/*

* 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: 

* Example CTestStep derived implementation

*

*/

/**

 @file

 @internalTechnology

*/

#include "mac_incremental_reset_step.h"

#include <cryptospi/cryptomacapi.h>

#include <cryptospi/plugincharacteristics.h>

using namespace CryptoSpi;

CMacIncrementalResetStep::~CMacIncrementalResetStep()

	{

	}

CMacIncrementalResetStep::CMacIncrementalResetStep()

	{

	SetTestStepName(KMacIncrementalResetStep);

	}

TVerdict CMacIncrementalResetStep::doTestStepPreambleL()

	{

	return EPass;

	}

TVerdict CMacIncrementalResetStep::doTestStepL()

	{

	//Assume faliure, unless all is successful

	SetTestStepResult(EFail);

	INFO_PRINTF1(_L("*** Mac - Incremental with Reset ***"));

	INFO_PRINTF2(_L("HEAP CELLS: %d"), User::CountAllocCells());

	TVariantPtrC algorithmUid;

	TPtrC sourcePath;

	TPtrC expectedMac;

	TPtrC encryptKey;

	TVariantPtrC keyType;

	//Extract the Test Case ID parameter from the specified INI file

	if (!GetStringFromConfig(ConfigSection(),KConfigAlgorithmUid,algorithmUid) ||

		!GetStringFromConfig(ConfigSection(),KConfigSourcePath,sourcePath) ||

		!GetStringFromConfig(ConfigSection(),KConfigExMacValue,expectedMac) ||

		!GetStringFromConfig(ConfigSection(),KConfigEncryptKey,encryptKey) ||

		!GetStringFromConfig(ConfigSection(),KConfigEncryptKeyType,keyType))

		{

		ERR_PRINTF1(_L("** Error: Failed to Load Configuration Parameters **"));

		return EFail;

		}

	//Create a pointer for the Hmac Implementation Object

	CMac* macImpl= NULL;

	//Convert encryption key to an 8 Bit Descriptor

	HBufC8* keyStr = HBufC8::NewLC(encryptKey.Length());

	TPtr8 keyStrPtr = keyStr->Des();

	keyStrPtr.Copy(encryptKey);

	//Create an new CryptoParams object to encapsulate the key type and secret key string

	CCryptoParams* keyParams = CCryptoParams::NewL();

	CleanupStack::PushL(keyParams);

	keyParams->AddL(*keyStr, keyType);

	//Create Key Object

	TKeyProperty keyProperty;

	CKey* key=CKey::NewL(keyProperty,*keyParams);

	CleanupStack::PushL(key);

	//Retrieve a Mac Factory Object			

	TRAPD(err,CMacFactory::CreateMacL(macImpl,

										algorithmUid,

										*key,

										NULL));											

	if (err != KErrNone)

		{

		CleanupStack::PopAndDestroy(3, keyStr);	// keyStr, keyParams, key

		delete macImpl;

		ERR_PRINTF2(_L("*** FAIL: Failed to Create Mac Object - %d ***"), err);

		return EFail;

		}

	//Push the Mac Implementation Object onto the Cleanup Stack

	CleanupStack::PushL(macImpl);

	RFs fsSession;

	User::LeaveIfError(fsSession.Connect());

	CleanupClosePushL(fsSession);

	RFile sourceFile;

	CleanupClosePushL(sourceFile);

	//Open the specified source file

	User::LeaveIfError(sourceFile.Open(fsSession,sourcePath, EFileRead));

	TInt sourceLength = 0;

	TInt readPosition = 0;

	TInt readIncrement = 0;

	TBool macComplete = EFalse;

	TBool macReset = EFalse;

	TPtrC8 macStr;

	User::LeaveIfError(sourceFile.Size(sourceLength));

	//Divide the file size into seperate incremental blocks to read

	readIncrement = sourceLength/KDataReadBlocks;

	if (readIncrement == 0)

		{

		ERR_PRINTF2(_L("*** Error: Source File must be larger than %d bytes ***"), KDataReadBlocks);

