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	__RC2_H__
sl@0: #define	__RC2_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 "symmetriccipherimpl.h"
sl@0: 
sl@0: /**
sl@0: Plug-in class for RC2 block cipher
sl@0: */
sl@0: namespace SoftwareCrypto
sl@0: 	{
sl@0: 	using namespace CryptoSpi;
sl@0: 	
sl@0: 	NONSHARABLE_CLASS(CRc2Impl) : public CSymmetricBlockCipherImpl
sl@0: 		{
sl@0: 	public:
sl@0: 		/**
sl@0: 		Creates an instance of an RC2 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: 		@param aEffectiveKeyLenBits The effective key length in bits
sl@0: 		@return A pointer to a CRc2Impl instance
sl@0: 		*/
sl@0: 		static CRc2Impl* NewL(const CKey& aKey, 
sl@0: 			TUid aCryptoMode, TUid aOperationMode, TUid aPadding, TInt aEffectiveKeyLenBits);
sl@0: 
sl@0: 		/**
sl@0: 		Creates an instance of an RC2 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: 		@param aEffectiveKeyLenBits The effective key length in bits
sl@0: 		@return A pointer to a CRc2Impl instance
sl@0: 		*/
sl@0: 		static CRc2Impl* NewLC(const CKey& aKey, 
sl@0: 			TUid aCryptoMode, TUid aOperationMode, TUid aPadding, TInt aEffectiveKeyLenBits);
sl@0: 		
sl@0: 		// From CSymmetricCipherImpl
sl@0: 		TBool IsValidKeyLength(TInt aKeyBytes) const;
sl@0: 		TUid ImplementationUid() const;
sl@0: 		TInt GetKeyStrength() const;
sl@0: 		const CExtendedCharacteristics* GetExtendedCharacteristicsL();
sl@0: 		
sl@0: 		static CExtendedCharacteristics* CreateExtendedCharacteristicsL();
sl@0: 				
sl@0: 		/// Destructor
sl@0: 		~CRc2Impl();
sl@0: 		
sl@0: 		/** SSL Effective Key Length Compatibility - for compatibility with SSL */
sl@0: 		static const TUint KDefaultEffectiveKeyLenBits = 1024;
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: 		CRc2Impl(TUid aOperationMode, TUid aCryptoMode, TUid aPaddingMode);
sl@0: 			
sl@0: 		///	second phase of construction	
sl@0: 		void ConstructL(const CKey& aKey, TInt aEffectiveKeyLenBits);
sl@0: 					
sl@0: 		/**
sl@0: 		Expands the key (iKey) to iEffectiveKeyLenBits and stores the result in iK
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: 		static const TUint8 KRc2BlockBytes = 8;
sl@0: 		static const TInt KRc2MaxKeySizeBytes = 128;	
sl@0: 		static const TInt KRc2ExpandedKeyLen = 64;
sl@0: 		/**
sl@0: 	 	 The expanded key buffer.
sl@0: 		 Each iK[i] is a 16-bit word.
sl@0: 	 	 */
sl@0: 		TUint16 iK[KRc2ExpandedKeyLen];	//	128 bytes		
sl@0: 		
sl@0: 		/** The effective key length in bits */
sl@0: 		TInt iEffectiveKeyLenBits;	
sl@0: 		};
sl@0: 	}
sl@0: 
sl@0: #endif //__RC2_H__