rng.h


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#pragma once

#include <string>
#include <cstdint>

class Rng{
public:
	virtual uint32_t get()=0;
	virtual uint32_t get_uniform(uint32_t upbound)=0;
};

class KeyRng : public Rng{
	uint8_t *key;
	int keylen;
	int idx;
	uint64_t state;

	void stir();

public:
	//throws invalid_argument if keylen<=0
	KeyRng(const char *key,int keylen);
	explicit KeyRng(const std::string &key);

	KeyRng(const Rng&)=delete; //just keep it at one KeyRng please
	~KeyRng();

	uint32_t get();
	uint32_t get_uniform(uint32_t upbound);
};

class CryptoRng : public Rng{
public:
	uint32_t get();
	uint32_t get_uniform(uint32_t upbound);
};