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/* des.h --- DES cipher implementation.
* Copyright (C) 2005, 2007 Free Software Foundation, Inc.
*
* This file is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published
* by the Free Software Foundation; either version 2, or (at your
* option) any later version.
*
* This file 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 a copy of the GNU General Public License
* along with this file; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
*/
/* Adapted for gnulib by Simon Josefsson, based on Libgcrypt. */
#ifndef DES_H
# define DES_H
#include <stddef.h>
#include <stdint.h>
#include <stdbool.h>
/*
* Encryption/Decryption context of DES
*/
typedef struct
{
uint32_t encrypt_subkeys[32];
uint32_t decrypt_subkeys[32];
} gl_des_ctx;
/*
* Encryption/Decryption context of Triple-DES
*/
typedef struct
{
uint32_t encrypt_subkeys[96];
uint32_t decrypt_subkeys[96];
} gl_3des_ctx;
/* Check whether the 8 byte key is weak. Does not check the parity
* bits of the key but simple ignore them. */
extern bool
gl_des_is_weak_key (const char * key);
/*
* DES
* ---
*/
/* Fill a DES context CTX with subkeys calculated from 64bit KEY.
* Does not check parity bits, but simply ignore them. Does not check
* for weak keys. */
extern void
gl_des_setkey (gl_des_ctx *ctx, const char * key);
/* Fill a DES context CTX with subkeys calculated from 64bit KEY, with
* weak key checking. Does not check parity bits, but simply ignore
* them. */
extern bool
gl_des_makekey (gl_des_ctx *ctx, const char * key, size_t keylen);
/* Electronic Codebook Mode DES encryption/decryption of data
* according to 'mode'. */
extern void
gl_des_ecb_crypt (gl_des_ctx *ctx, const char * from, char * to, int mode);
#define gl_des_ecb_encrypt(ctx, from, to) gl_des_ecb_crypt(ctx, from, to, 0)
#define gl_des_ecb_decrypt(ctx, from, to) gl_des_ecb_crypt(ctx, from, to, 1)
/* Triple-DES
* ----------
*/
/* Fill a Triple-DES context CTX with subkeys calculated from two
* 64bit keys in KEY1 and KEY2. Does not check the parity bits of the
* keys, but simply ignore them. Does not check for weak keys. */
extern void
gl_3des_set2keys (gl_3des_ctx *ctx,
const char * key1,
const char * key2);
/*
* Fill a Triple-DES context CTX with subkeys calculated from three
* 64bit keys in KEY1, KEY2 and KEY3. Does not check the parity bits
* of the keys, but simply ignore them. Does not check for weak
* keys. */
extern void
gl_3des_set3keys (gl_3des_ctx *ctx,
const char * key1,
const char * key2,
const char * key3);
/* Fill a Triple-DES context CTX with subkeys calculated from three
* concatenated 64bit keys in KEY, with weak key checking. Does not
* check the parity bits of the keys, but simply ignore them. */
extern bool
gl_3des_makekey (gl_3des_ctx *ctx,
const char * key,
size_t keylen);
/* Electronic Codebook Mode Triple-DES encryption/decryption of data
* according to 'mode'. Sometimes this mode is named 'EDE' mode
* (Encryption-Decryption-Encryption). */
extern void
gl_3des_ecb_crypt (gl_3des_ctx *ctx,
const char * from,
char * to,
int mode);
#define gl_3des_ecb_encrypt(ctx, from, to) gl_3des_ecb_crypt(ctx,from,to,0)
#define gl_3des_ecb_decrypt(ctx, from, to) gl_3des_ecb_crypt(ctx,from,to,1)
#endif /* DES_H */
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