--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/crypto/weakcrypto/source/hash/hmac.cpp	Thu Jun 24 15:39:07 2010 +0530
@@ -0,0 +1,221 @@
+/*
+* Copyright (c) 2005-2009 Nokia Corporation and/or its subsidiary(-ies).
+* All rights reserved.
+* This component and the accompanying materials are made available
+* under the terms of the License "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
+*/
+
+
+#include <e32std.h>
+#include <hash.h>
+
+#define EXPANDLOOP
+
+//
+// HMAC implementation
+//
+
+CHMAC::CHMAC()
+:CMessageDigest(){}
+
+CHMAC::CHMAC(CMessageDigest* aDigest)
+	:CMessageDigest(),
+	iDigest(aDigest),
+	iInnerPad(KMaxBlockSize),
+	iOuterPad(KMaxBlockSize)
+{}
+
+CHMAC::CHMAC(const CHMAC& aMD)
+	:CMessageDigest(aMD), 
+	iDigest(NULL),
+	iInnerPad(aMD.iInnerPad), 
+	iOuterPad(aMD.iOuterPad),
+	iBlockSize(aMD.iBlockSize)
+	{}
+
+EXPORT_C CHMAC::~CHMAC(void)
+	{
+	delete iDigest;
+	}
+
+EXPORT_C CHMAC* CHMAC::NewL(const TDesC8& aKey,CMessageDigest* aDigest)
+	{
+	CHMAC* self=new(ELeave) CHMAC(aDigest);
+	CleanupStack::PushL(self);
+	self->InitialiseL(aKey);
+	CleanupStack::Pop(self);
+	return self;
+	}
+void CHMAC::InitialiseL(const TDesC8& aKey)
+	{
+	InitBlockSizeL();
+	// initialisation
+	if (iDigest)
+		{
+		iDigest->Reset();
+		if( (TUint32)aKey.Size() > iBlockSize)
+			{
+			iInnerPad = iDigest->Final(aKey);
+			}
+		else 
+			{
+			iInnerPad = aKey;
+			}
+			
+		TUint i;
+		for (i=iInnerPad.Size();i<iBlockSize;i++)
+			iInnerPad.Append(0);
+
+		iOuterPad=iInnerPad;
+
+		const TUint8 Magic1=0x36, Magic2=0x5c;
+		for (i=0;i<iBlockSize;i++)
+		{
+			iInnerPad[i]^=Magic1;
+			iOuterPad[i]^=Magic2;
+		}
+		//start inner hash
+		iDigest->Hash(iInnerPad);
+		}
+	}
+
+void CHMAC::InitBlockSizeL()
+ 	{
+	
+ 	 iBlockSize = iDigest->BlockSize();
+	 if(iBlockSize > KMaxBlockSize)
+		 {
+		 User::Leave(KErrNotSupported);
+		 }
+ 	 
+ 	 iInnerPad.SetLength(iBlockSize);
+ 	 iOuterPad.SetLength(iBlockSize);
+ 	 iInnerPadCopy.SetLength(iBlockSize);
+ 	 iOuterPadCopy.SetLength(iBlockSize);
+   	}
+
+EXPORT_C CMessageDigest* CHMAC::CopyL(void)
+	{
+	CHMAC* that=new(ELeave) CHMAC(*this);
+	CleanupStack::PushL(that);
+	that->iDigest=iDigest ? iDigest->CopyL() : NULL;
+	CleanupStack::Pop();
+	return that;
+	}
+EXPORT_C CMessageDigest*  CHMAC::ReplicateL(void)
+	{
+	CHMAC* that=new(ELeave) CHMAC(*this);
+	CleanupStack::PushL(that);
+	that->iDigest=iDigest ? iDigest->ReplicateL() : NULL;
+	that->Reset();
+	CleanupStack::Pop();
+	return that;
+	}
+EXPORT_C TInt CHMAC::BlockSize(void)
+	{
+	return iBlockSize;
+	}
+
+EXPORT_C TInt CHMAC::HashSize(void)
+	{
+	return iDigest ? iDigest->HashSize() : 0;
+	}
+EXPORT_C void CHMAC::Reset(void)
+	{
+	if (iDigest)
+		{
+		iDigest->Reset();
+		iDigest->Update(iInnerPad);
+		}
+	}
+
+//	JCS, There may be a more efficient method but I can't find it
+//	because using the DoFinal/DoUpdate functions directly calls
+//	Store/Restore at inappropriate times and scribbles over stored
+//	data
+//	This is the only way I've found to both generate a hash value
+//	and get this in the correctly updated state
+EXPORT_C TPtrC8 CHMAC::Hash(const TDesC8& aMessage)
+{
+	TPtrC8 ptr(KNullDesC8());
+	TPtrC8 finalPtr(KNullDesC8());
+	StoreState();
+	if (iDigest)
+	{
+		ptr.Set(iDigest->Final(aMessage));
+		iDigest->Update(iOuterPad);
+		finalPtr.Set(iDigest->Final(ptr));
+	}
+
+	RestoreState();
+	iDigest->Update(aMessage);
+
+	return (finalPtr);
+}
+
+EXPORT_C void CHMAC::Update(const TDesC8& aMessage)
+	{
+	if(iDigest)
+		{
+		iDigest->Update(aMessage);
+		}
+	}
+
+EXPORT_C TPtrC8 CHMAC::Final(const TDesC8& aMessage)
+	{
+	TPtrC8 ptr(KNullDesC8());
+	if(iDigest)
+		{
+		ptr.Set(iDigest->Final(aMessage));
+		iDigest->Update(iOuterPad);
+		iDigest->Final(ptr);
+		Reset();
+		}
+	return (ptr);
+	}
+
+EXPORT_C TPtrC8 CHMAC::Final()
+	{
+	TPtrC8 ptr(KNullDesC8());
+	if(iDigest)
+		{
+		ptr.Set(iDigest->Final());
+		iDigest->Update(iOuterPad);
+		iDigest->Final(ptr);
+		Reset();
+		}
+	return (ptr);
+	}
+
+void CHMAC::RestoreState()
+{
+	iOuterPad.Copy(iOuterPadCopy);
+	iInnerPad.Copy(iInnerPadCopy);
+	if (iDigest)
+		iDigest->RestoreState();
+}
+
+void CHMAC::StoreState()
+{
+	iOuterPadCopy.Copy(iOuterPad);
+	iInnerPadCopy.Copy(iInnerPad);
+	if (iDigest)
+		iDigest->StoreState();
+}
+
+