/*

* Copyright (c) 2006-2010 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: 

* blocktransformationshim.cpp

*

*/

#include "bufferedtransformationshim.h"

#include <cryptospi/cryptospidef.h>

#include <padding.h>

#include <cryptospi/cryptosymmetriccipherapi.h>

#include <cryptospi/plugincharacteristics.h>

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

// CBufferedEncryptorShim

CBufferedEncryptorShim::CBufferedEncryptorShim(CryptoSpi::CSymmetricCipher* aSymmetricCipherImpl) :

	iSymmetricCipherImpl(aSymmetricCipherImpl)

	{

	}

CBufferedEncryptorShim* CBufferedEncryptorShim::NewL(CBlockTransformation* aBT, CPadding* aPadding)

	{

	CBufferedEncryptorShim* self(0);

	// Check whether the block transform contains an SPI plug-in

	TAny* implPtr(0);

	TInt err = aBT->GetExtension(CryptoSpi::KSymmetricCipherInterface, implPtr, NULL);	

	if (err == KErrNone && implPtr)

		{

		CryptoSpi::CSymmetricCipher* impl(static_cast<CryptoSpi::CSymmetricCipher*>(implPtr));

		const CryptoSpi::TCharacteristics* c(0);

		impl->GetCharacteristicsL(c);

		const CryptoSpi::TSymmetricCipherCharacteristics* cipherCharacteristics(

			static_cast<const CryptoSpi::TSymmetricCipherCharacteristics*>(c));

		// See if the padding mode is recognised by CryptoSpi and if so, check

		// whether the plug-in supports that padding mode.

		TUid paddingMode;

		TAny* paddingPtr = &paddingMode;		

		err = aPadding->GetExtension(CryptoSpi::KPaddingInterface, paddingPtr, 0);		

		if (err == KErrNone && cipherCharacteristics->IsPaddingModeSupported(paddingMode))

			{

			impl->SetCryptoModeL(CryptoSpi::KCryptoModeEncryptUid);

			impl->SetPaddingModeL(paddingMode);		

			self = new(ELeave) CBufferedEncryptorShim(impl);

			CleanupStack::PushL(self);

			self->ConstructL(aBT, aPadding);

			CleanupStack::Pop(self);

			}

		}				

	return self;

	}

void CBufferedEncryptorShim::ConstructL(CBlockTransformation* aBT, CPadding* aPadding)

	{

	CBufferedEncryptor::ConstructL(aBT, aPadding);

	}

void CBufferedEncryptorShim::Process(const TDesC8& aInput, TDes8& aOutput)

	{

	TRAP_IGNORE(iSymmetricCipherImpl->ProcessL(aInput, aOutput);)

	}

TInt CBufferedEncryptorShim::MaxOutputLength(TInt aInputLength) const

	{

	return iSymmetricCipherImpl->MaxOutputLength(aInputLength);

	}

void CBufferedEncryptorShim::Reset()

	{

	iSymmetricCipherImpl->Reset();

	}

TInt CBufferedEncryptorShim::BlockSize() const

	{

	return BitsToBytes(iSymmetricCipherImpl->BlockSize());

	}

TInt CBufferedEncryptorShim::KeySize() const

	{

	return iSymmetricCipherImpl->KeySize();

	}

void CBufferedEncryptorShim::ProcessFinalL(const TDesC8& aInput, TDes8& aOutput)

	{

	iSymmetricCipherImpl->ProcessFinalL(aInput, aOutput);

	}

TInt CBufferedEncryptorShim::MaxFinalOutputLength(TInt aInputLength) const

	{

	return iSymmetricCipherImpl->MaxFinalOutputLength(aInputLength);

	}

// CBufferedDecryptorShim

CBufferedDecryptorShim::CBufferedDecryptorShim(CryptoSpi::CSymmetricCipher* aSymmetricCipherImpl) :

	iSymmetricCipherImpl(aSymmetricCipherImpl)

	{

	}

CBufferedDecryptorShim* CBufferedDecryptorShim::NewL(CBlockTransformation* aBT, CPadding* aPadding)

	{

	CBufferedDecryptorShim* self(0);

	// Check whether the block transform contains an SPI plug-in

	TAny* implPtr(0);

	TInt err = aBT->GetExtension(CryptoSpi::KSymmetricCipherInterface, implPtr, NULL);	

	if (err == KErrNone && implPtr)

		{

		CryptoSpi::CSymmetricCipher* impl(static_cast<CryptoSpi::CSymmetricCipher*>(implPtr));

		const CryptoSpi::TCharacteristics* c(0);

		impl->GetCharacteristicsL(c);

		const CryptoSpi::TSymmetricCipherCharacteristics* cipherCharacteristics(

			static_cast<const CryptoSpi::TSymmetricCipherCharacteristics*>(c));

		// See if the padding mode is recognised by CryptoSpi and if so, check

		// whether the plug-in supports that padding mode.

		TUid paddingMode;

		TAny* paddingPtr = &paddingMode;		

		err = aPadding->GetExtension(CryptoSpi::KPaddingInterface, paddingPtr, 0);		

		if (err == KErrNone && cipherCharacteristics->IsPaddingModeSupported(paddingMode))

			{

			impl->SetCryptoModeL(CryptoSpi::KCryptoModeDecryptUid);			

			impl->SetPaddingModeL(paddingMode);

			self = new(ELeave) CBufferedDecryptorShim(impl);

			CleanupStack::PushL(self);

			self->ConstructL(aBT, aPadding);

			CleanupStack::Pop(self);

			}

		}				

	return self;

	}

void CBufferedDecryptorShim::ConstructL(CBlockTransformation* aBT, CPadding* aPadding)

	{

	CBufferedDecryptor::ConstructL(aBT, aPadding);

	}

void CBufferedDecryptorShim::Process(const TDesC8& aInput, TDes8& aOutput)

	{

	TRAP_IGNORE(iSymmetricCipherImpl->ProcessL(aInput, aOutput);)

	}

TInt CBufferedDecryptorShim::MaxOutputLength(TInt aInputLength) const

	{

	return iSymmetricCipherImpl->MaxOutputLength(aInputLength);

	}

void CBufferedDecryptorShim::Reset()

	{

	iSymmetricCipherImpl->Reset();

	}

TInt CBufferedDecryptorShim::BlockSize() const

	{

	return BitsToBytes(iSymmetricCipherImpl->BlockSize());

	}

TInt CBufferedDecryptorShim::KeySize() const

	{

	return iSymmetricCipherImpl->KeySize();

	}

void CBufferedDecryptorShim::ProcessFinalL(const TDesC8& aInput, TDes8& aOutput)

	{

	iSymmetricCipherImpl->ProcessFinalL(aInput, aOutput);

	}

TInt CBufferedDecryptorShim::MaxFinalOutputLength(TInt aInputLength) const

	{

	return iSymmetricCipherImpl->MaxFinalOutputLength(aInputLength);

	}