ffmpeg.libavutil.xtea source code

1 /*
2  * A 32-bit implementation of the XTEA algorithm
3  * Copyright (c) 2012 Samuel Pitoiset
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.xtea;
23 
24 extern (C):
25 import ffmpeg; @nogc nothrow:
26 
27 /**
28  * @file
29  * @brief Public header for libavutil XTEA algorithm
30  * @defgroup lavu_xtea XTEA
31  * @ingroup lavu_crypto
32  * @{
33  */
34 
35 struct AVXTEA
36 {
37     uint[16] key;
38 }
39 
40 /**
41  * Allocate an AVXTEA context.
42  */
43 AVXTEA* av_xtea_alloc ();
44 
45 /**
46  * Initialize an AVXTEA context.
47  *
48  * @param ctx an AVXTEA context
49  * @param key a key of 16 bytes used for encryption/decryption,
50  *            interpreted as big endian 32 bit numbers
51  */
52 void av_xtea_init (AVXTEA* ctx, ref const(ubyte)[16] key);
53 
54 /**
55  * Initialize an AVXTEA context.
56  *
57  * @param ctx an AVXTEA context
58  * @param key a key of 16 bytes used for encryption/decryption,
59  *            interpreted as little endian 32 bit numbers
60  */
61 void av_xtea_le_init (AVXTEA* ctx, ref const(ubyte)[16] key);
62 
63 /**
64  * Encrypt or decrypt a buffer using a previously initialized context,
65  * in big endian format.
66  *
67  * @param ctx an AVXTEA context
68  * @param dst destination array, can be equal to src
69  * @param src source array, can be equal to dst
70  * @param count number of 8 byte blocks
71  * @param iv initialization vector for CBC mode, if NULL then ECB will be used
72  * @param decrypt 0 for encryption, 1 for decryption
73  */
74 void av_xtea_crypt (
75     AVXTEA* ctx,
76     ubyte* dst,
77     const(ubyte)* src,
78     int count,
79     ubyte* iv,
80     int decrypt);
81 
82 /**
83  * Encrypt or decrypt a buffer using a previously initialized context,
84  * in little endian format.
85  *
86  * @param ctx an AVXTEA context
87  * @param dst destination array, can be equal to src
88  * @param src source array, can be equal to dst
89  * @param count number of 8 byte blocks
90  * @param iv initialization vector for CBC mode, if NULL then ECB will be used
91  * @param decrypt 0 for encryption, 1 for decryption
92  */
93 void av_xtea_le_crypt (
94     AVXTEA* ctx,
95     ubyte* dst,
96     const(ubyte)* src,
97     int count,
98     ubyte* iv,
99     int decrypt);
100 
101 /**
102  * @}
103  */
104 
105 /* AVUTIL_XTEA_H */