/*

* 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 <bigint.h>

#include <asymmetric.h>

#include <hash.h>

#include <padding.h>

#include <keyidentifierutil.h>

#include <signed.h>

//RSA signature result

EXPORT_C TBool CRSASignatureResult::operator== (const CRSASignatureResult& aResult) const 

	{

	return ((*(iDigestAlgorithm) == *(aResult.iDigestAlgorithm)) &&

			(*(iDigest)==*(aResult.iDigest)));

	}

EXPORT_C CRSASignatureResult::~CRSASignatureResult()

	{

	delete iDigestAlgorithm;

	delete iDigest;

	}

//validity period

EXPORT_C CValidityPeriod::CValidityPeriod(const CValidityPeriod& aValidityPeriod)

	:iStart(aValidityPeriod.iStart), iFinish(aValidityPeriod.iFinish)

	{

	}

EXPORT_C CValidityPeriod::CValidityPeriod()

	{

	}

EXPORT_C TBool CValidityPeriod::Valid(const TTime& aTime) const

	{

	return ((iStart < aTime) && (iFinish > aTime));

	}

EXPORT_C const TTime& CValidityPeriod::Start() const

	{

	return iStart;

	}

EXPORT_C const TTime& CValidityPeriod::Finish() const

	{

	return iFinish;

	}

//******************************************************************************//

//algorithm id

EXPORT_C CAlgorithmIdentifier* CAlgorithmIdentifier::NewL(const CAlgorithmIdentifier& aAlgorithmIdentifier)

	{

	CAlgorithmIdentifier* self = CAlgorithmIdentifier::NewLC(aAlgorithmIdentifier);

	CleanupStack::Pop();//self

	return self;

	}

EXPORT_C CAlgorithmIdentifier* CAlgorithmIdentifier::NewLC(const CAlgorithmIdentifier& aAlgorithmIdentifier)

	{

	CAlgorithmIdentifier* self = new(ELeave) CAlgorithmIdentifier;

	CleanupStack::PushL(self);

	self->ConstructL(aAlgorithmIdentifier);

	return self;

	}

EXPORT_C CAlgorithmIdentifier* CAlgorithmIdentifier::NewL(TAlgorithmId& aAlgorithmId, const TDesC8& aEncodedParams)

	{

	CAlgorithmIdentifier* self = CAlgorithmIdentifier::NewLC(aAlgorithmId, aEncodedParams);

	CleanupStack::Pop();//self

	return self;

	}

EXPORT_C CAlgorithmIdentifier* CAlgorithmIdentifier::NewLC(TAlgorithmId& aAlgorithmId, const TDesC8& aEncodedParams)

	{

	CAlgorithmIdentifier* self = new(ELeave) CAlgorithmIdentifier(aAlgorithmId);

	CleanupStack::PushL(self);

	self->ConstructL(aEncodedParams);

	return self;

	}

EXPORT_C CAlgorithmIdentifier::CAlgorithmIdentifier(TAlgorithmId& aAlgorithmId)

	:iAlgorithmId(aAlgorithmId)

	{

	}

EXPORT_C CAlgorithmIdentifier::CAlgorithmIdentifier()

	{

	}

EXPORT_C void CAlgorithmIdentifier::ConstructL(const TDesC8& aEncodedParams)

	{

	iEncodedParams = aEncodedParams.AllocL();

	}

EXPORT_C TBool CAlgorithmIdentifier::operator==(const CAlgorithmIdentifier& aAlgorithmIdentifier) const 

	{

	return ((iAlgorithmId == aAlgorithmIdentifier.iAlgorithmId) &&

			(*(iEncodedParams) == *(aAlgorithmIdentifier.iEncodedParams)));

	}

EXPORT_C TAlgorithmId CAlgorithmIdentifier::Algorithm() const

	{

	return iAlgorithmId;

	}

EXPORT_C TPtrC8 CAlgorithmIdentifier::EncodedParams() const

	{

	return iEncodedParams->Des();

	}

EXPORT_C CAlgorithmIdentifier::~CAlgorithmIdentifier()

	{

	delete iEncodedParams;

	}

EXPORT_C void CAlgorithmIdentifier::ConstructL(const CAlgorithmIdentifier& aAlgorithmIdentifier)

