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/*
* Auto Seeded RNG
* (C) 2008,2016 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_AUTO_SEEDING_RNG_H_
#define BOTAN_AUTO_SEEDING_RNG_H_
#include <botan/rng.h>
namespace Botan {
class Stateful_RNG;
/**
* A userspace PRNG
*/
class BOTAN_PUBLIC_API(2,0) AutoSeeded_RNG final : public RandomNumberGenerator
{
public:
void randomize(uint8_t out[], size_t len) override;
void randomize_with_input(uint8_t output[], size_t output_len,
const uint8_t input[], size_t input_len) override;
bool is_seeded() const override;
bool accepts_input() const override { return true; }
/**
* Mark state as requiring a reseed on next use
*/
void force_reseed();
size_t reseed(Entropy_Sources& srcs,
size_t poll_bits = BOTAN_RNG_RESEED_POLL_BITS,
std::chrono::milliseconds poll_timeout = BOTAN_RNG_RESEED_DEFAULT_TIMEOUT) override;
void add_entropy(const uint8_t in[], size_t len) override;
std::string name() const override;
void clear() override;
/**
* Uses the system RNG (if available) or else a default group of
* entropy sources (all other systems) to gather seed material.
*
* @param reseed_interval specifies a limit of how many times
* the RNG will be called before automatic reseeding is performed
*/
AutoSeeded_RNG(size_t reseed_interval = BOTAN_RNG_DEFAULT_RESEED_INTERVAL);
/**
* Create an AutoSeeded_RNG which will get seed material from some other
* RNG instance. For example you could provide a reference to the system
* RNG or a hardware RNG.
*
* @param underlying_rng is a reference to some RNG which will be used
* to perform the periodic reseeding
* @param reseed_interval specifies a limit of how many times
* the RNG will be called before automatic reseeding is performed
*/
AutoSeeded_RNG(RandomNumberGenerator& underlying_rng,
size_t reseed_interval = BOTAN_RNG_DEFAULT_RESEED_INTERVAL);
/**
* Create an AutoSeeded_RNG which will get seed material from a set of
* entropy sources.
*
* @param entropy_sources will be polled to perform reseeding periodically
* @param reseed_interval specifies a limit of how many times
* the RNG will be called before automatic reseeding is performed
*/
AutoSeeded_RNG(Entropy_Sources& entropy_sources,
size_t reseed_interval = BOTAN_RNG_DEFAULT_RESEED_INTERVAL);
/**
* Create an AutoSeeded_RNG which will get seed material from both an
* underlying RNG and a set of entropy sources.
*
* @param underlying_rng is a reference to some RNG which will be used
* to perform the periodic reseeding
* @param entropy_sources will be polled to perform reseeding periodically
* @param reseed_interval specifies a limit of how many times
* the RNG will be called before automatic reseeding is performed
*/
AutoSeeded_RNG(RandomNumberGenerator& underlying_rng,
Entropy_Sources& entropy_sources,
size_t reseed_interval = BOTAN_RNG_DEFAULT_RESEED_INTERVAL);
~AutoSeeded_RNG();
private:
std::unique_ptr<Stateful_RNG> m_rng;
};
}
#endif
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