323 lines
12 KiB
C
323 lines
12 KiB
C
/* md5.c,v 3.1 1993/07/06 01:08:29 jbj Exp
|
|
***********************************************************************
|
|
** 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 Version **
|
|
** Revised (for MD5): RLR 4/27/91 **
|
|
** -- G modified to have y&~z instead of y&z **
|
|
** -- FF, GG, HH modified to add in last register done **
|
|
** -- Access pattern: round 2 works mod 5, round 3 works mod 3 **
|
|
** -- distinct additive constant for each step **
|
|
** -- round 4 added, working mod 7 **
|
|
***********************************************************************
|
|
*/
|
|
|
|
/*
|
|
***********************************************************************
|
|
** 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 ();
|
|
|
|
#ifdef __STDC__
|
|
static const
|
|
#else
|
|
static
|
|
#endif
|
|
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 */
|
|
#if defined(FAST_MD5) && defined(__GNUC__) && defined(mc68000)
|
|
/*
|
|
* If we're on a 68000 based CPU and using a GNU C compiler with
|
|
* inline assembly code, we can speed this up a bit.
|
|
*/
|
|
inline UINT4 ROTATE_LEFT(UINT4 x, int n)
|
|
{
|
|
asm("roll %2,%0" : "=d" (x) : "0" (x), "Ir" (n));
|
|
return x;
|
|
}
|
|
#else
|
|
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
|
|
#endif
|
|
|
|
|
|
/* 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 (mdContext)
|
|
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 (mdContext, inBuf, inLen)
|
|
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 (mdContext)
|
|
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 (buf, in)
|
|
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, 0xd76aa478); /* 1 */
|
|
FF ( d, a, b, c, in[ 1], S12, 0xe8c7b756); /* 2 */
|
|
FF ( c, d, a, b, in[ 2], S13, 0x242070db); /* 3 */
|
|
FF ( b, c, d, a, in[ 3], S14, 0xc1bdceee); /* 4 */
|
|
FF ( a, b, c, d, in[ 4], S11, 0xf57c0faf); /* 5 */
|
|
FF ( d, a, b, c, in[ 5], S12, 0x4787c62a); /* 6 */
|
|
FF ( c, d, a, b, in[ 6], S13, 0xa8304613); /* 7 */
|
|
FF ( b, c, d, a, in[ 7], S14, 0xfd469501); /* 8 */
|
|
FF ( a, b, c, d, in[ 8], S11, 0x698098d8); /* 9 */
|
|
FF ( d, a, b, c, in[ 9], S12, 0x8b44f7af); /* 10 */
|
|
FF ( c, d, a, b, in[10], S13, 0xffff5bb1); /* 11 */
|
|
FF ( b, c, d, a, in[11], S14, 0x895cd7be); /* 12 */
|
|
FF ( a, b, c, d, in[12], S11, 0x6b901122); /* 13 */
|
|
FF ( d, a, b, c, in[13], S12, 0xfd987193); /* 14 */
|
|
FF ( c, d, a, b, in[14], S13, 0xa679438e); /* 15 */
|
|
FF ( b, c, d, a, in[15], S14, 0x49b40821); /* 16 */
|
|
|
|
/* Round 2 */
|
|
#define S21 5
|
|
#define S22 9
|
|
#define S23 14
|
|
#define S24 20
|
|
GG ( a, b, c, d, in[ 1], S21, 0xf61e2562); /* 17 */
|
|
GG ( d, a, b, c, in[ 6], S22, 0xc040b340); /* 18 */
|
|
GG ( c, d, a, b, in[11], S23, 0x265e5a51); /* 19 */
|
|
GG ( b, c, d, a, in[ 0], S24, 0xe9b6c7aa); /* 20 */
|
|
GG ( a, b, c, d, in[ 5], S21, 0xd62f105d); /* 21 */
