--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/cryptoplugins/cryptospiplugins/source/softwarecrypto/arc4impl.h	Fri Nov 06 13:21:00 2009 +0200
@@ -0,0 +1,117 @@
+/*
+* Copyright (c) 2006-2009 Nokia Corporation and/or its subsidiary(-ies).
+* All rights reserved.
+* This component and the accompanying materials are made available
+* under the terms of the License "Eclipse Public License v1.0"
+* which accompanies this distribution, and is available
+* at the URL "http://www.eclipse.org/legal/epl-v10.html".
+*
+* Initial Contributors:
+* Nokia Corporation - initial contribution.
+*
+* Contributors:
+*
+* Description: 
+*
+*/
+
+
+#ifndef	ARC4IMPL_H
+#define	ARC4IMPL_H
+
+/**
+@file 
+@internalComponent
+@released
+*/
+
+#include "symmetriccipherimpl.h"
+#include <e32base.h>
+#include <e32cmn.h>
+#include "keys.h"
+
+
+/**
+Plug-in class for ARC4 stream cipher
+*/
+namespace SoftwareCrypto
+	{
+	using namespace CryptoSpi;
+
+	NONSHARABLE_CLASS(CArc4Impl) : public CSymmetricStreamCipherImpl
+		{
+	public:
+		
+		/** 
+		Number of bytes to discard by default from an ARC4 key stream. 
+		*/
+		static const TUint KDefaultDiscardBytes = 768;
+
+		/** 
+		The size of the substitution box (i.e. lookup table) in bytes. 
+		*/
+		static const TInt KSBoxSize = 256;
+
+		/** 
+		Maximum ARC4 key size in bytes.2048 bits 
+		*/
+		static const TInt KMaxARC4KeyBytes = 256; 
+
+		/**
+		Creates an instance of an ARC4 symmetric cipher plug-in.
+		@param aKey The key
+		@param aDiscardBytes The number of bytes to drop from 
+							the beginning of the key stream.
+		@return A pointer to a CArc4Impl instance
+		*/
+		static CArc4Impl* NewL(const CKey& aKey, TInt aDiscardBytes);
+
+		/**
+		Creates an instance of an ARC4 symmetric cipher plug-in,
+		and leave it on the cleanup stack
+		@param aKey The key
+		@param aDiscardBytes The number of bytes to drop from 
+							the beginning of the key stream.
+		@return A pointer to a CArc4Impl instance
+		*/
+		static CArc4Impl* NewLC(const CKey& aKey, TInt aDiscardBytes);
+
+		//Destructor
+		~CArc4Impl();
+
+		//Override MPlugin virtual function
+		void Reset();
+		
+		//Override CSymmetricCipherImpl virtual functions
+		TUid ImplementationUid() const;
+		TBool IsValidKeyLength(TInt aKeyBytes) const;
+		const CExtendedCharacteristics* GetExtendedCharacteristicsL();
+		
+		static CExtendedCharacteristics* CreateExtendedCharacteristicsL();
+		
+	private:
+		//Constructor
+		CArc4Impl(TInt aDiscardBytes);
+			
+		//second phase of construction	
+		void ConstructL(const CKey& aKey);
+				
+		//Override CSymmetricStreamCipherImpl virtual functions
+		void DoProcess(TDes8& aData);	
+
+		void GenerateSBox();
+		TUint8 GenerateByte();
+		void DiscardBytes(TInt aDiscardBytes);
+
+	private:
+		TUint8 ix;
+		TUint8 iy;
+		TInt iDiscardBytes;
+		TUint8 iState[KSBoxSize];
+		};
+	}
+
+#endif //ARC4IMPL_H
+
+
+