--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/crypto/weakcrypto/source/symmetric/arc4.cpp	Thu Jun 24 15:39:07 2010 +0530
@@ -0,0 +1,124 @@
+/*
+* Copyright (c) 2002-2009 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: 
+*
+*/
+
+
+#include "arc4.h"
+#include "../common/inlines.h"
+#include <e32base.h>
+#include <cryptostrength.h>
+
+#ifdef SYMBIAN_ENABLE_SPLIT_HEADERS
+/** The size of the substitution box (i.e. lookup table) in bytes. */
+const TInt KSBoxSize = 256;
+#endif
+
+inline TUint8 CARC4::GenerateByte()
+	{
+	TUint8 a = iState[ix];
+	iy = (TUint8)((iy + a) & 0xff);
+	TUint8 b = iState[iy];
+
+	iState[ix] = b;
+	iState[iy] = a;
+	ix = (TUint8)((ix + 1) & 0xff);
+	return (iState[(a + b) & 0xff]);
+	}
+
+CARC4::CARC4(const TDesC8& aKey, TUint aDiscardBytes)
+	: ix(1), iy(0), iDiscardBytes(aDiscardBytes)
+	{
+	iKey.Copy(aKey);
+	GenerateSBox();
+	}
+
+EXPORT_C CARC4* CARC4::NewL(const TDesC8& aKey, TUint aDiscardBytes)
+	{
+	CARC4* self = NewLC(aKey, aDiscardBytes);
+	CleanupStack::Pop(self);
+	return self;
+	}
+
+EXPORT_C CARC4* CARC4::NewLC(const TDesC8& aKey, TUint aDiscardBytes)
+	{
+	CARC4* self = new(ELeave)CARC4(aKey, aDiscardBytes);
+	CleanupStack::PushL(self);
+	TCrypto::IsSymmetricWeakEnoughL(BytesToBits(aKey.Size()));
+	return self;
+	}
+
+void CARC4::DoProcess(TDes8& aData)
+	{
+	TInt blockLen = aData.Size();
+
+	if (blockLen > 0)
+		{
+		TUint8* blockPtr = (TUint8*)&aData[0];	
+		do
+			{
+			*blockPtr++ ^= GenerateByte();
+			} 
+		while (--blockLen);
+		}
+	}
+
+void CARC4::Reset()
+	{
+	ix = 1;
+	iy = 0;
+	GenerateSBox();
+	}
+
+TInt CARC4::KeySize() const
+	{
+	return (iKey.Size());
+	}
+
+void CARC4::DiscardBytes(TInt aDiscardBytes)
+	{	
+	if (aDiscardBytes > 0)
+		{
+		do
+			{
+			GenerateByte();
+			}
+		while(--aDiscardBytes);
+		}
+	}
+
+void CARC4::GenerateSBox(void)
+	{
+	TUint keyBytes = iKey.Size();
+		
+	TInt i = 0;
+	for (; i < KSBoxSize; i++)
+		iState[i] = (TUint8)i;
+	
+	TUint keyIndex = 0, stateIndex = 0;
+	i = 0;
+	for (; i < KSBoxSize; i++)
+		{
+		TUint a = iState[i];
+		stateIndex += iKey[keyIndex] + a;
+		stateIndex &= 0xff;
+		iState[i] = iState[stateIndex];
+		iState[stateIndex] = (TUint8)a;
+		if (++keyIndex >= (TUint)keyBytes)
+			keyIndex = 0;
+		}
+
+	DiscardBytes(iDiscardBytes);
+	}