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/*
* ANSI X9.31 RNG
* (C) 1999-2009 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_ANSI_X931_RNG_H__
#define BOTAN_ANSI_X931_RNG_H__
#include <botan/rng.h>
#include <botan/block_cipher.h>
namespace Botan {
/**
* ANSI X9.31 RNG
*/
class BOTAN_DLL ANSI_X931_RNG : public RandomNumberGenerator
{
public:
void randomize(byte[], size_t);
bool is_seeded() const;
void clear();
std::string name() const;
void reseed(size_t poll_bits);
void add_entropy(const byte[], size_t);
/**
* @param cipher the block cipher to use in this PRNG
* @param rng the underlying PRNG for generating inputs
* (eg, an HMAC_RNG)
*/
ANSI_X931_RNG(BlockCipher* cipher,
RandomNumberGenerator* rng);
private:
void rekey();
void update_buffer();
std::unique_ptr<BlockCipher> m_cipher;
std::unique_ptr<RandomNumberGenerator> m_prng;
secure_vector<byte> m_V, m_R;
size_t m_R_pos;
};
}
#endif
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