desenc.c

老外写的加密库cryptlib(版本3.1)

/* crypto/des/des_enc.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.]
 */

#define CHECK_ENDIANNESS	/* One-off sanity check for osconfig.h */
#if defined( INC_ALL ) || defined( INC_CHILD )
  #include "osconfig.h"
  #include "des.h"
  #include "deslocl.h"
#else
  #include "crypt/osconfig.h"
  #include "crypt/des.h"
  #include "crypt/deslocl.h"
#endif /* Compiler-specific includes */

/* OpenSSL includes some sort of Configure-based versioning mechanism which
   includes an attribution notice in the code.  Since cryptlib doesn't use
   Configure (or the OpenSSL config), we hardcode in the following which
   should have the same effect */

char *version1="This product includes cryptographic software written by Eric Young ([e-mail])";
char *version2="This product includes software developed by the OpenSSL Project for use in the OpenSSL Toolkit. (http://www.openssl.org/)";

void des_encrypt1(DES_LONG *data, des_key_schedule ks, int enc)
	{
	register DES_LONG l,r,t,u;
#ifdef DES_PTR
	register const unsigned char *des_SP=(const unsigned char *)des_SPtrans;
#endif
#ifndef DES_UNROLL
	register int i;
#endif
	register DES_LONG *s;

	r=data[0];
	l=data[1];

	IP(r,l);
	/* Things have been modified so that the initial rotate is
	 * done outside the loop.  This required the
	 * des_SPtrans values in sp.h to be rotated 1 bit to the right.
	 * One perl script later and things have a 5% speed up on a sparc2.
	 * Thanks to Richard Outerbridge <[e-mail]>
	 * for pointing this out. */
	/* clear the top bits on machines with 8byte longs */
	/* shift left by 2 */
	r=ROTATE(r,29)&0xffffffffL;
	l=ROTATE(l,29)&0xffffffffL;

	s=ks->ks.deslong;
	/* I don't know if it is worth the effort of loop unrolling the
	 * inner loop */
	if (enc)
		{
#ifdef DES_UNROLL
		D_ENCRYPT(l,r, 0); /*  1 */
		D_ENCRYPT(r,l, 2); /*  2 */
		D_ENCRYPT(l,r, 4); /*  3 */
		D_ENCRYPT(r,l, 6); /*  4 */
		D_ENCRYPT(l,r, 8); /*  5 */
		D_ENCRYPT(r,l,10); /*  6 */
		D_ENCRYPT(l,r,12); /*  7 */
		D_ENCRYPT(r,l,14); /*  8 */
		D_ENCRYPT(l,r,16); /*  9 */
		D_ENCRYPT(r,l,18); /*  10 */
		D_ENCRYPT(l,r,20); /*  11 */
		D_ENCRYPT(r,l,22); /*  12 */
		D_ENCRYPT(l,r,24); /*  13 */
		D_ENCRYPT(r,l,26); /*  14 */
		D_ENCRYPT(l,r,28); /*  15 */
		D_ENCRYPT(r,l,30); /*  16 */
#else
		for (i=0; i<32; i+=8)
			{
			D_ENCRYPT(l,r,i+0); /*  1 */
			D_ENCRYPT(r,l,i+2); /*  2 */
			D_ENCRYPT(l,r,i+4); /*  3 */
			D_ENCRYPT(r,l,i+6); /*  4 */
			}
#endif
		}
	else
		{
#ifdef DES_UNROLL
		D_ENCRYPT(l,r,30); /* 16 */
		D_ENCRYPT(r,l,28); /* 15 */
		D_ENCRYPT(l,r,26); /* 14 */
		D_ENCRYPT(r,l,24); /* 13 */
		D_ENCRYPT(l,r,22); /* 12 */
		D_ENCRYPT(r,l,20); /* 11 */
		D_ENCRYPT(l,r,18); /* 10 */
		D_ENCRYPT(r,l,16); /*  9 */
		D_ENCRYPT(l,r,14); /*  8 */
		D_ENCRYPT(r,l,12); /*  7 */
		D_ENCRYPT(l,r,10); /*  6 */
		D_ENCRYPT(r,l, 8); /*  5 */
		D_ENCRYPT(l,r, 6); /*  4 */
		D_ENCRYPT(r,l, 4); /*  3 */
		D_ENCRYPT(l,r, 2); /*  2 */
		D_ENCRYPT(r,l, 0); /*  1 */
#else
		for (i=30; i>0; i-=8)
			{
			D_ENCRYPT(l,r,i-0); /* 16 */
			D_ENCRYPT(r,l,i-2); /* 15 */
			D_ENCRYPT(l,r,i-4); /* 14 */
			D_ENCRYPT(r,l,i-6); /* 13 */
			}
#endif
		}

