digestengine.h

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

//
// DigestEngine.h
//
// $Id: //poco/Main/Foundation/include/Foundation/DigestEngine.h#5 $
//
// Definition of class DigestEngine.
//
// 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.
//


#ifndef Foundation_DigestEngine_INCLUDED
#define Foundation_DigestEngine_INCLUDED


#ifndef Foundation_Foundation_INCLUDED
#include "Foundation/Foundation.h"
#endif
#ifndef STD_VECTOR_INCLUDED
#include <vector>
#define STD_VECTOR_INCLUDED
#endif


Foundation_BEGIN


class Foundation_API DigestEngine
	/// This class is an abstract base class
	/// for all classes implementing a message
	/// digest algorithm, like MD5Engine
	/// and SHA1Engine.
	/// Call update() repeatedly with data to
	/// compute the digest from. When done,
	/// call digest() to obtain the message
	/// digest.
{
public:
	typedef std::vector<unsigned char> Digest;

	DigestEngine();
	virtual ~DigestEngine();
		
	void update(const void* data, unsigned length);
	void update(char data);
	void update(const std::string& data);
		/// Updates the digest with the given data.
		
	virtual unsigned digestLength() const = 0;
		/// Returns the length of the digest in bytes.

	virtual void reset() = 0;
		/// Resets the engine so that a new
		/// digest can be computed.
		
	virtual const Digest& digest() = 0;
		/// Finishes the computation of the digest and
		/// returns the message digest. Resets the engine
		/// and can thus only be called once for every digest.
		/// The returned reference is valid until the next
		/// time digest() is called, or the engine object is destroyed.

	static std::string digestToHex(const Digest& bytes);
		/// Converts a message digest into a string of hexadecimal numbers.

protected:
	virtual void updateImp(const void* data, unsigned length) = 0;
		/// Updates the digest with the given data. Must be implemented
		/// by subclasses.
		
private:
	DigestEngine(const DigestEngine&);
	DigestEngine& operator = (const DigestEngine&);
};


//
// inlines
//


inline void DigestEngine::update(const void* data, unsigned length)
{
	updateImp(data, length);
}


inline void DigestEngine::update(char data)
{
	updateImp(&data, 1);
}


inline void DigestEngine::update(const std::string& data)
{
	updateImp(data.data(), (unsigned) data.size());	
}


Foundation_END


#endif // Foundation_DigestEngine_INCLUDED