/*
* Copyright (c) 2008-2010 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: 
* Example CTestStep derived implementation
*
*/


/**
 @file
 @internalTechnology
*/
#include "mac_incremental_with_copy_step.h"
#include <cryptospi/cryptomacapi.h>
#include <cryptospi/keys.h>
#include <cryptospi/plugincharacteristics.h>

using namespace CryptoSpi;

CMacIncrementalWithCopyStep::~CMacIncrementalWithCopyStep()
	{
	}


CMacIncrementalWithCopyStep::CMacIncrementalWithCopyStep()
	{
	SetTestStepName(KMacIncrementalWithCopyStep);
	}


TVerdict CMacIncrementalWithCopyStep::doTestStepPreambleL()
	{
	return EPass;
	}


TVerdict CMacIncrementalWithCopyStep::doTestStepL()
	{
	//Assume faliure, unless all is successful
	SetTestStepResult(EFail);
	
	INFO_PRINTF1(_L("*** Mac - Incremental with Copy ***"));
	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 Hmac 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 macCopied = EFalse;
	TPtrC8 macStr;
	CMac* macCopyImpl = NULL;
						
	User::LeaveIfError(sourceFile.Size(sourceLength));
						
	//Divide the total size of the source file up into individual equal sized blocks to read
	//over several increments
	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);
			CleanupStack::PopAndDestroy(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(macCopyImpl->FinalL(*sourceData));
			CleanupStack::PopAndDestroy(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 copied
		else if((readPosition >= sourceLength/2) && (macCopied == EFalse))
			{
			//Update the hash message before copying
			macImpl->UpdateL(*sourceData);
			CleanupStack::PopAndDestroy(sourceData);
			
			INFO_PRINTF1(_L("Copying Mac Object..."));
			
			//Create a Copy of the existing Mac Object and all internal state of the message digest
			macCopyImpl = macImpl->CopyL();
			
			macCopied = ETrue;
			CleanupStack::PushL(macCopyImpl);
			INFO_PRINTF2(_L("*** Mac COPY - Bytes Read: %d ***"), readPosition);
			}
		else
			{
			//Update the message data within the Mac object with the new block
			if(macCopied == EFalse)
				{
				macImpl->UpdateL(*sourceData);
				INFO_PRINTF2(_L("Mac Update - Bytes Read: %d"), readPosition);		
				}
			else
				{
				macCopyImpl->UpdateL(*sourceData);
				INFO_PRINTF2(_L("Mac Update (Copy) - 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 Copy : PASS ***"));
		SetTestStepResult(EPass);
		}
	else
		{
		ERR_PRINTF2(_L("*** FAIL: Generated Mac and Expected Mac Mismatch  ***"), err);
		}
		
	CleanupStack::PopAndDestroy(9, keyStr);	// keyStr, keyParams, key, macImpl, &fsSession, &sourceFile, macCopyImpl, macData, macResult
	INFO_PRINTF2(_L("HEAP CELLS: %d"), User::CountAllocCells());
	return TestStepResult();
	}


TVerdict CMacIncrementalWithCopyStep::doTestStepPostambleL()
	{
	return TestStepResult();
	}
