/*	$OpenBSD: ecb_enc.c,v 1.5 2015/01/15 23:26:40 tedu Exp $	*/

/* lib/des/ecb_enc.c */
/* Copyright (C) 1995 Eric Young (eay@mincom.oz.au)
 * All rights reserved.
 * 
 * This file is part of an SSL implementation written
 * by Eric Young (eay@mincom.oz.au).
 * The implementation was written so as to conform with Netscapes SSL
 * specification.  This library and applications are
 * FREE FOR COMMERCIAL AND NON-COMMERCIAL USE
 * as long as the following conditions are aheared to.
 * 
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.  If this code is used in a product,
 * Eric Young should be given attribution as the author of the parts 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 software developed by Eric Young (eay@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"
#include "spr.h"

void
des_ecb_encrypt(des_cblock (*input), des_cblock (*output), des_key_schedule ks,
    int encrypt)
{
	register u_int32_t l0, l1;
	register unsigned char *in, *out;
	u_int32_t ll[2];

	in = (unsigned char *) input;
	out = (unsigned char *) output;
	c2l(in, l0);
	ll[0] = l0;
	c2l(in, l1);
	ll[1] = l1;
	des_encrypt(ll, ks, encrypt);
	l0 = ll[0];
	l2c(l0, out);
	l1 = ll[1];
	l2c(l1, out);
	l0 = l1 = ll[0] = ll[1] = 0;
}

void
des_encrypt(u_int32_t *data, des_key_schedule ks, int encrypt)
{
	register u_int32_t l, r, t, u;
#ifdef DES_USE_PTR
	register unsigned char *des_SP=(unsigned char *)des_SPtrans;
#endif
	register int i;
	register u_int32_t *s;

	u = data[0];
	r = data[1];

	IP(u, r);
	/* 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. */
	l = (r << 1) | (r >> 31);
	r = (u << 1) | (u >> 31);

	/* clear the top bits on machines with 8byte longs */
	l &= 0xffffffffL;
	r &= 0xffffffffL;

	s = (u_int32_t *) ks;
	/* I don't know if it is worth the effort of loop unrolling the
	 * inner loop */
	if (encrypt) {
		for (i = 0; i < 32; i += 4) {
			D_ENCRYPT(l, r, i + 0); /*  1 */
			D_ENCRYPT(r, l, i + 2); /*  2 */
		}
	} else {
		for (i = 30; i > 0; i -= 4) {
			D_ENCRYPT(l, r, i - 0); /* 16 */
			D_ENCRYPT(r, l, i - 2); /* 15 */
		}
	}
	l = (l >> 1) | (l << 31);
	r = (r >> 1) | (r << 31);
	/* clear the top bits on machines with 8byte longs */
	l &= 0xffffffffL;
	r &= 0xffffffffL;

	FP(r, l);
	data[0] = l;
	data[1] = r;
	l = r = t = u = 0;
}

void
des_encrypt2(u_int32_t *data, des_key_schedule ks, int encrypt)
{
	register u_int32_t l, r, t, u;
#ifdef DES_USE_PTR
	register unsigned char *des_SP=(unsigned char *)des_SPtrans;
#endif
	register int i;
	register u_int32_t *s;

	u = data[0];
	r = 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. */
	l = (r << 1) | (r >> 31);
	r = (u << 1) | (u >> 31);

	/* clear the top bits on machines with 8byte longs */
	l &= 0xffffffffL;
	r &= 0xffffffffL;

	s = (u_int32_t *) ks;
	/* I don't know if it is worth the effort of loop unrolling the
	 * inner loop */
	if (encrypt) {
		for (i = 0; i < 32; i += 4) {
			D_ENCRYPT(l, r, i + 0); /*  1 */
			D_ENCRYPT(r, l, i + 2); /*  2 */
		}
	} else {
		for (i = 30; i > 0; i -= 4) {
			D_ENCRYPT(l, r, i - 0); /* 16 */
			D_ENCRYPT(r, l, i - 2); /* 15 */
		}
	}
	l = (l >> 1) | (l << 31);
	r = (r >> 1) | (r << 31);
	/* clear the top bits on machines with 8byte longs */
	l &= 0xffffffffL;
	r &= 0xffffffffL;

	data[0] = l;
	data[1] = r;
	l = r = t = u = 0;
}