/**

 * Copyright (c) 2010 Sasken Communication Technologies Ltd.

 * All rights reserved.

 * This component and the accompanying materials are made available

 * under the terms of the "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:

 * Lasse Laasonen, Sasken Communication Technologies Ltd - Initial contribution

 *

 * Description:

 * This source contains routines handling RSA signing using Unified Key Store 

 */

#ifdef SYMBIAN_V3

#include <unifiedkeystore.h>

#include <asymmetric.h>

#include <mctkeystore.h>

#endif

#include <smfcredmgrclientdatastruct.h>

#include <smfcredmgrcommon.h>

#include <hash.h>

#include "smfkeystoremanager.h"

/**

 * NewL Method

 * @return The constructed CSmfKeyStoreManager instance

 */

CSmfKeyStoreManager* CSmfKeyStoreManager::NewL() {

	CSmfKeyStoreManager* self = CSmfKeyStoreManager::NewLC();

	CleanupStack::Pop( self );

	return self;

}

/**

 * NewLC Method

 * @return The constructed CSmfKeyStoreManager instance

 */

CSmfKeyStoreManager* CSmfKeyStoreManager::NewLC() {

	CSmfKeyStoreManager* self = new( ELeave )CSmfKeyStoreManager();

	CleanupStack::PushL( self );

	self->ConstructL();

	return self;

}

/**

 * Destructor

 */

CSmfKeyStoreManager::~CSmfKeyStoreManager() {

	iFs.Close();

	delete iSignParameters;

	iSignParameters = NULL;

	delete iRsaKeyParameters;

	iRsaKeyParameters = NULL;

}

/**

 * HandleMessageL

 * @param aMessage

 */

void CSmfKeyStoreManager::HandleMessageL( const RMessage2& aMessage ) 

	{

	RDebug::Printf("SMF: CSmfKeyStoreManager::HandleMessageL");

	iMessages.AppendL( &aMessage );

	if ( !IsActive() ) 

		{

		ContinueMessageHandlingL();

		}

	}

/**

 * RunL

 */

void CSmfKeyStoreManager::RunL() 

	{

	RDebug::Printf("SMF: CSmfKeyStoreManager::RunL, iStatus=%d", iStatus.Int() );

	switch( iState )

		{

		case EInitializingKeystore:

			{

			SetPassphraseTimeout();

			break;			

			}

		case ESettingPassphraseTimeout:

			{

			RDebug::Printf("SMF: Key store manager initialized");

			iState = EInitialized;

			break;

			}		

#ifdef SYMBIAN_V3

		case EGeneratingKey:

			{

			iState = EInitialized;

			RDebug::Printf("SMF: Completing generate key message");			

			iMessages[0]->Complete( iStatus.Int() );

			iMessages.Remove(0);

			break;

			}

		case EImportingKey:

			{

			iState = EInitialized;

			TInt num = iStatus.Int();

			if( iStatus.Int() == KErrNone ) 

				{

				iMessages[0]->WriteL( 1, iImportedKey->ID() );

				}

			RDebug::Printf("SMF: Completing import key message");

			iMessages[0]->Complete( iStatus.Int() );

			iMessages.Remove(0);

			break;

			}

		case EGettingKeyList:

		case EGettingRSASigner:

			{

			RSA_SHA1_SignMessageL();

			return;

			}

		case ERSASigningMessage:

			{

			iState = EInitialized;

			if ( iStatus.Int() == KErrNone ) 

				{

				HBufC8* signature = iRSASignature->S().BufferLC();

				RDebug::Printf("SMF: Signed message=%S", signature);			

				iMessages[0]->WriteL(1, *signature);			

				CleanupStack::PopAndDestroy();

				}

			iMessages[0]->Complete( iStatus.Int() );

			iMessages.Remove(0);

			break;

			}

		case EListingKeys:

			{

			iState = EInitialized;

			RDebug::Printf("Key count: %d", iKeys.Count() );

			for (TInt i = 0; i < iKeys.Count(); i++)

				{

				CCTKeyInfo* info = iKeys[i];

				RDebug::Printf("key label: %S", &info->Label());

				}

			iMessages[0]->Complete( iStatus.Int() );

			iMessages.Remove(0);

			break;

			}

		case EKeyDeleted:

			{

			iState = EInitialized;

			iMessages[0]->Complete(iStatus.Int());

			iMessages.Remove( 0 );

			break;

