--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/crypto/weakcrypto/source/symmetric/rc2.cpp	Wed Jul 08 11:25:26 2009 +0100
@@ -0,0 +1,199 @@
+/*
+* 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 "rc2.h"
+#include "rc2table.h"
+#include "../common/inlines.h"
+#include <cryptostrength.h>
+
+const TInt KRC2BlockBytes = 8;
+
+/* CRC2Encryptor */
+
+void CRC2::SetKey(const TDesC8& aKey, TInt aEffectiveKeyLenBits)
+	{
+	TUint keyLen = (TUint)aKey.Size();
+
+	iKey.Copy(aKey);
+	iEffectiveKeyLenBits = aEffectiveKeyLenBits;
+
+	TUint8 L[KRC2MaxKeySizeBytes];	
+	Mem::Copy((TUint8*)&L[0], (TUint8*)&aKey[0], keyLen);
+
+	TInt maxKeySizeBytes = (TInt)KRC2MaxKeySizeBytes;
+	TInt expandedKeyLen = (TInt)KRC2ExpandedKeyLen;
+	TInt i = keyLen;
+	for (; i < maxKeySizeBytes; i++)
+		{
+		L[i] = RC2_TABLE::PITABLE[(L[i-1] + L[i-keyLen]) & 255];
+		}
+
+	TUint T8 = (aEffectiveKeyLenBits+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 < expandedKeyLen; i++)
+		iK[i] = (TUint16)(L[2*i] + (L[2*i+1] << 8));
+	}
+
+void CRC2::Reset()
+	{
+	SetKey(iKey, iEffectiveKeyLenBits);
+	}
+
+TInt CRC2::BlockSize() const
+	{
+	return KRC2BlockBytes;
+	}
+
+TInt CRC2::KeySize() const
+	{
+	return iKey.Size();
+	}
+
+CRC2::CRC2(void)
+	{
+	}
+
+/* CRC2Encryptor */
+
+EXPORT_C CRC2Encryptor* CRC2Encryptor::NewL(const TDesC8& aKey, 
+	TInt aEffectiveKeyLenBits)
+	{
+	CRC2Encryptor* me = CRC2Encryptor::NewLC(aKey, aEffectiveKeyLenBits);
+	CleanupStack::Pop(me);
+	return (me);
+	}
+
+EXPORT_C CRC2Encryptor* CRC2Encryptor::NewLC(const TDesC8& aKey, 
+	TInt aEffectiveKeyLenBits)
+	{
+	CRC2Encryptor* me = new (ELeave) CRC2Encryptor;
+	CleanupStack::PushL(me);	//	Does not leave but function requires it be Push-ed
+	me->SetKey(aKey, aEffectiveKeyLenBits);	
+	// weak enough if either aKey or aEffectiveKeyLenBits is weak
+	TInt minKeySize = Min(aEffectiveKeyLenBits, BytesToBits(aKey.Size()));
+	TCrypto::IsSymmetricWeakEnoughL(minKeySize);
+	return (me);
+	}
+
+#pragma warning (disable : 4244)	//	conversion from 'int' to 'unsigned short', possible loss of data
+void CRC2Encryptor::Transform(TDes8& aBlock)
+	{
+	assert(aBlock.Size() == KRC2BlockBytes);
+	
+	TUint16 R0, R1, R2, R3;
+	GetBlockLittleEndian((TUint8*)&aBlock[0], 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((TUint8*)&aBlock[0], R0, R1, R2, R3);	
+	}
+#pragma warning (default : 4244)	//	conversion from 'int' to 'unsigned short', possible loss of data
+
+CRC2Encryptor::CRC2Encryptor(void)
+	{
+	}
+
+/* CRC2Decryptor */
+
+EXPORT_C CRC2Decryptor* CRC2Decryptor::NewL(const TDesC8& aKey, 
+	TInt aEffectiveKeyLenBits)
+	{
+	CRC2Decryptor* me = CRC2Decryptor::NewLC(aKey, aEffectiveKeyLenBits);
+	CleanupStack::Pop(me);
+	return (me);
+	}
+
+EXPORT_C CRC2Decryptor* CRC2Decryptor::NewLC(const TDesC8& aKey, 
+	TInt aEffectiveKeyLenBits)
+	{
+	CRC2Decryptor* me = new (ELeave) CRC2Decryptor;
+	CleanupStack::PushL(me);	//	Does not leave but function requires it be Push-ed
+	me->SetKey(aKey, aEffectiveKeyLenBits);
+	// weak enough if either aKey or aEffectiveKeyLenBits is weak
+	TInt minKeySize = Min(aEffectiveKeyLenBits, BytesToBits(aKey.Size()));
+	TCrypto::IsSymmetricWeakEnoughL(minKeySize);
+	return (me);
+	}
+
+#pragma warning (disable : 4244)	//	conversion from 'int' to 'unsigned short', possible loss of data
+void CRC2Decryptor::Transform(TDes8& aBlock)
+	{
+	assert(aBlock.Size() == KRC2BlockBytes);
+
+	TUint16 R0, R1, R2, R3;
+	GetBlockLittleEndian((TUint8*)&aBlock[0], 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((TUint8*)&aBlock[0], R0, R1, R2, R3);
+	}
+
+#pragma warning (default : 4244)	//	conversion from 'int' to 'unsigned short', possible loss of data
+
+CRC2Decryptor::CRC2Decryptor(void)
+	{
+	}