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xtea.h
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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 #ifndef AVUTIL_XTEA_H
23 #define AVUTIL_XTEA_H
24 
25 #include <stdint.h>
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 typedef struct AVXTEA {
36  uint32_t key[16];
37 } AVXTEA;
38 
39 /**
40  * Initialize an AVXTEA context.
41  *
42  * @param ctx an AVXTEA context
43  * @param key a key of 16 bytes used for encryption/decryption
44  */
45 void av_xtea_init(struct AVXTEA *ctx, const uint8_t key[16]);
46 
47 /**
48  * Encrypt or decrypt a buffer using a previously initialized context.
49  *
50  * @param ctx an AVXTEA context
51  * @param dst destination array, can be equal to src
52  * @param src source array, can be equal to dst
53  * @param count number of 8 byte blocks
54  * @param iv initialization vector for CBC mode, if NULL then ECB will be used
55  * @param decrypt 0 for encryption, 1 for decryption
56  */
57 void av_xtea_crypt(struct AVXTEA *ctx, uint8_t *dst, const uint8_t *src,
58  int count, uint8_t *iv, int decrypt);
59 
60 /**
61  * @}
62  */
63 
64 #endif /* AVUTIL_XTEA_H */