md5.c

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static char rcsid[] = "md5.c,v 1.5 1996/01/04 04:10:47 duane Exp";
/* md5.c,v 1.5 1996/01/04 04:10:47 duane 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                                 **
 ** Revised: Darren Hardy, [e-mail], April 1994          **
 **   -- Added get_md5() for simple MD5 computation
 ***********************************************************************
 */

/*
 ***********************************************************************
 ** 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 <stdio.h>
#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) ********************************
 */
/* 
 *  md5util.c - object an MD5 for a file
 *
 *  Based on md5driver.c from RSA Data Security, Inc. (see below)
 *
 *  Darren Hardy, [e-mail], March 1994
 */

/* md5driver.c,v 3.1 1993/07/06 01:05:07 jbj Exp
 ***********************************************************************
 ** md5driver.c -- sample test routines                               **
 ** RSA Data Security, Inc. MD5 Message-Digest Algorithm              **
 ** Created: 2/16/90 RLR                                              **
 ** Updated: 1/91 SRD                                                 **
 ** Updated: 7/91 SRD Removed file "foo" from test suite              **
 ***********************************************************************
 */

/*
 ***********************************************************************
 ** Copyright (C) 1990, RSA Data Security, Inc. All rights reserved.  **
 **                                                                   **
 ** 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.                                    **
 ***********************************************************************
 */


/* 
 *  get_md5() - Computes the message digest for a specified file.  Returns 
 *  the 32 hexadecimal version of the message digest; or NULL on error.
 */
char *get_md5(filename)
     char *filename;
{
	static char *s = NULL;
	MD5_CTX mdContext;
	int bytes, i;
	unsigned char data[BUFSIZ];
	FILE *fp;
	extern char *malloc();
	extern void free();

	/* Initialize file and md5 buffer */
	if ((s = (char *) malloc(32 + 1)) == NULL)
		return (NULL);
	if ((fp = fopen(filename, "rb")) == NULL) {
		free(s);
		return (NULL);
	}
	/* Compute the MD5 value */
	MD5Init(&mdContext);
	while ((bytes = fread(data, 1, BUFSIZ, fp)) > 0) {
		MD5Update(&mdContext, data, bytes);
	}
	MD5Final(&mdContext);
	fclose(fp);

	/* Write the MD5 as a hexadecimal number */
	for (i = 0; i < 16; i++)
		sprintf(&s[i * 2], "%02x", mdContext.digest[i]);
	s[32] = '\0';
	return (s);
}


/* 
 *  get_md5_string() - Computes the message digest for a specified string.  
 *  Returns the 32 hexadecimal version of the message digest; or NULL on error.
 */
char *get_md5_string(data, datalen)
     char *data;
     int datalen;
{
	static char *s = NULL;
	MD5_CTX mdContext;
	int i;
	extern char *malloc();

	/* Initialize file and md5 buffer */
	if ((s = (char *) malloc(32 + 1)) == NULL)
		return (NULL);

	/* Compute the MD5 value */
	MD5Init(&mdContext);
	MD5Update(&mdContext, data, datalen);
	MD5Final(&mdContext);

	/* Write the MD5 as a hexadecimal number */
	for (i = 0; i < 16; i++)
		sprintf(&s[i * 2], "%02x", mdContext.digest[i]);
	s[32] = '\0';
	return (s);
}