md5_dgst.c

本代码是C语言实现的MD5算法的源代码。MD5和SHA1是目前最为常用的HASH算法

/* crypto/md5/md5_dgst.c */
/* Copyright (C) 1995-1998 Eric Young ([e-mail])
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young ([e-mail]).
 * The implementation was written so as to conform with Netscapes SSL.
 * 
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson ([e-mail]).
 * 
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young ([e-mail])"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from 
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson ([e-mail])"
 * 
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * 
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */

#include <stdio.h>
#include "md5_locl.h"
#include <openssl/opensslv.h>

const char MD5_version[]="MD5" OPENSSL_VERSION_PTEXT;

/* Implemented from RFC1321 The MD5 Message-Digest Algorithm
 */

#define INIT_DATA_A (unsigned long)0x67452301L
#define INIT_DATA_B (unsigned long)0xefcdab89L
#define INIT_DATA_C (unsigned long)0x98badcfeL
#define INIT_DATA_D (unsigned long)0x10325476L

int MD5_Init(MD5_CTX *c)
	{
	c->A=INIT_DATA_A;
	c->B=INIT_DATA_B;
	c->C=INIT_DATA_C;
	c->D=INIT_DATA_D;
	c->Nl=0;
	c->Nh=0;
	c->num=0;
	return 1;
	}

#ifndef md5_block_host_order
void md5_block_host_order (MD5_CTX *c, const void *data, size_t num)
	{
	const MD5_LONG *X=data;
	register unsigned MD32_REG_T A,B,C,D;

	A=c->A;
	B=c->B;
	C=c->C;
	D=c->D;

	for (;num--;X+=HASH_LBLOCK)
		{
	/* Round 0 */
	R0(A,B,C,D,X[ 0], 7,0xd76aa478L);
	R0(D,A,B,C,X[ 1],12,0xe8c7b756L);
	R0(C,D,A,B,X[ 2],17,0x242070dbL);
	R0(B,C,D,A,X[ 3],22,0xc1bdceeeL);
	R0(A,B,C,D,X[ 4], 7,0xf57c0fafL);
	R0(D,A,B,C,X[ 5],12,0x4787c62aL);
	R0(C,D,A,B,X[ 6],17,0xa8304613L);
	R0(B,C,D,A,X[ 7],22,0xfd469501L);
	R0(A,B,C,D,X[ 8], 7,0x698098d8L);
	R0(D,A,B,C,X[ 9],12,0x8b44f7afL);
	R0(C,D,A,B,X[10],17,0xffff5bb1L);
	R0(B,C,D,A,X[11],22,0x895cd7beL);
	R0(A,B,C,D,X[12], 7,0x6b901122L);
	R0(D,A,B,C,X[13],12,0xfd987193L);
	R0(C,D,A,B,X[14],17,0xa679438eL);
	R0(B,C,D,A,X[15],22,0x49b40821L);
	/* Round 1 */
	R1(A,B,C,D,X[ 1], 5,0xf61e2562L);
	R1(D,A,B,C,X[ 6], 9,0xc040b340L);
	R1(C,D,A,B,X[11],14,0x265e5a51L);
	R1(B,C,D,A,X[ 0],20,0xe9b6c7aaL);
	R1(A,B,C,D,X[ 5], 5,0xd62f105dL);
	R1(D,A,B,C,X[10], 9,0x02441453L);
	R1(C,D,A,B,X[15],14,0xd8a1e681L);
	R1(B,C,D,A,X[ 4],20,0xe7d3fbc8L);
	R1(A,B,C,D,X[ 9], 5,0x21e1cde6L);
	R1(D,A,B,C,X[14], 9,0xc33707d6L);
	R1(C,D,A,B,X[ 3],14,0xf4d50d87L);
	R1(B,C,D,A,X[ 8],20,0x455a14edL);
	R1(A,B,C,D,X[13], 5,0xa9e3e905L);
	R1(D,A,B,C,X[ 2], 9,0xfcefa3f8L);
	R1(C,D,A,B,X[ 7],14,0x676f02d9L);
	R1(B,C,D,A,X[12],20,0x8d2a4c8aL);
	/* Round 2 */
	R2(A,B,C,D,X[ 5], 4,0xfffa3942L);
	R2(D,A,B,C,X[ 8],11,0x8771f681L);
	R2(C,D,A,B,X[11],16,0x6d9d6122L);
	R2(B,C,D,A,X[14],23,0xfde5380cL);
	R2(A,B,C,D,X[ 1], 4,0xa4beea44L);
	R2(D,A,B,C,X[ 4],11,0x4bdecfa9L);
	R2(C,D,A,B,X[ 7],16,0xf6bb4b60L);
	R2(B,C,D,A,X[10],23,0xbebfbc70L);
	R2(A,B,C,D,X[13], 4,0x289b7ec6L);
	R2(D,A,B,C,X[ 0],11,0xeaa127faL);
	R2(C,D,A,B,X[ 3],16,0xd4ef3085L);
	R2(B,C,D,A,X[ 6],23,0x04881d05L);
	R2(A,B,C,D,X[ 9], 4,0xd9d4d039L);
	R2(D,A,B,C,X[12],11,0xe6db99e5L);
	R2(C,D,A,B,X[15],16,0x1fa27cf8L);
	R2(B,C,D,A,X[ 2],23,0xc4ac5665L);
	/* Round 3 */
	R3(A,B,C,D,X[ 0], 6,0xf4292244L);
	R3(D,A,B,C,X[ 7],10,0x432aff97L);
	R3(C,D,A,B,X[14],15,0xab9423a7L);
	R3(B,C,D,A,X[ 5],21,0xfc93a039L);
	R3(A,B,C,D,X[12], 6,0x655b59c3L);
	R3(D,A,B,C,X[ 3],10,0x8f0ccc92L);
	R3(C,D,A,B,X[10],15,0xffeff47dL);
	R3(B,C,D,A,X[ 1],21,0x85845dd1L);
	R3(A,B,C,D,X[ 8], 6,0x6fa87e4fL);
	R3(D,A,B,C,X[15],10,0xfe2ce6e0L);
	R3(C,D,A,B,X[ 6],15,0xa3014314L);
	R3(B,C,D,A,X[13],21,0x4e0811a1L);
	R3(A,B,C,D,X[ 4], 6,0xf7537e82L);
	R3(D,A,B,C,X[11],10,0xbd3af235L);
	R3(C,D,A,B,X[ 2],15,0x2ad7d2bbL);
	R3(B,C,D,A,X[ 9],21,0xeb86d391L);

