/*

* CMAC

* (C) 1999-2007,2014 Jack Lloyd

*

* Botan is released under the Simplified BSD License (see license.txt)

*/

#ifndef BOTAN_CMAC_H_

#define BOTAN_CMAC_H_

#include <botan/block_cipher.h>

#include <botan/mac.h>

namespace Botan {

/**

* CMAC, also known as OMAC1

*/

class CMAC final : public MessageAuthenticationCode {

   public:

      std::string name() const override;

      size_t output_length() const override { return m_block_size; }

      std::unique_ptr<MessageAuthenticationCode> new_object() const override;

      void clear() override;

      bool has_keying_material() const override;

      Key_Length_Specification key_spec() const override { return m_cipher->key_spec(); }

      /**

      * @param cipher the block cipher to use

      */

      explicit CMAC(std::unique_ptr<BlockCipher> cipher);

      CMAC(const CMAC&) = delete;

      CMAC& operator=(const CMAC&) = delete;

   private:

      void add_data(std::span<const uint8_t>) override;

      void final_result(std::span<uint8_t>) override;

      void key_schedule(std::span<const uint8_t>) override;

      std::unique_ptr<BlockCipher> m_cipher;

      secure_vector<uint8_t> m_buffer, m_state, m_B, m_P;

      const size_t m_block_size;

      size_t m_position;

};

}  // namespace Botan

#endif