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/*
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* Copyright (c) 2002-2009 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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* ** IMPORTANT ** PublishedPartner API's in this file are published to 3rd party developers via the
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* Symbian website. Changes to these API's should be treated as PublishedAll API changes and the Security TA should be consulted.
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*
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*/
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/**
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@file
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@publishedPartner
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@released
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*/
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#ifndef __MODE_H__
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#define __MODE_H__
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#include "blocktransformation.h"
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/**
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* Abstract class defining the use of block transformation objects as block
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* chaining modes.
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*
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* It is initialised with a subclass of CBlockTransformation,
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* which it subsequently owns. Calls to its Transform() function will call the
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* Transform() function in the underlying CBlockTransformation object, and perform
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* the additional transformation for block chaining in that mode. This all means
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* that if you want to do, say, AES encryption in CBC mode, you need to construct
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* a CAESEncryptor object, then pass it to the CModeCBCEncryptor subclass of
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* CBlockChainingMode, and subsequently use the CModeCBCEncryptor object to call
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* Transform().
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*
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* @publishedPartner
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* @released
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*/
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class CBlockChainingMode : public CBlockTransformation
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{
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public:
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virtual void Reset();
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virtual TInt BlockSize() const;
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virtual TInt KeySize() const;
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public:
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/**
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* Sets the initialization vector.
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*
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* @param aIV The initialization vector. The length of this descriptor must be
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* the same as the underlying cipher's block size.
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*/
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virtual void SetIV(const TDesC8& aIV);
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protected:
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/** Default constructor */
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IMPORT_C CBlockChainingMode();
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/**
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* Second phase constructor
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*
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* This should be called last by derived classes' ContructL()s .
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*
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* @param aBT A block transformation object
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* @param aIV Initialization vector, the length of this descriptor must be
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* the same as the underlying cipher's block size.
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*/
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IMPORT_C void ConstructL(CBlockTransformation* aBT, const TDesC8& aIV);
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/** The destructor frees all resources owned by the object, prior to its destruction. */
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IMPORT_C virtual ~CBlockChainingMode();
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protected:
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/** A block transformation object */
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CBlockTransformation* iBT;
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/**
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* A buffer containing the feedback register
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*
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* This must equal the underlying cipher's block size in length.
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* Initially this register is filled with the initialization vector.
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*/
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HBufC8* iRegisterBuf;
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/** Encapsulates a pointer to iRegisterBuf */
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TPtr8 iRegister;
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/**
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* A buffer containing the Initialisation Vector (IV)
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*
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* This must equal the underlying cipher's block size in length.
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*/
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HBufC8* iIVBuf;
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/** Encapsulates a pointer to iIVBuf */
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TPtr8 iIV;
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};
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#endif // __MODE_H__
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