random.h
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random.h
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	// Copyright (c) 2009-2010 Satoshi Nakamoto
	// Copyright (c) 2009-2014 The Bitcoin developers
	// Distributed under the MIT/X11 software license, see the accompanying
	// file COPYING or http://www.opensource.org/licenses/mit-license.php.

	#ifndef BITCOIN_RANDOM_H
	#define BITCOIN_RANDOM_H

	#include "uint256.h"

	#include <stdint.h>

	/**
	* Seed OpenSSL PRNG with additional entropy data
	*/
	void RandAddSeed();
	void RandAddSeedPerfmon();

	/**
	* Functions to gather random data via the OpenSSL PRNG
	*/
	bool GetRandBytes(unsigned char* buf, int num);
	uint64_t GetRand(uint64_t nMax);
	int GetRandInt(int nMax);
	uint256 GetRandHash();

	/**
	* Seed insecure_rand using the random pool.
	* @param Deterministic Use a determinstic seed
	*/
	void seed_insecure_rand(bool fDeterministic = false);

	/**
	* MWC RNG of George Marsaglia
	* This is intended to be fast. It has a period of 2^59.3, though the
	* least significant 16 bits only have a period of about 2^30.1.
	*
	* @return random value
	*/
	extern uint32_t insecure_rand_Rz;
	extern uint32_t insecure_rand_Rw;
	static inline uint32_t insecure_rand(void)
	{
	insecure_rand_Rz = 36969 * (insecure_rand_Rz & 65535) + (insecure_rand_Rz >> 16);
	insecure_rand_Rw = 18000 * (insecure_rand_Rw & 65535) + (insecure_rand_Rw >> 16);
	return (insecure_rand_Rw << 16) + insecure_rand_Rz;
	}

	#endif // BITCOIN_RANDOM_H