		User::LeaveIfError(KErrNotSupported);

		}

	do

		{

		//Create a heap based descriptor to store the data

		HBufC8* sourceData = HBufC8::NewL(readIncrement);

		CleanupStack::PushL(sourceData);

		TPtr8 sourcePtr = sourceData->Des();

		//Read in a block of data from the source file from the current position

		err = sourceFile.Read(readPosition, sourcePtr, readIncrement);

		//Update the read position by adding the number of bytes read

		readPosition += readIncrement;

		if (readPosition == readIncrement)

			{

			//Read in the first block from the data file into the Mac implementation object

			macImpl->MacL(*sourceData);

			INFO_PRINTF2(_L("Intial Mac - Bytes Read: %d"), readPosition);

			}

		else if (readPosition >= sourceLength)

			{

			//Reading in the final block, constructs the complete hash value and returns it within a TPtrC8

			macStr.Set(macImpl->FinalL(*sourceData));

			//Sets the Complete Flag to ETrue in order to drop out of the loop

			macComplete = ETrue;

			TInt totalRead = (readPosition - readIncrement) + (*sourceData).Length();

			INFO_PRINTF2(_L("Final Mac - Bytes Read: %d"),totalRead);

			}

		//If the read position is half the source length and the implementation

		//object hasn't already been reset

		else if ((readPosition >= sourceLength/2) && (macReset	== EFalse))

			{

			INFO_PRINTF1(_L("Resetting Mac Object..."));

			macImpl->Reset();

			//Sets the read position back to 0 in order to restart the file read from the beginning

			readPosition = 0;

			macReset = ETrue;

			INFO_PRINTF2(_L("*** MAC RESET - Bytes Read: %d ***"), readPosition);

			}

		else

			{

			//Update the message data within the Mac object with the new block

			macImpl->UpdateL(*sourceData);

			INFO_PRINTF2(_L("Mac Update - Bytes Read: %d"), readPosition);

			}

		CleanupStack::PopAndDestroy(sourceData);

		} while (macComplete == EFalse);

	//Create a NULL TCharacteristics pointer

	const TCharacteristics* charsPtr(NULL);

	//Retrieve the characteristics for the mac implementation object

	TRAP_LOG(err, macImpl->GetCharacteristicsL(charsPtr));

	//Static cast the characteristics to type TMacCharacteristics

	const TMacCharacteristics* macCharsPtr = static_cast<const TMacCharacteristics*>(charsPtr);

	//The mac output size is returned in Bits, divide by 8 to get the Byte size

	 TInt macSize = macCharsPtr->iHashAlgorithmChar->iOutputSize/8;

	//Retrieve the final 8 bit Mac and convert to 16bit												

	HBufC* macData = HBufC::NewLC(macSize);

	TPtr macPtr = macData->Des();

	macPtr.Copy(macStr);

	//Take the 16 bit descriptor and convert the string to hexadecimal

	TVariantPtrC convertMac;

	convertMac.Set(macPtr);

	HBufC* macResult = convertMac.HexStringLC();

	INFO_PRINTF2(_L("*** Mac: %S ***"), &*macResult);

	INFO_PRINTF2(_L("*** Expected Mac: %S ***"), &expectedMac);

	//If the returned mac value matches the expected mac, Pass the test	

	if (*macResult == expectedMac)

		{

		INFO_PRINTF1(_L("*** Mac - Incremental with Reset : PASS ***"));

		SetTestStepResult(EPass);

		}

	else

		{

		ERR_PRINTF2(_L("*** FAIL: Generated Mac and Expected Mac Mismatch  ***"), err);

		}

	CleanupStack::PopAndDestroy(8, keyStr);	// keyStr, keyParams, key, macImpl, &fsSession, &sourceFile, macData, macResult

	INFO_PRINTF2(_L("HEAP CELLS: %d"), User::CountAllocCells());

	return TestStepResult();

	}

TVerdict CMacIncrementalResetStep::doTestStepPostambleL()

	{

	return TestStepResult();

	}