/*

* BLAKE2b MAC

* (C) 1999-2007,2014 Jack Lloyd

* (C) 2020           Tom Crowley

*

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

*/

#ifndef BOTAN_BLAKE2MAC_H_

#define BOTAN_BLAKE2MAC_H_

#include <botan/mac.h>

#include <botan/internal/blake2b.h>

namespace Botan {

/**

* BLAKE2b MAC

*/

class BLAKE2bMAC final : public MessageAuthenticationCode

   {

   public:

      explicit BLAKE2bMAC(size_t output_bits = 512);

      BLAKE2bMAC(const BLAKE2bMAC&) = delete;

      BLAKE2bMAC& operator=(const BLAKE2bMAC&) = delete;

      std::string name() const override { return m_blake.name(); }

      size_t output_length() const override { return m_blake.output_length(); }

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

      void clear() override;

      bool has_keying_material() const override { return m_blake.has_keying_material(); }

      Key_Length_Specification key_spec() const override

         {

         return m_blake.key_spec();

         }

   private:

      void key_schedule(const uint8_t key[], size_t length) override

         {

         m_blake.set_key(key, length);

         }

      void add_data(const uint8_t input[], size_t length) override

         {

         assert_key_material_set();

         m_blake.update(input, length);

         }

      void final_result(uint8_t out[]) override

         {

         assert_key_material_set();

         m_blake.final(out);

         }

      BLAKE2b m_blake;

   };

}

#endif