/*

* 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: 

* random shim implementation

* random shim implementation

*

*/

/**

 @file

*/

#include "randomshim.h"

#include <cryptospi/cryptospidef.h>

#include <cryptospi/cryptorandomapi.h>

#include <cryptospi/plugincharacteristics.h>

#include "keys.h"

#include <e32debug.h>

using namespace CryptoSpi;

_LIT(KRandomFail, "Cannot obtain randomness");

//

// Random shim implementation

//

CRandomShim* CRandomShim::NewL()

	{

	CRandomShim* self = CRandomShim::NewLC();

	CleanupStack::Pop();

	return self;

	}

CRandomShim* CRandomShim::NewLC()

	{

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

	CleanupStack::PushL(self);

	self->ConstructL();

	return self;

	}

void CRandomShim::GenerateBytesL(TDes8& aDest)

	{

	iRandomImpl->GenerateRandomBytesL(aDest);

	}

CRandomShim::CRandomShim()

	{

	}

CRandomShim::~CRandomShim()

	{

	delete iRandomImpl;

	}

void CRandomShim::ConstructL()

	{

	CRandomFactory::CreateRandomL(iRandomImpl, KRandomUid, NULL);

	}

/**

 * @deprecated Use RandomL() instead

 * @panic This function can panic under low memory conditions

 * See PDEF097319: TRandom::Random panics during OOM

 * This method is preserved only for BC reasons

 */

void TRandomShim::Random(TDes8& aDest)

	{

	CRandomShim* rand = NULL;

	TRAPD(ret, rand = CRandomShim::NewL());

	if (ret != KErrNone)

		{

		User::Panic(KRandomFail, ret);

		}

	TRAPD(ret2, rand->GenerateBytesL(aDest));

	delete rand;

	if (ret2 != KErrNone)

		{

		// this method can't leave so the cleanup stack can't be used (because of PushL()) 

		// so we just delete the randon shim here if GenerateBytesL() leaves

		User::Panic(KRandomFail, ret);

		}

	}

void TRandomShim::RandomL(TDes8& aDest)

	{

	CRandomShim* rand = CRandomShim::NewL();

	CleanupStack::PushL(rand);

	rand->GenerateBytesL(aDest);

	CleanupStack::PopAndDestroy(rand); // Use a singleton, avoid new overhead?

	}