diff options
Diffstat (limited to 'des.h')
-rw-r--r-- | des.h | 68 |
1 files changed, 68 insertions, 0 deletions
@@ -0,0 +1,68 @@ +/* des.h + * + * The des block cipher. + */ + +/* 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 GNU MP 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 GNU MP 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 +#define NETTLE_DES_H + +#include <stdint.h> + +#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. On error, + * returns 0 and sets ctx->status accordingly. */ +int +des_set_key(struct des_ctx *ctx, const uint8_t *key); + +void +des_encrypt(struct des_ctx *ctx, + unsigned length, uint8_t *dst, + const uint8_t *src); +void +des_decrypt(struct des_ctx *ctx, + unsigned length, uint8_t *dst, + const uint8_t *src); + +#endif /* NETTLE_DES_H */ |