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/*
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* Copyright (c) 1998-2009 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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* This file contains the object implementing the Bitstring ASN1 object.
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* There is no handling for constructed form of Bitstring right now.
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*
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*/
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#include "asn1dec.h"
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EXPORT_C TASN1DecBitString::TASN1DecBitString(void)
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{
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}
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EXPORT_C HBufC8* TASN1DecBitString::DecodeDERL(const TDesC8& /*aSource*/,TInt& /*aPos*/)
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{
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User::Leave(KErrNotSupported);
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return NULL;
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}
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EXPORT_C HBufC8* TASN1DecBitString::DecodeDERL(const TASN1DecGeneric& /*aSource*/)
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{
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User::Leave(KErrNotSupported);
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return NULL;
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}
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EXPORT_C HBufC8* TASN1DecBitString::ExtractOctetStringL(const TDesC8& aSource,TInt& aPos)
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{
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TASN1DecGeneric gen(aSource.Right(aSource.Length() - aPos));
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gen.InitL();
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HBufC8* res = ExtractOctetStringL(gen);
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aPos+=gen.LengthDER();
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return res;
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}
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EXPORT_C HBufC8* TASN1DecBitString::ExtractOctetStringL(const TASN1DecGeneric& aSource)
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{
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TPtrC8 encoding = aSource.GetContentDER();
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// Special case. The empty bit string. (No padding length octet)
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if (encoding.Length() == 0 )
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{
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return encoding.AllocL();
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}
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// Length must either be 0 for the empty string or >= 2 because
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// of the padding length octet.
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if (encoding.Length() == 1)
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{
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User::Leave(KErrArgument);
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}
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TUint8 paddingLength = encoding[0];
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if (paddingLength > 7)
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{
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User::Leave(KErrArgument);
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}
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TPtrC8 pEncoding = encoding.Right(encoding.Length()-1);
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HBufC8* octetStr = pEncoding.AllocL();
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TPtr8 pEncKey = octetStr->Des();
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//stop stupid compiler warning
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TUint8 mask =(TUint8)(255 << paddingLength);
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//stop stupid compiler warning
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pEncKey[pEncKey.Length()-1] = (TUint8) ((pEncKey[pEncKey.Length()-1]) & mask);
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return octetStr;
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}
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