1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/os/security/crypto/weakcrypto/source/bigint/mont.h	Fri Jun 15 03:10:57 2012 +0200
     1.3 @@ -0,0 +1,59 @@
     1.4 +/*
     1.5 +* Copyright (c) 2003-2009 Nokia Corporation and/or its subsidiary(-ies).
     1.6 +* All rights reserved.
     1.7 +* This component and the accompanying materials are made available
     1.8 +* under the terms of the License "Eclipse Public License v1.0"
     1.9 +* which accompanies this distribution, and is available
    1.10 +* at the URL "http://www.eclipse.org/legal/epl-v10.html".
    1.11 +*
    1.12 +* Initial Contributors:
    1.13 +* Nokia Corporation - initial contribution.
    1.14 +*
    1.15 +* Contributors:
    1.16 +*
    1.17 +* Description: 
    1.18 +* CMontgomeryStructure class implementation
    1.19 +*
    1.20 +*/
    1.21 +
    1.22 +
    1.23 +/**
    1.24 + @file 
    1.25 + @internalComponent
    1.26 +*/
    1.27 + 
    1.28 +#ifndef __MONT_H__
    1.29 +#define __MONT_H__
    1.30 +
    1.31 +class TInteger;
    1.32 +class RInteger;
    1.33 +
    1.34 +/** A special representation of integers allowing efficient multiplication
    1.35 + * and exponentiation under special conditions.
    1.36 + * @internalComponent
    1.37 + */
    1.38 +class CMontgomeryStructure : public CBase
    1.39 +	{
    1.40 +public:
    1.41 +	static CMontgomeryStructure* NewL(const TInteger& aModulus);
    1.42 +	static CMontgomeryStructure* NewLC(const TInteger& aModulus);
    1.43 +	~CMontgomeryStructure();
    1.44 +	const TInteger& ReduceL(const TInteger& aInteger) const;
    1.45 +	const TInteger& MultiplyL(const TInteger& aA, const TInteger& aB) const;
    1.46 +	const TInteger& ExponentiateL(const TInteger& aBase, const TInteger& aExponent) const;
    1.47 +	const TInteger& SquareL(const TInteger& aA) const;
    1.48 +protected:
    1.49 +	void DoMultiplyL(TInteger& aResult, const TInteger& aA, const TInteger& aB) const;
    1.50 +	void DoSquareL(TInteger& aResult, const TInteger& aA) const;
    1.51 +	TInteger& ConvertInL(TInteger& aInteger) const;
    1.52 +	TInteger& ConvertOutL(TInteger& aInteger) const;
    1.53 +	CMontgomeryStructure();
    1.54 +private:
    1.55 +	void ConstructL(const TInteger& aModulus);
    1.56 +	RInteger iModulus;
    1.57 +	RInteger iModulusInv;
    1.58 +	RInteger iWorkspace;
    1.59 +	mutable RInteger iResult;
    1.60 +	};
    1.61 +
    1.62 +#endif // __MONT_H__