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c2ec99ba8e
* thread safe InsecureRand class * remove GetInsecureRand, use GetRandInt for performance non-critical parts
78 lines
2.0 KiB
C++
78 lines
2.0 KiB
C++
// Copyright (c) 2009-2010 Satoshi Nakamoto
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// Copyright (c) 2009-2014 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#ifndef BITCOIN_RANDOM_H
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#define BITCOIN_RANDOM_H
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#include "uint256.h"
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#include <stdint.h>
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/**
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* Seed OpenSSL PRNG with additional entropy data
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*/
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void RandAddSeed();
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void RandAddSeedPerfmon();
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/**
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* Functions to gather random data via the OpenSSL PRNG
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*/
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void GetRandBytes(unsigned char* buf, int num);
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uint64_t GetRand(uint64_t nMax);
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int GetRandInt(int nMax);
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uint256 GetRandHash();
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/**
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* Seed insecure_rand using the random pool.
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* @param Deterministic Use a deterministic seed
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*/
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void seed_insecure_rand(bool fDeterministic = false);
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/**
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* MWC RNG of George Marsaglia
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* This is intended to be fast. It has a period of 2^59.3, though the
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* least significant 16 bits only have a period of about 2^30.1.
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*
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* @return random value
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*/
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extern uint32_t insecure_rand_Rz;
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extern uint32_t insecure_rand_Rw;
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static inline uint32_t insecure_rand(void)
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{
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insecure_rand_Rz = 36969 * (insecure_rand_Rz & 65535) + (insecure_rand_Rz >> 16);
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insecure_rand_Rw = 18000 * (insecure_rand_Rw & 65535) + (insecure_rand_Rw >> 16);
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return (insecure_rand_Rw << 16) + insecure_rand_Rz;
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}
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/**
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* PRNG initialized from secure entropy based RNG
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*/
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class InsecureRand
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{
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private:
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uint32_t nRz;
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uint32_t nRw;
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bool fDeterministic;
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public:
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InsecureRand(bool _fDeterministic = false);
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/**
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* MWC RNG of George Marsaglia
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* This is intended to be fast. It has a period of 2^59.3, though the
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* least significant 16 bits only have a period of about 2^30.1.
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*
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* @return random value < nMax
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*/
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int64_t operator()(int64_t nMax)
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{
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nRz = 36969 * (nRz & 65535) + (nRz >> 16);
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nRw = 18000 * (nRw & 65535) + (nRw >> 16);
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return ((nRw << 16) + nRz) % nMax;
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}
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};
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#endif // BITCOIN_RANDOM_H
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