1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/os/security/cryptoplugins/cryptospiplugins/source/softwarecrypto/arc4impl.h	Fri Jun 15 03:10:57 2012 +0200
     1.3 @@ -0,0 +1,117 @@
     1.4 +/*
     1.5 +* Copyright (c) 2006-2009 Nokia Corporation and/or its subsidiary(-ies).
     1.6 +* All rights reserved.
     1.7 +* This component and the accompanying materials are made available
     1.8 +* under the terms of the License "Eclipse Public License v1.0"
     1.9 +* which accompanies this distribution, and is available
    1.10 +* at the URL "http://www.eclipse.org/legal/epl-v10.html".
    1.11 +*
    1.12 +* Initial Contributors:
    1.13 +* Nokia Corporation - initial contribution.
    1.14 +*
    1.15 +* Contributors:
    1.16 +*
    1.17 +* Description: 
    1.18 +*
    1.19 +*/
    1.20 +
    1.21 +
    1.22 +#ifndef	ARC4IMPL_H
    1.23 +#define	ARC4IMPL_H
    1.24 +
    1.25 +/**
    1.26 +@file 
    1.27 +@internalComponent
    1.28 +@released
    1.29 +*/
    1.30 +
    1.31 +#include "symmetriccipherimpl.h"
    1.32 +#include <e32base.h>
    1.33 +#include <e32cmn.h>
    1.34 +#include "keys.h"
    1.35 +
    1.36 +
    1.37 +/**
    1.38 +Plug-in class for ARC4 stream cipher
    1.39 +*/
    1.40 +namespace SoftwareCrypto
    1.41 +	{
    1.42 +	using namespace CryptoSpi;
    1.43 +
    1.44 +	NONSHARABLE_CLASS(CArc4Impl) : public CSymmetricStreamCipherImpl
    1.45 +		{
    1.46 +	public:
    1.47 +		
    1.48 +		/** 
    1.49 +		Number of bytes to discard by default from an ARC4 key stream. 
    1.50 +		*/
    1.51 +		static const TUint KDefaultDiscardBytes = 768;
    1.52 +
    1.53 +		/** 
    1.54 +		The size of the substitution box (i.e. lookup table) in bytes. 
    1.55 +		*/
    1.56 +		static const TInt KSBoxSize = 256;
    1.57 +
    1.58 +		/** 
    1.59 +		Maximum ARC4 key size in bytes.2048 bits 
    1.60 +		*/
    1.61 +		static const TInt KMaxARC4KeyBytes = 256; 
    1.62 +
    1.63 +		/**
    1.64 +		Creates an instance of an ARC4 symmetric cipher plug-in.
    1.65 +		@param aKey The key
    1.66 +		@param aDiscardBytes The number of bytes to drop from 
    1.67 +							the beginning of the key stream.
    1.68 +		@return A pointer to a CArc4Impl instance
    1.69 +		*/
    1.70 +		static CArc4Impl* NewL(const CKey& aKey, TInt aDiscardBytes);
    1.71 +
    1.72 +		/**
    1.73 +		Creates an instance of an ARC4 symmetric cipher plug-in,
    1.74 +		and leave it on the cleanup stack
    1.75 +		@param aKey The key
    1.76 +		@param aDiscardBytes The number of bytes to drop from 
    1.77 +							the beginning of the key stream.
    1.78 +		@return A pointer to a CArc4Impl instance
    1.79 +		*/
    1.80 +		static CArc4Impl* NewLC(const CKey& aKey, TInt aDiscardBytes);
    1.81 +
    1.82 +		//Destructor
    1.83 +		~CArc4Impl();
    1.84 +
    1.85 +		//Override MPlugin virtual function
    1.86 +		void Reset();
    1.87 +		
    1.88 +		//Override CSymmetricCipherImpl virtual functions
    1.89 +		TUid ImplementationUid() const;
    1.90 +		TBool IsValidKeyLength(TInt aKeyBytes) const;
    1.91 +		const CExtendedCharacteristics* GetExtendedCharacteristicsL();
    1.92 +		
    1.93 +		static CExtendedCharacteristics* CreateExtendedCharacteristicsL();
    1.94 +		
    1.95 +	private:
    1.96 +		//Constructor
    1.97 +		CArc4Impl(TInt aDiscardBytes);
    1.98 +			
    1.99 +		//second phase of construction	
   1.100 +		void ConstructL(const CKey& aKey);
   1.101 +				
   1.102 +		//Override CSymmetricStreamCipherImpl virtual functions
   1.103 +		void DoProcess(TDes8& aData);	
   1.104 +
   1.105 +		void GenerateSBox();
   1.106 +		TUint8 GenerateByte();
   1.107 +		void DiscardBytes(TInt aDiscardBytes);
   1.108 +
   1.109 +	private:
   1.110 +		TUint8 ix;
   1.111 +		TUint8 iy;
   1.112 +		TInt iDiscardBytes;
   1.113 +		TUint8 iState[KSBoxSize];
   1.114 +		};
   1.115 +	}
   1.116 +
   1.117 +#endif //ARC4IMPL_H
   1.118 +
   1.119 +
   1.120 +