sha1engine.h

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

//
// SHA1.h
//
// $Id: //poco/Main/Foundation/include/Foundation/SHA1Engine.h#5 $
//
// Definition of class SHA1Engine.
//
// Secure Hash Standard SHA-1 algorithm
// (FIPS 180-1, see http://www.itl.nist.gov/fipspubs/fip180-1.htm)
//
// Based on the public domain implementation by Peter C. Gutmann
// on 2 Sep 1992, modified by Carl Ellison to be SHA-1.
//
// 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_SHA1Engine_INCLUDED
#define Foundation_SHA1Engine_INCLUDED


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


Foundation_BEGIN


class Foundation_API SHA1Engine: public DigestEngine
	/// This class implementes the SHA-1 message digest algorithm.
	/// (FIPS 180-1, see http://www.itl.nist.gov/fipspubs/fip180-1.htm)
{
public:
	enum
	{
		BLOCK_SIZE  = 64,
		DIGEST_SIZE = 20
	};

	SHA1Engine();
	~SHA1Engine();
		
	unsigned digestLength() const;
	void reset();
	const DigestEngine::Digest& digest();

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

private:
	void transform();
	static void byteReverse(UInt32* buffer, int byteCount);

	typedef UInt8 BYTE;

	struct Context
	{
		UInt32 digest[5]; // Message digest
		UInt32 countLo;   // 64-bit bit count
		UInt32 countHi;
		UInt32 data[16];  // SHA data buffer
		UInt32 slop;      // # of bytes saved in data[]
	};

	Context _context;
	DigestEngine::Digest _digest;
};


Foundation_END


#endif // Foundation_SHA1Engine_INCLUDED