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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 final : public RandomNumberGenerator
{
public:
std::string name() const override { return system_rng().name(); }
void randomize(uint8_t out[], size_t len) override { system_rng().randomize(out, len); }
void add_entropy(const uint8_t in[], size_t length) override { system_rng().add_entropy(in, length); }
bool is_seeded() const override { return true; }
void clear() override {}
};
}
#endif
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