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/*
* GMAC
* (C) 2016 Matthias Gierlings, René Korthaus
* (C) 2017 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_GMAC_H_
#define BOTAN_GMAC_H_
#include <botan/mac.h>
namespace Botan {
class BlockCipher;
class GHASH;
/**
* GMAC
*
* GMAC requires a unique initialization vector be used for each message.
* This must be provided via the MessageAuthenticationCode::start() API
*/
class GMAC final : public MessageAuthenticationCode
{
public:
void clear() override;
std::string name() const override;
size_t output_length() const override;
MessageAuthenticationCode* clone() const override;
Key_Length_Specification key_spec() const override;
/**
* 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;
~GMAC();
private:
void add_data(const uint8_t[], size_t) override;
void final_result(uint8_t[]) override;
void start_msg(const uint8_t nonce[], size_t nonce_len) override;
void key_schedule(const uint8_t key[], size_t size) override;
static const size_t GCM_BS = 16;
std::unique_ptr<BlockCipher> m_cipher;
std::unique_ptr<GHASH> m_ghash;
secure_vector<uint8_t> m_aad_buf;
size_t m_aad_buf_pos;
bool m_initialized;
};
}
#endif
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