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58 lines
1.8 KiB
C
58 lines
1.8 KiB
C
/*
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* Copyright (c) 2009 Baptiste Coudurier <baptiste.coudurier@gmail.com>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVUTIL_RANDOM_SEED_H
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#define AVUTIL_RANDOM_SEED_H
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#include <stddef.h>
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#include <stdint.h>
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/**
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* @addtogroup lavu_crypto
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* @{
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*/
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/**
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* Get a seed to use in conjunction with random functions.
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* This function tries to provide a good seed at a best effort bases.
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* Its possible to call this function multiple times if more bits are needed.
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* It can be quite slow, which is why it should only be used as seed for a faster
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* PRNG. The quality of the seed depends on the platform.
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*/
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uint32_t av_get_random_seed(void);
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/**
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* Generate cryptographically secure random data, i.e. suitable for use as
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* encryption keys and similar.
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*
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* @param buf buffer into which the random data will be written
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* @param len size of buf in bytes
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*
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* @retval 0 success, len bytes of random data was written
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* into buf
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* @retval "a negative AVERROR code" random data could not be generated
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*/
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int av_random_bytes(uint8_t *buf, size_t len);
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/**
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* @}
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*/
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#endif /* AVUTIL_RANDOM_SEED_H */
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