des.h 2.74 KB
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/* des.h
 *
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 * The des block cipher. And triple des.
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 */

/* nettle, low-level cryptographics library
 *
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 * Copyright (C) 1992, 2001, Dana L. How, Niels Möller
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 * 
 * 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.
 * 
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 * The nettle library is distributed in the hope that it will be useful, but
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 * 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
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 * along with the nettle library; see the file COPYING.LIB.  If not, write to
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 * 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.
 *
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 * Slightly edited by Niels Möller, 1997
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 */

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#ifndef NETTLE_DES_H_INCLUDED
#define NETTLE_DES_H_INCLUDED
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#include "nettle-types.h"
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#ifdef __cplusplus
extern "C" {
#endif

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/* Namespace mangling */
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#define des_set_key nettle_des_set_key
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#define des_encrypt nettle_des_encrypt
#define des_decrypt nettle_des_decrypt
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#define des_check_parity nettle_des_check_parity
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#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
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#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];
};

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

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

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

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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];
};


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

void
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des3_encrypt(const struct des3_ctx *ctx,
	     unsigned length, uint8_t *dst,
	     const uint8_t *src);
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void
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des3_decrypt(const struct des3_ctx *ctx,
	     unsigned length, uint8_t *dst,
	     const uint8_t *src);
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#ifdef __cplusplus
}
#endif

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#endif /* NETTLE_DES_H_INCLUDED */