FFmpeg
tea.h
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1 /*
2  * A 32-bit implementation of the TEA algorithm
3  * Copyright (c) 2015 Vesselin Bontchev
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_TEA_H
23 #define AVUTIL_TEA_H
24 
25 #include <stdint.h>
26 
27 /**
28  * @file
29  * @brief Public header for libavutil TEA algorithm
30  * @defgroup lavu_tea TEA
31  * @ingroup lavu_crypto
32  * @{
33  */
34 
35 extern const int av_tea_size;
36 
37 struct AVTEA;
38 
39 /**
40  * Allocate an AVTEA context
41  * To free the struct: av_free(ptr)
42  */
43 struct AVTEA *av_tea_alloc(void);
44 
45 /**
46  * Initialize an AVTEA context.
47  *
48  * @param ctx an AVTEA context
49  * @param key a key of 16 bytes used for encryption/decryption
50  * @param rounds the number of rounds in TEA (64 is the "standard")
51  */
52 void av_tea_init(struct AVTEA *ctx, const uint8_t key[16], int rounds);
53 
54 /**
55  * Encrypt or decrypt a buffer using a previously initialized context.
56  *
57  * @param ctx an AVTEA context
58  * @param dst destination array, can be equal to src
59  * @param src source array, can be equal to dst
60  * @param count number of 8 byte blocks
61  * @param iv initialization vector for CBC mode, if NULL then ECB will be used
62  * @param decrypt 0 for encryption, 1 for decryption
63  */
64 void av_tea_crypt(struct AVTEA *ctx, uint8_t *dst, const uint8_t *src,
65  int count, uint8_t *iv, int decrypt);
66 
67 /**
68  * @}
69  */
70 
71 #endif /* AVUTIL_TEA_H */
const char * key
#define src
Definition: vp8dsp.c:254
struct AVTEA * av_tea_alloc(void)
Allocate an AVTEA context To free the struct: av_free(ptr)
Definition: tea.c:35
uint8_t
Definition: tea.c:30
GLsizei count
Definition: opengl_enc.c:108
void av_tea_crypt(struct AVTEA *ctx, uint8_t *dst, const uint8_t *src, int count, uint8_t *iv, int decrypt)
Encrypt or decrypt a buffer using a previously initialized context.
Definition: tea.c:95
AVFormatContext * ctx
Definition: movenc.c:48
int rounds
Definition: tea.c:32
const int av_tea_size
Definition: tea.c:40
void av_tea_init(struct AVTEA *ctx, const uint8_t key[16], int rounds)
Initialize an AVTEA context.
Definition: tea.c:42