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/*
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* Copyright (c) 2003-2009 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of the License "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description:
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* CMontgomeryStructure class implementation
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*
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*/
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/**
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@file
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@internalComponent
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*/
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#ifndef __MONT_H__
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#define __MONT_H__
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class TInteger;
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class RInteger;
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/** A special representation of integers allowing efficient multiplication
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* and exponentiation under special conditions.
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* @internalComponent
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*/
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class CMontgomeryStructure : public CBase
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{
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public:
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static CMontgomeryStructure* NewL(const TInteger& aModulus);
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IMPORT_C static CMontgomeryStructure* NewLC(const TInteger& aModulus);
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~CMontgomeryStructure();
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const TInteger& ReduceL(const TInteger& aInteger) const;
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const TInteger& MultiplyL(const TInteger& aA, const TInteger& aB) const;
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IMPORT_C const TInteger& ExponentiateL(const TInteger& aBase, const TInteger& aExponent) const;
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const TInteger& SquareL(const TInteger& aA) const;
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protected:
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void DoMultiplyL(TInteger& aResult, const TInteger& aA, const TInteger& aB) const;
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void DoSquareL(TInteger& aResult, const TInteger& aA) const;
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TInteger& ConvertInL(TInteger& aInteger) const;
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TInteger& ConvertOutL(TInteger& aInteger) const;
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CMontgomeryStructure();
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private:
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void ConstructL(const TInteger& aModulus);
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RInteger iModulus;
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RInteger iModulusInv;
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RInteger iWorkspace;
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mutable RInteger iResult;
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};
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#endif // __MONT_H__
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