	{

	iAlgorithmId = aAlgorithmIdentifier.iAlgorithmId;

	iEncodedParams = aAlgorithmIdentifier.iEncodedParams->AllocL();

	}

//***********************************************************************//

//signing algorithm id

EXPORT_C CSigningAlgorithmIdentifier* CSigningAlgorithmIdentifier::NewL(const CSigningAlgorithmIdentifier& aSigningAlgorithmIdentifier)

	{

	CSigningAlgorithmIdentifier* self = CSigningAlgorithmIdentifier::NewLC(aSigningAlgorithmIdentifier);

	CleanupStack::Pop();//self

	return self;

	}

EXPORT_C CSigningAlgorithmIdentifier* CSigningAlgorithmIdentifier::NewLC(const CSigningAlgorithmIdentifier& aSigningAlgorithmIdentifier)

	{

	CSigningAlgorithmIdentifier* self = new(ELeave) CSigningAlgorithmIdentifier;

	CleanupStack::PushL(self);

	self->ConstructL(aSigningAlgorithmIdentifier);

	return self;

	}

EXPORT_C TBool CSigningAlgorithmIdentifier::operator == (const CSigningAlgorithmIdentifier& aSigningAlgorithmIdentifier) const

	{

	return ((*(iAsymmetricAlgorithm) == *(aSigningAlgorithmIdentifier.iAsymmetricAlgorithm)) &&

			(*(iDigestAlgorithm) == *(aSigningAlgorithmIdentifier.iDigestAlgorithm)));

	}

void CSigningAlgorithmIdentifier::ConstructL(const CSigningAlgorithmIdentifier& aAlgorithmIdentifier)

	{

	iAsymmetricAlgorithm = CAlgorithmIdentifier::NewL(*(aAlgorithmIdentifier.iAsymmetricAlgorithm));

	iDigestAlgorithm = CAlgorithmIdentifier::NewL(*(aAlgorithmIdentifier.iDigestAlgorithm));

	}

EXPORT_C const CAlgorithmIdentifier& CSigningAlgorithmIdentifier::AsymmetricAlgorithm() const

	{

	return *iAsymmetricAlgorithm;

	}

EXPORT_C const CAlgorithmIdentifier& CSigningAlgorithmIdentifier::DigestAlgorithm() const

	{

	return *iDigestAlgorithm;

	}

EXPORT_C CSigningAlgorithmIdentifier::~CSigningAlgorithmIdentifier()

	{

	delete iAsymmetricAlgorithm;

	delete iDigestAlgorithm;

	}

//************************************************************************//

//subject public key info

EXPORT_C CSubjectPublicKeyInfo* CSubjectPublicKeyInfo::NewL(const CSubjectPublicKeyInfo& aSubjectPublicKeyInfo)

	{

	CSubjectPublicKeyInfo* self = CSubjectPublicKeyInfo::NewLC(aSubjectPublicKeyInfo);

	CleanupStack::Pop();//self

	return self;

	}

EXPORT_C CSubjectPublicKeyInfo* CSubjectPublicKeyInfo::NewLC(const CSubjectPublicKeyInfo& aSubjectPublicKeyInfo)

	{

	CSubjectPublicKeyInfo* self = new(ELeave) CSubjectPublicKeyInfo;

	CleanupStack::PushL(self);

	self->ConstructL(aSubjectPublicKeyInfo);

	return self;

	}

EXPORT_C TAlgorithmId CSubjectPublicKeyInfo::AlgorithmId() const

	{

	return iAlgId->Algorithm();

	}

EXPORT_C const TPtrC8 CSubjectPublicKeyInfo::EncodedParams() const

	{

	return iAlgId->EncodedParams();

	}

EXPORT_C const TPtrC8 CSubjectPublicKeyInfo::KeyData() const

	{

	return iEncodedKeyData->Des();

	}

EXPORT_C CSubjectPublicKeyInfo::~CSubjectPublicKeyInfo()

	{

	delete iAlgId;

	delete iEncodedKeyData;

	}

EXPORT_C void CSubjectPublicKeyInfo::ConstructL(const CSubjectPublicKeyInfo& aSubjectPublicKeyInfo)

	{

	iAlgId = CAlgorithmIdentifier::NewL(*(aSubjectPublicKeyInfo.iAlgId));

	iEncodedKeyData = aSubjectPublicKeyInfo.iEncodedKeyData->AllocL();

