File: md5c.c

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   /****************************************************************
    Copyright (C) 1986-2000 by

    F6FBB - Jean-Paul ROUBELAT
    6, rue George Sand
    31120 - Roquettes - France
	jpr@f6fbb.org

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    Parts of code have been taken from many other softwares.
    Thanks for the help.
    ****************************************************************/
/* 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 "global.h"
#include "md5.h"

/* Constants for MD5Transform routine.
 */
#define S11 7
#define S12 12
#define S13 17
#define S14 22
#define S21 5
#define S22 9
#define S23 14
#define S24 20
#define S31 4
#define S32 11
#define S33 16
#define S34 23
#define S41 6
#define S42 10
#define S43 15
#define S44 21

static void MD5Transform PROTO_LIST ((UINT4[4], uchar[64]));
static void Encode PROTO_LIST
  ((uchar *, UINT4 *, unsigned int));
static void Decode PROTO_LIST
  ((UINT4 *, uchar *, unsigned int));
static void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
static void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));

static uchar 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) >> (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); \
  }

/* 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] = 0x67452301L;
	context->state[1] = 0xefcdab89L;
	context->state[2] = 0x98badcfeL;
	context->state[3] = 0x10325476L;
}

/* 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 */
	 uchar *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] >> 3) & 0x3F);

	/* Update number of bits */
	if ((context->count[0] += ((UINT4) inputLen << 3))
		< ((UINT4) inputLen << 3))
		context->count[1]++;
	context->count[1] += ((UINT4) inputLen >> 29);

	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)
	 uchar digest[16];	/* message digest */
	 MD5_CTX *context;			/* context */
{
	uchar 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] >> 3) & 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];
	 uchar 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, 0xd76aa478L);	/* 1 */
	FF (d, a, b, c, x[1], S12, 0xe8c7b756L);	/* 2 */
	FF (c, d, a, b, x[2], S13, 0x242070dbL);	/* 3 */
	FF (b, c, d, a, x[3], S14, 0xc1bdceeeL);	/* 4 */
	FF (a, b, c, d, x[4], S11, 0xf57c0fafL);	/* 5 */
	FF (d, a, b, c, x[5], S12, 0x4787c62aL);	/* 6 */
	FF (c, d, a, b, x[6], S13, 0xa8304613L);	/* 7 */
	FF (b, c, d, a, x[7], S14, 0xfd469501L);	/* 8 */
	FF (a, b, c, d, x[8], S11, 0x698098d8L);	/* 9 */
	FF (d, a, b, c, x[9], S12, 0x8b44f7afL);	/* 10 */
	FF (c, d, a, b, x[10], S13, 0xffff5bb1L);	/* 11 */
	FF (b, c, d, a, x[11], S14, 0x895cd7beL);	/* 12 */
	FF (a, b, c, d, x[12], S11, 0x6b901122L);	/* 13 */
	FF (d, a, b, c, x[13], S12, 0xfd987193L);	/* 14 */
	FF (c, d, a, b, x[14], S13, 0xa679438eL);	/* 15 */
	FF (b, c, d, a, x[15], S14, 0x49b40821L);	/* 16 */

	/* Round 2 */
	GG (a, b, c, d, x[1], S21, 0xf61e2562L);	/* 17 */
	GG (d, a, b, c, x[6], S22, 0xc040b340L);	/* 18 */
	GG (c, d, a, b, x[11], S23, 0x265e5a51L);	/* 19 */
	GG (b, c, d, a, x[0], S24, 0xe9b6c7aaL);	/* 20 */
	GG (a, b, c, d, x[5], S21, 0xd62f105dL);	/* 21 */
	GG (d, a, b, c, x[10], S22, 0x2441453L);	/* 22 */
	GG (c, d, a, b, x[15], S23, 0xd8a1e681L);	/* 23 */
	GG (b, c, d, a, x[4], S24, 0xe7d3fbc8L);	/* 24 */
	GG (a, b, c, d, x[9], S21, 0x21e1cde6L);	/* 25 */
	GG (d, a, b, c, x[14], S22, 0xc33707d6L);	/* 26 */
	GG (c, d, a, b, x[3], S23, 0xf4d50d87L);	/* 27 */
	GG (b, c, d, a, x[8], S24, 0x455a14edL);	/* 28 */
	GG (a, b, c, d, x[13], S21, 0xa9e3e905L);	/* 29 */
	GG (d, a, b, c, x[2], S22, 0xfcefa3f8L);	/* 30 */
	GG (c, d, a, b, x[7], S23, 0x676f02d9L);	/* 31 */
	GG (b, c, d, a, x[12], S24, 0x8d2a4c8aL);	/* 32 */

