sl@0: /*
sl@0: * Copyright (c) 2006-2009 Nokia Corporation and/or its subsidiary(-ies).
sl@0: * All rights reserved.
sl@0: * This component and the accompanying materials are made available
sl@0: * under the terms of the License "Eclipse Public License v1.0"
sl@0: * which accompanies this distribution, and is available
sl@0: * at the URL "http://www.eclipse.org/legal/epl-v10.html".
sl@0: *
sl@0: * Initial Contributors:
sl@0: * Nokia Corporation - initial contribution.
sl@0: *
sl@0: * Contributors:
sl@0: *
sl@0: * Description: 
sl@0: *
sl@0: */
sl@0: 
sl@0: 
sl@0: #ifndef	__3DESIMPL_H__
sl@0: #define	__3DESIMPL_H__
sl@0: 
sl@0: /**
sl@0: @file 
sl@0: @internalComponent
sl@0: @released
sl@0: */
sl@0: 
sl@0: #include <e32base.h>
sl@0: #include <e32cmn.h>
sl@0: #include "keys.h"
sl@0: #include "desimpl.h"
sl@0: 
sl@0: /**
sl@0: Plug-in class for 3DES block cipher
sl@0: */
sl@0: namespace SoftwareCrypto
sl@0: 	{
sl@0: 	using namespace CryptoSpi;
sl@0: 	
sl@0: 	NONSHARABLE_CLASS(C3DesImpl) : public CDesImpl
sl@0: 		{
sl@0: 	public:
sl@0: 		/**
sl@0: 		Creates an instance of a 3DES (Data Encryption Standard) symmetric cipher plug-in.
sl@0: 		@param aKey The key
sl@0: 		@param aCryptoMode Whether to encrypt or decrypt
sl@0: 		@param aOperationMode The block cipher mode ECB, CBC, CTR etc
sl@0: 		@param aPadding The padding scheme to use None, SSLv3, PKCS#7
sl@0: 		@return A pointer to a C3DesImpl instance
sl@0: 		*/
sl@0: 		static C3DesImpl* NewL(const CKey& aKey, 
sl@0: 			TUid aCryptoMode, TUid aOperationMode, TUid aPadding);
sl@0: 
sl@0: 		/**
sl@0: 		Creates an instance of a 3DES (Data Encryption Standard) symmetric cipher plug-in.
sl@0: 		A pointer to the plug-in instance is placed on the cleanup stack.
sl@0: 		@param aKey The key
sl@0: 		@param aCryptoMode Whether to encrypt or decrypt
sl@0: 		@param aOperationMode The block cipher mode ECB, CBC, CTR etc
sl@0: 		@param aPadding The padding scheme to use None, SSLv3, PKCS#7
sl@0: 		@return A pointer to a C3DesImpl instance
sl@0: 		*/
sl@0: 		static C3DesImpl* NewLC(const CKey& aKey, 
sl@0: 			TUid aCryptoMode, TUid aOperationMode, TUid aPadding);
sl@0: 		
sl@0: 		// From CSymmetricCipherImpl
sl@0: 		TBool IsValidKeyLength(TInt aKeyBytes) const;
sl@0: 		TInt GetKeyStrength() const;
sl@0: 		TUid ImplementationUid() const;
sl@0: 		const CExtendedCharacteristics* GetExtendedCharacteristicsL();
sl@0: 		
sl@0: 		static CExtendedCharacteristics* CreateExtendedCharacteristicsL();
sl@0: 				
sl@0: 		/// 3Destructor
sl@0: 		~C3DesImpl();
sl@0: 
sl@0: 	private:
sl@0: 		/**
sl@0: 		Constructor
sl@0: 		@param aOperationMode The mode of operation e.g. CBC
sl@0: 		@param aCryptoMode Whether to encrypt or decrypt
sl@0: 		@param aPaddingMode The padding mode to use. None, SSL, PKCS#7
sl@0: 		*/
sl@0: 		C3DesImpl(TUid aOperationMode, TUid aCryptoMode, TUid aPaddingMode);
sl@0: 			
sl@0: 		///	second phase of construction	
sl@0: 		void ConstructL(const CKey& aKey);						
sl@0: 
sl@0: 		/**
sl@0: 		Creates the key schedules iK1, iK2, iK3 from CBlockTransformationImpl::iKey.
sl@0: 		This should be called from ConstructL and Reset
sl@0: 		*/
sl@0: 		void SetKeySchedule();
sl@0: 
sl@0: 		// From CSymmetricBlockCipherImpl
sl@0: 		void TransformEncrypt(TUint8* aBuffer, TUint aNumBlocks);
sl@0: 		void TransformDecrypt(TUint8* aBuffer, TUint aNumBlocks);
sl@0: 		
sl@0: 	private:
sl@0: 		/// Size of the key schedule in words
sl@0: 		static const TUint KKeyScheduleSize = 32;
sl@0: 		
sl@0: 		/// the key schedules
sl@0: 		TUint32 iK1[KKeyScheduleSize];
sl@0: 		TUint32 iK2[KKeyScheduleSize];
sl@0: 		TUint32 iK3[KKeyScheduleSize];
sl@0: 		
sl@0: 		static const TUint8 K3DesBlockBytes = 8;
sl@0: 		static const TUint8 K3DesKeyBytes = 24;
sl@0: 		};
sl@0: 	}
sl@0: 
sl@0: #endif // __3DESIMPL_H__