|
|
GG ( d, a, b, c, in[10], S22, 0x2441453); /* 22 */
|
|
GG ( c, d, a, b, in[15], S23, 0xd8a1e681); /* 23 */
|
|
GG ( b, c, d, a, in[ 4], S24, 0xe7d3fbc8); /* 24 */
|
|
GG ( a, b, c, d, in[ 9], S21, 0x21e1cde6); /* 25 */
|
|
GG ( d, a, b, c, in[14], S22, 0xc33707d6); /* 26 */
|
|
GG ( c, d, a, b, in[ 3], S23, 0xf4d50d87); /* 27 */
|
|
GG ( b, c, d, a, in[ 8], S24, 0x455a14ed); /* 28 */
|
|
GG ( a, b, c, d, in[13], S21, 0xa9e3e905); /* 29 */
|
|
GG ( d, a, b, c, in[ 2], S22, 0xfcefa3f8); /* 30 */
|
|
GG ( c, d, a, b, in[ 7], S23, 0x676f02d9); /* 31 */
|
|
GG ( b, c, d, a, in[12], S24, 0x8d2a4c8a); /* 32 */
|
|
|
|
/* Round 3 */
|
|
#define S31 4
|
|
#define S32 11
|
|
#define S33 16
|
|
#define S34 23
|
|
HH ( a, b, c, d, in[ 5], S31, 0xfffa3942); /* 33 */
|
|
HH ( d, a, b, c, in[ 8], S32, 0x8771f681); /* 34 */
|
|
HH ( c, d, a, b, in[11], S33, 0x6d9d6122); /* 35 */
|
|
HH ( b, c, d, a, in[14], S34, 0xfde5380c); /* 36 */
|
|
HH ( a, b, c, d, in[ 1], S31, 0xa4beea44); /* 37 */
|
|
HH ( d, a, b, c, in[ 4], S32, 0x4bdecfa9); /* 38 */
|
|
HH ( c, d, a, b, in[ 7], S33, 0xf6bb4b60); /* 39 */
|
|
HH ( b, c, d, a, in[10], S34, 0xbebfbc70); /* 40 */
|
|
HH ( a, b, c, d, in[13], S31, 0x289b7ec6); /* 41 */
|
|
HH ( d, a, b, c, in[ 0], S32, 0xeaa127fa); /* 42 */
|
|
HH ( c, d, a, b, in[ 3], S33, 0xd4ef3085); /* 43 */
|
|
HH ( b, c, d, a, in[ 6], S34, 0x4881d05); /* 44 */
|
|
HH ( a, b, c, d, in[ 9], S31, 0xd9d4d039); /* 45 */
|
|
HH ( d, a, b, c, in[12], S32, 0xe6db99e5); /* 46 */
|
|
HH ( c, d, a, b, in[15], S33, 0x1fa27cf8); /* 47 */
|
|
HH ( b, c, d, a, in[ 2], S34, 0xc4ac5665); /* 48 */
|
|
|
|
/* Round 4 */
|
|
#define S41 6
|
|
#define S42 10
|
|
#define S43 15
|
|
#define S44 21
|
|
II ( a, b, c, d, in[ 0], S41, 0xf4292244); /* 49 */
|
|
II ( d, a, b, c, in[ 7], S42, 0x432aff97); /* 50 */
|
|
II ( c, d, a, b, in[14], S43, 0xab9423a7); /* 51 */
|
|
II ( b, c, d, a, in[ 5], S44, 0xfc93a039); /* 52 */
|
|
II ( a, b, c, d, in[12], S41, 0x655b59c3); /* 53 */
|
|
II ( d, a, b, c, in[ 3], S42, 0x8f0ccc92); /* 54 */
|
|
II ( c, d, a, b, in[10], S43, 0xffeff47d); /* 55 */
|
|
II ( b, c, d, a, in[ 1], S44, 0x85845dd1); /* 56 */
|
|
II ( a, b, c, d, in[ 8], S41, 0x6fa87e4f); /* 57 */
|
|
II ( d, a, b, c, in[15], S42, 0xfe2ce6e0); /* 58 */
|
|
II ( c, d, a, b, in[ 6], S43, 0xa3014314); /* 59 */
|
|
II ( b, c, d, a, in[13], S44, 0x4e0811a1); /* 60 */
|
|
II ( a, b, c, d, in[ 4], S41, 0xf7537e82); /* 61 */
|
|
II ( d, a, b, c, in[11], S42, 0xbd3af235); /* 62 */
|
|
II ( c, d, a, b, in[ 2], S43, 0x2ad7d2bb); /* 63 */
|
|
II ( b, c, d, a, in[ 9], S44, 0xeb86d391); /* 64 */
|
|
|
|
buf[0] += a;
|
|
buf[1] += b;
|
|
buf[2] += c;
|
|
buf[3] += d;
|
|
}
|
|
|
|
/*
|
|
***********************************************************************
|
|
** End of md5.c **
|
|
******************************** (cut) ********************************
|
|
*/
|