FFmpeg
aes.h
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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 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 extern const int av_aes_size;
36 
37 struct AVAES;
38 
39 /**
40  * Allocate an AVAES context.
41  */
42 struct AVAES *av_aes_alloc(void);
43 
44 /**
45  * Initialize an AVAES context.
46  * @param key_bits 128, 192 or 256
47  * @param decrypt 0 for encryption, 1 for decryption
48  */
49 int av_aes_init(struct AVAES *a, const uint8_t *key, int key_bits, int decrypt);
50 
51 /**
52  * Encrypt or decrypt a buffer using a previously initialized context.
53  * @param count number of 16 byte blocks
54  * @param dst destination array, can be equal to src
55  * @param src source array, can be equal to dst
56  * @param iv initialization vector for CBC mode, if NULL then ECB will be used
57  * @param decrypt 0 for encryption, 1 for decryption
58  */
59 void av_aes_crypt(struct AVAES *a, uint8_t *dst, const uint8_t *src, int count, uint8_t *iv, int decrypt);
60 
61 /**
62  * @}
63  */
64 
65 #endif /* AVUTIL_AES_H */
void av_aes_crypt(struct AVAES *a, uint8_t *dst, const uint8_t *src, int count, uint8_t *iv, int decrypt)
Encrypt or decrypt a buffer using a previously initialized context.
Definition: aes.c:163
The reader does not expect b to be semantically here and if the code is changed by maybe adding a a division or other the signedness will almost certainly be mistaken To avoid this confusion a new type was SUINT is the C unsigned type but it holds a signed int to use the same example SUINT a
Definition: undefined.txt:36
const int av_aes_size
Definition: aes.c:29
const char * key
#define src
Definition: vp8dsp.c:254
Macro definitions for various function/variable attributes.
uint8_t
struct AVAES * av_aes_alloc(void)
Allocate an AVAES context.
Definition: aes.c:31
Libavutil version macros.
GLsizei count
Definition: opengl_enc.c:108
int av_aes_init(struct AVAES *a, const uint8_t *key, int key_bits, int decrypt)
Initialize an AVAES context.
Definition: aes.c:195