1 /*

     2 * Copyright (c) 2002-2009 Nokia Corporation and/or its subsidiary(-ies).

     3 * All rights reserved.

     4 * This component and the accompanying materials are made available

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

     6 * which accompanies this distribution, and is available

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

     8 *

     9 * Initial Contributors:

    10 * Nokia Corporation - initial contribution.

    11 *

    12 * Contributors:

    13 *

    14 * Description: 

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

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

    17 * CBlockTransformation class implementation

    18 *

    19 */

    20 

    21 

    22 

    23 

    24 /**

    25  @file 

    26  @internalAll

    27 */

    28  

    29 #ifndef	__BLOCKTRANSFORMATION_H__

    30 #define	__BLOCKTRANSFORMATION_H__

    31 

    32 #include <e32base.h>

    33 

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

    35 const TUint KMaxBlockSizeSupported = 32;

    36 

    37 /**

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

    39 *

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

    41 * block of output the same size.  

    42 *

    43 * @publishedPartner

    44 * @released

    45 */

    46 class CBlockTransformation : public CBase

    47 {

    48 public:

    49 	/**

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

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

    52 	*

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

    54 	*				on return, the data after transformation.

    55 	*/

    56 	virtual void Transform(TDes8& aBlock) = 0;

    57 	

    58 	/**

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

    60 	*/	

    61 	virtual void Reset() = 0;

    62 	

    63 	/**

    64 	* Gets the block size in bytes.

    65 	*

    66 	* @return	Block size in bytes.

    67 	*/

    68 	virtual TInt BlockSize() const = 0;

    69 	

    70 	/**

    71 	* Gets the key size in bits.	

    72 	* 

    73 	* @return	Key size in bits.

    74 	*/

    75 	virtual TInt KeySize() const = 0;

    76 };

    77 

    78 #endif	//	__BLOCKTRANSFORMATION_H__