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 module ffmpeg.libavutil.aes_ctr;
22 
23 extern (C) @nogc nothrow:
24 
25 enum AES_CTR_KEY_SIZE = 16;
26 enum AES_CTR_IV_SIZE = 8;
27 
28 struct AVAESCTR;
29 
30 /**
31  * Allocate an AVAESCTR context.
32  */
33 AVAESCTR* av_aes_ctr_alloc ();
34 
35 /**
36  * Initialize an AVAESCTR context.
37  * @param key encryption key, must have a length of AES_CTR_KEY_SIZE
38  */
39 int av_aes_ctr_init (AVAESCTR* a, const(ubyte)* key);
40 
41 /**
42  * Release an AVAESCTR context.
43  */
44 void av_aes_ctr_free (AVAESCTR* a);
45 
46 /**
47  * Process a buffer using a previously initialized context.
48  * @param dst destination array, can be equal to src
49  * @param src source array, can be equal to dst
50  * @param size the size of src and dst
51  */
52 void av_aes_ctr_crypt (AVAESCTR* a, ubyte* dst, const(ubyte)* src, int size);
53 
54 /**
55  * Get the current iv
56  */
57 const(ubyte)* av_aes_ctr_get_iv (AVAESCTR* a);
58 
59 /**
60  * Generate a random iv
61  */
62 void av_aes_ctr_set_random_iv (AVAESCTR* a);
63 
64 /**
65  * Forcefully change the 8-byte iv
66  */
67 void av_aes_ctr_set_iv (AVAESCTR* a, const(ubyte)* iv);
68 
69 /**
70  * Forcefully change the "full" 16-byte iv, including the counter
71  */
72 void av_aes_ctr_set_full_iv (AVAESCTR* a, const(ubyte)* iv);
73 
74 /**
75  * Increment the top 64 bit of the iv (performed after each frame)
76  */
77 void av_aes_ctr_increment_iv (AVAESCTR* a);
78 
79 /**
80  * @}
81  */
82 
83 /* AVUTIL_AES_CTR_H */