des_enc.c

/* crypto/des/des_enc.c */
/* Copyright (C) 1995-1997 Eric Young (eay@mincom.oz.au)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@mincom.oz.au).
 * 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 (tjh@mincom.oz.au).
 * 
 * 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 (eay@mincom.oz.au)"
 *    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 (tjh@mincom.oz.au)"
 * 
 * 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 "des_locl.h"

void des_encrypt(data, ks, encrypt)
DES_LONG *data;
des_key_schedule ks;
int encrypt;
	{
	register DES_LONG l,r,t,u;
#ifdef DES_PTR
	register unsigned char *des_SP=(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 <71755.204@CompuServe.COM>
	 * 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=(DES_LONG *)ks;
	/* I don't know if it is worth the effort of loop unrolling the
	 * inner loop */
	if (encrypt)
		{
#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(data, ks, encrypt)
DES_LONG *data;
des_key_schedule ks;
int encrypt;
	{
	register DES_LONG l,r,t,u;
#ifdef DES_PTR
	register unsigned char *des_SP=(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 <71755.204@CompuServe.COM>
	 * for pointing this out. */
	/* clear the top bits on machines with 8byte longs */
	r=ROTATE(r,29)&0xffffffff;
	l=ROTATE(l,29)&0xffffffff;

	s=(DES_LONG *)ks;
	/* I don't know if it is worth the effort of loop unrolling the
	 * inner loop */
	if (encrypt)
		{
#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)&0xffffffff;
	data[1]=ROTATE(r,3)&0xffffffff;
	l=r=t=u=0;
	}

void des_encrypt3(data,ks1,ks2,ks3)
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(data,ks1,ks2,ks3)
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;
	}