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comparison lib/libavutil/xtea.h @ 2134:992d2e6f907d

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preparation for libavcodec
author zipi
date Tue, 31 Dec 2013 14:52:14 +0000
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2133:e378232bfd36 2134:992d2e6f907d
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 * @defgroup lavu_xtea XTEA
29 * @ingroup lavu_crypto
30 * @{
31 */
32
33 typedef struct AVXTEA {
34 uint32_t key[16];
35 } AVXTEA;
36
37 /**
38 * Initialize an AVXTEA context.
39 *
40 * @param ctx an AVXTEA context
41 * @param key a key of 16 bytes used for encryption/decryption
42 */
43 void av_xtea_init(struct AVXTEA *ctx, const uint8_t key[16]);
44
45 /**
46 * Encrypt or decrypt a buffer using a previously initialized context.
47 *
48 * @param ctx an AVXTEA context
49 * @param dst destination array, can be equal to src
50 * @param src source array, can be equal to dst
51 * @param count number of 8 byte blocks
52 * @param iv initialization vector for CBC mode, if NULL then ECB will be used
53 * @param decrypt 0 for encryption, 1 for decryption
54 */
55 void av_xtea_crypt(struct AVXTEA *ctx, uint8_t *dst, const uint8_t *src,
56 int count, uint8_t *iv, int decrypt);
57
58 /**
59 * @}
60 */
61
62 #endif /* AVUTIL_XTEA_H */