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/*
* HMAC_DRBG (SP800-90A)
* (C) 2014 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#ifndef BOTAN_HMAC_DRBG_H__
#define BOTAN_HMAC_DRBG_H__
#include <botan/rng.h>
#include <botan/mac.h>
namespace Botan {
/**
* HMAC_DRBG (SP800-90A)
*/
class BOTAN_DLL HMAC_DRBG : public RandomNumberGenerator
{
public:
void randomize(byte buf[], size_t buf_len);
bool is_seeded() const;
void clear();
std::string name() const;
void reseed(size_t poll_bits);
void add_entropy(const byte input[], size_t input_len);
/**
* @param mac the underlying mac function (eg HMAC(SHA-512))
* @param underlying_rng RNG used generating inputs (eg HMAC_RNG)
*/
HMAC_DRBG(MessageAuthenticationCode* mac,
RandomNumberGenerator* underlying_rng);
private:
void update(const byte input[], size_t input_len);
std::unique_ptr<MessageAuthenticationCode> m_mac;
std::unique_ptr<RandomNumberGenerator> m_prng;
secure_vector<byte> m_K, m_V;
size_t m_reseed_counter;
};
}
#endif
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