text: /*	$KAME: des_enc.c,v 1.1 2001/09/10 04:03:58 itojun Exp $	*/
  /*	$FreeBSD: src/sys/crypto/des/des_enc.c,v 1.2 2004/06/14 00:38:54 obrien Exp $	*/
  
  /* crypto/des/des_enc.c */
  
  /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   * All rights reserved.
   *
   * This package is an SSL implementation written
   * by Eric Young (eay@cryptsoft.com).
   * 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@cryptsoft.com).
   * 
   * 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@cryptsoft.com)"
   *    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@cryptsoft.com)"
   * 
   * 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 <sys/types.h>
  #include <crypto/des/des_locl.h>
  
  extern	const DES_LONG des_SPtrans[8][64];
  
  void des_encrypt1(DES_LONG *data, des_key_schedule ks, int enc)
  {
  	DES_LONG l,r,t,u;
  #ifdef DES_PTR
  	const unsigned char *des_SP=(const unsigned char *)des_SPtrans;
  #endif
  #ifndef DES_UNROLL
  	int i;
  #endif
  	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=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)
  {
  	DES_LONG l,r,t,u;
  #ifdef DES_PTR
  	const unsigned char *des_SP=(const unsigned char *)des_SPtrans;
  #endif
  #ifndef DES_UNROLL
  	int i;
  #endif
  	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)&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)
  {
  	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)
  {
  	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;
  }
  