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/*
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* Copyright (c) 2007-2009 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 "dhkeypairgenimpl.h"
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#include "pluginconfig.h"
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#include "keypair.h"
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using namespace SoftwareCrypto;
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using namespace CryptoSpi;
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/* CDHKeyPairGenImpl */
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CDHKeyPairGenImpl::CDHKeyPairGenImpl()
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{
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}
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CDHKeyPairGenImpl::~CDHKeyPairGenImpl()
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{
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}
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CDHKeyPairGenImpl* CDHKeyPairGenImpl::NewL(void)
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{
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CDHKeyPairGenImpl* self = CDHKeyPairGenImpl::NewLC();
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CleanupStack::Pop(self);
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return self;
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}
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CDHKeyPairGenImpl* CDHKeyPairGenImpl::NewLC(void)
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{
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CDHKeyPairGenImpl* self = new(ELeave) CDHKeyPairGenImpl();
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CleanupStack::PushL(self);
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self->ConstructL();
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return self;
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}
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void CDHKeyPairGenImpl::ConstructL(void)
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{
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CKeyPairGenImpl::ConstructL();
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}
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CExtendedCharacteristics* CDHKeyPairGenImpl::CreateExtendedCharacteristicsL()
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{
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// All Symbian software plug-ins have unlimited concurrency, cannot be reserved
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// 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* CDHKeyPairGenImpl::GetExtendedCharacteristicsL()
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{
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return CDHKeyPairGenImpl::CreateExtendedCharacteristicsL();
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}
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TUid CDHKeyPairGenImpl::ImplementationUid() const
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{
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return KCryptoPluginDhKeyPairGenUid;
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}
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void CDHKeyPairGenImpl::Reset()
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{
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// does nothing in this plugin
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}
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void CDHKeyPairGenImpl::GenerateKeyPairL(TInt /*aKeySize*/, const CCryptoParams& aKeyParameters, CKeyPair*& aKeyPair)
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{
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/*
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* unpack the parameters, we're expecting the N and G parameters and if present the x parameter (aka private key)
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*/
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const TInteger& N = aKeyParameters.GetBigIntL(KDhKeyParameterNUid);
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const TInteger& G = aKeyParameters.GetBigIntL(KDhKeyParameterGUid);
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/*
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* do some sanity checking
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*/
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RInteger nminus2 = RInteger::NewL(N);
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CleanupStack::PushL(nminus2);
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--nminus2;
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--nminus2;
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if ((G < TInteger::Two()) || (G > nminus2))
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{
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User::Leave(KErrArgument);
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}
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/*
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* has a private key x been supplied? if not then generate it
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*/
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RInteger x;
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if (aKeyParameters.IsPresent(KDhKeyParameterxUid))
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{
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x = RInteger::NewL(aKeyParameters.GetBigIntL(KDhKeyParameterxUid));
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}
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else
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{
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// find a random x | 1 <= x <= n-2
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x = RInteger::NewRandomL(TInteger::One(), nminus2);
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}
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CleanupClosePushL(x);
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/*
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* generate the public key with X = G^(x) mod N
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*/
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RInteger X = TInteger::ModularExponentiateL(G, x, N);
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CleanupClosePushL(X);
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/*
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* create the keys parameters
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*/
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CCryptoParams* publicKeyParameters = CCryptoParams::NewLC();
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publicKeyParameters->AddL(X, KDhKeyParameterXUid);
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TKeyProperty publicKeyProperties = {KDHKeyPairGeneratorUid, KCryptoPluginDhKeyPairGenUid,
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KDHPublicKeyUid, KNonEmbeddedKeyUid };
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CCryptoParams* privateKeyParameters = CCryptoParams::NewLC();
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privateKeyParameters->AddL(x, KDhKeyParameterxUid);
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TKeyProperty privateKeyProperties = {KDHKeyPairGeneratorUid, KCryptoPluginDhKeyPairGenUid,
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KDHPrivateKeyUid, KNonEmbeddedKeyUid };
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/*
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* create the public key
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*/
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CKey* publicKey = CKey::NewL(publicKeyProperties, *publicKeyParameters);
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CleanupStack::PushL(publicKey);
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/*
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* create the private key
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*/
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CKey* privateKey = CKey::NewL(privateKeyProperties, *privateKeyParameters);
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CleanupStack::PushL(privateKey);
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/*
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* create the key pair
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*/
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aKeyPair = CKeyPair::NewL(publicKey, privateKey);
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/*
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* cleanup stack - it should contain nminus2, x (if allocated here), X, publicKeyParameters, privateKeyParameters, publicKey and privateKey
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*/
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CleanupStack::Pop(2, publicKey);
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CleanupStack::PopAndDestroy(5, &nminus2);
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}
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