/* serpent.h */
/*
    This file is part of the Crypto-avr-lib/microcrypt-lib.
    Copyright (C) 2008  Daniel Otte (daniel.otte@rub.de)

    This program 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 3 of the License, or
    (at your option) any later version.

    This program 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 program.  If not, see <http://www.gnu.org/licenses/>.
*/
/* serpent.h
 * a bitsliced implementation of the serpent cipher for avr microcontrollers
 * author: Daniel Otte
 * license: GPLv3
 */

#ifndef SERPENT_H_
#define SERPENT_H_

#include <stdint.h>

typedef uint32_t serpent_subkey_t[4];

typedef struct serpent_ctx_st {
	serpent_subkey_t k[33];
}  serpent_ctx_t;

#define SERPENT_KEY128 128
#define SERPENT_KEY192 192
#define SERPENT_KEY256   0


/* key must be 256bit (32 byte) large! */
void serpent_genctx(void * key, uint8_t keysize, serpent_ctx_t * ctx);
void serpent_enc(void * buffer, serpent_ctx_t * ctx);
void serpent_dec(void * buffer, serpent_ctx_t * ctx);


#endif /*SERPENT_H_*/