crypto/weakcryptospi/source/asymmetric/dhkeys.cpp
author Mikko Sunikka <mikko.sunikka@nokia.com>
Fri, 06 Nov 2009 13:21:00 +0200
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/*
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* Copyright (c) 2003-2009 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 <asymmetrickeys.h>
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#include "dhkeypairshim.h"
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/* CDHParameters */
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EXPORT_C const TInteger& CDHParameters::N(void) const
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	{
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	return iN;
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	}
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EXPORT_C const TInteger& CDHParameters::G(void) const
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	{
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	return iG;
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	}
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EXPORT_C CDHParameters::~CDHParameters(void)
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	{
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	iN.Close();
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	iG.Close();
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	}
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EXPORT_C CDHParameters::CDHParameters(RInteger& aN, RInteger& aG) : iN(aN), iG(aG)
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	{
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	}
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/* CDHPublicKey */
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EXPORT_C CDHPublicKey* CDHPublicKey::NewL(RInteger& aN, RInteger& aG, 
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	RInteger& aX)
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	{
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	CDHPublicKey* self = new(ELeave) CDHPublicKey(aN, aG, aX);
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	return self;
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	}
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EXPORT_C CDHPublicKey* CDHPublicKey::NewLC(RInteger& aN, RInteger& aG, 
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	RInteger& aX)
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	{
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	CDHPublicKey* self = NewL(aN, aG, aX);
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	CleanupStack::PushL(self);
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	return self;
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	}
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EXPORT_C const TInteger& CDHPublicKey::X(void) const
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	{
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	return iX;
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	}
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EXPORT_C CDHPublicKey::CDHPublicKey(RInteger& aN, RInteger& aG, RInteger& aX)
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	: CDHParameters(aN, aG), iX(aX)
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	{
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	}
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EXPORT_C CDHPublicKey::~CDHPublicKey(void)
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	{
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	iX.Close();
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	}
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/* CDHPrivateKey */
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EXPORT_C CDHPrivateKey* CDHPrivateKey::NewL(RInteger& aN, RInteger& aG, 
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	RInteger& ax)
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	{
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	CDHPrivateKey* self = new(ELeave) CDHPrivateKey(aN, aG, ax);
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	return self;
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	}
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EXPORT_C CDHPrivateKey* CDHPrivateKey::NewLC(RInteger& aN, RInteger& aG, 
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	RInteger& ax)
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	{
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	CDHPrivateKey* self = NewL(aN, aG, ax);
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	CleanupStack::PushL(self);
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	return self;
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	}
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EXPORT_C const TInteger& CDHPrivateKey::x(void) const
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	{
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	return ix;
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	}
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EXPORT_C CDHPrivateKey::CDHPrivateKey(RInteger& aN, RInteger& aG, RInteger& ax)
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	: CDHParameters(aN, aG), ix(ax)
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	{
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	}
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EXPORT_C CDHPrivateKey::~CDHPrivateKey(void)
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	{
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	ix.Close();
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	}
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/* CDHKeyPair */
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EXPORT_C CDHKeyPair* CDHKeyPair::NewL(RInteger& aN, RInteger& aG)
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	{
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	CDHKeyPairShim* self = CDHKeyPairShim::NewLC(aN, aG);
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	CleanupStack::Pop(self);
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	return self;
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	}
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EXPORT_C CDHKeyPair* CDHKeyPair::NewLC(RInteger& aN, RInteger& aG)
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	{
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	CDHKeyPairShim* self = CDHKeyPairShim::NewLC(aN, aG);
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	return self;
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	}
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EXPORT_C CDHKeyPair* CDHKeyPair::NewL(RInteger& aN, RInteger& aG, RInteger& ax)
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	{
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	CDHKeyPairShim* self = CDHKeyPairShim::NewLC(aN, aG, ax);
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	CleanupStack::Pop(self);
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	return self;
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	}
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EXPORT_C CDHKeyPair* CDHKeyPair::NewLC(RInteger& aN, RInteger& aG, RInteger& ax)
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	{
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	CDHKeyPairShim* self = CDHKeyPairShim::NewLC(aN, aG, ax);
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	return self;
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	}
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EXPORT_C const CDHPublicKey& CDHKeyPair::PublicKey(void) const
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	{
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	return *iPublic;
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	}
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EXPORT_C const CDHPrivateKey& CDHKeyPair::PrivateKey(void) const
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	{
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	return *iPrivate;
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	}
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EXPORT_C CDHKeyPair::~CDHKeyPair(void)
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	{
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	delete iPublic;
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	delete iPrivate;
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	}
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EXPORT_C CDHKeyPair::CDHKeyPair(void)
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	{
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	}
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// Excluded from coverage due to shim replacements.
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#ifdef _BullseyeCoverage
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#pragma suppress_warnings on
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#pragma BullseyeCoverage off
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#pragma suppress_warnings off
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#endif
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EXPORT_C void CDHKeyPair::ConstructL(RInteger& aN, RInteger& aG)
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	{
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	//declaring a reference just for clarity in NewRandomL statement
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	RInteger& nminus2 = aN;
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	--nminus2;
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	--nminus2;
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	//find a random x | 1 <= x <= n-2
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	RInteger x = RInteger::NewRandomL(TInteger::One(), nminus2);
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	CleanupStack::PushL(x);
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	++nminus2;
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	++nminus2; // reincrement aN
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	ConstructL(aN, aG, x);
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	CleanupStack::Pop(&x);
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	}
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EXPORT_C void CDHKeyPair::ConstructL(RInteger& aN, RInteger& aG, RInteger& ax)
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	{
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	//declaring a reference just for clarity in if statements
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	RInteger& nminus2 = aN;
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	--nminus2;
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	--nminus2;
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	if( aG < TInteger::Two() || aG > nminus2 )
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		{
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		User::Leave(KErrArgument);
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		}
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	//In the case of the other ConstructL calling this function this if
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	//statement is redundant.  However, we need to check as this is can be
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	//called without going through the other api.
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	if( ax < TInteger::One() || ax > nminus2 )
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		{
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		User::Leave(KErrArgument);
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		}
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	++nminus2;
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	++nminus2; // reincrement aN
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	// Calculate X = g^(x) mod n; (note the case sensitivity)
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	RInteger X = TInteger::ModularExponentiateL(aG, ax, aN);
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	CleanupStack::PushL(X);
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	RInteger n1 = RInteger::NewL(aN);
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	CleanupStack::PushL(n1);
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	RInteger g1 = RInteger::NewL(aG);
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	CleanupStack::PushL(g1);
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	iPublic = CDHPublicKey::NewL(n1, g1, X);
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	CleanupStack::Pop(3, &X); // g1, n1, X all owned by iPublic
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	iPrivate = CDHPrivateKey::NewL(aN, aG, ax);
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	}
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// Unused exported and protected members. So, exclude them from coverage.
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EXPORT_C CDHParameters::CDHParameters(void)
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	{
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	}
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EXPORT_C CDHPrivateKey::CDHPrivateKey(void)
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	{
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	}
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EXPORT_C CDHPublicKey::CDHPublicKey(void)
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	{
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	}