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/*
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* Copyright (c) 2006-2009 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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* ARC4 shim classes definition
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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 ARC4SHIM_H
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#define ARC4SHIM_H
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#include <arc4.h>
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namespace CryptoSpi
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{
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class CCryptoParams;
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class CSymmetricCipher;
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class CKey;
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}
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NONSHARABLE_CLASS(CArc4Shim) : public CARC4
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{
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public:
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/**
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Creates a CArc4Shim object which has the same interface as CARC4
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but delegates all work to a Crypto SPI plug-in.
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@param aKey The key to use. aKey must be less
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than or equal to KRC4MaxKeySizeBytes.
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@param aDiscardBytes The number of bytes to drop from the
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beginning of the key stream.
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@return A pointer to a CArc4Shim instance
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@leave KErrKeyNotWeakEnough If the key size is larger than that
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allowed by the cipher strength
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restrictions of the crypto library.
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See TCrypto::IsSymmetricWeakEnoughL()
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*/
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static CArc4Shim* NewL(const TDesC8& aKey, TUint aDiscardBytes);
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/**
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Creates a CArc4Shim object which has the same interface as CARC4,
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and leave it on the cleanup stack. but delegates all work to a
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Crypto SPI plug-in.
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@param aKey The key to use. aKey must be less
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than or equal to KRC4MaxKeySizeBytes.
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@param aDiscardBytes The number of bytes to drop from the
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beginning of the key stream.
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@return A pointer to a CArc4Shim instance
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@leave KErrKeyNotWeakEnough If the key size is larger than that
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allowed by the cipher strength
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restrictions of the crypto library.
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See TCrypto::IsSymmetricWeakEnoughL()
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*/
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static CArc4Shim* NewLC(const TDesC8& aKey, TUint aDiscardBytes);
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/**
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Destructor
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*/
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~CArc4Shim();
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// From CSymmetricCipher class
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void Reset();
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TInt BlockSize() const;
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TInt KeySize() const;
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void Process(const TDesC8& aInput, TDes8& aOutput);
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void ProcessFinalL(const TDesC8& aInput, TDes8& aOutput);
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TInt MaxOutputLength(TInt aInputLength) const;
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TInt MaxFinalOutputLength(TInt aInputLength) const;
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private:
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/**
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Constructor
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*/
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CArc4Shim();
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/**
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Second Phase Constructor
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*/
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void ConstructL(const TDesC8& aKey, TUint aDiscardBytes);
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private:
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/// SPI delegate
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CryptoSpi::CSymmetricCipher* iSymmetricCipherImpl;
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/// SPI requires all key to passed as key-objects
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CryptoSpi::CKey* iKey;
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CryptoSpi::CCryptoParams* iAlgorithmParams;
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};
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#endif // ARC4SHIM_H
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