/*

* Poly1305

* (C) 2014 Jack Lloyd

*

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

*/

#ifndef BOTAN_MAC_POLY1305_H_

#define BOTAN_MAC_POLY1305_H_

#include <botan/mac.h>

#include <memory>

BOTAN_FUTURE_INTERNAL_HEADER(poly1305.h)

namespace Botan {

/**

* DJB's Poly1305

* Important note: each key can only be used once

*/

class BOTAN_PUBLIC_API(2,0) Poly1305 final : public MessageAuthenticationCode

   {

   public:

      std::string name() const override { return "Poly1305"; }

      MessageAuthenticationCode* clone() const override { return new Poly1305; }

      void clear() override;

      size_t output_length() const override { return 16; }

      Key_Length_Specification key_spec() const override

         {

         return Key_Length_Specification(32);

         }

   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;

      secure_vector<uint64_t> m_poly;

      secure_vector<uint8_t> m_buf;

      size_t m_buf_pos = 0;

   };

}

#endif