	A = c->A += A;
	B = c->B += B;
	C = c->C += C;
	D = c->D += D;
		}
	}
#endif

#ifndef md5_block_data_order
#ifdef X
#undef X
#endif
void md5_block_data_order (MD5_CTX *c, const void *data_, size_t num)
	{
	const unsigned char *data=data_;
	register unsigned MD32_REG_T A,B,C,D,l;
#ifndef MD32_XARRAY
	/* See comment in crypto/sha/sha_locl.h for details. */
	unsigned MD32_REG_T	XX0, XX1, XX2, XX3, XX4, XX5, XX6, XX7,
				XX8, XX9,XX10,XX11,XX12,XX13,XX14,XX15;
# define X(i)	XX##i
#else
	MD5_LONG XX[MD5_LBLOCK];
# define X(i)	XX[i]
#endif

	A=c->A;
	B=c->B;
	C=c->C;
	D=c->D;

	for (;num--;)
		{
	HOST_c2l(data,l); X( 0)=l;		HOST_c2l(data,l); X( 1)=l;
	/* Round 0 */
	R0(A,B,C,D,X( 0), 7,0xd76aa478L);	HOST_c2l(data,l); X( 2)=l;
	R0(D,A,B,C,X( 1),12,0xe8c7b756L);	HOST_c2l(data,l); X( 3)=l;
	R0(C,D,A,B,X( 2),17,0x242070dbL);	HOST_c2l(data,l); X( 4)=l;
	R0(B,C,D,A,X( 3),22,0xc1bdceeeL);	HOST_c2l(data,l); X( 5)=l;
	R0(A,B,C,D,X( 4), 7,0xf57c0fafL);	HOST_c2l(data,l); X( 6)=l;
	R0(D,A,B,C,X( 5),12,0x4787c62aL);	HOST_c2l(data,l); X( 7)=l;
	R0(C,D,A,B,X( 6),17,0xa8304613L);	HOST_c2l(data,l); X( 8)=l;
	R0(B,C,D,A,X( 7),22,0xfd469501L);	HOST_c2l(data,l); X( 9)=l;
	R0(A,B,C,D,X( 8), 7,0x698098d8L);	HOST_c2l(data,l); X(10)=l;
	R0(D,A,B,C,X( 9),12,0x8b44f7afL);	HOST_c2l(data,l); X(11)=l;
	R0(C,D,A,B,X(10),17,0xffff5bb1L);	HOST_c2l(data,l); X(12)=l;
	R0(B,C,D,A,X(11),22,0x895cd7beL);	HOST_c2l(data,l); X(13)=l;
	R0(A,B,C,D,X(12), 7,0x6b901122L);	HOST_c2l(data,l); X(14)=l;
	R0(D,A,B,C,X(13),12,0xfd987193L);	HOST_c2l(data,l); X(15)=l;
	R0(C,D,A,B,X(14),17,0xa679438eL);
	R0(B,C,D,A,X(15),22,0x49b40821L);
	/* Round 1 */
	R1(A,B,C,D,X( 1), 5,0xf61e2562L);
	R1(D,A,B,C,X( 6), 9,0xc040b340L);
	R1(C,D,A,B,X(11),14,0x265e5a51L);
	R1(B,C,D,A,X( 0),20,0xe9b6c7aaL);
	R1(A,B,C,D,X( 5), 5,0xd62f105dL);
