code for MD5 routines **
** RSA Data Security, Inc. MD5 Message-Digest Algorithm **
** Created: 2/17/90 RLR **
** Revised: 1/91 SRD,AJ,BSK,JT Reference C ver., 7/10 constant corr. **
***********************************************************************
*/
/*
***********************************************************************
** Copyright (C) 1990, RSA Data Security, Inc. 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 "md5.h"
/*
***********************************************************************
** Message-digest routines: **
** To form the message digest for a message M **
** (1) Initialize a context buffer mdContext using MD5Init **
** (2) Call MD5Update on mdContext and M **
** (3) Call MD5Final on mdContext **
** The message digest is now in mdContext->digest[0...15] **
***********************************************************************
*/
/* forward declaration */
static void Transform(UINT4 *buf, UINT4 *in);
static unsigned char PADDING[64] = {
0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
/* 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) >> (32-(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); \
}
/* The routine MD5Init initializes the message-digest context
mdContext. All fields are set to zero.
*/
void MD5Init(MD5_CTX *mdContext)
{
mdContext->i[0] = mdContext->i[1] = (UINT4)0;
/* Load magic initialization constants.
*/
mdContext->buf[0] = (UINT4)0x67452301;
mdContext->buf[1] = (UINT4)0xefcdab89;
mdContext->buf[2] = (UINT4)0x98badcfe;
mdContext->buf[3] = (UINT4)0x10325476;
}
/* The routine MD5Update updates the message-digest context to
account for the presence of each of the characters inBuf[0..inLen-1]
in the message whose digest is being computed.
*/
void MD5Update(MD5_CTX *mdContext, unsigned char *inBuf, unsigned int inLen)
{
UINT4 in[16];
int mdi;
unsigned int i, ii;
/* compute number of bytes mod 64 */
mdi = (int)((mdContext->i[0] >> 3) & 0x3F);
/* update number of bits */
if ((mdContext->i[0] + ((UINT4)inLen << 3)) < mdContext->i[0])
mdContext->i[1]++;
mdContext->i[0] += ((UINT4)inLen << 3);
mdContext->i[1] += ((UINT4)inLen >> 29);
while (inLen--) {
/* add new character to buffer, increment mdi */
mdContext->in[mdi++] = *inBuf++;
/* transform if necessary */
if (mdi == 0x40) {
for (i = 0, ii = 0; i < 16; i++, ii += 4)
in[i] = (((UINT4)mdContext->in[ii+3]) << 24) |
(((UINT4)mdContext->in[ii+2]) << 16) |
(((UINT4)mdContext->in[ii+1]) << 8) |
((UINT4)mdContext->in[ii]);
Transform (mdContext->buf, in);
mdi = 0;
}
}
}
/* The routine MD5Final terminates the message-digest computation and
ends with the desired message digest in mdContext->digest[0...15].
*/
void MD5Final(MD5_CTX *mdContext)
{
UINT4 in[16];
int mdi;
unsigned int i, ii;
unsigned int padLen;
/* save number of bits */
in[14] = mdContext->i[0];
in[15] = mdContext->i[1];
/* compute number of bytes mod 64 */
mdi = (int)((mdContext->i[0] >> 3) & 0x3F);
/* pad out to 56 mod 64 */
padLen = (mdi < 56) ? (56 - mdi) : (120 - mdi);
MD5Update (mdContext, PADDING, padLen);
/* append length in bits and transform */
for (i = 0, ii = 0; i < 14; i++, ii += 4)
in[i] = (((UINT4)mdContext->in[ii+3]) << 24) |
(((UINT4)mdContext->in[ii+2]) << 16) |
(((UINT4)mdContext->in[ii+1]) << 8) |
((UINT4)mdContext->in[ii]);
Transform (mdContext->buf, in);
/* store buffer in digest */
for (i = 0, ii = 0; i < 4; i++, ii += 4) {
mdContext->digest[ii] = (unsigned char)(mdContext->buf[i] & 0xFF);
mdContext->digest[ii+1] =
(unsigned char)((mdContext->buf[i] >> 8) & 0xFF);
mdContext->digest[ii+2] =
(unsigned char)((mdContext->buf[i] >> 16) & 0xFF);
mdContext->digest[ii+3] =
(unsigned char)((mdContext->buf[i] >> 24) & 0xFF);
}
}
/* Basic MD5 step. Transforms buf based on in.
