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Quelle random_seed.h Sprache: C |
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/* * Copyright (c) 2009 Baptiste Coudurier <baptiste.coudurier@gmail.com> * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #ifndef AVUTIL_RANDOM_SEED_H #define AVUTIL_RANDOM_SEED_H #include <stddef.h> #include <stdint.h> /** * @addtogroup lavu_crypto * @{ */ /** * Get a seed to use in conjunction with random functions. * This function tries to provide a good seed at a best effort bases. * Its possible to call this function multiple times if more bits are needed. * It can be quite slow, which is why it should only be used as seed for a faster * PRNG. The quality of the seed depends on the platform. */ uint32_t av_get_random_seed(void); /** * Generate cryptographically secure random data, i.e. suitable for use as * encryption keys and similar. * * @param buf buffer into which the random data will be written * @param len size of buf in bytes * * @retval 0 success, len bytes of random data was written * into buf * @retval "a negative AVERROR code" random data could not be generated */ int av_random_bytes(uint8_t *buf, size_t len); /** * @} */ #endif /* AVUTIL_RANDOM_SEED_H */
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2026-04-04