a4ee1f9659537946e8296b5ca032c92b0ea5ee46
[libav.git] / libavutil / aes.h
1 /*
2 * copyright (c) 2007 Michael Niedermayer <michaelni@gmx.at>
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg 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 * FFmpeg 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 FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 #ifndef AES_H
22 #define AES_H
23
24 #include <stdint.h>
25
26 extern const int av_aes_size;
27
28 struct AVAES;
29
30 /**
31 * initializes an AVAES context
32 * @param key_bits 128, 192 or 256
33 * @param decrypt 0 for encryption, 1 for decryption
34 */
35 int av_aes_init(struct AVAES *a, const uint8_t *key, int key_bits, int decrypt);
36
37 /**
38 * encrypts / decrypts.
39 * @param count number of 16 byte blocks
40 * @param dst destination array, can be equal to src
41 * @param src source array, can be equal to dst
42 * @param iv initialization vector for CBC mode, if NULL then ECB will be used
43 * @param decrypt 0 for encryption, 1 for decryption
44 */
45 void av_aes_crypt(struct AVAES *a, uint8_t *dst, uint8_t *src, int count, uint8_t *iv, int decrypt);
46
47 #endif /* AES_H */