/* 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.]

 */

#include <stdio.h>

/* 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

#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))))\

EXPORT_C 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+=8)

			{

			D_ENCRYPT(l,r,i+0); /*  1 */

			D_ENCRYPT(r,l,i+2); /*  2 */

			D_ENCRYPT(l,r,i+4); /*  1 */

			D_ENCRYPT(r,l,i+6); /*  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;

	}