// Copyright (c) 2006-2009 Nokia Corporation and/or its subsidiary(-ies).

// All rights reserved.

// This component and the accompanying materials are made available

// under the terms of "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:

//

/**

 @file keyderivationstep.cpp

 @internalTechnology

*/

#include "keyderivationstep.h"

#include "psuedorandom.h"

#include <tlsprovinterface.h>

CKeyDerivationStep::CKeyDerivationStep()

	{

	SetTestStepName(KKeyDerivationStep);

	}

TVerdict CKeyDerivationStep::doTestStepPreambleL()

	{

	ConstructL();

	CTlsCryptoAttributes* atts = Provider()->Attributes();

	// Reads PSK values if included in INI file.

	ReadPskToBeUsedL();

	// Reads if NULL ciphers suites are to be allowed from INI file.

	ReadUseNullCipher();

	// read the "server" random

	HBufC8* random = ServerRandomL();

	atts->iMasterSecretInput.iServerRandom.Copy(*random);

	delete random;

	// and the client random

	random = ClientRandomL();

	atts->iMasterSecretInput.iClientRandom.Copy(*random);

	delete random;

	// we only support null compression...

	atts->iCompressionMethod = ENullCompression;

	// read the cipher suite for the test

	atts->iCurrentCipherSuite = CipherSuiteL();

	// read the protocol version

	TTLSProtocolVersion version = ProtocolVersionL();

	atts->iNegotiatedProtocol = version;

	atts->iProposedProtocol = version;

	// set the session ID and "server" name (localhost)

	atts->iSessionNameAndID.iSessionId = SessionId();

	atts->iSessionNameAndID.iServerName.iAddress = KLocalHost; 

	atts->iSessionNameAndID.iServerName.iPort = 443;

	atts->idomainName.Copy(DomainNameL());

	// try and read DH params, this section may not exist

	RInteger gen;

	CleanupClosePushL(gen);

	RInteger prime;

	CleanupClosePushL(prime);

	// If cipher suite under test is uses PSK (Pre Shared Key)

	if(UsePsk())

		{

		// Populates values for PSK 

		atts->iPskConfigured = true;

		atts->iPublicKeyParams->iKeyType = EPsk;

		atts->iPublicKeyParams->iValue4 = PskIdentity();

		atts->iPublicKeyParams->iValue5 = PskKey();

		}

	else 

		{

		// If cipher suite under test is NOT PSK 

		TRAPD(err, ReadDHParamsL());

		if (err == KErrNone)

			{

			atts->iPublicKeyParams->iKeyType = EDHE;

			// The params are:

			// 1 - Prime

			// 2 - Generator

			// 3 - generator ^ random mod prime

			atts->iPublicKeyParams->iValue1 = Prime().BufferLC();

			CleanupStack::Pop(atts->iPublicKeyParams->iValue1);

			atts->iPublicKeyParams->iValue2 = Generator().BufferLC();

			CleanupStack::Pop(atts->iPublicKeyParams->iValue2);

			atts->iPublicKeyParams->iValue3 = KeyPair()->PublicKey().X().BufferLC();

			CleanupStack::Pop(atts->iPublicKeyParams->iValue3);

			}

		}

	CleanupStack::PopAndDestroy(2, &gen); // prime

	// No client authentication or dialogs for this test, please

	atts->iClientAuthenticate = EFalse;

	atts->iDialogNonAttendedMode = ETrue;

	if(UseNullCipher())

		{

		// Enables null cipher by setting appropiate parameter  

		atts->iAllowNullCipherSuites = ETrue;

 		}

	return EPass;

	}

TVerdict CKeyDerivationStep::doTestStepL()

	{

	INFO_PRINTF1(_L("Calling TLS Provider to fetch cipher suites."));

	// first we have to retrieve the available cipher suites

	TInt err = GetCipherSuitesL();

	if (err != KErrNone)

		{

		INFO_PRINTF2(_L("Failed! Cannot retrieve supported cipher suites! (Error %d)"),

			err);

		SetTestStepResult(EFail);

		return TestStepResult();

		}

	// verifies certificate if is not a PSK cipher suite

  	if( !UsePsk() )

		{

			// we have to verify the server certificate, to supply the certificate

		// and its parameters to the TLS provider.

