sl@0: /*
sl@0: * Copyright (c) 2006-2009 Nokia Corporation and/or its subsidiary(-ies).
sl@0: * All rights reserved.
sl@0: * This component and the accompanying materials are made available
sl@0: * under the terms of the License "Eclipse Public License v1.0"
sl@0: * which accompanies this distribution, and is available
sl@0: * at the URL "http://www.eclipse.org/legal/epl-v10.html".
sl@0: *
sl@0: * Initial Contributors:
sl@0: * Nokia Corporation - initial contribution.
sl@0: *
sl@0: * Contributors:
sl@0: *
sl@0: * Description: 
sl@0: * ARC4 shim classes definition
sl@0: *
sl@0: */
sl@0: 
sl@0: 
sl@0: /**
sl@0:  @file
sl@0:  @internalComponent
sl@0:  @released
sl@0: */
sl@0: 
sl@0: #ifndef ARC4SHIM_H
sl@0: #define ARC4SHIM_H
sl@0: 
sl@0: #include <arc4.h>
sl@0: 
sl@0: namespace CryptoSpi
sl@0: 	{
sl@0: 	class CCryptoParams;
sl@0: 	class CSymmetricCipher;
sl@0: 	class CKey;
sl@0: 	}
sl@0: 	
sl@0: NONSHARABLE_CLASS(CArc4Shim) : public CARC4
sl@0: {
sl@0: public:
sl@0: 	/**
sl@0: 	Creates a CArc4Shim object which has the same interface as CARC4 
sl@0: 	but delegates all work to a Crypto SPI plug-in.
sl@0: 	@param aKey					The key to use. aKey must be less 
sl@0: 								than or equal to KRC4MaxKeySizeBytes.  
sl@0: 	@param aDiscardBytes		The number of bytes to drop from the 
sl@0: 								beginning of the key stream.
sl@0: 	@return						A pointer to a CArc4Shim instance
sl@0: 	@leave KErrKeyNotWeakEnough	If the key size is larger than that 
sl@0: 								allowed by the cipher strength 
sl@0: 								restrictions of the crypto library.
sl@0: 								See TCrypto::IsSymmetricWeakEnoughL()
sl@0: 	*/
sl@0: 	static CArc4Shim* NewL(const TDesC8& aKey, TUint aDiscardBytes);
sl@0: 	
sl@0: 	/**
sl@0: 	Creates a CArc4Shim object which has the same interface as CARC4,
sl@0: 	and leave it on the cleanup stack. but delegates all work to a 
sl@0: 	Crypto SPI plug-in.
sl@0: 	@param aKey					The key to use. aKey must be less 
sl@0: 								than or equal to KRC4MaxKeySizeBytes.  
sl@0: 	@param aDiscardBytes		The number of bytes to drop from the 
sl@0: 								beginning of the key stream.
sl@0: 	@return						A pointer to a CArc4Shim instance
sl@0: 	@leave KErrKeyNotWeakEnough	If the key size is larger than that 
sl@0: 								allowed by the cipher strength 
sl@0: 								restrictions of the crypto library.
sl@0: 								See TCrypto::IsSymmetricWeakEnoughL()
sl@0: 	*/
sl@0: 	static CArc4Shim* NewLC(const TDesC8& aKey, TUint aDiscardBytes);
sl@0: 
sl@0: 	/**
sl@0: 	Destructor
sl@0: 	*/
sl@0: 	~CArc4Shim();
sl@0: 
sl@0: 	// From CSymmetricCipher class
sl@0: 	void Reset();
sl@0: 	TInt BlockSize() const;
sl@0: 	TInt KeySize() const;		
sl@0: 	void Process(const TDesC8& aInput, TDes8& aOutput);
sl@0: 	void ProcessFinalL(const TDesC8& aInput, TDes8& aOutput);
sl@0: 	TInt MaxOutputLength(TInt aInputLength) const;
sl@0: 	TInt MaxFinalOutputLength(TInt aInputLength) const;
sl@0: 
sl@0: private:
sl@0: 	/** 
sl@0: 	Constructor
sl@0: 	*/
sl@0: 	CArc4Shim();
sl@0: 
sl@0: 	/**
sl@0: 	Second Phase Constructor
sl@0: 	*/
sl@0: 	void ConstructL(const TDesC8& aKey, TUint aDiscardBytes);
sl@0: 		
sl@0: private:
sl@0: 	/// SPI delegate
sl@0: 	CryptoSpi::CSymmetricCipher* iSymmetricCipherImpl;
sl@0: 		
sl@0: 	/// SPI requires all key to passed as key-objects
sl@0: 	CryptoSpi::CKey* iKey;
sl@0: 	
sl@0: 	CryptoSpi::CCryptoParams* iAlgorithmParams;
sl@0: };
sl@0: 
sl@0: #endif // ARC4SHIM_H