FFmpeg 5.1.6
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
35extern const int av_tea_size;
36
37struct AVTEA;
38
39/**
40 * Allocate an AVTEA context
41 * To free the struct: av_free(ptr)
42 */
43struct 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 */
52void 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 */
64void 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 int av_tea_size
void av_tea_init(struct AVTEA *ctx, const uint8_t key[16], int rounds)
Initialize an AVTEA context.
struct AVTEA * av_tea_alloc(void)
Allocate an AVTEA context To free the struct: av_free(ptr)
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.