/*+
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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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* RC2 shim classes definition+
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*+
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*/+
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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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+
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#ifndef __RC2SHIM_H__+
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#define __RC2SHIM_H__+
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+
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#include <rc2.h>+
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+
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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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	+
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NONSHARABLE_CLASS(CRC2EncryptorShim) : public CRC2Encryptor+
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{+
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public:+
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	/**+
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	Creates an CRC2EncryptorShim object which has the same interface+
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	as RC2 Encryptor but delegates all work to a Crypto SPI plug-in.+
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	+
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	@param aKey The encryption key+
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	@return A pointer to a CRC2EncryptorShim instance+
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	*/+
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	static CRC2EncryptorShim* NewL(const TDesC8& aKey, TInt aEffectiveKeyLenBits);+
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	+
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	/**+
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	Creates an CRC2EncryptorShim object which has the same interface+
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	as RC2 Encryptor but delegates all work to a Crypto SPI plug-in.+
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	+
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	A pointer to the new object is placed on the cleanup stack+
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	+
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	@param aKey The encryption key+
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	@return A pointer to a CRC2EncryptorShim instance+
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	*/+
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	static CRC2EncryptorShim* NewLC(const TDesC8& aKey, TInt aEffectiveKeyLenBits);+
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	+
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	// From CBlockTransform+
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	TInt BlockSize() const;+
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	void Transform(TDes8& aBlock);+
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	void Reset(void);+
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	TInt KeySize(void) const;+
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	+
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	/// Destructor+
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	~CRC2EncryptorShim();+
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		+
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private:+
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	/// Constructor+
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	CRC2EncryptorShim();+
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	void ConstructL(const TDesC8& aKey, TInt aEffectiveKeyLenBits);	+
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	+
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	// From CBase+
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	TInt Extension_(TUint aExtensionId, TAny*& a0, TAny* a1);+
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	+
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private:+
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	/// SPI delegate+
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	CryptoSpi::CSymmetricCipher* iSymmetricCipherImpl;+
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		+
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	/// SPI requires all key to passed as key-objects+
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	CryptoSpi::CKey* iKey;		+
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	+
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	/// Temporary output block, SPI does not overwrite input+
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	/// RC2 uses 64bit blocks+
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	TBuf8<16> iOutputBlock;+
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	+
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	/// The effective key length is passed as an algorithm+
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	/// parameter. This allows it to be externalised.+
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	CryptoSpi::CCryptoParams* iAlgorithmParams;	+
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};+
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+
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NONSHARABLE_CLASS(CRC2DecryptorShim) : public CRC2Decryptor+
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{+
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public:+
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	/**+
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	Creates an CRC2DecryptorShim object which has the same interface+
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	as RC2 Decryptor but delegates all work to a Crypto SPI plug-in.+
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	+
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	@param aKey The decryption key+
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	@return A pointer to a CRC2DecryptorShim instance+
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	*/+
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	static CRC2DecryptorShim* NewL(const TDesC8& aKey, TInt aEffectiveKeyLenBits);+
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	+
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	/**+
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	Creates an CRC2DecryptorShim object which has the same interface+
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	as RC2 Decryptor but delegates all work to a Crypto SPI plug-in.+
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	+
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	A pointer to the new object is placed on the cleanup stack+
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	+
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	@param aKey The decryption key+
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	@return A pointer to a CRC2DecryptorShim instance+
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	*/+
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	static CRC2DecryptorShim* NewLC(const TDesC8& aKey, TInt aEffectiveKeyLenBits);+
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	+
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	// From CBlockTransform+
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	TInt BlockSize() const;+
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	void Transform(TDes8& aBlock);+
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	void Reset(void);+
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	TInt KeySize(void) const;+
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	+
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	/// Destructor+
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	~CRC2DecryptorShim();+
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	+
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private:+
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	/// Constructor	+
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	CRC2DecryptorShim();	+
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	void ConstructL(const TDesC8& aKey, TInt aEffectiveKeyLenBits);	+
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	+
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	/**+
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	From CBase, to allow CBufferedTransform & CBlockChainingMode+
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	to determine whether the functionality may be delegated to+
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	the SPI object.+
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	*/ +
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	TInt Extension_(TUint aExtensionId, TAny*& a0, TAny* a1);+
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	+
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private:	+
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	/// SPI delegate+
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	CryptoSpi::CSymmetricCipher* iSymmetricCipherImpl;+
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		+
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	/// SPI requires all key to passed as key-objects+
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	CryptoSpi::CKey* iKey;		+
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	+
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	/// Temporary output block, SPI does not overwrite input+
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	/// RC2 uses 64bit blocks+
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	TBuf8<16> iOutputBlock;+
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	+
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	/// The effective key length is passed as an algorithm+
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	/// parameter. This allows it to be externalised.+
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	CryptoSpi::CCryptoParams* iAlgorithmParams;+
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};+
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+
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#endif // __RC2SHIM_H__+
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