Commit | Line | Data |
---|---|---|
2ba45a60 DM |
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 */ |