sl@0: /* crypto/des/fcrypt_b.c */
sl@0: /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
sl@0:  * All rights reserved.
sl@0:  *
sl@0:  * This package is an SSL implementation written
sl@0:  * by Eric Young (eay@cryptsoft.com).
sl@0:  * The implementation was written so as to conform with Netscapes SSL.
sl@0:  * 
sl@0:  * This library is free for commercial and non-commercial use as long as
sl@0:  * the following conditions are aheared to.  The following conditions
sl@0:  * apply to all code found in this distribution, be it the RC4, RSA,
sl@0:  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
sl@0:  * included with this distribution is covered by the same copyright terms
sl@0:  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
sl@0:  * 
sl@0:  * Copyright remains Eric Young's, and as such any Copyright notices in
sl@0:  * the code are not to be removed.
sl@0:  * If this package is used in a product, Eric Young should be given attribution
sl@0:  * as the author of the parts of the library used.
sl@0:  * This can be in the form of a textual message at program startup or
sl@0:  * in documentation (online or textual) provided with the package.
sl@0:  * 
sl@0:  * Redistribution and use in source and binary forms, with or without
sl@0:  * modification, are permitted provided that the following conditions
sl@0:  * are met:
sl@0:  * 1. Redistributions of source code must retain the copyright
sl@0:  *    notice, this list of conditions and the following disclaimer.
sl@0:  * 2. Redistributions in binary form must reproduce the above copyright
sl@0:  *    notice, this list of conditions and the following disclaimer in the
sl@0:  *    documentation and/or other materials provided with the distribution.
sl@0:  * 3. All advertising materials mentioning features or use of this software
sl@0:  *    must display the following acknowledgement:
sl@0:  *    "This product includes cryptographic software written by
sl@0:  *     Eric Young (eay@cryptsoft.com)"
sl@0:  *    The word 'cryptographic' can be left out if the rouines from the library
sl@0:  *    being used are not cryptographic related :-).
sl@0:  * 4. If you include any Windows specific code (or a derivative thereof) from 
sl@0:  *    the apps directory (application code) you must include an acknowledgement:
sl@0:  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
sl@0:  * 
sl@0:  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
sl@0:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
sl@0:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
sl@0:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
sl@0:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
sl@0:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
sl@0:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
sl@0:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
sl@0:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
sl@0:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
sl@0:  * SUCH DAMAGE.
sl@0:  * 
sl@0:  * The licence and distribution terms for any publically available version or
sl@0:  * derivative of this code cannot be changed.  i.e. this code cannot simply be
sl@0:  * copied and put under another distribution licence
sl@0:  * [including the GNU Public Licence.]
sl@0:  */
sl@0: 
sl@0: #include <stdio.h>
sl@0: 
sl@0: /* This version of crypt has been developed from my MIT compatible
sl@0:  * DES library.
sl@0:  * The library is available at pub/Crypto/DES at ftp.psy.uq.oz.au
sl@0:  * Eric Young (eay@cryptsoft.com)
sl@0:  */
sl@0: 
sl@0: #define DES_FCRYPT
sl@0: #include "des_locl.h"
sl@0: #undef DES_FCRYPT
sl@0: 
sl@0: #undef PERM_OP
sl@0: #define PERM_OP(a,b,t,n,m) ((t)=((((a)>>(n))^(b))&(m)),\
sl@0: 	(b)^=(t),\
sl@0: 	(a)^=((t)<<(n)))
sl@0: 
sl@0: #undef HPERM_OP
sl@0: #define HPERM_OP(a,t,n,m) ((t)=((((a)<<(16-(n)))^(a))&(m)),\
sl@0: 	(a)=(a)^(t)^(t>>(16-(n))))\
sl@0: 
sl@0: EXPORT_C void fcrypt_body(DES_LONG *out, DES_key_schedule *ks, DES_LONG Eswap0,
sl@0: 		 DES_LONG Eswap1)
sl@0: 	{
sl@0: 	register DES_LONG l,r,t,u;
sl@0: #ifdef DES_PTR
sl@0: 	register const unsigned char *des_SP=(const unsigned char *)DES_SPtrans;
sl@0: #endif
sl@0: 	register DES_LONG *s;
sl@0: 	register int j;
sl@0: 	register DES_LONG E0,E1;
sl@0: 
sl@0: 	l=0;
sl@0: 	r=0;
sl@0: 
sl@0: 	s=(DES_LONG *)ks;
sl@0: 	E0=Eswap0;
sl@0: 	E1=Eswap1;
sl@0: 
sl@0: 	for (j=0; j<25; j++)
sl@0: 		{
sl@0: #ifndef DES_UNROLL
sl@0: 		register int i;
sl@0: 
sl@0: 		for (i=0; i<32; i+=8)
sl@0: 			{
sl@0: 			D_ENCRYPT(l,r,i+0); /*  1 */
sl@0: 			D_ENCRYPT(r,l,i+2); /*  2 */
sl@0: 			D_ENCRYPT(l,r,i+4); /*  1 */
sl@0: 			D_ENCRYPT(r,l,i+6); /*  2 */
sl@0: 			}
sl@0: #else
sl@0: 		D_ENCRYPT(l,r, 0); /*  1 */
sl@0: 		D_ENCRYPT(r,l, 2); /*  2 */
sl@0: 		D_ENCRYPT(l,r, 4); /*  3 */
sl@0: 		D_ENCRYPT(r,l, 6); /*  4 */
sl@0: 		D_ENCRYPT(l,r, 8); /*  5 */
sl@0: 		D_ENCRYPT(r,l,10); /*  6 */
sl@0: 		D_ENCRYPT(l,r,12); /*  7 */
sl@0: 		D_ENCRYPT(r,l,14); /*  8 */
sl@0: 		D_ENCRYPT(l,r,16); /*  9 */
sl@0: 		D_ENCRYPT(r,l,18); /*  10 */
sl@0: 		D_ENCRYPT(l,r,20); /*  11 */
sl@0: 		D_ENCRYPT(r,l,22); /*  12 */
sl@0: 		D_ENCRYPT(l,r,24); /*  13 */
sl@0: 		D_ENCRYPT(r,l,26); /*  14 */
sl@0: 		D_ENCRYPT(l,r,28); /*  15 */
sl@0: 		D_ENCRYPT(r,l,30); /*  16 */
sl@0: #endif
sl@0: 
sl@0: 		t=l;
sl@0: 		l=r;
sl@0: 		r=t;
sl@0: 		}
sl@0: 	l=ROTATE(l,3)&0xffffffffL;
sl@0: 	r=ROTATE(r,3)&0xffffffffL;
sl@0: 
sl@0: 	PERM_OP(l,r,t, 1,0x55555555L);
sl@0: 	PERM_OP(r,l,t, 8,0x00ff00ffL);
sl@0: 	PERM_OP(l,r,t, 2,0x33333333L);
sl@0: 	PERM_OP(r,l,t,16,0x0000ffffL);
sl@0: 	PERM_OP(l,r,t, 4,0x0f0f0f0fL);
sl@0: 
sl@0: 	out[0]=r;
sl@0: 	out[1]=l;
sl@0: 	}
sl@0: