1 /*

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

     3  *

     4  * This file is part of Libav.

     5  *

     6  * Libav is free software; you can redistribute it and/or

     7  * modify it under the terms of the GNU Lesser General Public

     8  * License as published by the Free Software Foundation; either

     9  * version 2.1 of the License, or (at your option) any later version.

    10  *

    11  * Libav is distributed in the hope that it will be useful,

    12  * but WITHOUT ANY WARRANTY; without even the implied warranty of

    13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

    14  * Lesser General Public License for more details.

    15  *

    16  * You should have received a copy of the GNU Lesser General Public

    17  * License along with Libav; if not, write to the Free Software

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

    19  */

    20 

    21 #ifndef AVUTIL_AES_H

    22 #define AVUTIL_AES_H

    23 

    24 #include <stdint.h>

    25 

    26 #include "attributes.h"

    27 #include "version.h"

    28 

    29 /**

    30  * @defgroup lavu_aes AES

    31  * @ingroup lavu_crypto

    32  * @{

    33  */

    34 

    35 #if FF_API_CONTEXT_SIZE

    36 extern attribute_deprecated const int av_aes_size;

    37 #endif

    38 

    39 struct AVAES;

    40 

    41 /**

    42  * Allocate an AVAES context.

    43  */

    44 struct AVAES *av_aes_alloc(void);

    45 

    46 /**

    47  * Initialize an AVAES context.

    48  * @param key_bits 128, 192 or 256

    49  * @param decrypt 0 for encryption, 1 for decryption

    50  */

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

    52 

    53 /**

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

    55  * @param count number of 16 byte blocks

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

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

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

    59  * @param decrypt 0 for encryption, 1 for decryption

    60  */

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

    62 

    63 /**

    64  * @}

    65  */

    66 

    67 #endif /* AVUTIL_AES_H */