		INFO_PRINTF1(_L("Calling TLS Provider to verify server certificate."));

		CX509Certificate* cert = NULL;

		err = VerifyServerCertificateL(cert);

		delete cert;

			// make sure it completed sucessfully.

		if (err != KErrNone)

			{

			INFO_PRINTF2(_L("Failed! Server Certificate did not verify correctly! (Error %d)"),

				err);

			SetTestStepResult(EFail);

			return TestStepResult();

			}

		}   

	INFO_PRINTF1(_L("Creating TLS Session."));	

	// now, create a session with the parameters set in the preamble

	err = CreateSessionL();

	// ensure we succeeded

	if (err != KErrNone)

		{

		INFO_PRINTF2(_L("Failed! Create Session failed! (Error %d)"), err);

		SetTestStepResult(EFail);

		return TestStepResult();

		}

	INFO_PRINTF1(_L("Calling TLS session key exchange."));

	HBufC8* keyExMessage = NULL;

	err = ClientKeyExchange(keyExMessage);

	if (err != KErrNone)

		{

		INFO_PRINTF2(_L("Failed! Key exchange failed! (Error %d)"), err);

		delete keyExMessage;

		SetTestStepResult(EFail);

		return TestStepResult();

		}

	INFO_PRINTF1(_L("Deriving premaster secret."));

	// derive the premaster secret from the key exchange method	

	CleanupStack::PushL(keyExMessage);

	HBufC8* premaster = DerivePreMasterSecretL(*keyExMessage);

	CleanupStack::PopAndDestroy(keyExMessage);

	INFO_PRINTF1(_L("Deriving master secret."));

	// compute the master secret from the premaster.

	CleanupStack::PushL(premaster);

	HBufC8* master = ComputeMasterSecretL(*premaster);

	CleanupStack::PopAndDestroy(premaster);

	CleanupStack::PushL(master);

	// now generate what we think the derived EAP key block should look like.

	TBuf8<192> ourEAP;

	CTlsCryptoAttributes* atts = Provider()->Attributes();

	TBuf8<64> random;

	random.Append(atts->iMasterSecretInput.iClientRandom);

	random.Append(atts->iMasterSecretInput.iServerRandom);

	// make sure we're using TLS. This step makes no sense for SSL 3.0

	if (atts->iNegotiatedProtocol.iMajor == 3 && atts->iNegotiatedProtocol.iMinor == 0)

		{

		INFO_PRINTF1(_L("Error! Cannot use this test step with SSLv3!"));

		User::Leave(KErrNotSupported);

		}

	INFO_PRINTF1(_L("Computing our derived EAP-TLS key."));

	// compute the 128 byte block that uses the master secret as key.

	_LIT8(KEAPEncryptionLabel, "client EAP encryption");

	HBufC8* block1 = CTls10PsuedoRandom::PseudoRandomL(*master, KEAPEncryptionLabel, random, 128);

	ourEAP.Append(*block1);

	delete block1;

	// compute the 64 byte IV block

	HBufC8* block2 = CTls10PsuedoRandom::PseudoRandomL(KNullDesC8, KEAPEncryptionLabel, random, 64);

	ourEAP.Append(*block2);

	delete block2;

	INFO_PRINTF1(_L("Calling TLS Session key derivation."));

	// get the TLS provider's idea of what the EAP keyblock should be, and check they match.

	TBuf8<192> theirEAP;

	User::LeaveIfError(Session()->KeyDerivation(KEAPEncryptionLabel, atts->iMasterSecretInput, theirEAP));

	if (ourEAP == theirEAP)

		{

		INFO_PRINTF1(_L("Test passed."));

		SetTestStepResult(EPass);

		}

	else

		{

		INFO_PRINTF1(_L("Failed! EAP-TLS is corrupt!"));	

		SetTestStepResult(EFail);

		}

	CleanupStack::PopAndDestroy(master);

	return TestStepResult();

	}