/*

* Copyright (c) 2003-2009 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the License "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description: 

* CMontgomeryStructure class implementation

*

*/

/**

 @file 

 @internalComponent

*/

#ifndef __MONT_H__

#define __MONT_H__

class TInteger;

class RInteger;

/** A special representation of integers allowing efficient multiplication

 * and exponentiation under special conditions.

 * @internalComponent

 */

class CMontgomeryStructure : public CBase

	{

public:

	static CMontgomeryStructure* NewL(const TInteger& aModulus);

	IMPORT_C static CMontgomeryStructure* NewLC(const TInteger& aModulus);

	~CMontgomeryStructure();

	const TInteger& ReduceL(const TInteger& aInteger) const;

	const TInteger& MultiplyL(const TInteger& aA, const TInteger& aB) const;

	IMPORT_C const TInteger& ExponentiateL(const TInteger& aBase, const TInteger& aExponent) const;

	const TInteger& SquareL(const TInteger& aA) const;

protected:

	void DoMultiplyL(TInteger& aResult, const TInteger& aA, const TInteger& aB) const;

	void DoSquareL(TInteger& aResult, const TInteger& aA) const;

	TInteger& ConvertIn(TInteger& aInteger) const;

	TInteger& ConvertOutL(TInteger& aInteger) const;

	CMontgomeryStructure();

private:

	void ConstructL(const TInteger& aModulus);

	RInteger iModulus;

	RInteger iModulusInv;

	RInteger iWorkspace;

	mutable RInteger iResult;

	};

#endif // __MONT_H__