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/*
* GMAC
* (C) 2016 Matthias Gierlings, René Korthaus
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_GMAC_H__
#define BOTAN_GMAC_H__
#include <botan/gcm.h>
#include <botan/mac.h>
#include <botan/types.h>
#include <algorithm>
namespace Botan {
/**
* GMAC
*/
class BOTAN_DLL GMAC : public MessageAuthenticationCode,
public GHASH
{
public:
void clear() override;
std::string name() const override;
size_t output_length() const override;
MessageAuthenticationCode* clone() const override;
/**
* Must be called to set the initialization vector prior to GMAC
* calculation.
*
* @param nonce Initialization vector.
* @param nonce_len size of initialization vector.
*/
void start(const byte nonce[], size_t nonce_len);
/**
* Must be called to set the initialization vector prior to GMAC
* calculation.
*
* @param nonce Initialization vector.
*/
void start(const secure_vector<byte>& nonce);
/**
* Must be called to set the initialization vector prior to GMAC
* calculation.
*
* @param nonce Initialization vector.
*/
void start(const std::vector<byte>& nonce);
Key_Length_Specification key_spec() const
{
return m_cipher->key_spec();
}
/**
* Creates a new GMAC instance.
*
* @param cipher the underlying block cipher to use
*/
explicit GMAC(BlockCipher* cipher);
GMAC(const GMAC&) = delete;
GMAC& operator=(const GMAC&) = delete;
private:
void add_data(const byte[], size_t) override;
void final_result(byte[]) override;
void start_msg(const byte nonce[], size_t nonce_len);
void key_schedule(const byte key[], size_t size) override;
static const size_t GCM_BS = 16;
secure_vector<byte> m_aad_buf;
std::unique_ptr<BlockCipher> m_cipher;
bool m_initialized;
};
}
#endif
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