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/*
* HMAC
* (C) 1999-2007,2014 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_HMAC_H__
#define BOTAN_HMAC_H__
#include <botan/mac.h>
#include <botan/hash.h>
namespace Botan {
/**
* HMAC
*/
class BOTAN_DLL HMAC final : public MessageAuthenticationCode
{
public:
void clear() override;
std::string name() const override;
MessageAuthenticationCode* clone() const override;
size_t output_length() const override { return m_hash->output_length(); }
Key_Length_Specification key_spec() const override
{
// Absurd max length here is to support PBKDF2
return Key_Length_Specification(0, 512);
}
/**
* @param hash the hash to use for HMACing
*/
explicit HMAC(HashFunction* hash);
static HMAC* make(const Spec& spec);
HMAC(const HMAC&) = delete;
HMAC& operator=(const HMAC&) = delete;
private:
void add_data(const byte[], size_t) override;
void final_result(byte[]) override;
void key_schedule(const byte[], size_t) override;
std::unique_ptr<HashFunction> m_hash;
secure_vector<byte> m_ikey, m_okey;
};
}
#endif
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