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random.h
/* * Copyright (C) Internet Systems Consortium, Inc. ("ISC") * * This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, you can obtain one at https://mozilla.org/MPL/2.0/. * * See the COPYRIGHT file distributed with this work for additional * information regarding copyright ownership. */ #pragma once #include <inttypes.h> #include <stdlib.h> #include <isc/lang.h> #include <isc/types.h> /*! \file isc/random.h * \brief Implements wrapper around a non-cryptographically secure * pseudo-random number generator. * */ ISC_LANG_BEGINDECLS uint8_t isc_random8(void); /*!< * \brief Returns a single 8-bit random value. */ uint16_t isc_random16(void); /*!< * \brief Returns a single 16-bit random value. */ uint32_t isc_random32(void); /*!< * \brief Returns a single 32-bit random value. */ void isc_random_buf(void *buf, size_t buflen); /*!< * \brief Fills the region buf of length buflen with random data. */ uint32_t isc_random_uniform(uint32_t upper_bound); /*!< * \brief Will return a single 32-bit value, uniformly distributed but * less than upper_bound. This is recommended over * constructions like ``isc_random() % upper_bound'' as it * avoids "modulo bias" when the upper bound is not a power of * two. In the worst case, this function may require multiple * iterations to ensure uniformity. */ ISC_LANG_ENDDECLS