/*

 * copyright (c) 2007 Michael Niedermayer <michaelni@gmx.at>

 *

 * This file is part of FFmpeg.

 *

 * FFmpeg 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.

 *

 * FFmpeg 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 FFmpeg; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

 */



#ifndef AVUTIL_AES_H

#define AVUTIL_AES_H



#include <stdint.h>



extern const int av_aes_size;



struct AVAES;



/**

 * Initialize an AVAES context.

 * @param key_bits 128, 192 or 256

 * @param decrypt 0 for encryption, 1 for decryption

 */

int av_aes_init(struct AVAES *a, const uint8_t *key, int key_bits, int decrypt);



/**

 * Encrypt or decrypt a buffer using a previously initialized context.

 * @param count number of 16 byte blocks

 * @param dst destination array, can be equal to src

 * @param src source array, can be equal to dst

 * @param iv initialization vector for CBC mode, if NULL then ECB will be used

 * @param decrypt 0 for encryption, 1 for decryption

 */

void av_aes_crypt(struct AVAES *a, uint8_t *dst, const uint8_t *src, int count, uint8_t *iv, int decrypt);



#endif /* AVUTIL_AES_H */