	}

//******************************************************************//

//signed object parameters

	//ctors

EXPORT_C CSigningKeyParameters* CSigningKeyParameters::NewL()

	{

	CSigningKeyParameters* self = new(ELeave) CSigningKeyParameters;

	return self;

	}

EXPORT_C CSigningKeyParameters* CSigningKeyParameters::NewLC()

	{

	CSigningKeyParameters* self = CSigningKeyParameters::NewL();

	CleanupStack::PushL(self);

	return self;

	}

	//copy ctors

EXPORT_C CSigningKeyParameters* CSigningKeyParameters::NewL(const CSigningKeyParameters& aParameters)

	{

	CSigningKeyParameters* self = CSigningKeyParameters::NewLC(aParameters);

	CleanupStack::Pop();

	return self;

	}

EXPORT_C CSigningKeyParameters* CSigningKeyParameters::NewLC(const CSigningKeyParameters& aParameters)

	{

	CSigningKeyParameters* self = new(ELeave) CSigningKeyParameters;

	CleanupStack::PushL(self);

	self->ConstructL(aParameters);

	return self;

	}

void CSigningKeyParameters::ConstructL(const CSigningKeyParameters& aParameters)

	{

	SetDSAParamsL(*(aParameters.iDSAParams));

	}

	//dtor

EXPORT_C CSigningKeyParameters::~CSigningKeyParameters()

	{

	delete iDSAParams;

	}

EXPORT_C void CSigningKeyParameters::SetDSAParamsL(const CDSAParameters& aParams)

	{

	delete iDSAParams;

	iDSAParams = NULL;	//	In case the next fails

//	Copy the TIntegers

	RInteger p = RInteger::NewL(aParams.P());

	CleanupStack::PushL(p);

	RInteger q = RInteger::NewL(aParams.Q());

	CleanupStack::PushL(q);

	RInteger g = RInteger::NewL(aParams.G());

	CleanupStack::PushL(g);

	iDSAParams = CDSAParameters::NewL(p, q, g);

	CleanupStack::Pop(3, &p);

	}

const CDSAParameters* CSigningKeyParameters::DSAParams() const

	{

	return iDSAParams;

	}

CSigningKeyParameters::CSigningKeyParameters()

	{

	}

//******************************************************************//

//signed object

EXPORT_C TBool CSignedObject::VerifySignatureL(const TDesC8& aEncodedKey) const

	{

	const CAlgorithmIdentifier& algId = iSigningAlgorithm->AsymmetricAlgorithm();

	const CAlgorithmIdentifier& digestId = iSigningAlgorithm->DigestAlgorithm();

	TBool verifyResult = EFalse;

	if (algId.Algorithm() == EDSA)

		{

		if (digestId.Algorithm() != ESHA1)

			{

			User::Leave(KErrArgument);

			}

		CSHA1* sha1 = CSHA1::NewL();

		CleanupStack::PushL(sha1);

		TPtrC8 signedData = SignedDataL();

		TPtrC8 hash = sha1->Final(signedData);

		verifyResult=VerifySignatureL(aEncodedKey, hash);

		CleanupStack::PopAndDestroy(sha1);//hash

		}

	else

		{

		TRAPD(result, verifyResult = VerifyRSASignatureL(aEncodedKey));

		if (result==KErrNoMemory)	//	Leave if OOM, anything else is a verify

			User::Leave(result);	//	error => verifyResult = EFalse

		}

	return verifyResult;

	}

EXPORT_C TBool CSignedObject::VerifySignatureL(const TDesC8& aEncodedKey, const TDesC8& aHash) const

	{

	const CAlgorithmIdentifier& algId = iSigningAlgorithm->AsymmetricAlgorithm();

	const CAlgorithmIdentifier& digestId = iSigningAlgorithm->DigestAlgorithm();

	TBool verifyResult = EFalse;

	if (algId.Algorithm() == EDSA)

		{

		if (digestId.Algorithm() != ESHA1)

			{

			User::Leave(KErrArgument);

			}

		CDSAPublicKey* key = NULL;

		if (algId.EncodedParams().Length() != 0)

			{

			key = iKeyFactory->DSAPublicKeyL(algId.EncodedParams(), aEncodedKey);

			}

		else

			{

			if (iParameters != NULL)

