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os/security/cryptoservices/certificateandkeymgmt/pkcs7/pkcs7digestinfo.cpp
author sl@SLION-WIN7.fritz.box
Fri, 15 Jun 2012 03:10:57 +0200
changeset 0 bde4ae8d615e
permissions -rw-r--r--
First public contribution. 
     1 /*

     2 * Copyright (c) 2005-2009 Nokia Corporation and/or its subsidiary(-ies).

     3 * All rights reserved.

     4 * This component and the accompanying materials are made available

     5 * under the terms of the License "Eclipse Public License v1.0"

     6 * which accompanies this distribution, and is available

     7 * at the URL "http://www.eclipse.org/legal/epl-v10.html".

     8 *

     9 * Initial Contributors:

    10 * Nokia Corporation - initial contribution.

    11 *

    12 * Contributors:

    13 *

    14 * Description: 

    15 *

    16 */

    17 

    18  

    19 #include "pkcs7digestinfo.h"

    20 #include "pkcs7asn1.h"

    21 

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

    23 	{

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

    25 	CleanupStack::PushL(self);

    26 	self->ConstructL(aRawData);

    27 	CleanupStack::Pop(self);

    28 	return self;	

    29 	}

    30 	

    31 CPKCS7DigestInfo::~CPKCS7DigestInfo()

    32 	{

    33     }

    34 

    35 CPKCS7DigestInfo::CPKCS7DigestInfo()

    36 	{

    37 	}

    38 	

    39 EXPORT_C const TDesC8& CPKCS7DigestInfo::Digest() const

    40 	{

    41 	return iDigest;

    42 	}

    43 

    44 EXPORT_C TAlgorithmId CPKCS7DigestInfo::Algorithm() const

    45 	{

    46 	return iAlgorithmId;

    47 	}

    48 

    49 EXPORT_C const TPtrC8& CPKCS7DigestInfo::EncodedParams() const

    50 	{

    51 	return iEncodedParams;

    52 	}

    53 	

    54 void CPKCS7DigestInfo::ConstructL(const TDesC8& aDigestData)

    55 	{

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

    57 

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

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

    60 		{

    61 	    User::Leave(KErrArgument);

    62 		}

    63 

    64 	// DIGEST ALGORITHM

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

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

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

    68 		{

    69 		User::Leave(KErrArgument);

    70 		}

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

    72 	TAlgorithmId algorithmId = digestAlg->Algorithm();

    73 	switch(algorithmId)

    74 		{

    75 		case EMD2:

    76 			{

    77 			iAlgorithmId = EMD2;

    78 			}

    79 			break;

    80 		case EMD5:

    81 			{

    82 			iAlgorithmId = EMD5;

    83 			}

    84 			break;

    85 		case ESHA1:

    86 			{

    87 			iAlgorithmId = ESHA1;	

    88 			}

    89 			break;

    90 		default:

    91 			User::Leave(KErrNotSupported);

    92 		}

    93 	

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

    95 		

    96 	// DIGEST  

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

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

    99 		{

   100 		User::Leave(KErrArgument);

   101 		}

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

   103 	octetStringDecoder.InitL();

   104 	iDigest.Set(octetStringDecoder.GetContentDER());

   105 	

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

   107     }
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