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/*
* HMAC_DRBG (SP800-90A)
* (C) 2014,2015,2016 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_HMAC_DRBG_H__
#define BOTAN_HMAC_DRBG_H__
#include <botan/rng.h>
#include <botan/mac.h>
namespace Botan {
/**
* HMAC_DRBG from NIST SP800-90A
*/
class BOTAN_DLL HMAC_DRBG final : public Stateful_RNG
{
public:
/**
* Initialize an HMAC_DRBG instance with the given hash function
*/
HMAC_DRBG(const std::string& hmac_hash,
size_t max_bytes_before_reseed = BOTAN_RNG_MAX_OUTPUT_BEFORE_RESEED);
HMAC_DRBG(MessageAuthenticationCode* hmac,
size_t max_bytes_before_reseed = BOTAN_RNG_MAX_OUTPUT_BEFORE_RESEED);
std::string name() const override;
void clear() override;
void randomize(byte output[], size_t output_len) override;
void randomize_with_input(byte output[], size_t output_len,
const byte input[], size_t input_len) override;
void add_entropy(const byte input[], size_t input_len) override;
private:
void update(const byte input[], size_t input_len);
std::unique_ptr<MessageAuthenticationCode> m_mac;
secure_vector<byte> m_V;
};
}
#endif
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