/*

* 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/mac.h>

#include <botan/block_cipher.h>

BOTAN_FUTURE_INTERNAL_HEADER(x919_mac.h)

namespace Botan {

/**

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

*/

class BOTAN_PUBLIC_API(2,0) ANSI_X919_MAC final : public MessageAuthenticationCode

   {

   public:

      void clear() override;

      std::string name() const override;

      size_t output_length() const override { return 8; }

      MessageAuthenticationCode* clone() const override;

      Key_Length_Specification key_spec() const override

         {

         return Key_Length_Specification(8, 16, 8);

         }

      ANSI_X919_MAC();

      ANSI_X919_MAC(const ANSI_X919_MAC&) = delete;

      ANSI_X919_MAC& operator=(const ANSI_X919_MAC&) = delete;

   private:

      void add_data(const uint8_t[], size_t) override;

      void final_result(uint8_t[]) override;

      void key_schedule(const uint8_t[], size_t) override;

      std::unique_ptr<BlockCipher> m_des1, m_des2;

      secure_vector<uint8_t> m_state;

      size_t m_position;

   };

}

#endif