MD5Hash.h

// -*- Mode: C++; tab-width: 2; -*-
// vi: set ts=2:
//
// $Id: MD5Hash.h,v 1.1 2005/02/23 13:46:57 oliver Exp $
//

#ifndef BALL_COMMON_MD5HASH_H
#define BALL_COMMON_MD5HASH_H

#ifndef BALL_COMMON_H
#       include <BALL/common.h>
#endif

#ifndef BALL_DATATYPE_STRING_H
# include <BALL/DATATYPE/string.h>
#endif


// Original copyright notice
// MD5.C
// Implementation file for MD5 class
//
// This C++ Class implementation of the original RSA Data Security, Inc.
// MD5 Message-Digest Algorithm is copyright (c) 2002, Gary McNickle.
// All rights reserved.  This software is a derivative of the "RSA Data
//  Security, Inc. MD5 Message-Digest Algorithm"
//
// You may use this software free of any charge, but without any
// warranty or implied warranty, provided that you follow the terms
// of the original RSA copyright, listed below.
//
// Original RSA Data Security, Inc. Copyright notice
//
// Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
// rights reserved.
//
// License to copy and use this software is granted provided that it
// is identified as the "RSA Data Security, Inc. MD5 Message-Digest
// Algorithm" in all material mentioning or referencing this software
// or this function.
// License is also granted to make and use derivative works provided
// that such works are identified as "derived from the RSA Data
// Security, Inc. MD5 Message-Digest Algorithm" in all material
// mentioning or referencing the derived work.
// RSA Data Security, Inc. makes no representations concerning either
// the merchantability of this software or the suitability of this
// software for any particular purpose. It is provided "as is"
// without express or implied warranty of any kind.
// These notices must be retained in any copies of any part of this
// documentation and/or software.

namespace BALL
{
  class MD5Hash
  {

    public:
    typedef unsigned int uint4;
    typedef unsigned short  int uint2;
    typedef unsigned char uchar;

    MD5Hash() { init_(); }
    const uchar* digest() const { return digest_; }
    String asString() const;
    void encode(const String& s);

    private:  

    void  init_();
    void  update_(const uchar* s, Size len);
    void  finalize_();

    void  transform_(const uchar* block);
    void  encode_(uchar* dest, uint4* src, uint4 nLength);
    void  decode_(uint4* dest, const uchar* src, uint4 nLength);


    inline  uint4 rotate_left(uint4 x, uint4 n) { return ((x << n) | (x >> (32-n))); }
    inline  uint4 F(uint4 x, uint4 y, uint4 z) { return ((x & y) | (~x & z)); }
    inline  uint4 G(uint4 x, uint4 y, uint4 z) { return ((x & z) | (y & ~z)); }
    inline  uint4 H(uint4 x, uint4 y, uint4 z) { return (x ^ y ^ z); }
    inline  uint4 I(uint4 x, uint4 y, uint4 z)  { return (y ^ (x | ~z)); }
    inline  void  FF(uint4& a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac)
                     { a += F(b, c, d) + x + ac; a = rotate_left(a, s); a += b; }
    inline  void  GG(uint4& a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac)
                       { a += G(b, c, d) + x + ac; a = rotate_left(a, s); a += b; }
    inline  void  HH(uint4& a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac)
                       { a += H(b, c, d) + x + ac; a = rotate_left(a, s); a += b; }
    inline  void  II(uint4& a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac)
                       { a += I(b, c, d) + x + ac; a = rotate_left(a, s); a += b; }

    uint4   state_[4];
    uint4   count_[2];
    uchar   buffer_[64];
    uchar   digest_[16];
    uchar   finalized_;
    static unsigned char PADDING_[64];
  };

} // namespace BALL

#endif // BALL_COMMON_MD5HASH_H

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