MD5Sum.h

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/******************************************************************************
 * Copyright (C) 2014 by Ralf Kaestner                                        *
 * ralf.kaestner@gmail.com                                                    *
 *                                                                            *
 * This program is free software; you can redistribute it and/or modify       *
 * it under the terms of the Lesser GNU General Public License as published by*
 * the Free Software Foundation; either version 3 of the License, or          *
 * (at your option) any later version.                                        *
 *                                                                            *
 * This program 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               *
 * Lesser GNU General Public License for more details.                        *
 *                                                                            *
 * You should have received a copy of the Lesser GNU General Public License   *
 * along with this program. If not, see <http://www.gnu.org/licenses/>.       *
 ******************************************************************************/

#ifndef VARIANT_TOPIC_TOOLS_MD5_SUM_H
#define VARIANT_TOPIC_TOOLS_MD5_SUM_H

#include <boost/array.hpp>

#include <ros/ros.h>

namespace variant_topic_tools {
  class MD5Sum {
  public:
    typedef boost::array<uint32_t, 4> Digest;
    
    MD5Sum(const std::string& text = std::string());
    
    MD5Sum(const MD5Sum& src);
    
    ~MD5Sum();

    size_t getNumDigestedBits() const;
    
    Digest getDigest() const;
    
    void update(const std::string& text);
    
    void clear();
    
    void write(std::ostream& stream) const;
    
    std::string toString() const;
    
    MD5Sum& operator<<(const std::string& text);
    
  protected:
    typedef boost::array<uint32_t, 2> Size;
    
    typedef boost::array<uint32_t, 16> Block;
    
    static const Digest initialDigest;
    
    static const boost::array<uint32_t, 64> numBitRotations;
    
    static const boost::array<uint32_t, 64> constants;
    
    static const Block padding;
    
    Digest digest;

    Size numDigestedBits;
    
    Block buffer;
    
    void update(const uint8_t* bytes, size_t numBytes);
        
    static void transform(const Block& block, Digest& digest);
    
    static uint32_t rotateLeft(uint32_t value, size_t numBits);
    
    static void update(Digest& digest, Size& numDigestedBits, Block& buffer,
      const uint8_t* bytes, size_t numBytes);
    
    static void finalize(Digest& digest, Size& numDigestedBits, Block& buffer);
  };
    
  std::ostream& operator<<(std::ostream& stream, const MD5Sum& md5Sum);
};

#endif