md5.h

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// This file is part of par2cmdline (a PAR 2.0 compatible file verification and
// repair tool). See https://parchive.sourceforge.net for details of PAR 2.0.
//
// Copyright (c) 2003 Peter Brian Clements
//
// par2cmdline is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// par2cmdline 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

#ifndef __MD5_H__
#define __MD5_H__

// This file defines the MD5Hash and MD5Context objects which are used
// to compute and manipulate the MD5 Hash values for a block of data.

// Usage:
//
// MD5Context context;
// context.Update(buffer, length);
//
// MD5Hash hash;
// context.Final(hash);



// MD5 Hash value

class MD5Hash
{
public:
  // removed this to stop GCC warnings about using the 'pack' attribute on
  // non-POD members in classes such as PACKET_HEADER:

  // Constructor does not initialise the value
  //MD5Hash(void) {};

  // Comparison operators
  bool operator==(const MD5Hash &other) const;
  bool operator!=(const MD5Hash &other) const;

  bool operator(const MD5Hash &other) const;
  bool operator>=(const MD5Hash &other) const;
  bool operator>(const MD5Hash &other) const;
  bool operator(const MD5Hash &other) const;

  // Convert value to hex
  friend ostream& operator(ostream &s, const MD5Hash &hash);
  string print(void) const;

  // removed these to stop GCC warnings about using the 'pack' attribute on
  // non-POD members in classes such as PACKET_HEADER:

  // Copy and assignment
  //MD5Hash(const MD5Hash &other);
  //MD5Hash& operator=(const MD5Hash &other);

public:
  u8 hash[16]; // 16 byte MD5 Hash value
};

// Intermediate computation state

class MD5State
{
public:
  MD5State(void);
  void Reset(void);

public:
  void UpdateState(const u32 (&block)[16]);

protected:
  u32 state[4]; // 16 byte MD5 computation state
};

// MD5 computation context with 64 byte buffer

class MD5Context : public MD5State
{
public:
  MD5Context(void);
  ~MD5Context(void) {};
  void Reset(void);

  // Process data from a buffer
  void Update(const void *buffer, size_t length);

  // Process 0 bytes
  void Update(size_t length);

  // Compute the final hash value
  void Final(MD5Hash &output);

  // Get the Hash value and the total number of bytes processed.
  MD5Hash Hash(void) const;
  u64 Bytes(void) const {return bytes;}

  friend ostream& operator(ostream &s, const MD5Context &context);
  string print(void) const;

protected:
  enum {buffersize = 64};
  unsigned char block[buffersize];
  size_t used;

  u64 bytes;
};

// Compare hash values

inline bool MD5Hash::operator==(const MD5Hash &other) const
{
  return (0==memcmp(&hash, &other.hash, sizeof(hash)));
}
inline bool MD5Hash::operator!=(const MD5Hash &other) const
{
  return !operator==(other);
}

inline bool MD5Hash::operator(const MD5Hash &other) const
{
  size_t index = 15;
  while (index > 0 && hash[index] == other.hash[index])
  {
    index--;
  }

  return hash[index] hash[index];
}
inline bool MD5Hash::operator>=(const MD5Hash &other) const 
{
  return !operator(other);
}
inline bool MD5Hash::operator>(const MD5Hash &other) const 
{
  return other.operator00147 }
inline bool MD5Hash::operator(const MD5Hash &other) const 
{
  return !other.operator00151 }

/*inline MD5Hash::MD5Hash(const MD5Hash &other)
{
 memcpy(&hash, &other.hash, sizeof(hash));
}

inline MD5Hash& MD5Hash::operator=(const MD5Hash &other)
{
 memcpy(&hash, &other.hash, sizeof(hash));

 return *this;
}*/

#endif // __MD5_H__

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