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/*
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* Copyright (c) 2006-2009 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 "dhimpl.h"
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#include "pluginconfig.h"
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using namespace SoftwareCrypto;
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using namespace CryptoSpi;
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/* CDHImpl */
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CDHImpl::CDHImpl()
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{
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}
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CDHImpl::~CDHImpl()
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{
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}
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CDHImpl* CDHImpl::NewL(const CKey& aPrivateKey, const CCryptoParams* aParams)
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{
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CDHImpl* self = CDHImpl::NewLC(aPrivateKey, aParams);
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CleanupStack::Pop(self);
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return self;
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}
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CDHImpl* CDHImpl::NewLC(const CKey& aPrivateKey, const CCryptoParams* aParams)
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{
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CDHImpl* self = new(ELeave) CDHImpl();
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CleanupStack::PushL(self);
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self->ConstructL(aPrivateKey, aParams);
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return self;
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}
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CKey* CDHImpl::AgreeL(const CKey& aOtherPublicKey, const CCryptoParams* aParams)
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{
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/*
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* unpack the parameters, we're expecting the N and G parameters
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*/
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const TInteger& N = aParams->GetBigIntL(KDhKeyParameterNUid);
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const TInteger& G = aParams->GetBigIntL(KDhKeyParameterGUid);
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const TInteger& privateN = iSharedParams->GetBigIntL(KDhKeyParameterNUid);
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const TInteger& privateG = iSharedParams->GetBigIntL(KDhKeyParameterGUid);
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const TInteger& X = aOtherPublicKey.GetBigIntL(KDhKeyParameterXUid);
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const TInteger& x = iPrivateKey->GetBigIntL(KDhKeyParameterxUid);
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/*
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* both DH keys (ie our private and their public keys) must use the same N and G parameters
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*/
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if ((N != privateN) || (G != privateG))
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{
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User::Leave(KErrArgument);
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}
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/*
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* do the key agreement algo X ^ x mod N
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*/
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RInteger result = TInteger::ModularExponentiateL(X, x, N);
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CleanupClosePushL(result);
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/*
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* create the agreed key
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*/
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CCryptoParams* agreedKeyParameters = CCryptoParams::NewLC();
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agreedKeyParameters->AddL(result, KSymmetricKeyParameterUid);
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TKeyProperty agreedKeyProperties = {KDHAgreementUid, KCryptoPluginDhKeyAgreementUid,
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KDHAgreedKeyUid, KNonEmbeddedKeyUid };
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CKey* agreedKey = CKey::NewL(agreedKeyProperties, *agreedKeyParameters);
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// cleanup result, agreedKeyParameters
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CleanupStack::PopAndDestroy(2, &result);
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return agreedKey;
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}
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TUid CDHImpl::ImplementationUid() const
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{
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return KCryptoPluginDhKeyAgreementUid;
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}
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CExtendedCharacteristics* CDHImpl::CreateExtendedCharacteristicsL()
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{
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// All Symbian software plug-ins have unlimited concurrency, cannot be
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// reserved for exclusive use and are not CERTIFIED to be standards compliant.
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return CExtendedCharacteristics::NewL(KMaxTInt, EFalse);
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}
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const CExtendedCharacteristics* CDHImpl::GetExtendedCharacteristicsL()
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{
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return CDHImpl::CreateExtendedCharacteristicsL();
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}
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