sl@0: /*
sl@0: * Copyright (c) 2006-2010 Nokia Corporation and/or its subsidiary(-ies).
sl@0: * All rights reserved.
sl@0: * This component and the accompanying materials are made available
sl@0: * under the terms of the License "Eclipse Public License v1.0"
sl@0: * which accompanies this distribution, and is available
sl@0: * at the URL "http://www.eclipse.org/legal/epl-v10.html".
sl@0: *
sl@0: * Initial Contributors:
sl@0: * Nokia Corporation - initial contribution.
sl@0: *
sl@0: * Contributors:
sl@0: *
sl@0: * Description: 
sl@0: * random shim implementation
sl@0: * random shim implementation
sl@0: *
sl@0: */
sl@0: 
sl@0: 
sl@0: /**
sl@0:  @file
sl@0: */
sl@0: 
sl@0: #include "randomshim.h"
sl@0: #include <cryptospi/cryptospidef.h>
sl@0: #include <cryptospi/cryptorandomapi.h>
sl@0: #include <cryptospi/plugincharacteristics.h>
sl@0: #include <cryptospi/keys.h>
sl@0: #include <e32debug.h>
sl@0: #include "securityerr.h"
sl@0: 
sl@0: using namespace CryptoSpi;
sl@0: 
sl@0: _LIT(KRandomFail, "Cannot obtain randomness");
sl@0: 
sl@0: //
sl@0: // Random shim implementation
sl@0: //
sl@0: CRandomShim* CRandomShim::NewL()
sl@0: 	{
sl@0: 	CRandomShim* self = CRandomShim::NewLC();
sl@0: 	CleanupStack::Pop();
sl@0: 	return self;
sl@0: 	}
sl@0: 
sl@0: CRandomShim* CRandomShim::NewLC()
sl@0: 	{
sl@0: 	CRandomShim* self = new(ELeave) CRandomShim();
sl@0: 	CleanupStack::PushL(self);
sl@0: 	self->ConstructL();
sl@0: 	return self;
sl@0: 	}
sl@0: 
sl@0: void CRandomShim::GenerateBytesL(TDes8& aDest)
sl@0: 	{	
sl@0: 	iRandomImpl->GenerateRandomBytesL(aDest);
sl@0: 	}
sl@0: 
sl@0: CRandomShim::CRandomShim()
sl@0: 	{
sl@0: 	}
sl@0: 
sl@0: CRandomShim::~CRandomShim()
sl@0: 	{
sl@0: 	delete iRandomImpl;
sl@0: 	}
sl@0: 	
sl@0: void CRandomShim::ConstructL()
sl@0: 	{
sl@0: 	CRandomFactory::CreateRandomL(iRandomImpl, KRandomUid, NULL);	
sl@0: 	}
sl@0: 
sl@0: /**
sl@0:  * @deprecated Use RandomL() instead
sl@0:  * @panic This function can panic under low memory conditions
sl@0:  * See PDEF097319: TRandom::Random panics during OOM
sl@0:  * This method is preserved only for BC reasons
sl@0:  */
sl@0: void TRandomShim::Random(TDes8& aDest)
sl@0: 	{
sl@0: 	CRandomShim* rand = NULL;
sl@0: 	TRAPD(ret, rand = CRandomShim::NewL());
sl@0: 	if (ret != KErrNone)
sl@0: 		{
sl@0: 		User::Panic(KRandomFail, ret);
sl@0: 		}
sl@0: 	TRAPD(ret2, rand->GenerateBytesL(aDest));
sl@0: 	delete rand;
sl@0: 	if ((ret2 != KErrNone) && (ret2 != KErrNotSecure))
sl@0: 		{
sl@0: 		// this method can't leave so the cleanup stack can't be used (because of PushL()) 
sl@0: 		// so we just delete the randon shim here if GenerateBytesL() leaves
sl@0: 		User::Panic(KRandomFail, ret);
sl@0: 		}
sl@0: 	}
sl@0: 
sl@0: void TRandomShim::RandomL(TDes8& aDest)
sl@0: 	{
sl@0: 	CRandomShim* rand = CRandomShim::NewL();
sl@0: 	CleanupStack::PushL(rand);
sl@0: 	
sl@0: 	TRAPD(error, rand->GenerateBytesL(aDest));
sl@0: 	CleanupStack::PopAndDestroy(rand); // Use a singleton, avoid new overhead?
sl@0: 	
sl@0: 	// This method should leave on low memory conditions.
sl@0: 	if(error == KErrNoMemory)
sl@0: 		{
sl@0: 		User::Leave(error);	
sl@0: 		}
sl@0: 	}	
sl@0: 
sl@0: void TRandomShim::SecureRandomL(TDes8& aDest)
sl@0: 	{
sl@0: 	CRandomShim* rand = CRandomShim::NewLC();	
sl@0: 	
sl@0: 	rand->GenerateBytesL(aDest);
sl@0: 	CleanupStack::PopAndDestroy(rand);	
sl@0: 	}