text: /* crypto/des/fcrypt_b.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.]
   */
  
  
  /* This version of crypt has been developed from my MIT compatible
   * DES library.
   * The library is available at pub/Crypto/DES at ftp.psy.uq.oz.au
   * Eric Young (eay@cryptsoft.com)
   */
  
  #define DES_FCRYPT
  #include "des_locl.h"
  #undef DES_FCRYPT
  #ifdef OPENSSL_SYS_WINDOWS
  #include <stdio.h>
  #endif
  
  #undef PERM_OP
  #define PERM_OP(a,b,t,n,m) ((t)=((((a)>>(n))^(b))&(m)),\
  	(b)^=(t),\
  	(a)^=((t)<<(n)))
  
  #undef HPERM_OP
  #define HPERM_OP(a,t,n,m) ((t)=((((a)<<(16-(n)))^(a))&(m)),\
  	(a)=(a)^(t)^(t>>(16-(n))))\
  
  void fcrypt_body(DES_LONG *out, DES_key_schedule *ks, DES_LONG Eswap0,
  		 DES_LONG Eswap1)
  	{
  	register DES_LONG l,r,t,u;
  #ifdef DES_PTR
  	register const unsigned char *des_SP=(const unsigned char *)DES_SPtrans;
  #endif
  	register DES_LONG *s;
  	register int j;
  	register DES_LONG E0,E1;
  
  	l=0;
  	r=0;
  
  	s=(DES_LONG *)ks;
  	E0=Eswap0;
  	E1=Eswap1;
  
  	for (j=0; j<25; j++)
  		{
  #ifndef DES_UNROLL
  		register int i;
  
  		for (i=0; i<32; i+=4)
  			{
  			D_ENCRYPT(l,r,i+0); /*  1 */
  			D_ENCRYPT(r,l,i+2); /*  2 */
  			}
  #else
  		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 */
  #endif
  
  		t=l;
  		l=r;
  		r=t;
  		}
  	l=ROTATE(l,3)&0xffffffffL;
  	r=ROTATE(r,3)&0xffffffffL;
  
  	PERM_OP(l,r,t, 1,0x55555555L);
  	PERM_OP(r,l,t, 8,0x00ff00ffL);
  	PERM_OP(l,r,t, 2,0x33333333L);
  	PERM_OP(r,l,t,16,0x0000ffffL);
  	PERM_OP(l,r,t, 4,0x0f0f0f0fL);
  
  	out[0]=r;
  	out[1]=l;
  	}
  
  