sl@0: /*
sl@0: * Copyright (c) 2006-2010 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	__DESEXTENDIMPL_H__
sl@0: #define	__DESEXTENDIMPL_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 <cryptospi/keys.h>
sl@0: #include "symmetriccipherimpl.h"
sl@0: 
sl@0: /**
sl@0: Plug-in class for DES block cipher (Including Extended Characterisitics for Test)
sl@0: */
sl@0: namespace SoftwareCrypto
sl@0: 	{
sl@0: 	using namespace CryptoSpi;
sl@0: 	
sl@0: 	NONSHARABLE_CLASS(CDesExtendImpl) : public CSymmetricBlockCipherImpl
sl@0: 		{
sl@0: 	public:
sl@0: 	
sl@0: 		/**
sl@0: 		Creates an instance of a DES (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 CDesImpl instance
sl@0: 		*/
sl@0: 		static CDesExtendImpl* NewL(TUid aImplementationUid, const CKey& aKey, 
sl@0: 			TUid aCryptoMode, TUid aOperationMode, TUid aPadding);
sl@0: 
sl@0: 		/**
sl@0: 		Creates an instance of a DES (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 T 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 CDesImpl instance
sl@0: 		*/
sl@0: 		static CDesExtendImpl* NewLC(TUid aImplementationUid, const CKey& aKey, 
sl@0: 			TUid aCryptoMode,	TUid aOperationMode, TUid aPadding);
sl@0: 		
sl@0: 		// From CSymmetricCipherImpl
sl@0: 		TInt GetKeyStrength() const;
sl@0: 		TBool IsValidKeyLength(TInt aKeyBytes) const;
sl@0: 		TUid ImplementationUid() const;
sl@0: 		const CExtendedCharacteristics* GetExtendedCharacteristicsL();
sl@0: 		
sl@0: 		static CExtendedCharacteristics* CreateExtendedCharacteristicsL();
sl@0: 
sl@0: 				
sl@0: 		/// Destructor
sl@0: 		~CDesExtendImpl();		
sl@0: 	protected:
sl@0: 		/**
sl@0: 		Constructor
sl@0: 		@param aBlockBytes The block size in bytes (needed to allow
sl@0: 		3DES implementation to inherit from this class)
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: 		CDesExtendImpl(TUid aImplementationUid, TUint8 aBlockBytes, TUid aOperationMode, TUid aCryptoMode, TUid aPaddingMode);
sl@0: 		
sl@0: 		/**	
sl@0: 		Second phase of construction
sl@0: 		@param aKey The key object
sl@0: 		*/
sl@0: 		void ConstructL(const CKey& aKey);	
sl@0: 			
sl@0: 		// These protected functions are re-used by 3DES
sl@0: 		/**
sl@0: 		Transforms a block of data
sl@0: 		@param l The left half of the block to transform
sl@0: 		@param r The right half of the block to transform
sl@0: 		@param aKeySchedule The keyschedule to use for the transformation
sl@0: 		*/
sl@0: 		void DoTransform(TUint32& l, TUint32& r, const TUint32* aKeySchedule);
sl@0: 		
sl@0: 		/**
sl@0: 		Setup the key schedule for encryption
sl@0: 		@param aKey The input key
sl@0: 		@param aKeySchedule A pointer to the key schedule buffer
sl@0: 		*/
sl@0: 		void SetEncryptKeySchedule(const TDesC8& aKey, TUint32* aKeySchedule);
sl@0: 		
sl@0: 		/**
sl@0: 		Setup the key schedule for decryption
sl@0: 		@param aKey The input key
sl@0: 		@param aKeySchedule A pointer to the key schedule buffer		
sl@0: 		*/
sl@0: 		void SetDecryptKeySchedule(const TDesC8& aKey, TUint32* aKeySchedule);
sl@0: 		
sl@0: 		static const TUint8 KDesBlockBytes = 8;
sl@0: 		static const TUint8 KDesKeyBytes = 8;						
sl@0: 
sl@0: 	private:														
sl@0: 
sl@0: 		/**
sl@0: 		Creates the key schedule iK 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: 		
sl@0: 		TUid iImplementationUid; 
sl@0: 		
sl@0: 		CExtendedCharacteristics* iExtendChars; 
sl@0: 	
sl@0: 		/// Size of the key schedule in words
sl@0: 		static const TUint KKeyScheduleSize = 32;
sl@0: 		
sl@0: 		/// the key schedule
sl@0: 		TUint32 iK[KKeyScheduleSize];
sl@0: 		};
sl@0: 	}
sl@0: 
sl@0: #endif // __DESEXTENDIMPL_H__