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/*
* System RNG interface
* (C) 2014,2015 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_SYSTEM_RNG_H__
#define BOTAN_SYSTEM_RNG_H__
#include <botan/rng.h>
namespace Botan {
/**
* Return a shared reference to a global PRNG instance provided by the
* operating system. For instance might be instantiated by /dev/urandom
* or CryptGenRandom.
*/
BOTAN_DLL RandomNumberGenerator& system_rng();
/*
* Instantiatable reference to the system RNG.
*/
class BOTAN_DLL System_RNG : public RandomNumberGenerator
{
public:
System_RNG() : m_rng(system_rng()) {}
void randomize(Botan::byte out[], size_t len) override { m_rng.randomize(out, len); }
bool is_seeded() const override { return m_rng.is_seeded(); }
void clear() override { m_rng.clear(); }
std::string name() const override { return m_rng.name(); }
size_t reseed_with_sources(Entropy_Sources& srcs,
size_t poll_bits,
std::chrono::milliseconds poll_timeout) override
{
return m_rng.reseed_with_sources(srcs, poll_bits, poll_timeout);
}
void add_entropy(const byte in[], size_t len) override { m_rng.add_entropy(in, len); }
private:
Botan::RandomNumberGenerator& m_rng;
};
}
#endif
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