/*+
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* Copyright (c) 2006-2009 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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*+
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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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/**+
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@file +
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@internalComponent+
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@released+
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*/+
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+
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#include <e32base.h>+
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#include <e32cmn.h>+
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#include "keys.h"+
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#include "desimpl.h"+
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+
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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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		/**+
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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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		/**+
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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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		+
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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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				+
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		/// 3Destructor+
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		~C3DesImpl();+
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+
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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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			+
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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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		/**+
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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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+
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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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		+
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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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		+
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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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		+
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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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+
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#endif // __3DESIMPL_H__+
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