Category : Files from Magazines
Archive   : DDJSEP91.ZIP
Filename : ONE_HASH.LST

_ONE-WAY HASH FUNCTIONS_
by Bruce Schneier

[LISTINÇ ONE]


/***********************************************************************
** 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 **
***********************************************************************
** 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"

/* forward declaration */
static void Transform ();

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 (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 **
**********************************************************************/



[LISTINÇ TWO]


/***********************************************************************
** md5.h -- header file for implementation of MD5 **
** RSA Data Security, Inc. MD5 Message-Digest Algorithm **
** Created: 2/17/90 RLR **
** Revised: 12/27/90 SRD,AJ,BSK,JT Reference C version **
** Revised (for MD5): RLR 4/27/91 **
**********************************************************************/
/* typedef a 32-bit type */
typedef unsigned long int UINT4;

/* Data structure for MD5 (Message-Digest) computation */
typedef struct {
UINT4 i[2]; /* number of _bits_ handled mod 2^64 */
UINT4 buf[4]; /* scratch buffer */
unsigned char in[64]; /* input buffer */
unsigned char digest[16]; /* actual digest after MD5Final call */
} MD5_CTX;

void MD5Init ();
void MD5Update ();
void MD5Final ();

/***********************************************************************
** End of md5.h **
**********************************************************************/