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52 lines
1.5 KiB
52 lines
1.5 KiB
// 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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/* Seed OpenSSL PRNG with additional entropy data */ |
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void RandAddSeed(); |
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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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* Function to gather random data from multiple sources, failing whenever any |
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* of those source fail to provide a result. |
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*/ |
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void GetStrongRandBytes(unsigned char* buf, int num); |
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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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#endif // BITCOIN_RANDOM_H
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