/*

* 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 "rc2shim.h"

#include <cryptospi/cryptoparams.h>

#include "cryptosymmetriccipherapi.h"

#include <cryptospi/cryptospidef.h>

#include <cryptospi/plugincharacteristics.h>

#include "keys.h"

#include <cryptostrength.h>

#include "../common/inlines.h"

using namespace CryptoSpi;

// CRC2EncryptorShim ////////////////////////////////////////////////////////

CRC2EncryptorShim* CRC2EncryptorShim::NewL(const TDesC8& aKey, TInt aEffectiveKeyLenBits)

	{

	CRC2EncryptorShim* self = CRC2EncryptorShim::NewLC(aKey, aEffectiveKeyLenBits);

	CleanupStack::Pop(self);

	return self;

	}

CRC2EncryptorShim* CRC2EncryptorShim::NewLC(const TDesC8& aKey, TInt aEffectiveKeyLenBits)

	{

	CRC2EncryptorShim* self = new (ELeave) CRC2EncryptorShim();

	CleanupStack::PushL(self);

	self->ConstructL(aKey, aEffectiveKeyLenBits);

	// weak enough if either aKey or aEffectiveKeyLenBits is weak

	TInt minKeySize = Min(aEffectiveKeyLenBits, BytesToBits(aKey.Size()));

	TCrypto::IsSymmetricWeakEnoughL(minKeySize);

	return self;

	}

CRC2EncryptorShim::CRC2EncryptorShim()

	{

	}

CRC2EncryptorShim::~CRC2EncryptorShim()

	{

	delete iSymmetricCipherImpl;

	delete iKey;	

	delete iAlgorithmParams;

	}	

void CRC2EncryptorShim::ConstructL(const TDesC8& aKey, TInt aEffectiveKeyLenBits)

	{

	TKeyProperty keyProperty = {KRc2Uid, KNullUid, KSymmetricKeyUid, KNonEmbeddedKeyUid};

	CCryptoParams* keyParam =CCryptoParams::NewLC();

	keyParam->AddL(aKey, KSymmetricKeyParameterUid);

	iKey=CKey::NewL(keyProperty, *keyParam);

	CleanupStack::PopAndDestroy(keyParam);

	iAlgorithmParams = CCryptoParams::NewL();

	iAlgorithmParams->AddL(aEffectiveKeyLenBits, KRC2EffectiveKeyLenBits);

	CSymmetricCipherFactory::CreateSymmetricCipherL(

											iSymmetricCipherImpl,

											KRc2Uid,

											*iKey,

											KCryptoModeEncryptUid,

											KOperationModeECBUid,

											KPaddingModeNoneUid,

											iAlgorithmParams);

	}		

TInt CRC2EncryptorShim::BlockSize() const

	{

	// SPI returns block size in BITS

	return BitsToBytes(iSymmetricCipherImpl->BlockSize());

	}	

TInt CRC2EncryptorShim::KeySize() const

	{

	return iSymmetricCipherImpl->KeySize();

	}	

void CRC2EncryptorShim::Transform(TDes8& aBlock)

	{

	iOutputBlock.Zero();

	TRAP_IGNORE(iSymmetricCipherImpl->ProcessL(aBlock, iOutputBlock);)

	aBlock = iOutputBlock;

	}

void CRC2EncryptorShim::Reset()

	{

	iSymmetricCipherImpl->Reset();

	}	

TInt CRC2EncryptorShim::Extension_(TUint aExtensionId, TAny*& a0, TAny* /*a1*/)

	{

	TInt ret(KErrExtensionNotSupported);

	if (KSymmetricCipherInterface == aExtensionId && iSymmetricCipherImpl)

		{

		a0=iSymmetricCipherImpl;

		ret=KErrNone;	

		}		

	return ret;

	}	

// CRC2DecryptorShim ////////////////////////////////////////////////////////

CRC2DecryptorShim* CRC2DecryptorShim::NewL(const TDesC8& aKey, TInt aEffectiveKeyLenBits)

	{

	CRC2DecryptorShim* self = CRC2DecryptorShim::NewLC(aKey, aEffectiveKeyLenBits);

	CleanupStack::Pop(self);

	return self;

	}

CRC2DecryptorShim* CRC2DecryptorShim::NewLC(const TDesC8& aKey, TInt aEffectiveKeyLenBits)

	{

	CRC2DecryptorShim* self = new (ELeave) CRC2DecryptorShim();

	CleanupStack::PushL(self);

	self->ConstructL(aKey, aEffectiveKeyLenBits);

	// weak enough if either aKey or aEffectiveKeyLenBits is weak

	TInt minKeySize = Min(aEffectiveKeyLenBits, BytesToBits(aKey.Size()));

	TCrypto::IsSymmetricWeakEnoughL(minKeySize);

	return self;

	}

CRC2DecryptorShim::CRC2DecryptorShim()

	{	

	}

CRC2DecryptorShim::~CRC2DecryptorShim()

	{

	delete iSymmetricCipherImpl;

	delete iKey;

	delete iAlgorithmParams;			

	}

void CRC2DecryptorShim::ConstructL(const TDesC8& aKey, TInt aEffectiveKeyLenBits)

	{

	TKeyProperty keyProperty = {KRc2Uid, KNullUid, KSymmetricKeyUid, KNonEmbeddedKeyUid};

	CCryptoParams* keyParam =CCryptoParams::NewLC();

	keyParam->AddL(aKey, KSymmetricKeyParameterUid);

	iKey=CKey::NewL(keyProperty, *keyParam);

	CleanupStack::PopAndDestroy(keyParam);

	iAlgorithmParams = CCryptoParams::NewL();

	iAlgorithmParams->AddL(aEffectiveKeyLenBits, KRC2EffectiveKeyLenBits);

	CSymmetricCipherFactory::CreateSymmetricCipherL(

												iSymmetricCipherImpl,

												KRc2Uid,

												*iKey,

												KCryptoModeDecryptUid,

												KOperationModeECBUid,

												KPaddingModeNoneUid,

												iAlgorithmParams);	

	}	

TInt CRC2DecryptorShim::BlockSize() const

	{

	// SPI returns block size in BITS

	return BitsToBytes(iSymmetricCipherImpl->BlockSize());

	}

TInt CRC2DecryptorShim::KeySize() const

	{

	return iSymmetricCipherImpl->KeySize();

	}	

void CRC2DecryptorShim::Transform(TDes8& aBlock)

	{

	iOutputBlock.Zero();	

	TRAP_IGNORE(iSymmetricCipherImpl->ProcessL(aBlock, iOutputBlock);)

	aBlock = iOutputBlock;	

	}

void CRC2DecryptorShim::Reset()

	{

	iSymmetricCipherImpl->Reset();

	}

TInt CRC2DecryptorShim::Extension_(TUint aExtensionId, TAny*& a0, TAny* /*a1*/)

	{

	TInt ret(KErrExtensionNotSupported);

	if (CryptoSpi::KSymmetricCipherInterface == aExtensionId && iSymmetricCipherImpl)

		{

		a0=iSymmetricCipherImpl;

		ret=KErrNone;	

		}		

	return ret;

	}