cryptoservices/certificateandkeymgmt/pkcs7/pkcs7digestinfo.cpp
author andy simpson <andrews@symbian.org>
Sat, 05 Dec 2009 21:41:51 +0000
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permissions -rw-r--r--
merge 200948 drop
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/*
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* Copyright (c) 2005-2009 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of the License "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description: 
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*
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*/
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#include "pkcs7digestinfo.h"
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#include "pkcs7asn1.h"
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EXPORT_C CPKCS7DigestInfo* CPKCS7DigestInfo::NewL(const TDesC8& aRawData)
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	{
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	CPKCS7DigestInfo* self = new (ELeave) CPKCS7DigestInfo();
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	CleanupStack::PushL(self);
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	self->ConstructL(aRawData);
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	CleanupStack::Pop(self);
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	return self;	
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	}
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CPKCS7DigestInfo::~CPKCS7DigestInfo()
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	{
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    }
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CPKCS7DigestInfo::CPKCS7DigestInfo()
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	{
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	}
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EXPORT_C const TDesC8& CPKCS7DigestInfo::Digest() const
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	{
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	return iDigest;
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	}
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EXPORT_C TAlgorithmId CPKCS7DigestInfo::Algorithm() const
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	{
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	return iAlgorithmId;
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	}
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EXPORT_C const TPtrC8& CPKCS7DigestInfo::EncodedParams() const
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	{
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	return iEncodedParams;
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	}
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void CPKCS7DigestInfo::ConstructL(const TDesC8& aDigestData)
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	{
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    CArrayPtr<TASN1DecGeneric>* digestInfo = PKCS7ASN1::DecodeSequenceLC(aDigestData);
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	// Check if both the digestAlgorithm and the Digest are present.
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	if ( digestInfo->Count() != 2 )
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		{
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	    User::Leave(KErrArgument);
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		}
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	// DIGEST ALGORITHM
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	// Get the algorithm identifier and the encoded parameters present in the sequence.
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	const TASN1DecGeneric* digestInfoAt0 = digestInfo->At(0);
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	if(digestInfoAt0->Tag() != EASN1Sequence || digestInfoAt0->Class() != EUniversal)
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		{
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		User::Leave(KErrArgument);
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		}
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	CX509AlgorithmIdentifier* digestAlg = CX509AlgorithmIdentifier::NewLC(digestInfo->At(0)->Encoding());
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	TAlgorithmId algorithmId = digestAlg->Algorithm();
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	switch(algorithmId)
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		{
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		case EMD2:
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			{
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			iAlgorithmId = EMD2;
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			}
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			break;
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		case EMD5:
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			{
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			iAlgorithmId = EMD5;
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			}
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			break;
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		case ESHA1:
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			{
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			iAlgorithmId = ESHA1;	
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			}
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			break;
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		default:
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			User::Leave(KErrNotSupported);
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		}
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	iEncodedParams.Set(digestAlg->EncodedParams()); 
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	// DIGEST  
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	const TASN1DecGeneric* digestInfoAt1 = digestInfo->At(1);
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	if(digestInfoAt1->Tag() != EASN1OctetString || digestInfoAt1->Class() != EUniversal)
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		{
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		User::Leave(KErrArgument);
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		}
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	TASN1DecGeneric octetStringDecoder(*(digestInfo->At(1)));
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	octetStringDecoder.InitL();
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	iDigest.Set(octetStringDecoder.GetContentDER());
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	CleanupStack::PopAndDestroy(2,digestInfo);// digestInfo, digestAlg
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    }