--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/cryptoplugins/cryptospiplugins/source/softwarecrypto/rc2impl.cpp	Fri Nov 06 13:21:00 2009 +0200
@@ -0,0 +1,213 @@
+/*
+* 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: 
+*
+*/
+
+
+#include "rc2impl.h"
+#include "keys.h"
+
+#include "rc2table.h"
+#include "common/inlines.h"
+#include "pluginconfig.h"
+#include "symmetriccipherimpl.h"
+#include <cryptostrength.h>
+
+using namespace SoftwareCrypto;
+
+CRc2Impl::CRc2Impl(
+	TUid aCryptoMode,
+	TUid aOperationMode,
+	TUid aPadding) :
+	CSymmetricBlockCipherImpl(KRc2BlockBytes, aCryptoMode, aOperationMode, aPadding)
+	{
+	}
+
+CRc2Impl* CRc2Impl::NewL(
+	const CKey& aKey,
+	TUid aCryptoMode,
+	TUid aOperationMode,
+	TUid aPadding,
+	TInt aEffectiveKeyLenBits)	
+	{
+	CRc2Impl* self = CRc2Impl::NewLC(aKey, aCryptoMode, aOperationMode, aPadding, aEffectiveKeyLenBits);
+	CleanupStack::Pop(self);
+	return self;
+	}
+	
+CRc2Impl* CRc2Impl::NewLC(
+	const CKey& aKey,
+	TUid aCryptoMode,
+	TUid aOperationMode,
+	TUid aPadding,
+	TInt aEffectiveKeyLenBits)
+	{
+	CRc2Impl* self = new(ELeave) CRc2Impl(aCryptoMode, aOperationMode, aPadding);
+	CleanupStack::PushL(self);
+	self->ConstructL(aKey, aEffectiveKeyLenBits);
+	
+	const TDesC8& keyContent = aKey.GetTDesC8L(KSymmetricKeyParameterUid);
+	TCrypto::IsSymmetricWeakEnoughL(BytesToBits(keyContent.Size()) - keyContent.Size());
+	return self;
+	}
+		
+CRc2Impl::~CRc2Impl()
+	{
+	Mem::FillZ(&iK, sizeof(iK));
+	}
+	
+void CRc2Impl::ConstructL(const CKey& aKey, TInt aEffectiveKeyLenBits)	
+	{
+	iEffectiveKeyLenBits = aEffectiveKeyLenBits;	
+	CSymmetricBlockCipherImpl::ConstructL(aKey);
+	SetKeySchedule();
+	}
+	
+CExtendedCharacteristics* CRc2Impl::CreateExtendedCharacteristicsL()
+	{
+	// All Symbian software plug-ins have unlimited concurrency, cannot be reserved
+	// for exclusive use and are not CERTIFIED to be standards compliant.
+	return CExtendedCharacteristics::NewL(KMaxTInt, EFalse);
+	}
+
+const CExtendedCharacteristics* CRc2Impl::GetExtendedCharacteristicsL()
+	{
+	return CRc2Impl::CreateExtendedCharacteristicsL();
+	}
+
+TUid CRc2Impl::ImplementationUid() const
+	{
+	return KCryptoPluginRc2Uid;
+	}
+
+TBool CRc2Impl::IsValidKeyLength(TInt aKeyBytes) const
+	{
+	return ((aKeyBytes > 0 && aKeyBytes <= KRc2MaxKeySizeBytes) ? ETrue : EFalse);
+	}	
+	
+TInt CRc2Impl::GetKeyStrength() const
+	{
+	return Min(iEffectiveKeyLenBits, BytesToBits(iKeyBytes));
+	}
+
+void CRc2Impl::SetKeySchedule()
+	{				
+	TUint keyLen = iKey->Length();
+	
+	TUint8 L[KRc2MaxKeySizeBytes];	
+	Mem::Copy((TUint8*)&L[0], (TUint8*)&(*iKey)[0], keyLen);
