--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/networksecurity/tlsprovider/Test/tlstest2/dhparamreader.cpp	Tue Jan 26 15:23:49 2010 +0200
@@ -0,0 +1,71 @@
+// Copyright (c) 2006-2009 Nokia Corporation and/or its subsidiary(-ies).
+// All rights reserved.
+// This component and the accompanying materials are made available
+// under the terms of "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:
+//
+
+/**
+ @file dhparamreader.cpp
+ @internalTechnology
+*/
+#include "dhparamreader.h"
+
+#include <f32file.h>
+#include <asn1dec.h>
+
+void CDHParamReader::DecodeDERL(const TDesC& aDerFile,
+	RInteger& aPrimeOut, RInteger& aGeneratorOut)
+	{
+	RFs fs;
+	User::LeaveIfError(fs.Connect());
+	CleanupClosePushL(fs);
+	
+	RFile file;
+	User::LeaveIfError(file.Open(fs, aDerFile, EFileRead));
+	CleanupClosePushL(file);
+	
+	TInt fileSize(0);
+	User::LeaveIfError(file.Size(fileSize));
+	
+	HBufC8* derData = HBufC8::NewLC(fileSize);
+	TPtr8 derPtr = derData->Des();
+	User::LeaveIfError(file.Read(derPtr));
+	
+	// we know this should just be an ASN.1 sequence, consisting of two integers....
+	TASN1DecGeneric genDec(*derData);
+	genDec.InitL();
+	
+	if (genDec.Tag() != EASN1Sequence)
+		{
+		// not a sequence...
+		User::Leave(KErrNotSupported);
+		}
+	
+	TASN1DecSequence seq;
+	CArrayPtrFlat<TASN1DecGeneric>* ints = seq.DecodeDERLC(genDec);
+	
+	// validate the sequence data
+	if (ints->Count() != 2 || 
+		ints->At(0)->Tag() != EASN1Integer ||
+		ints->At(1)->Tag() != EASN1Integer)
+		{
+		// This isn't a DH parameter file we can recognise...
+		User::Leave(KErrNotSupported);
+		}
+		
+	// Read the integers from the sequence....
+	TASN1DecInteger decInt;
+	aPrimeOut = decInt.DecodeDERLongL(*ints->At(0));
+	aGeneratorOut = decInt.DecodeDERLongL(*ints->At(1));
+	
+	CleanupStack::PopAndDestroy(4, &fs); // file, derData, ints
+	}