	/* Round 3 */
	HH (a, b, c, d, x[5], S31, 0xfffa3942L);	/* 33 */
	HH (d, a, b, c, x[8], S32, 0x8771f681L);	/* 34 */
	HH (c, d, a, b, x[11], S33, 0x6d9d6122L);	/* 35 */
	HH (b, c, d, a, x[14], S34, 0xfde5380cL);	/* 36 */
	HH (a, b, c, d, x[1], S31, 0xa4beea44L);	/* 37 */
	HH (d, a, b, c, x[4], S32, 0x4bdecfa9L);	/* 38 */
	HH (c, d, a, b, x[7], S33, 0xf6bb4b60L);	/* 39 */
	HH (b, c, d, a, x[10], S34, 0xbebfbc70L);	/* 40 */
	HH (a, b, c, d, x[13], S31, 0x289b7ec6L);	/* 41 */
	HH (d, a, b, c, x[0], S32, 0xeaa127faL);	/* 42 */
	HH (c, d, a, b, x[3], S33, 0xd4ef3085L);	/* 43 */
	HH (b, c, d, a, x[6], S34, 0x4881d05L);		/* 44 */
	HH (a, b, c, d, x[9], S31, 0xd9d4d039L);	/* 45 */
	HH (d, a, b, c, x[12], S32, 0xe6db99e5L);	/* 46 */
	HH (c, d, a, b, x[15], S33, 0x1fa27cf8L);	/* 47 */
	HH (b, c, d, a, x[2], S34, 0xc4ac5665L);	/* 48 */

	/* Round 4 */
	II (a, b, c, d, x[0], S41, 0xf4292244L);	/* 49 */
	II (d, a, b, c, x[7], S42, 0x432aff97L);	/* 50 */
	II (c, d, a, b, x[14], S43, 0xab9423a7L);	/* 51 */
	II (b, c, d, a, x[5], S44, 0xfc93a039L);	/* 52 */
	II (a, b, c, d, x[12], S41, 0x655b59c3L);	/* 53 */
	II (d, a, b, c, x[3], S42, 0x8f0ccc92L);	/* 54 */
	II (c, d, a, b, x[10], S43, 0xffeff47dL);	/* 55 */
	II (b, c, d, a, x[1], S44, 0x85845dd1L);	/* 56 */
	II (a, b, c, d, x[8], S41, 0x6fa87e4fL);	/* 57 */
	II (d, a, b, c, x[15], S42, 0xfe2ce6e0L);	/* 58 */
	II (c, d, a, b, x[6], S43, 0xa3014314L);	/* 59 */
	II (b, c, d, a, x[13], S44, 0x4e0811a1L);	/* 60 */
	II (a, b, c, d, x[4], S41, 0xf7537e82L);	/* 61 */
	II (d, a, b, c, x[11], S42, 0xbd3af235L);	/* 62 */
	II (c, d, a, b, x[2], S43, 0x2ad7d2bbL);	/* 63 */
	II (b, c, d, a, x[9], S44, 0xeb86d391L);	/* 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)
	 uchar *output;
	 UINT4 *input;
	 unsigned int len;
{
	unsigned int i, j;

	for (i = 0, j = 0; j < len; i++, j += 4)
	{
		output[j] = (uchar) (input[i] & 0xff);
		output[j + 1] = (uchar) ((input[i] >> 8) & 0xff);
		output[j + 2] = (uchar) ((input[i] >> 16) & 0xff);
		output[j + 3] = (uchar) ((input[i] >> 24) & 0xff);
	}
}

/* Decodes input (unsigned char) into output (UINT4). Assumes len is
   a multiple of 4.
 */
static void Decode (output, input, len)
	 UINT4 *output;
	 uchar *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]) << 8) |
			(((UINT4) input[j + 2]) << 16) | (((UINT4) input[j + 3]) << 24);
}

/* 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;
}