md5engine.h

This software aims to create an applet and panel tools to manage a wireless interface card, such as

//
// MD5Engine.h
//
// $Id: //poco/Main/Foundation/include/Foundation/MD5Engine.h#5 $
//
// Definition of class MD5Engine.
//
// Copyright (c) 2004, Guenter Obiltschnig/Applied Informatics.
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// 
// 1. Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
// 
// 2. Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in the
//    documentation and/or other materials provided with the distribution.
// 
// 3. Redistributions in any form must be accompanied by information on
//    how to obtain complete source code for this software and any
//    accompanying software that uses this software.  The source code
//    must either be included in the distribution or be available for no
//    more than the cost of distribution plus a nominal fee, and must be
//    freely redistributable under reasonable conditions.  For an
//    executable file, complete source code means the source code for all
//    modules it contains.  It does not include source code for modules or
//    files that typically accompany the major components of the operating
//    system on which the executable file runs.
// 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
// COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
// ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//
//
// MD5 (RFC 1321) algorithm:
// 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.
//


#ifndef Foundation_MD5Engine_INCLUDED
#define Foundation_MD5Engine_INCLUDED


#ifndef Foundation_Foundation_INCLUDED
#include "Foundation/Foundation.h"
#endif
#ifndef Foundation_DigestEngine_INCLUDED
#include "Foundation/DigestEngine.h"
#endif


Foundation_BEGIN


class Foundation_API MD5Engine: public DigestEngine
	/// This class implementes the MD5 message digest algorithm,
	/// described in RFC 1321.
{
public:
	enum
	{
		BLOCK_SIZE  = 64,
		DIGEST_SIZE = 16
	};

	MD5Engine();
	~MD5Engine();
		
	unsigned digestLength() const;
	void reset();
	const DigestEngine::Digest& digest();

protected:
	void updateImp(const void* data, unsigned length);

private:
	static void transform(UInt32 state[4], const unsigned char block[64]);
	static void encode(unsigned char* output, const UInt32* input, unsigned int len);
	static void decode(UInt32* output, const unsigned char* input, unsigned int len);

	struct Context
	{
		UInt32 state[4];          // state (ABCD)
		UInt32 count[2];          // number of bits, modulo 2^64 (lsb first)
		unsigned char buffer[64]; // input buffer
	};

	Context _context;
	DigestEngine::Digest _digest;
};


Foundation_END


#endif // Foundation_MD5Engine_INCLUDED