/*

* Copyright (c) 2006-2009 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the License "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description: 

*

*/

#ifndef __CBCMODESHIM_H__

#define __CBCMODESHIM_H__

#include <cbcmode.h>

/**

@file

@internalComponent

@released

*/

namespace CryptoSpi 

	{

	class CSymmetricCipher;

	}

/**

CBC mode encryptor shim class that delegates all work to CModeCBCEncryptor.

This should only be instantiated by CModeCBCEncryptor::NewLC

*/

NONSHARABLE_CLASS(CModeCBCEncryptorShim) : public CModeCBCEncryptor

{

public:

	/**

	Creates a new CModeCBCEncryptorShim. If the block transfer 

	@param aBT A pointer to the block transform object.

	@param aIV The initialisation vector to use.

	@return A pointer to a CModeCBCEncryptorShim instance or NULL if the block transform

	does not support SPI or the SPI plug-in does not support CBC mode

	*/

	static CModeCBCEncryptorShim* NewL(CBlockTransformation* aBT, const TDesC8& aIV);

	// From CBase

	TInt Extension_(TUint aExtensionId, TAny*& a0, TAny* a1);

	// From CBlockTransformation

	void Reset();

	TInt BlockSize() const;

	TInt KeySize() const;

	void Transform(TDes8& aBlock);	

	// From CBlockChainingMode

	void SetIV(const TDesC8& aIv);

private:

	/// Constructor

	CModeCBCEncryptorShim(CryptoSpi::CSymmetricCipher* aSymmetricCipherImpl);

	// Just invokes ContructL in super-class

	void ConstructL(CBlockTransformation* aBT, const TDesC8& aIv);

	// owned by block transform - iBT

	CryptoSpi::CSymmetricCipher* iSymmetricCipherImpl;		

};

/**

CBC mode decryptor shim class that delegates all work to CModeCBCDecryptor.

This should only be instantiated by CModeCBCDecryptor::NewLC

*/

NONSHARABLE_CLASS(CModeCBCDecryptorShim) : public CModeCBCDecryptor

{

public:

	/**

	Creates a new CModeCBCEncryptorShim.

	@param aBT A pointer to the block transform object.

	@param aIV The initialisation vector to use.

	@return A pointer to a CModeCBCDecryptorShim instance or NULL if the block transform

	does not support SPI or the SPI plug-in does not support CBC mode

	*/

	static CModeCBCDecryptorShim* NewL(CBlockTransformation* aBT, const TDesC8& aIV);

	// From CBase

	TInt Extension_(TUint aExtensionId, TAny*& a0, TAny* a1);

	// From CBlockTransformation

	void Reset();

	TInt BlockSize() const;

	TInt KeySize() const;

	void Transform(TDes8& aBlock);	

	// From CBlockChainingMode

	void SetIV(const TDesC8& aIv);

private:

	/// Constructor

	CModeCBCDecryptorShim(CryptoSpi::CSymmetricCipher* aSymmetricCipherImpl);

	// Just invokes ContructL in super-class

	void ConstructL(CBlockTransformation* aBT, const TDesC8& aIv);

	// owned by block transform - iBT

	CryptoSpi::CSymmetricCipher* iSymmetricCipherImpl;

};

#endif	//	__CBCMODESHIM_H__