cryptoplugins/cryptospiplugins/source/softwarecrypto/randomimpl.cpp
author Mikko Sunikka <mikko.sunikka@nokia.com>
Fri, 06 Nov 2009 13:21:00 +0200
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permissions -rw-r--r--
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/*
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* Copyright (c) 2005-2009 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of the License "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description: 
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*
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*/
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/**
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 @file
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*/
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#include <e32std.h>
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#include <e32debug.h>
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#include "randomimpl.h"
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#include "pluginentry.h"
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#include "pluginconfig.h"
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#include "randsvr.h"
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#include "randcliserv.h"
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#include "randsvrimpl.h"
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_LIT(KRandomServerImg,"z:\\sys\\bin\\randsvr.exe");		// DLL/EXE name
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_LIT(KRandomServerConnect, "Randsvr connect");
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_LIT(KRandomServerGet, "Randsvr get");
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const TUid KServerUid3={0x100066dc};
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using namespace SoftwareCrypto;
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CRandomImpl* CRandomImpl::NewL(void)
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	{
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	CRandomImpl* self = new(ELeave)CRandomImpl();
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	return self;
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	}
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CRandomImpl* CRandomImpl::NewLC(void)
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	{
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	CRandomImpl* self = NewL();
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	CleanupStack::PushL(self);
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	return self;
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	}
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void CRandomImpl::GenerateRandomBytesL(TDes8& aDest)
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	{
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	TRandomImpl::Random(aDest);
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	}
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CRandomImpl::CRandomImpl(void)
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	{
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	}
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void TRandomImpl::Random(TDes8& aDestination)
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	{
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	RRandomSessionImpl rs;
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	TRAPD(ret,rs.ConnectL());
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	if (ret != KErrNone)
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		{
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		User::Panic(KRandomServerConnect, ret);
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		}
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	TInt err=rs.GetRandom(aDestination);
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	if (err != KErrNone)
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		{
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		User::Panic(KRandomServerGet, err);
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		}
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	rs.Close();
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	}
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void CRandomImpl::GetCharacteristicsL(const TCharacteristics*& aPluginCharacteristics)
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	{
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	TInt randomNum = sizeof(KRandomCharacteristics)/sizeof(TRandomCharacteristics*);
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	for (TInt i = 0; i < randomNum; i++)
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		{
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		if (KRandomCharacteristics[i]->cmn.iImplementationUID == ImplementationUid().iUid)
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			{
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			aPluginCharacteristics = KRandomCharacteristics[i];
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			break;
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			}
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		}
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	}
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CExtendedCharacteristics* CRandomImpl::CreateExtendedCharacteristicsL()
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	{
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	// All Symbian software plug-ins have unlimited concurrency, cannot be reserved
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	// for exclusive use and are not CERTIFIED to be standards compliant.
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	return CExtendedCharacteristics::NewL(KMaxTInt, EFalse);
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	}
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const CExtendedCharacteristics* CRandomImpl::GetExtendedCharacteristicsL()
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	{
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	return CRandomImpl::CreateExtendedCharacteristicsL();
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	}
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TUid CRandomImpl::ImplementationUid() const
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	{
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	return KCryptoPluginRandomUid;
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	}
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CRandomImpl::~CRandomImpl()
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	{
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	}
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void CRandomImpl::Close()
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	{
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	delete this;
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	}
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// All crypto plugins must implement this, to reset
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// hardware if required. Do nothing in this version
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void CRandomImpl::Reset()
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	{
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	}
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RRandomSessionImpl::RRandomSessionImpl(void)
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	{
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	}
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static TInt StartServer()
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// Borrowed from AndrewT's server startup code.
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// Start the server process/thread which lives in an EPOCEXE object
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//
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	{
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	const TUidType serverUid(KNullUid,KNullUid,KServerUid3);
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	//
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	// EPOC and EKA2 is easy, we just create a new server process. Simultaneous
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	// launching of two such processes should be detected when the second one
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	// attempts to create the server object, failing with KErrAlreadyExists.
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	//
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	RProcess server;
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	TInt r=server.Create(KRandomServerImg, KNullDesC, serverUid);
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	if (r!=KErrNone)
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		return r;
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	TRequestStatus stat;
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	server.Rendezvous(stat);
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	if (stat!=KRequestPending)
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		server.Kill(0);		// abort startup
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	else
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		server.Resume();	// logon OK - start the server
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	User::WaitForRequest(stat);		// wait for start or death
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	// we can't use the 'exit reason' if the server panicked as this
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	// is the panic 'reason' and may be '0' which cannot be distinguished
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	// from KErrNone
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	r=(server.ExitType()==EExitPanic) ? KErrGeneral : stat.Int();
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	server.Close();
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	return r;
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	}
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void RRandomSessionImpl::ConnectL(void)
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	{
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	TInt retry=2;
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	for (;;)
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		{
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		// Magic number 1 below is the number of asynchronous message slots
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		TInt r = CreateSession(KRandomServerName,TVersion(0,0,0), 1);
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		if (r == KErrNone) return;
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		// We used to leave with KErrNone, but this is inefficient and
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		// provokes an emulator problem in User::Leave which causes tpbe to crash
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		// if (r == KErrNone) User::Leave(r);   // Connected okay
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		if (r != KErrNotFound && r != KErrServerTerminated)
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			   User::Leave(r);   // Something else happened
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		if (--retry == 0)
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			User::Leave(r);      // Give up after a while
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		r = StartServer();       // Try starting again
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		if (r != KErrNone && r != KErrAlreadyExists)
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			User::Leave(r);
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		}
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	}
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TInt RRandomSessionImpl::GetRandom(TDes8& aDestination)
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	{
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	TInt desclength = aDestination.Length();
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	for ( TInt i = 0; i < desclength; i += KRandomBlockSize)
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		{
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		TInt getlen = Min(KRandomBlockSize, desclength - i);
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		TPtr8 buffer(&aDestination[i], KRandomBlockSize, KRandomBlockSize);
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		TInt err = SendReceive(CRandomSession::KRandomRequest, TIpcArgs(&buffer, getlen));
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		if (err != KErrNone)
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			{
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			return err;
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			}
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		}
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	return KErrNone;
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	}
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// Methods which are not supported can be excluded from the coverage.
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#ifdef _BullseyeCoverage
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#pragma suppress_warnings on
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#pragma BullseyeCoverage off
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#pragma suppress_warnings off
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#endif
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TAny* CRandomImpl::GetExtension(TUid /*aExtensionId*/)
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	{
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	return NULL;
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	}