keccak384.hpp

//
// MIT License
//
// Copyright (c) 2017-2018 Thibault Martinez and Simon Ninon
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
//
//

#pragma once

#include <cstdint>
#include <vector>

extern "C" {
#include <KeccakHash.h>
}

namespace IOTA {

namespace Crypto {

class Keccak384 {
public:
  static constexpr unsigned int rate = 832;

  static constexpr unsigned int capacity = 768;

  static constexpr unsigned int hashBitLength = 384;

  static constexpr unsigned int delimitedSuffix = 0x01;

public:
  Keccak384();
  virtual ~Keccak384() = default;

public:
  void reset();

  void absorb(const uint8_t* bytes, size_t size = hashBitLength / 8);

  void squeeze(uint8_t* bytes);

protected:
  virtual bool hashUpdate(const uint8_t* bytes, size_t size);

  virtual bool hashSqueeze(uint8_t* bytes);

  virtual bool hashInitialize(void);

private:
  void initialize();

private:
  Keccak_HashInstance khi_;
};

}  // namespace Crypto

}  // namespace IOTA