	/* rotate and clear the top bits on machines with 8byte longs */
	l=ROTATE(l,3)&0xffffffffL;
	r=ROTATE(r,3)&0xffffffffL;

	FP(r,l);
	data[0]=l;
	data[1]=r;
	l=r=t=u=0;
	}

void des_encrypt2(DES_LONG *data, des_key_schedule ks, int enc)
	{
	register DES_LONG l,r,t,u;
#ifdef DES_PTR
	register const unsigned char *des_SP=(const unsigned char *)des_SPtrans;
#endif
#ifndef DES_UNROLL
	register int i;
#endif
	register DES_LONG *s;

	r=data[0];
	l=data[1];

	/* Things have been modified so that the initial rotate is
	 * done outside the loop.  This required the
	 * des_SPtrans values in sp.h to be rotated 1 bit to the right.
	 * One perl script later and things have a 5% speed up on a sparc2.
	 * Thanks to Richard Outerbridge <[e-mail]>
	 * for pointing this out. */
	/* clear the top bits on machines with 8byte longs */
	r=ROTATE(r,29)&0xffffffffL;
	l=ROTATE(l,29)&0xffffffffL;

	s=ks->ks.deslong;
	/* I don't know if it is worth the effort of loop unrolling the
	 * inner loop */
	if (enc)
		{
#ifdef DES_UNROLL
		D_ENCRYPT(l,r, 0); /*  1 */
		D_ENCRYPT(r,l, 2); /*  2 */
		D_ENCRYPT(l,r, 4); /*  3 */
		D_ENCRYPT(r,l, 6); /*  4 */
		D_ENCRYPT(l,r, 8); /*  5 */
		D_ENCRYPT(r,l,10); /*  6 */
		D_ENCRYPT(l,r,12); /*  7 */
		D_ENCRYPT(r,l,14); /*  8 */
		D_ENCRYPT(l,r,16); /*  9 */
		D_ENCRYPT(r,l,18); /*  10 */
		D_ENCRYPT(l,r,20); /*  11 */
		D_ENCRYPT(r,l,22); /*  12 */
		D_ENCRYPT(l,r,24); /*  13 */
		D_ENCRYPT(r,l,26); /*  14 */
		D_ENCRYPT(l,r,28); /*  15 */
		D_ENCRYPT(r,l,30); /*  16 */
#else
		for (i=0; i<32; i+=8)
			{
			D_ENCRYPT(l,r,i+0); /*  1 */
			D_ENCRYPT(r,l,i+2); /*  2 */
			D_ENCRYPT(l,r,i+4); /*  3 */
			D_ENCRYPT(r,l,i+6); /*  4 */
			}
#endif
		}
	else
		{
#ifdef DES_UNROLL
		D_ENCRYPT(l,r,30); /* 16 */
		D_ENCRYPT(r,l,28); /* 15 */
		D_ENCRYPT(l,r,26); /* 14 */
		D_ENCRYPT(r,l,24); /* 13 */
		D_ENCRYPT(l,r,22); /* 12 */
		D_ENCRYPT(r,l,20); /* 11 */
		D_ENCRYPT(l,r,18); /* 10 */
		D_ENCRYPT(r,l,16); /*  9 */
		D_ENCRYPT(l,r,14); /*  8 */
		D_ENCRYPT(r,l,12); /*  7 */
		D_ENCRYPT(l,r,10); /*  6 */
		D_ENCRYPT(r,l, 8); /*  5 */
		D_ENCRYPT(l,r, 6); /*  4 */
		D_ENCRYPT(r,l, 4); /*  3 */
		D_ENCRYPT(l,r, 2); /*  2 */
		D_ENCRYPT(r,l, 0); /*  1 */
#else
		for (i=30; i>0; i-=8)
			{
			D_ENCRYPT(l,r,i-0); /* 16 */
			D_ENCRYPT(r,l,i-2); /* 15 */
			D_ENCRYPT(l,r,i-4); /* 14 */
			D_ENCRYPT(r,l,i-6); /* 13 */
			}
#endif
		}
	/* rotate and clear the top bits on machines with 8byte longs */
	data[0]=ROTATE(l,3)&0xffffffffL;
	data[1]=ROTATE(r,3)&0xffffffffL;
	l=r=t=u=0;
	}

