/*

* ANSI X9.19 MAC

* (C) 1999-2007 Jack Lloyd

*

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

*/

#ifndef BOTAN_ANSI_X919_MAC_H_

#define BOTAN_ANSI_X919_MAC_H_

#include <botan/block_cipher.h>

#include <botan/mac.h>

namespace Botan {

/**

* DES/3DES-based MAC from ANSI X9.19

*/

class ANSI_X919_MAC final : public MessageAuthenticationCode {

   public:

      void clear() override;

      std::string name() const override;

      size_t output_length() const override { return 8; }

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

      Key_Length_Specification key_spec() const override { return Key_Length_Specification(8, 16, 8); }

      bool has_keying_material() const override;

      ANSI_X919_MAC();

      ANSI_X919_MAC(const ANSI_X919_MAC&) = delete;

      ANSI_X919_MAC& operator=(const ANSI_X919_MAC&) = 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_des1, m_des2;

      secure_vector<uint8_t> m_state;

      size_t m_position;

};

}  // namespace Botan

#endif