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des-compat.c 5.43 KiB
/* des-compat.h
*
* The des block cipher, libdes/openssl-style interface.
*/
/* nettle, low-level cryptographics library
*
* Copyright (C) 2001 Niels Möller
*
* 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., 51 Franklin Street, Fifth Floor, Boston,
* MA 02111-1301, USA.
*/
#if HAVE_CONFIG_H
# include "config.h"
#endif
#include <string.h>
#include <assert.h>
#include "des-compat.h"
#include "cbc.h"
#include "macros.h"
#include "memxor.h"
struct des_compat_des3 { const struct des_ctx *keys[3]; };
static void
des_compat_des3_encrypt(struct des_compat_des3 *ctx,
uint32_t length, uint8_t *dst, const uint8_t *src)
{
nettle_des_encrypt(ctx->keys[0], length, dst, src);
nettle_des_decrypt(ctx->keys[1], length, dst, dst);
nettle_des_encrypt(ctx->keys[2], length, dst, dst);
}
static void
des_compat_des3_decrypt(struct des_compat_des3 *ctx,
uint32_t length, uint8_t *dst, const uint8_t *src)
{
nettle_des_decrypt(ctx->keys[2], length, dst, src);
nettle_des_encrypt(ctx->keys[1], length, dst, dst);
nettle_des_decrypt(ctx->keys[0], length, dst, dst);
}
void
des_ecb3_encrypt(const_des_cblock *src, des_cblock *dst,
des_key_schedule k1,
des_key_schedule k2,
des_key_schedule k3, int enc)
{
struct des_compat_des3 keys;
keys.keys[0] = k1;
keys.keys[1] = k2;
keys.keys[2] = k3;
((enc == DES_ENCRYPT) ? des_compat_des3_encrypt : des_compat_des3_decrypt)