/*

* Copyright (c) 2005-2009 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 "pkcs7digestinfo.h"

#include "pkcs7asn1.h"

EXPORT_C CPKCS7DigestInfo* CPKCS7DigestInfo::NewL(const TDesC8& aRawData)

	{

	CPKCS7DigestInfo* self = new (ELeave) CPKCS7DigestInfo();

	CleanupStack::PushL(self);

	self->ConstructL(aRawData);

	CleanupStack::Pop(self);

	return self;	

	}

CPKCS7DigestInfo::~CPKCS7DigestInfo()

	{

    }

CPKCS7DigestInfo::CPKCS7DigestInfo()

	{

	}

EXPORT_C const TDesC8& CPKCS7DigestInfo::Digest() const

	{

	return iDigest;

	}

EXPORT_C TAlgorithmId CPKCS7DigestInfo::Algorithm() const

	{

	return iAlgorithmId;

	}

EXPORT_C const TPtrC8& CPKCS7DigestInfo::EncodedParams() const

	{

	return iEncodedParams;

	}

void CPKCS7DigestInfo::ConstructL(const TDesC8& aDigestData)

	{

    CArrayPtr<TASN1DecGeneric>* digestInfo = PKCS7ASN1::DecodeSequenceLC(aDigestData);

	// Check if both the digestAlgorithm and the Digest are present.

	if ( digestInfo->Count() != 2 )

		{

	    User::Leave(KErrArgument);

		}

	// DIGEST ALGORITHM

	// Get the algorithm identifier and the encoded parameters present in the sequence.

	const TASN1DecGeneric* digestInfoAt0 = digestInfo->At(0);

	if(digestInfoAt0->Tag() != EASN1Sequence || digestInfoAt0->Class() != EUniversal)

		{

		User::Leave(KErrArgument);

		}

	CX509AlgorithmIdentifier* digestAlg = CX509AlgorithmIdentifier::NewLC(digestInfo->At(0)->Encoding());

	TAlgorithmId algorithmId = digestAlg->Algorithm();

	switch(algorithmId)

		{

		case EMD2:

			{

			iAlgorithmId = EMD2;

			}

			break;

		case EMD5:

			{

			iAlgorithmId = EMD5;

			}

			break;

		case ESHA1:

			{

			iAlgorithmId = ESHA1;	

			}

			break;

		default:

			User::Leave(KErrNotSupported);

		}

	iEncodedParams.Set(digestAlg->EncodedParams()); 

	// DIGEST  

	const TASN1DecGeneric* digestInfoAt1 = digestInfo->At(1);

	if(digestInfoAt1->Tag() != EASN1OctetString || digestInfoAt1->Class() != EUniversal)

		{

		User::Leave(KErrArgument);

		}

	TASN1DecGeneric octetStringDecoder(*(digestInfo->At(1)));

	octetStringDecoder.InitL();

	iDigest.Set(octetStringDecoder.GetContentDER());

	CleanupStack::PopAndDestroy(2,digestInfo);// digestInfo, digestAlg

    }