+
+	TInt i = keyLen;
+	for (; i < KRc2MaxKeySizeBytes; i++)
+		{
+		L[i] = RC2_TABLE::PITABLE[(L[i-1] + L[i-keyLen]) & 255];
+		}
+
+	TUint T8 = (iEffectiveKeyLenBits+7) / 8;
+	TUint8 TM = (TUint8)(255 >> ((8-(iEffectiveKeyLenBits%8))%8));
+	L[128-T8] = RC2_TABLE::PITABLE[L[128-T8] & TM];
+
+	for (i=127-T8; i>=0; i--)
+		L[i] = RC2_TABLE::PITABLE[L[i+1] ^ L[i+T8]];
+
+	for (i=0; i < KRc2ExpandedKeyLen; i++)
+		iK[i] = (TUint16)(L[2*i] + (L[2*i+1] << 8));
+	}
+
+#pragma warning (disable : 4244)	//	conversion from 'int' to 'unsigned short', possible loss of data
+void CRc2Impl::TransformEncrypt(
+	TUint8* aBuffer,
+	TUint aNumBlocks)
+	{
+	for (TInt blockNum = 0; blockNum < aNumBlocks; ++blockNum)
+		{		
+		ModeEncryptStart(aBuffer);
+		
+		TUint16 R0, R1, R2, R3;
+		GetBlockLittleEndian(aBuffer, R0, R1, R2, R3);
+		
+		TInt i = 0;
+		for (; i < 16; i++)
+			{
+			R0 += (R1 & ~R3) + (R2 & R3) + iK[4*i+0];
+			R0 = rotlFixed(R0, 1);
+
+			R1 += (R2 & ~R0) + (R3 & R0) + iK[4*i+1];
+			R1 = rotlFixed(R1, 2);
+
+			R2 += (R3 & ~R1) + (R0 & R1) + iK[4*i+2];
+			R2 = rotlFixed(R2, 3);
+
+			R3 += (R0 & ~R2) + (R1 & R2) + iK[4*i+3];
+			R3 = rotlFixed(R3, 5);
+
+			if (i == 4 || i == 10)
+				{
+				R0 += iK[R3 & 63];
+				R1 += iK[R0 & 63];
+				R2 += iK[R1 & 63];
+				R3 += iK[R2 & 63];
+				}
+			}
+		PutBlockLittleEndian(aBuffer, R0, R1, R2, R3);	
+		ModeEncryptEnd(aBuffer);
+		aBuffer += KRc2BlockBytes;
+		}
+	}
+#pragma warning (default : 4244)	//	conversion from 'int' to 'unsigned short', possible loss of data
+
+
+#pragma warning (disable : 4244)	//	conversion from 'int' to 'unsigned short', possible loss of data
+void CRc2Impl::TransformDecrypt(
+	TUint8* aBuffer,
+	TUint aNumBlocks)
+	{
+	for (TInt blockNum = 0; blockNum < aNumBlocks; ++blockNum)
+		{		
+		ModeDecryptStart(aBuffer);
+
+		TUint16 R0, R1, R2, R3;
+		GetBlockLittleEndian(aBuffer, R0, R1, R2, R3);
+
+		TInt i = 15;
+		for (; i >= 0; i--)
+			{
+			if (i == 4 || i == 10)
+				{
+				R3 -= iK[R2 & 63];
+				R2 -= iK[R1 & 63];
+				R1 -= iK[R0 & 63];
+				R0 -= iK[R3 & 63];
+				}
+
+			R3 = rotrFixed(R3, 5);
+			R3 -= (R0 & ~R2) + (R1 & R2) + iK[4*i+3];
+
+			R2 = rotrFixed(R2, 3);
+			R2 -= (R3 & ~R1) + (R0 & R1) + iK[4*i+2];
+
+			R1 = rotrFixed(R1, 2);
+			R1 -= (R2 & ~R0) + (R3 & R0) + iK[4*i+1];
+
+			R0 = rotrFixed(R0, 1);
+			R0 -= (R1 & ~R3) + (R2 & R3) + iK[4*i+0];
+			}
+
+		PutBlockLittleEndian(aBuffer, R0, R1, R2, R3);
+		ModeDecryptEnd(aBuffer);
+		aBuffer += KRc2BlockBytes;
+		}
+	}
+#pragma warning (default : 4244)	//	conversion from 'int' to 'unsigned short', possible loss of data