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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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*
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*/
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/**
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@file
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@internalComponent
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@released
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*/
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#ifndef __RSAFUNCTION_H__
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#define __RSAFUNCTION_H__
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#include <e32base.h>
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#include "keys.h"
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using namespace CryptoSpi;
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class TInteger;
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class RSAFunction
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{
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public:
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static inline TBool IsInputValid(const TInteger& aInput,
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const TInteger& aModulus);
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static inline void IsInputValidL(const TInteger& aInput,
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const TInteger& aModulus);
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static void EncryptL(const CKey& aPublicKey,
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const TInteger& aInput, RInteger& aOutput);
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static void DecryptL(const CKey& aPrivateKey,
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const TInteger& aInput, RInteger& aOutput);
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static void SignL(const CKey& aPrivateKey,
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const TInteger& aInput, RInteger& aOutput);
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static void VerifyL(const CKey& aPublicKey,
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const TInteger& aInput, RInteger& aOutput);
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private:
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static void FunctionL(const TInteger& aModulus, const TInteger& aExponent,
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const TInteger& aBase, RInteger& aOutput);
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static void FunctionCRTL(const CKey& aPrivateKey,
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const TInteger& aInput, RInteger& aOutput);
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private:
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RSAFunction(void);
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};
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/** Computes whether a given message representative is within the valid bounds
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* for a given modulus, i.e. whether the message is representative within [0,n-1].
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* @param aInput The message representative.
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* @param aModulus The modulus.
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* @return TBool representing whether or not the message representative is
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* valid.
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*/
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TBool RSAFunction::IsInputValid(const TInteger& aInput,
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const TInteger& aModulus)
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{
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//See HAC 8.3 1.b
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//Message (input) must be in the interval [0,n-1] (inclusive)
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if( aInput.IsNegative() || aInput >= aModulus )
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return EFalse;
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else
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return ETrue;
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}
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void RSAFunction::IsInputValidL(const TInteger& aInput,
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const TInteger& aModulus)
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{
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if(!IsInputValid(aInput, aModulus))
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User::Leave(KErrArgument);
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}
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#endif
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