cryptoservices/certificateandkeymgmt/asn1/genericdec.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Thu, 10 Sep 2009 14:01:51 +0300
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parent 0 2c201484c85f
permissions -rw-r--r--
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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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*
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*/
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#include "asn1dec.h"
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EXPORT_C TASN1DecGeneric::TASN1DecGeneric(const TDesC8& aSource):
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 iEncoding(aSource)
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	{
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	}
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EXPORT_C void TASN1DecGeneric::InitL()
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// x209 6.2, 6.3
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	{
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	if(iEncoding.Length() < KASN1ObjectMinLength)
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		{
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		User::Leave(KErrArgument);
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		}	
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	TInt i=iEncoding[0];
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	TInt b=i>>6;
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	iClass=(TASN1Class)b;
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	TInt Length=0;
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	TInt LengthOfLength=1;
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	TInt Pos=0;
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	TInt T=0;
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	TInt encodingLength = iEncoding.Length();
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	// work out tag 
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	if ((iEncoding[Pos]&0x1f)==0x1f)
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		{
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		// tag greater than 30
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		Pos++;
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		if (encodingLength <= Pos+1)
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			{
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			User::Leave(KErrArgument);
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			}
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		while (iEncoding[Pos]>=128)
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			{
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			T<<=7;
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			T+=(TUint8)(iEncoding[Pos]&127);		// this raises warning if TTagType is TUint8
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			Pos++;
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			if (encodingLength <= Pos+1)
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				{
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				User::Leave(KErrArgument);
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				}
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			}
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		T<<=7;
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		T+=(TUint8)iEncoding[Pos];
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		}
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	else
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		{
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		T=(TUint8)(iEncoding[Pos]&0x1f);
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		}
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	iExplicitTag = T;
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	Pos++;
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	TUint8 l = iEncoding[Pos];
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	if (l > 128)
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		{
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		// this is a length of length
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		if (encodingLength <= Pos+1)
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			{
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			User::Leave(KErrArgument);
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			}
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		LengthOfLength=iEncoding[Pos++]&127;
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		Length=0;
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		while (LengthOfLength)
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			{
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			if (encodingLength <= Pos+1)
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				{
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				User::Leave(KErrArgument);
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				}
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			Length<<=8;
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			Length+=iEncoding[Pos++];
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			LengthOfLength--;
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			}
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		}
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	if (l == 128)
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		{
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		//this is constructed, indefinite length: we don't support this
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		User::Leave(KErrNotSupported);
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		}
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	if (l < 128)
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		{
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		//this is a straight length
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		Length = iEncoding[Pos++];
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		}
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	if (((Length+Pos)>encodingLength) || (Length < 0))
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		{
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		User::Leave(KErrArgument);
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		}
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	iStartOfContents = Pos;
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	iLength = Length;
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	}
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EXPORT_C TPtrC8 TASN1DecGeneric::GetContentDER(void) const
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	{
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	return iEncoding.Mid(iStartOfContents, iLength);
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	}
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EXPORT_C TInt TASN1DecGeneric::LengthDER(void) const
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	{
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	return iLength+iStartOfContents;
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	}
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EXPORT_C TInt TASN1DecGeneric::LengthDERContent(void) const
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	{
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	return iLength;
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	}
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EXPORT_C TInt TASN1DecGeneric::LengthDERHeader() const
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	{
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	return LengthDER() - LengthDERContent();
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	}
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EXPORT_C TPtrC8 TASN1DecGeneric::Encoding() const
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	{
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	return iEncoding.Left(LengthDER());
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	}
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EXPORT_C TTagType TASN1DecGeneric::Tag() const
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// we can inline this
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	{
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	return iExplicitTag;
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	}
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EXPORT_C TASN1Class TASN1DecGeneric::Class() const
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// we can inline this
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	{
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	return iClass;
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	}
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   148