/*

 * Copyright (c) 1998-2009 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 "CorruptionTest.h"

 #include "wtlscert.h"

 #include "tcertutils.h"

 #include "t_output.h"

 #include "t_input.h"

 #include <random.h>

 #include <asymmetric.h>

 #include <bigint.h>

 #include <hash.h>

 #include <securityerr.h>

 TInt CCorruptionTest::nInstances = 0;

 _LIT(KCorruptLogFile, "WTLSCERTCorruptLog.txt");

 _LIT(KPathStart, "<path>");

 _LIT(KIterationsStart, "<iterations>");

 //////////////////////////////////////////////////////////////////////

 // Construction/Destruction

 //////////////////////////////////////////////////////////////////////

 CTestAction* CCorruptionTest::NewL(RFs& aFs, CConsoleBase& aConsole, 

 		Output& aOut, const TTestActionSpec& aTestActionSpec)

 	{

 	CTestAction* self = CCorruptionTest::NewLC(aFs, aConsole, aOut, aTestActionSpec);

 	CleanupStack::Pop(self);

 	return self;

 	}

 CTestAction* CCorruptionTest::NewLC(RFs& aFs, CConsoleBase& aConsole, 

 		Output& aOut, const TTestActionSpec& aTestActionSpec)

 	{

 	CCorruptionTest* self = new(ELeave) CCorruptionTest(aFs, aConsole, aOut);

 	CleanupStack::PushL(self);

 	self->ConstructL(aTestActionSpec);

 	return self;

 	}

 CCorruptionTest::CCorruptionTest(RFs& aFs, 

 								 CConsoleBase& aConsole,

 								 Output& aOut)

 : CTestAction(aConsole, aOut), iFs(aFs)

 	{

 	nFileNumber = 0;

 	}

 CCorruptionTest::~CCorruptionTest(void)

 	{

 	delete iDirList;

 	delete iWriter;

 	iLogFile.Close();

 	delete iNullOut;

 	delete iCorruptOut;

 	};

 void CCorruptionTest::ConstructL(const TTestActionSpec& aTestActionSpec)

 	{

 	CTestAction::ConstructL(aTestActionSpec);

 	if(nInstances==0)

 		{

 		nInstances++;

 		TInt pos=0;

 		HBufC* body = HBufC::NewLC(aTestActionSpec.iActionBody.Length());

 		iNullOut = new(ELeave) NullOutput;

 		body->Des().Copy(aTestActionSpec.iActionBody);

 		TPtrC chainBuf = Input::ParseElement(*body, KPathStart, pos);

 		iPath.Copy(chainBuf);

 		TPtrC itertaionBuf = Input::ParseElement(*body, KIterationsStart, pos);

 		TLex itLex(itertaionBuf);

 		itLex.Val(iIterations);

 		CleanupStack::PopAndDestroy();

 		User::LeaveIfError(iLogFile.Replace(iFs,KCorruptLogFile,EFileWrite));

 		iCorruptOut = new(ELeave) FileOutput(iLogFile);

 		iWriter = new(ELeave) WTLSCertWriter(iCorruptOut);

 		}

 	else

 		{

 		SetScriptError(ESyntax, _L("Only one corruption test can be run in each script"));

 		iFinished = ETrue;

 		}

 	}

 void CCorruptionTest::DoPerformPrerequisite(TRequestStatus& aStatus)

 	{

 	HBufC *searchPath = HBufC::NewLC(iPath.Size() + 1);

 	TPtr searchPathPtr(searchPath->Des());

 	searchPathPtr.Copy(iPath);

 	searchPathPtr.Append(_L("*"));

     TInt err = iFs.GetDir(searchPathPtr, KEntryAttMaskSupported, ESortByName, iDirList);

 	if (err != KErrNone)

 		{

 		iConsole.Printf(_L("Error getting directory "));

 		iConsole.Printf(searchPathPtr);

 		iConsole.Printf(_L("\n"));

 		iOut.writeString(_L("Error getting directory "));

 		iOut.writeString(searchPathPtr);

 		iOut.writeNewLine();

 		iFinished = ETrue;

 		TRequestStatus* status = &aStatus;

 		User::RequestComplete(status, KErrNone);

 		SetScriptError(EFileNotFound, searchPathPtr);

 		}

 	else

 		{

 		iConsole.Printf(_L("Please view "));

 		iConsole.Printf(KCorruptLogFile);

 		iConsole.Printf(_L(" for results\n"));

 		iOut.writeString(_L("Please view "));

 		iOut.writeString(KCorruptLogFile);

 		iOut.writeString(_L(" for results"));

 		iOut.writeNewLine();

 		iActionState = EAction;

 		TRequestStatus* status = &aStatus;

 		User::RequestComplete(status, KErrNone);

 		iResult = ETrue;

 		}

 	CleanupStack::PopAndDestroy();

 	}

 void CCorruptionTest::DoPerformPostrequisite(TRequestStatus& aStatus)

 	{

 	TRequestStatus* status = &aStatus;

 	iFinished = ETrue;