void des_encrypt3(DES_LONG *data, des_key_schedule ks1, des_key_schedule ks2,
	     des_key_schedule ks3)
	{
	register DES_LONG l,r;

	l=data[0];
	r=data[1];
	IP(l,r);
	data[0]=l;
	data[1]=r;
	des_encrypt2((DES_LONG *)data,ks1,DES_ENCRYPT);
	des_encrypt2((DES_LONG *)data,ks2,DES_DECRYPT);
	des_encrypt2((DES_LONG *)data,ks3,DES_ENCRYPT);
	l=data[0];
	r=data[1];
	FP(r,l);
	data[0]=l;
	data[1]=r;
	}

void des_decrypt3(DES_LONG *data, des_key_schedule ks1, des_key_schedule ks2,
	     des_key_schedule ks3)
	{
	register DES_LONG l,r;

	l=data[0];
	r=data[1];
	IP(l,r);
	data[0]=l;
	data[1]=r;
	des_encrypt2((DES_LONG *)data,ks3,DES_DECRYPT);
	des_encrypt2((DES_LONG *)data,ks2,DES_ENCRYPT);
	des_encrypt2((DES_LONG *)data,ks1,DES_DECRYPT);
	l=data[0];
	r=data[1];
	FP(r,l);
	data[0]=l;
	data[1]=r;
	}

#ifndef DES_DEFAULT_OPTIONS

#undef CBC_ENC_C__DONT_UPDATE_IV

void des_ede3_cbc_encrypt(const unsigned char *input, unsigned char *output,
	     long length, des_key_schedule ks1, des_key_schedule ks2,
	     des_key_schedule ks3, des_cblock *ivec, int enc)
	{
	register DES_LONG tin0,tin1;
	register DES_LONG tout0,tout1,xor0,xor1;
	register const unsigned char *in;
	unsigned char *out;
	register long l=length;
	DES_LONG tin[2];
	unsigned char *iv;

	in=input;
	out=output;
	iv = &(*ivec)[0];

	if (enc)
		{
		c2l(iv,tout0);
		c2l(iv,tout1);
		for (l-=8; l>=0; l-=8)
			{
			c2l(in,tin0);
			c2l(in,tin1);
			tin0^=tout0;
			tin1^=tout1;

			tin[0]=tin0;
			tin[1]=tin1;
			des_encrypt3((DES_LONG *)tin,ks1,ks2,ks3);
			tout0=tin[0];
			tout1=tin[1];

			l2c(tout0,out);
			l2c(tout1,out);
			}
		if (l != -8)
			{
			c2ln(in,tin0,tin1,l+8);
			tin0^=tout0;
			tin1^=tout1;

			tin[0]=tin0;
			tin[1]=tin1;
			des_encrypt3((DES_LONG *)tin,ks1,ks2,ks3);
			tout0=tin[0];
			tout1=tin[1];

			l2c(tout0,out);
			l2c(tout1,out);
			}
		iv = &(*ivec)[0];
		l2c(tout0,iv);
		l2c(tout1,iv);
		}
	else
		{
		register DES_LONG t0,t1;

		c2l(iv,xor0);
		c2l(iv,xor1);
		for (l-=8; l>=0; l-=8)
			{
			c2l(in,tin0);
			c2l(in,tin1);

			t0=tin0;
			t1=tin1;

			tin[0]=tin0;
			tin[1]=tin1;
			des_decrypt3((DES_LONG *)tin,ks1,ks2,ks3);
			tout0=tin[0];
			tout1=tin[1];

			tout0^=xor0;
			tout1^=xor1;
			l2c(tout0,out);
			l2c(tout1,out);
			xor0=t0;
			xor1=t1;
			}
		if (l != -8)
			{
			c2l(in,tin0);
			c2l(in,tin1);

			t0=tin0;
			t1=tin1;

			tin[0]=tin0;
			tin[1]=tin1;
			des_decrypt3((DES_LONG *)tin,ks1,ks2,ks3);
			tout0=tin[0];
			tout1=tin[1];

			tout0^=xor0;
			tout1^=xor1;
			l2cn(tout0,tout1,out,l+8);
			xor0=t0;
			xor1=t1;
			}

		iv = &(*ivec)[0];
		l2c(xor0,iv);
		l2c(xor1,iv);
		}
	tin0=tin1=tout0=tout1=xor0=xor1=0;
	tin[0]=tin[1]=0;
	}

#endif /* DES_DEFAULT_OPTIONS */