				{

				const CDSAParameters* params = iParameters->DSAParams();

				if (!params)

					{					

					User::Leave(KErrArgument);//no params

					}

				else

					{

					key = iKeyFactory->DSAPublicKeyL(*params, aEncodedKey);

					}

				}

			}

		if (key == NULL)

			{

			User::Leave(KErrArgument);

			}

		CleanupStack::PushL(key);

		CDSAVerifier* verifier = CDSAVerifier::NewLC(*key);

		CDSASignature* sig = iKeyFactory->DSASignatureL(Signature());

		CleanupStack::PushL(sig);

		verifyResult = verifier->VerifyL(aHash, *sig);

		CleanupStack::PopAndDestroy(3);//	key, verifier, sig

		}

	else

		{

		TRAPD(result, verifyResult = VerifyRSASignatureL(aEncodedKey, aHash));

		if (result==KErrNoMemory)	//	Leave if OOM, anything else is a verify

			User::Leave(result);	//	error => verifyResult = EFalse

		}

	return verifyResult;

	}

TBool CSignedObject::VerifyRSASignatureL(const TDesC8& aEncodedKey, const TDesC8& aHash) const

	{

	__UHEAP_MARK;

	const CAlgorithmIdentifier& algId = iSigningAlgorithm->AsymmetricAlgorithm();

	const CAlgorithmIdentifier& digestId = iSigningAlgorithm->DigestAlgorithm();

	if (algId.Algorithm() != ERSA)

		{

		User::Leave(KErrArgument);

		}

	//Get the public key	

	CRSAPublicKey* key = iKeyFactory->RSAPublicKeyL(aEncodedKey);

	CleanupStack::PushL(key);

	CRSAPKCS1v15Verifier* verifier = CRSAPKCS1v15Verifier::NewLC(*key);

	RInteger sig = RInteger::NewL(Signature());

	CleanupStack::PushL(sig);

	CRSASignature* theSignature = CRSASignature::NewL(sig);

	CleanupStack::Pop(&sig);

	CleanupStack::PushL(theSignature);

	HBufC8* publicDecryptOutput = verifier->InverseSignLC(*theSignature);

	//Now verify it

	TPtrC8 hash(aHash);

	CRSASignatureResult* decoder = iKeyFactory->RSASignatureResultL(digestId, hash);

	CleanupStack::PushL(decoder);

	TPtr8 outputPtr(publicDecryptOutput->Des());

	TBool verified = decoder->VerifyL(outputPtr);

	CleanupStack::PopAndDestroy(5, key);	//	decoder, publicDecryptOutput, theSignature

											//	verifier, key,

	__UHEAP_MARKEND;

	return (verified);		

	}

//	x509 signature comprises of an AlgID and the signed data itself, so a simple

//	verify is not possible (the data returned from public decrypt will not match

//	the original data signed because of the extra algID appendage).

//

TBool CSignedObject::VerifyRSASignatureL(const TDesC8& aEncodedKey) const

	{

	__UHEAP_MARK;

	const CAlgorithmIdentifier& algId = iSigningAlgorithm->AsymmetricAlgorithm();

	const CAlgorithmIdentifier& digestId = iSigningAlgorithm->DigestAlgorithm();

	if (algId.Algorithm() != ERSA)

		{

		User::Leave(KErrArgument);

		}	

	CMessageDigest* digest = NULL;

	switch(digestId.Algorithm())

		{

	case EMD2:

		{

		digest = CMD2::NewL();

		break;			

		}

	case EMD5:

		{

		digest = CMD5::NewL();

		break;

		}

	case ESHA1:

		{

		digest = CSHA1::NewL();

		break;

		}

	default:

		User::Leave(KErrArgument);

		}

	//Hash the data	

	CleanupStack::PushL(digest);

	TPtrC8 hash = digest->Final(SignedDataL());

	TBool verifyResult=VerifyRSASignatureL(aEncodedKey, hash);

	CleanupStack::PopAndDestroy(digest);

	__UHEAP_MARKEND;

	return verifyResult;

	}

EXPORT_C void CSignedObject::SetParametersL(const CSigningKeyParameters& aParameters)

	{

		delete iParameters;

		iParameters = NULL;	//	In case next fails

		iParameters = CSigningKeyParameters::NewL(aParameters);

	}