/*

* Copyright (c) 2002-2009 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: 

* ** IMPORTANT ** PublishedPartner API's in this file are published to 3rd party developers via the 

* Symbian website. Changes to these API's should be treated as PublishedAll API changes and the Security TA should be consulted.

* CBlockTransformation class implementation

*

*/

/**

 @file 

 @publishedPartner

 @released 

*/

#ifndef	BLOCKTRANSFORMATION_H__

#define	BLOCKTRANSFORMATION_H__

#include <e32base.h>

#ifndef SYMBIAN_ENABLE_SPLIT_HEADERS

/** The maximum block size supported (in bytes) */

const TUint KMaxBlockSizeSupported = 32;

#endif

/**

* Abstract base class defining the interface to block transformation schemes.

*

* Block transformation schemes process a fixed-size block of input to return a

* block of output the same size.  

*

*/

class CBlockTransformation : public CBase

{

public:

	/**

	* Transforms the supplied block, returning the new value using the same

	* parameter. aBlock.Size() must be the same length as BlockSize().

	*

	* @param aBlock	On input, the data to be transformed;

	*				on return, the data after transformation.

	*/

	virtual void Transform(TDes8& aBlock) = 0;

	/**

	* Resets the transformation back to its original state. Clears all its buffers.

	*/	

	virtual void Reset() = 0;

	/**

	* Gets the block size in bytes.

	*

	* @return	Block size in bytes.

	*/

	virtual TInt BlockSize() const = 0;

	/**

	* Gets the key size in bits.	

	* 

	* @return	Key size in bits.

	*/

	virtual TInt KeySize() const = 0;

};

#endif	//	BLOCKTRANSFORMATION_H__