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/*
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* Copyright (c) 2006-2010 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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*
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*/
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#ifndef __3DESIMPL_H__
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#define __3DESIMPL_H__
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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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#include <e32base.h>
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#include <e32cmn.h>
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#include <cryptospi/keys.h>
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#include "desimpl.h"
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/**
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Plug-in class for 3DES block cipher
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*/
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namespace SoftwareCrypto
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{
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NONSHARABLE_CLASS(C3DesImpl) : public CDesImpl
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{
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public:
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/**
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Creates an instance of a 3DES (Data Encryption Standard) symmetric cipher plug-in.
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@param aKey The key
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@param aCryptoMode Whether to encrypt or decrypt
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@param aOperationMode The block cipher mode ECB, CBC, CTR etc
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@param aPadding The padding scheme to use None, SSLv3, PKCS#7
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@return A pointer to a C3DesImpl instance
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*/
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static C3DesImpl* NewL(const CryptoSpi::CKey& aKey,
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TUid aCryptoMode, TUid aOperationMode, TUid aPadding);
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/**
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Creates an instance of a 3DES (Data Encryption Standard) symmetric cipher plug-in.
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A pointer to the plug-in instance is placed on the cleanup stack.
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@param aKey The key
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@param aCryptoMode Whether to encrypt or decrypt
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@param aOperationMode The block cipher mode ECB, CBC, CTR etc
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@param aPadding The padding scheme to use None, SSLv3, PKCS#7
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@return A pointer to a C3DesImpl instance
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*/
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static C3DesImpl* NewLC(const CryptoSpi::CKey& aKey,
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TUid aCryptoMode, TUid aOperationMode, TUid aPadding);
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// From CSymmetricCipherImpl
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TBool IsValidKeyLength(TInt aKeyBytes) const;
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TInt GetKeyStrength() const;
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TUid ImplementationUid() const;
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/// 3Destructor
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~C3DesImpl();
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private:
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/**
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Constructor
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@param aOperationMode The mode of operation e.g. CBC
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@param aCryptoMode Whether to encrypt or decrypt
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@param aPaddingMode The padding mode to use. None, SSL, PKCS#7
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*/
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C3DesImpl(TUid aOperationMode, TUid aCryptoMode, TUid aPaddingMode);
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/// second phase of construction
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void ConstructL(const CryptoSpi::CKey& aKey);
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/**
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Creates the key schedules iK1, iK2, iK3 from CBlockTransformationImpl::iKey.
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This should be called from ConstructL and Reset
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*/
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void SetKeySchedule();
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// From CSymmetricBlockCipherImpl
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void TransformEncrypt(TUint8* aBuffer, TUint aNumBlocks);
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void TransformDecrypt(TUint8* aBuffer, TUint aNumBlocks);
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private:
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/// Size of the key schedule in words
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static const TUint KKeyScheduleSize = 32;
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/// the key schedules
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TUint32 iK1[KKeyScheduleSize];
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TUint32 iK2[KKeyScheduleSize];
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TUint32 iK3[KKeyScheduleSize];
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static const TUint8 K3DesBlockBytes = 8;
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static const TUint8 K3DesKeyBytes = 24;
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};
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}
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#endif // __3DESIMPL_H__
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