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/* des.h

The des block cipher. And triple des.

This file is part of GNU Nettle.

GNU Nettle is free software: you can redistribute it and/or
   modify it under the terms of either:

* the GNU Lesser General Public License as published by the Free
       Software Foundation; either version 3 of the License, or (at your
       option) any later version.

* the GNU General Public License as published by the Free
       Software Foundation; either version 2 of the License, or (at your
       option) any later version.

or both in parallel, as here.

GNU Nettle 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
   General Public License for more details.

You should have received copies of the GNU General Public License and
   the GNU Lesser General Public License along with this program.  If
   not, see http://www.gnu.org/licenses/.
*/

/*
 *	des - fast & portable DES encryption & decryption.
 *	Copyright (C) 1992  Dana L. How
 *	Please see the file `../lib/descore.README' for the complete copyright
 *	notice.
 *
 * Slightly edited by Niels Möller, 1997
 */

#ifndef NETTLE_DES_H_INCLUDED
#define NETTLE_DES_H_INCLUDED

#include "nettle-types.h"

#ifdef __cplusplus
extern "C" {
#endif

/* Namespace mangling */
#define des_set_key nettle_des_set_key
#define des_encrypt nettle_des_encrypt
#define des_decrypt nettle_des_decrypt
#define des_check_parity nettle_des_check_parity
#define des_fix_parity nettle_des_fix_parity
#define des3_set_key nettle_des3_set_key
#define des3_encrypt nettle_des3_encrypt
#define des3_decrypt nettle_des3_decrypt

#define DES_KEY_SIZE 8
#define DES_BLOCK_SIZE 8

/* Expanded key length */
#define _DES_KEY_LENGTH 32

struct des_ctx
{
  uint32_t key[_DES_KEY_LENGTH];
};

/* Returns 1 for good keys and 0 for weak keys. */
int
des_set_key(struct des_ctx *ctx, const uint8_t *key);

void
des_encrypt(const struct des_ctx *ctx,
	    size_t length, uint8_t *dst,
	    const uint8_t *src);
void
des_decrypt(const struct des_ctx *ctx,
	    size_t length, uint8_t *dst,
	    const uint8_t *src);

int
des_check_parity(size_t length, const uint8_t *key);

void
des_fix_parity(size_t length, uint8_t *dst,
	       const uint8_t *src);

#define DES3_KEY_SIZE 24
#define DES3_BLOCK_SIZE DES_BLOCK_SIZE

struct des3_ctx
{
  struct des_ctx des[3];
};

/* Returns 1 for good keys and 0 for weak keys. */
int
des3_set_key(struct des3_ctx *ctx, const uint8_t *key);

void
des3_encrypt(const struct des3_ctx *ctx,
	     size_t length, uint8_t *dst,
	     const uint8_t *src);
void
des3_decrypt(const struct des3_ctx *ctx,
	     size_t length, uint8_t *dst,
	     const uint8_t *src);

#ifdef __cplusplus
}
#endif

#endif /* NETTLE_DES_H_INCLUDED */