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/*************************************************
* RandomNumberGenerator Header File *
* (C) 1999-2008 Jack Lloyd *
*************************************************/
#ifndef BOTAN_RANDOM_NUMBER_GENERATOR__
#define BOTAN_RANDOM_NUMBER_GENERATOR__
#include <botan/exceptn.h>
namespace Botan {
/*************************************************
* Entropy Source *
*************************************************/
class BOTAN_DLL EntropySource
{
public:
virtual u32bit slow_poll(byte[], u32bit) = 0;
virtual u32bit fast_poll(byte[], u32bit);
virtual ~EntropySource() {}
};
/*************************************************
* Random Number Generator *
*************************************************/
class BOTAN_DLL RandomNumberGenerator
{
public:
static RandomNumberGenerator* make_rng();
virtual void randomize(byte[], u32bit) = 0;
virtual bool is_seeded() const = 0;
virtual void clear() throw() = 0;
byte next_byte();
virtual void reseed() {}
virtual void add_entropy_source(EntropySource*) = 0;
virtual void add_entropy(const byte[], u32bit) = 0;
RandomNumberGenerator() {}
virtual ~RandomNumberGenerator() {}
private:
RandomNumberGenerator(const RandomNumberGenerator&) {}
RandomNumberGenerator& operator=(const RandomNumberGenerator&)
{ return (*this); }
};
/*************************************************
* Null Random Number Generator *
*************************************************/
class BOTAN_DLL Null_RNG : public RandomNumberGenerator
{
public:
void randomize(byte[], u32bit) { throw PRNG_Unseeded("Null_RNG"); }
void clear() throw() {};
bool is_seeded() const { return false; }
void add_entropy(const byte[], u32bit) {}
void add_entropy_source(EntropySource* es) { delete es; }
};
}
#endif
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