/*******************************************************************************
 * libretroshare/src/util: rsrandom.h                                          *
 *                                                                             *
 * libretroshare: retroshare core library                                      *
 *                                                                             *
 *  Copyright (C) 2010 Cyril Soler <csoler@users.sourceforge.net>              *
 *                                                                             *
 * This program is free software: you can redistribute it and/or modify        *
 * it under the terms of the GNU Lesser General Public License as              *
 * published by the Free Software Foundation, either version 3 of the          *
 * License, or (at your option) any later version.                             *
 *                                                                             *
 * This program is distributed in the hope that it will be useful,             *
 * but WITHOUT ANY WARRANTY; without even the implied warranty of              *
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the                *
 * GNU Lesser General Public License for more details.                         *
 *                                                                             *
 * You should have received a copy of the GNU Lesser General Public License    *
 * along with this program. If not, see <https://www.gnu.org/licenses/>.       *
 *                                                                             *
 *******************************************************************************/
#pragma once

// RSRandom contains a random number generator that is
// - thread safe
// - system independant
// - fast
// - CRYPTOGRAPHICALLY SAFE, because it is based on openssl random number generator

#include <vector>
#include <util/rsthreads.h>

class RSRandom
{
	public:
		static uint32_t random_u32() ;
		static uint64_t random_u64() ;
		static float 	random_f32() ;
		static double	random_f64() ;

		static bool     seed(uint32_t s) ;

		static std::string random_alphaNumericString(uint32_t length) ; 
		static void random_bytes(unsigned char *data,uint32_t length) ; 

	private:
		static RsMutex rndMtx ;

		static const uint32_t N = 1024;

		static void locked_next_state() ;
		static uint32_t index ;
		static std::vector<uint32_t> MT ;
};