			}

		case EDeletingKey:

			{

			DeleteKeysL();

			break;

			}

#endif

		default:

			{

			break;

			}

		}

	if ( iMessages.Count() )

		{

		ContinueMessageHandlingL();

		}	

	}

/**

 * DoCancel

 */

void CSmfKeyStoreManager::DoCancel() {	

}

/**

 * RunError

 * @param aError

 * @return

 */

TInt CSmfKeyStoreManager::RunError( TInt aError ) {

	RDebug::Printf("SMF: CSmfKeyStoreManager::RunError error=%d", aError);

	if ( iMessages.Count() ) 

		{

		iMessages[0]->Complete( aError );

		iMessages.Remove( 0 );

		}

	return KErrNone;

}

/**

 * Constructor

 */

CSmfKeyStoreManager::CSmfKeyStoreManager() 

	:CActive(EPriorityStandard), iState(EInitializingKeystore) 

	{

	}

/**

 * Two-phase constructor

 */

void CSmfKeyStoreManager::ConstructL() {

	RDebug::Printf("SMF: CSmfKeyStoreManager::ConstructL");

	CActiveScheduler::Add( this );

#ifdef	SYMBIAN_V3

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

	iKeyStore = CUnifiedKeyStore::NewL(iFs);

	iKeyStore->Initialize( iStatus );

	iState = EInitializingKeystore;

	SetActive();	

#endif

}

/**

 * ContinueMessageHandlingL

 */

void CSmfKeyStoreManager::ContinueMessageHandlingL() 

	{

	RDebug::Printf("SMF: CSmfKeyStoreManager::ContinueMessageHandling");

	if ( IsActive() )

		{

		return;

		}

	RMessage2* message = iMessages[0];

	TInt function = message->Function();

	switch( function ) 

		{

		case ESmfStoreRSAKey:

			{

			StoreRSAKeyL();

			break;

			}

		case ESmfRSASignMessage:

			{

			RSA_SHA1_SignMessageL();

			break;

			}

		case ESmfHMACSHA1SignMessage:

			{

			HMAC_SHA1_SignMessageL();

			break;

			}

		case ESmfDeleteKeys:

			{

			DeleteKeysL();

			break;

			}

		}

	}

/**

 * StoreRSAKeyL

 */

void CSmfKeyStoreManager::StoreRSAKeyL() 

	{

#ifdef SYMBIAN_V3

	RDebug::Printf("SMF: CSmfKeyStoreManager::StoreRSAKeyL");

	ReadRsaKeyParametersL();

	RDebug::Printf("SMF: Parameters read");

	iKeyStore->ImportKey(

			0, iRsaKeyParameters->KeyData(), EPKCS15UsageSign, iRsaKeyParameters->KeyName(),

			CCTKeyInfo::EExtractable, iRsaKeyParameters->StartDate(), iRsaKeyParameters->EndDate(),

			iImportedKey, iStatus );

	SetActive();

	iState = EImportingKey;

#endif

	}

/**

 * RSA_SHA1_SignMessageL

 */

void CSmfKeyStoreManager::RSA_SHA1_SignMessageL() 

	{

	RDebug::Printf("SMF: CSmfKeyStoreManager::RSA_SHA1_SignMessage");

#ifdef SYMBIAN_V3

	switch( iState ) 

		{

		case EInitialized:

			{

			// Get the key

			ReadSignParametersL(); 

			TCTKeyAttributeFilter filter;

			filter.iKeyAlgorithm = CCTKeyInfo::ERSA;

			iKeyStore->List( iKeys, filter, iStatus );

			iState = EGettingKeyList;

			SetActive();

			break;

			}

		case EGettingKeyList:

			{

			RDebug::Printf("SMF: key count=%d", iKeys.Count());

			// Find the correct key

			bool keyFound = EFalse;

			for( TInt i = 0; i < iKeys.Count(); i++ ) 

				{

				if ( iKeys[i]->ID() == iSignParameters->Key() ) 

					{

					RDebug::Printf("SMF: Correct key found");

					//might panic in CodeScanner, this open returns void

					iKeyStore->Open( *iKeys[i], iRSASigner, iStatus );

					iState = EGettingRSASigner;

					keyFound = ETrue;

					SetActive();

					break;						

					}

				}

			if ( !keyFound ) 

				{

				iMessages[0]->Complete( KErrNotFound );

				iMessages.Remove( 0 );

