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73 lines
2.9 KiB
C++
73 lines
2.9 KiB
C++
/*******************************************************************************
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* util/bdrandom.h *
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* *
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* BitDHT: An Flexible DHT library. *
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* *
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* Copyright (C) 2010 Cyril Soler <csoler@users.sourceforge.net> *
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* *
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* This program is free software: you can redistribute it and/or modify *
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* it under the terms of the GNU Affero General Public License as *
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* published by the Free Software Foundation, either version 3 of the *
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* License, or (at your option) any later version. *
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* *
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* This program 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 *
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* GNU Affero General Public License for more details. *
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* *
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* You should have received a copy of the GNU Affero General Public License *
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* along with this program. If not, see <https://www.gnu.org/licenses/>. *
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* *
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*******************************************************************************/
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#ifndef BITDHT_UTILS_BDRANDOM_H
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#define BITDHT_UTILS_BDRANDOM_H
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/* This Source Code is basically a direct copy of libretroshare's RsRandom.
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* the function names have just been renamed. drbob
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*/
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// bdRandom contains a random number generator that is
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// - thread safe
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// - system independant
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// - fast
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// - NOT CRYPTOGRAPHICALLY SAFE
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// - DO NOT USE FOR ANYTHING REQUIRING STRONG UNPREDICTABLE RANDOMNESS
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//
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// The implementation is adapted from the Mersenne Twister page of Wikipedia.
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//
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// http://en.wikipedia.org/wiki/Mersenne_twister
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// FIXME(ben): MT is not cryptographically safe.
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#include <vector>
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#include "util/bdthreads.h"
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class bdRandom
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{
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public:
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static uint32_t random_u32() ;
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static uint64_t random_u64() ;
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static float random_f32() ;
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static double random_f64() ;
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static bool seed(uint32_t s) ;
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static std::string random_alphaNumericString(uint32_t length) ;
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private:
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static bdMutex rndMtx ;
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static const uint32_t N = 624;
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static const uint32_t M = 397;
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static const uint32_t MATRIX_A = 0x9908b0dfUL;
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static const uint32_t UMASK = 0x80000000UL;
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static const uint32_t LMASK = 0x7fffffffUL;
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static void locked_next_state() ;
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static uint32_t index ;
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static std::vector<uint32_t> MT ;
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};
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#endif
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