FFmpeg 7.1.1
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random_seed.h
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1/*
2 * Copyright (c) 2009 Baptiste Coudurier <baptiste.coudurier@gmail.com>
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21#ifndef AVUTIL_RANDOM_SEED_H
22#define AVUTIL_RANDOM_SEED_H
23
24#include <stddef.h>
25#include <stdint.h>
26/**
27 * @addtogroup lavu_crypto
28 * @{
29 */
30
31/**
32 * Get a seed to use in conjunction with random functions.
33 * This function tries to provide a good seed at a best effort bases.
34 * Its possible to call this function multiple times if more bits are needed.
35 * It can be quite slow, which is why it should only be used as seed for a faster
36 * PRNG. The quality of the seed depends on the platform.
37 */
38uint32_t av_get_random_seed(void);
39
40/**
41 * Generate cryptographically secure random data, i.e. suitable for use as
42 * encryption keys and similar.
43 *
44 * @param buf buffer into which the random data will be written
45 * @param len size of buf in bytes
46 *
47 * @retval 0 success, len bytes of random data was written
48 * into buf
49 * @retval "a negative AVERROR code" random data could not be generated
50 */
51int av_random_bytes(uint8_t *buf, size_t len);
52
53/**
54 * @}
55 */
56
57#endif /* AVUTIL_RANDOM_SEED_H */
uint32_t av_get_random_seed(void)
Get a seed to use in conjunction with random functions.
int av_random_bytes(uint8_t *buf, size_t len)
Generate cryptographically secure random data, i.e.