#pragma once
#include <string>

class RandomNumberGenerator
{
private:
	//主方案：OpenSSL，安全随机数，有极小概率失败
	static bool FillWithOpenSSLRandom(unsigned char* dst, size_t len) noexcept;
	//备用方案：std::mt19937_64/时间戳伪随机数，不怎么安全但是一定有数
	static bool FillWithSTDMT19937_64(unsigned char* dst, size_t len) noexcept;
	static std::string Bytes2HexString(const unsigned char* data, size_t len) noexcept;

public:
	static std::string SecureRandomHex(size_t bytes);
};