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/* des.h
*
* The des block cipher. And triple des.
*/
/* nettle, low-level cryptographics library
*
* Copyright (C) 1992, 2001, Dana L. How, 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., 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 `../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"
/* Namespace mangling */
#define des_set_key nettle_des_set_key
#define des_encrypt nettle_des_encrypt
#define des_decrypt nettle_des_decrypt
#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
enum des_error { DES_OK, DES_BAD_PARITY, DES_WEAK_KEY };
struct des_ctx
{
uint32_t key[_DES_KEY_LENGTH];
enum des_error status;
};
/* On success, returns 1 and sets ctx->status to DES_OK (zero). On
* error, returns 0 and sets ctx->status accordingly. */
int
des_set_key(struct des_ctx *ctx, const uint8_t *key);
void
des_encrypt(const struct des_ctx *ctx,
unsigned length, uint8_t *dst,
const uint8_t *src);
void
des_decrypt(const struct des_ctx *ctx,
unsigned length, uint8_t *dst,
const uint8_t *src);
void
des_fix_parity(unsigned 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];
enum des_error status;
};
/* On success, returns 1 and sets ctx->status to DES_OK (zero). On
* error, returns 0 and sets ctx->status accordingly. */
int
des3_set_key(struct des3_ctx *ctx, const uint8_t *key);
void
des3_encrypt(const struct des3_ctx *ctx,
unsigned length, uint8_t *dst,
const uint8_t *src);
void
des3_decrypt(const struct des3_ctx *ctx,
unsigned length, uint8_t *dst,
const uint8_t *src);
#endif /* NETTLE_DES_H_INCLUDED */
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