				}

			break;

			}

		case EGettingRSASigner:

			{

			ASSERT( iRSASigner != NULL );

			iRSASigner->SignMessage(iSignParameters->Message(), iRSASignature, iStatus);

			iState = ERSASigningMessage;

			SetActive();

			break;

			}

		default:

			{

			break;

			}

		}	

#endif

	}

/**

 * HMAC_SHA1_SignMessageL

 */

void CSmfKeyStoreManager::HMAC_SHA1_SignMessageL()

	{	

	ReadSignParametersL();

	RDebug::Printf("SMF: CSmfKeyStoreManager::HMAC_SHA1_SignMessage");

	CSHA1* sha = CSHA1::NewL();

	CHMAC* hmac = CHMAC::NewL( iSignParameters->Key(), sha );

	TPtrC8 hashedSig( hmac->Hash( iSignParameters->Message() ) );

	RDebug::Printf("SMF: hashed message length=%d", hashedSig.Length());

	RDebug::Printf("SMF: hashed message=%S", &hashedSig);

	iMessages[0]->WriteL( 1, hashedSig );

	RDebug::Printf("SMF: result written");

	iMessages[0]->Complete( KErrNone );

	iMessages.Remove(0);

	RDebug::Printf("SMF: message completed");

	delete iSignParameters;

	iSignParameters = NULL;	

	}

/**

 * DeleteKeysL

 */

void CSmfKeyStoreManager::DeleteKeysL() 

	{

	RDebug::Printf("SMF: CSmfKeyStoreManager::DeleteKeys");

#ifdef SYMBIAN_V3

	switch ( iState ) 

		{

		case EInitialized:

			{

			iKeys.Reset();

			TCTKeyAttributeFilter filter;

			filter.iKeyAlgorithm = CCTKeyInfo::ERSA;

			iKeyStore->List( iKeys, filter, iStatus );

			iState = EDeletingKey;

			SetActive();

			break;

			}

		case EDeletingKey:

			{

			RDebug::Printf("SMF: key count=%d", iKeys.Count());

			//read the key-label to delete from message

			HBufC* KeyBuf = HBufC::NewL(KMaxSignedMsgLength);

			TPtr keyPtr(KeyBuf->Des());

			iMessages[0]->Read(0, keyPtr);

			// Find the correct key

			bool keyFound = EFalse;

			for (TInt i = 0; i < iKeys.Count(); i++)

				{

				if (iKeys[i]->ID() == (keyPtr.Collapse()))

					{

					RDebug::Printf("SMF: Correct key found");

					iKeyStore->DeleteKey(*iKeys[i], iStatus);

					keyFound = ETrue;

					iState = EKeyDeleted;

					SetActive();

					}

				}

			if (!keyFound)

				{

				iMessages[0]->Complete(KErrNotFound);

				iMessages.Remove( 0 );

				}

			break;

			}

		}

#endif

	}

/**

 * SetPassphraseTimeout

 */

void CSmfKeyStoreManager::SetPassphraseTimeout() 

	{

#ifdef SYMBIAN_V3

	iKeyStore->SetPassphraseTimeout( -1, iStatus );

	iState = ESettingPassphraseTimeout;

	SetActive();

#endif

	}

/**

 * ReadSignParametersL

 */

void CSmfKeyStoreManager::ReadSignParametersL()

	{

	RMessage2* message = iMessages[0];

	RBuf8 dataBuf;

	CleanupClosePushL( dataBuf );

	dataBuf.CreateL( message->GetDesLength( 0 ) );

	message->ReadL( 0, dataBuf, 0 );

	delete iSignParameters;

	iSignParameters = NULL;

	iSignParameters = CSmfSignParameters::NewL( dataBuf );

	CleanupStack::PopAndDestroy( &dataBuf );

	}

/**

 * ReadRsaKeyParametersL

 */

void CSmfKeyStoreManager::ReadRsaKeyParametersL()

	{

	RMessage2* message = iMessages[0];

	RBuf8 dataBuf;

	CleanupClosePushL( dataBuf );

	dataBuf.CreateL( message->GetDesLength( 0 ) );

	message->ReadL( 0, dataBuf, 0 );

	delete iRsaKeyParameters;

	iRsaKeyParameters = NULL;

	iRsaKeyParameters = CSmfRsaKeyParameters::NewL( dataBuf );

	CleanupStack::PopAndDestroy( &dataBuf );

	}