	R1(D,A,B,C,X(10), 9,0x02441453L);
	R1(C,D,A,B,X(15),14,0xd8a1e681L);
	R1(B,C,D,A,X( 4),20,0xe7d3fbc8L);
	R1(A,B,C,D,X( 9), 5,0x21e1cde6L);
	R1(D,A,B,C,X(14), 9,0xc33707d6L);
	R1(C,D,A,B,X( 3),14,0xf4d50d87L);
	R1(B,C,D,A,X( 8),20,0x455a14edL);
	R1(A,B,C,D,X(13), 5,0xa9e3e905L);
	R1(D,A,B,C,X( 2), 9,0xfcefa3f8L);
	R1(C,D,A,B,X( 7),14,0x676f02d9L);
	R1(B,C,D,A,X(12),20,0x8d2a4c8aL);
	/* Round 2 */
	R2(A,B,C,D,X( 5), 4,0xfffa3942L);
	R2(D,A,B,C,X( 8),11,0x8771f681L);
	R2(C,D,A,B,X(11),16,0x6d9d6122L);
	R2(B,C,D,A,X(14),23,0xfde5380cL);
	R2(A,B,C,D,X( 1), 4,0xa4beea44L);
	R2(D,A,B,C,X( 4),11,0x4bdecfa9L);
	R2(C,D,A,B,X( 7),16,0xf6bb4b60L);
	R2(B,C,D,A,X(10),23,0xbebfbc70L);
	R2(A,B,C,D,X(13), 4,0x289b7ec6L);
	R2(D,A,B,C,X( 0),11,0xeaa127faL);
	R2(C,D,A,B,X( 3),16,0xd4ef3085L);
	R2(B,C,D,A,X( 6),23,0x04881d05L);
	R2(A,B,C,D,X( 9), 4,0xd9d4d039L);
	R2(D,A,B,C,X(12),11,0xe6db99e5L);
	R2(C,D,A,B,X(15),16,0x1fa27cf8L);
	R2(B,C,D,A,X( 2),23,0xc4ac5665L);
	/* Round 3 */
	R3(A,B,C,D,X( 0), 6,0xf4292244L);
	R3(D,A,B,C,X( 7),10,0x432aff97L);
	R3(C,D,A,B,X(14),15,0xab9423a7L);
	R3(B,C,D,A,X( 5),21,0xfc93a039L);
	R3(A,B,C,D,X(12), 6,0x655b59c3L);
	R3(D,A,B,C,X( 3),10,0x8f0ccc92L);
	R3(C,D,A,B,X(10),15,0xffeff47dL);
	R3(B,C,D,A,X( 1),21,0x85845dd1L);
	R3(A,B,C,D,X( 8), 6,0x6fa87e4fL);
	R3(D,A,B,C,X(15),10,0xfe2ce6e0L);
	R3(C,D,A,B,X( 6),15,0xa3014314L);
	R3(B,C,D,A,X(13),21,0x4e0811a1L);
	R3(A,B,C,D,X( 4), 6,0xf7537e82L);
	R3(D,A,B,C,X(11),10,0xbd3af235L);
	R3(C,D,A,B,X( 2),15,0x2ad7d2bbL);
	R3(B,C,D,A,X( 9),21,0xeb86d391L);

	A = c->A += A;
	B = c->B += B;
	C = c->C += C;
	D = c->D += D;
		}
	}
#endif

#ifdef undef
int printit(unsigned long *l)
	{
	int i,ii;

	for (i=0; i<2; i++)
		{
		for (ii=0; ii<8; ii++)
			{
			fprintf(stderr,"%08lx ",l[i*8+ii]);
			}
		fprintf(stderr,"\n");
		}
	}
#endif