 	User::RequestComplete(status, KErrNone);

 	}

 void CCorruptionTest::RunCorruptionTestL(const TDesC &aFilename)

 	{

 	CSystemRandom *random = CSystemRandom::NewLC();

 	iWriter->SetOut(iNullOut);

 	for (TInt i = 0; i < iIterations; i++)

 		{

 		HBufC8* buf = Input::ReadFileLC(aFilename, iPath, iFs);

 		TPtr8 pBuf = buf->Des();

 		TInt len = pBuf.Size();

 		TInt pos = 0;

 				//list of positions altered

 		HBufC* posOctsBuf = HBufC::NewLC(70);

 		TPtr pPosOctsBuf = posOctsBuf->Des();

 		pPosOctsBuf.SetLength(0);

 		pPosOctsBuf.Append(_L("p:"));

 				//list of octets altered

 		HBufC8* octsBuf = HBufC8::NewLC(40);

 		TPtr8 pOctsBuf = octsBuf->Des();

 		pOctsBuf.SetLength(0);

 		for (TInt j = 0; j < 10; j++)

 			{

 				//randomness

 			HBufC8* rand = HBufC8::NewLC(5);

 			TPtr8 pRand = rand->Des();

 			pRand.SetLength(5);

 			TRAPD(err, random->GenerateBytesL(pRand));

 			if((err != KErrNone) && (err != KErrNotSecure))

 				User::Leave(err);

 			TUint num = 0;

 			for (TInt k = 0; k < 4 ; k++)

 				{

 				num<<=8;

 				num+=pRand[k];

 				}

 			pos = num % len;

 			TUint8 newOctet = pRand[4];

 				//update output lines

 			pPosOctsBuf.AppendNum(pos);

 			pPosOctsBuf.Append(_L(" "));

 			pOctsBuf.Append(pBuf.Mid(pos, 1));

 			TPtrC8 pNewOct = pRand.Right(1);

 			pOctsBuf.Append(pNewOct);

 			//switch the selected octet

 			pBuf[pos] = newOctet;

 			//file out

 			iCorruptOut->writeString(pPosOctsBuf);

 			iCorruptOut->writeNewLine();

 			iCorruptOut->writeString(_L("o:"));

 			iCorruptOut->writeOctetString(pOctsBuf);

 			iCorruptOut->writeNewLine();

 			//try to make corrupt cert

 			CWTLSCertificate* cert = NULL;

 			TRAP(err, cert = CWTLSCertificate::NewL(pBuf));

 			CleanupStack::PushL(cert);

 			if (err == KErrNone)

 				{

 				TRAP_IGNORE(iWriter->WriteCert(*cert));

 				TBool res = EFalse;;

 			//	Don't bother attempting to verify if public key modulus is an even

 			//	value since CMontgomery methods will panic

 				CRSAPublicKey* key = CWTLSRSAPublicKey::NewL(cert->PublicKey().KeyData());

 				const TInteger& theN = key->N();

 				if (theN.IsOdd())

 					{//	Check that the signature is an appropriate value for the key

 					//	Otherwise the crypto library will panic (descriptor out of bounds)

 					RInteger input = RInteger::NewL(cert->Signature());

 					CleanupStack::PushL(input);

 					if ( (input < theN) && (input > 0) )

 						{

 						TRAP_IGNORE(res = cert->VerifySignatureL(cert->PublicKey().KeyData()));

 						if (res)

 							{

 							iCorruptOut->writeString(_L("!!!"));

 							iCorruptOut->writeNewLine();

 							}

 						}

 					CleanupStack::PopAndDestroy(&input);

 					}

 					delete key;

 				}

 			iCorruptOut->writeString(_L("r:"));

 			iCorruptOut->writeNum(err);

 			iCorruptOut->writeNewLine();

 			CleanupStack::PopAndDestroy(2);//cert, randomness

 			}

 		CleanupStack::PopAndDestroy(3);//

 		}

 	CleanupStack::PopAndDestroy(1); //random

 	iWriter->SetOut(iCorruptOut);

 	}

 void CCorruptionTest::PerformAction(TRequestStatus& aStatus)

 	{

 	TBuf<256> filename = (*iDirList)[nFileNumber].iName;

 	CSHA1* hash = NULL;

 	TRAP_IGNORE(hash = CSHA1::NewL());

 	iCorruptOut->writeString(_L("file:"));

 	iCorruptOut->writeString(filename);

 	iCorruptOut->writeNewLine();

 	iConsole.Printf(_L("file:%S\n"), &filename);

 	TRAP_IGNORE(RunCorruptionTestL(filename));

 	nFileNumber++;

 	if(nFileNumber == iDirList->Count())

 		{

 		iActionState = EPostrequisite;

 		};

 	TRequestStatus* status = &aStatus;

 	User::RequestComplete(status, KErrNone);

 	delete hash;

 	}

 void CCorruptionTest::DoReportAction()

 	{

 	}

 void CCorruptionTest::DoCheckResult(TInt /*aError*/)

 	{

 	}