hash.hpp

/*
  ANCH Framework: ANother C++ Hack is a C++ framework based on C++11 standard
  Copyright (C) 2012 Vincent Lachenal
 
  This file is part of ANCH Framework.
 
  ANCH Framework is free software: you can redistribute it and/or modify
  it under the terms of the GNU Lesser General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.
 
  ANCH Framework is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU Lesser General Public License for more details.
 
  You should have received a copy of the GNU Lesser General Public License
  along with ANCH Framework.  If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
 
#include <ostream>
#include <array>
#include <cstdint>
 
 
namespace anch::crypto {

  template<std::size_t O, std::size_t B>
  class Hash {
 
  protected:
    std::array<uint8_t,O>* _digest;
 
    // Methods +
  public:
    virtual const std::array<uint8_t,O>& digest() const = 0;

    const std::array<uint8_t,O>& digest(const std::string& data);

    template<std::size_t N>
    const std::array<uint8_t,O>& digest(const std::array<uint8_t,N>& data);

    const std::array<uint8_t,O>& digest(const uint8_t* data, std::size_t len);

    const std::array<uint8_t,O>& digest(std::istream& stream);
 
  protected:
    virtual void reset() = 0;

    virtual void addData(const uint8_t* data, std::size_t len) = 0;

    virtual void finalize() = 0;
    // Methods -
 
 
    // Accessors +
  public:
    inline static constexpr std::size_t getOutputSize() {
      return O;
    }

    inline static constexpr std::size_t getBlockSize() {
      return B;
    }
    // Accessors -
 
  };
 
}

template<std::size_t O, std::size_t B>
std::ostream&
operator << (std::ostream& out, const anch::crypto::Hash<O,B>& hash);
 
#include "crypto/hash/impl/hash.hpp"