ffmpeg.libavutil.aes_ctr source code

1 /*
2  * AES-CTR cipher
3  * Copyright (c) 2015 Eran Kornblau <erankor at gmail dot com>
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 module ffmpeg.libavutil.aes_ctr;
23 
24 extern (C):
25 import ffmpeg; @nogc nothrow:
26 
27 enum AES_CTR_KEY_SIZE = 16;
28 enum AES_CTR_IV_SIZE = 8;
29 
30 struct AVAESCTR;
31 
32 /**
33  * Allocate an AVAESCTR context.
34  */
35 AVAESCTR* av_aes_ctr_alloc ();
36 
37 /**
38  * Initialize an AVAESCTR context.
39  * @param key encryption key, must have a length of AES_CTR_KEY_SIZE
40  */
41 int av_aes_ctr_init (AVAESCTR* a, const(ubyte)* key);
42 
43 /**
44  * Release an AVAESCTR context.
45  */
46 void av_aes_ctr_free (AVAESCTR* a);
47 
48 /**
49  * Process a buffer using a previously initialized context.
50  * @param dst destination array, can be equal to src
51  * @param src source array, can be equal to dst
52  * @param size the size of src and dst
53  */
54 void av_aes_ctr_crypt (AVAESCTR* a, ubyte* dst, const(ubyte)* src, int size);
55 
56 /**
57  * Get the current iv
58  */
59 const(ubyte)* av_aes_ctr_get_iv (AVAESCTR* a);
60 
61 /**
62  * Generate a random iv
63  */
64 void av_aes_ctr_set_random_iv (AVAESCTR* a);
65 
66 /**
67  * Forcefully change the 8-byte iv
68  */
69 void av_aes_ctr_set_iv (AVAESCTR* a, const(ubyte)* iv);
70 
71 /**
72  * Forcefully change the "full" 16-byte iv, including the counter
73  */
74 void av_aes_ctr_set_full_iv (AVAESCTR* a, const(ubyte)* iv);
75 
76 /**
77  * Increment the top 64 bit of the iv (performed after each frame)
78  */
79 void av_aes_ctr_increment_iv (AVAESCTR* a);
80 
81 /**
82  * @}
83  */
84 
85 /* AVUTIL_AES_CTR_H */