*/
static void Transform(UINT4 *buf, UINT4 *in)
{
UINT4 a = buf[0], b = buf[1], c = buf[2], d = buf[3];
/* Round 1 */
#define S11 7
#define S12 12
#define S13 17
#define S14 22
FF ( a, b, c, d, in[ 0], S11, 3614090360UL); /* 1 */
FF ( d, a, b, c, in[ 1], S12, 3905402710UL); /* 2 */
FF ( c, d, a, b, in[ 2], S13, 606105819UL); /* 3 */
FF ( b, c, d, a, in[ 3], S14, 3250441966UL); /* 4 */
FF ( a, b, c, d, in[ 4], S11, 4118548399UL); /* 5 */
FF ( d, a, b, c, in[ 5], S12, 1200080426UL); /* 6 */
FF ( c, d, a, b, in[ 6], S13, 2821735955UL); /* 7 */
FF ( b, c, d, a, in[ 7], S14, 4249261313UL); /* 8 */
FF ( a, b, c, d, in[ 8], S11, 1770035416UL); /* 9 */
FF ( d, a, b, c, in[ 9], S12, 2336552879UL); /* 10 */
FF ( c, d, a, b, in[10], S13, 4294925233UL); /* 11 */
FF ( b, c, d, a, in[11], S14, 2304563134UL); /* 12 */
FF ( a, b, c, d, in[12], S11, 1804603682UL); /* 13 */
FF ( d, a, b, c, in[13], S12, 4254626195UL); /* 14 */
FF ( c, d, a, b, in[14], S13, 2792965006UL); /* 15 */
FF ( b, c, d, a, in[15], S14, 1236535329UL); /* 16 */
/* Round 2 */
#define S21 5
#define S22 9
#define S23 14
#define S24 20
GG ( a, b, c, d, in[ 1], S21, 4129170786UL); /* 17 */
GG ( d, a, b, c, in[ 6], S22, 3225465664UL); /* 18 */
GG ( c, d, a, b, in[11], S23, 643717713UL); /* 19 */
GG ( b, c, d, a, in[ 0], S24, 3921069994UL); /* 20 */
GG ( a, b, c, d, in[ 5], S21, 3593408605UL); /* 21 */
GG ( d, a, b, c, in[10], S22, 38016083UL); /* 22 */
GG ( c, d, a, b, in[15], S23, 3634488961UL); /* 23 */
GG ( b, c, d, a, in[ 4], S24, 3889429448UL); /* 24 */
GG ( a, b, c, d, in[ 9], S21, 568446438UL); /* 25 */
GG ( d, a, b, c, in[14], S22, 3275163606UL); /* 26 */
GG ( c, d, a, b, in[ 3], S23, 4107603335UL); /* 27 */
GG ( b, c, d, a, in[ 8], S24, 1163531501UL); /* 28 */
GG ( a, b, c, d, in[13], S21, 2850285829UL); /* 29 */
GG ( d, a, b, c, in[ 2], S22, 4243563512UL); /* 30 */
GG ( c, d, a, b, in[ 7], S23, 1735328473UL); /* 31 */
GG ( b, c, d, a, in[12], S24, 2368359562UL); /* 32 */
/* Round 3 */
#define S31 4
#define S32 11
#define S33 16
#define S34 23
HH ( a, b, c, d, in[ 5], S31, 4294588738UL); /* 33 */
HH ( d, a, b, c, in[ 8], S32, 2272392833UL); /* 34 */
HH ( c, d, a, b, in[11], S33, 1839030562UL); /* 35 */
HH ( b, c, d, a, in[14], S34, 4259657740UL); /* 36 */
HH ( a, b, c, d, in[ 1], S31, 2763975236UL); /* 37 */
HH ( d, a, b, c, in[ 4], S32, 1272893353UL); /* 38 */
HH ( c, d, a, b, in[ 7], S33, 4139469664UL); /* 39 */
HH ( b, c, d, a, in[10], S34, 3200236656UL); /* 40 */
HH ( a, b, c, d, in[13], S31, 681279174UL); /* 41 */
HH ( d, a, b, c, in[ 0], S32, 3936430074UL); /* 42 */
HH ( c, d, a, b, in[ 3], S33, 3572445317UL); /* 43 */
HH ( b, c, d, a, in[ 6], S34, 76029189UL); /* 44 */
HH ( a, b, c, d, in[ 9], S31, 3654602809UL); /* 45 */
HH ( d, a, b, c, in[12], S32, 3873151461UL); /* 46 */
HH ( c, d, a, b, in[15], S33, 530742520UL); /* 47 */
HH ( b, c, d, a, in[ 2], S34, 3299628645UL); /* 48 */
/* Round 4 */
#define S41 6
#define S42 10
#define S43 15
#define S44 21
II ( a, b, c, d, in[ 0], S41, 4096336452UL); /* 49 */
II ( d, a, b, c, in[ 7], S42, 1126891415UL); /* 50 */
II ( c, d, a, b, in[14], S43, 2878612391UL); /* 51 */
II ( b, c, d, a, in[ 5], S44, 4237533241UL); /* 52 */
II ( a, b, c, d, in[12], S41, 1700485571UL); /* 53 */
II ( d, a, b, c, in[ 3], S42, 2399980690UL); /* 54 */
II ( c, d, a, b, in[10], S43, 4293915773UL); /* 55 */
II ( b, c, d, a, in[ 1], S44, 2240044497UL); /* 56 */
II ( a, b, c, d, in[ 8], S41, 1873313359UL); /* 57 */
II ( d, a, b, c, in[15], S42, 4264355552UL); /* 58 */
II ( c, d, a, b, in[ 6], S43, 2734768916UL); /* 59 */
II ( b, c, d, a, in[13], S44, 1309151649UL); /* 60 */
II ( a, b, c, d, in[ 4], S41, 4149444226UL); /* 61 */
II ( d, a, b, c, in[11], S42, 3174756917UL); /* 62 */
II ( c, d, a, b, in[ 2], S43, 718787259UL); /* 63 */
II ( b, c, d, a, in[ 9], S44, 3951481745UL); /* 64 */
buf[0] += a;
buf[1] += b;
buf[2] += c;
buf[3] += d;
}
/*
***********************************************************************
** End of md5.c **
******************************** (cut) ********************************
*/
|
