des.c

/* des.c
 *
 * The des block cipher.
 *
 * $Id$
 */

/* nettle, low-level cryptographics library
 *
 * Copyright (C) 2001 Niels Mller
 *  
 * The nettle library is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or (at your
 * option) any later version.
 * 
 * The nettle library is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
 * License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with the nettle library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
 * MA 02111-1307, USA.
 */

/*	des - fast & portable DES encryption & decryption.
 *	Copyright (C) 1992  Dana L. How
 *	Please see the file `descore.README' for the complete copyright notice.
 */

#if HAVE_CONFIG_H
# include "config.h"
#endif

#include <assert.h>

#include "des.h"

#include "desCode.h"

/* various tables */

static const uint32_t
des_keymap[] = {
#include	"keymap.h"
};

static const uint8_t
rotors[] = {
#include	"rotors.h"
};

static const char
parity[] = {
#include	"parity.h"
};

static ENCRYPT(DesSmallFipsEncrypt,TEMPSMALL, LOADFIPS,KEYMAPSMALL,SAVEFIPS)
static DECRYPT(DesSmallFipsDecrypt,TEMPSMALL, LOADFIPS,KEYMAPSMALL,SAVEFIPS)

void
des_fix_parity(unsigned length, uint8_t *dst,
	       const uint8_t *src)
{
  unsigned i;
  for (i = 0; i<length; i++)
    dst[i] = src[i] ^ (parity[src[i]] == 8);
}