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/*
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* Copyright (c) 2003-2010 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 <asymmetric.h>
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#include <asymmetrickeys.h>
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#include <cryptospi/keys.h>
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#include "keyconverter.h"
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#include <cryptospi/cryptokeyagreementapi.h>
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#include <cryptospi/cryptospidef.h>
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using namespace CryptoSpi;
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CKeyAgreement* GetKeyAgreementCryptoInterfaceLC(TUid aKeyAgreementAlgoUid,
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CKey& aPrivateKey, CCryptoParams* aParams)
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{
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CKeyAgreement* keyAgreementImpl = 0;
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CKeyAgreementFactory::CreateKeyAgreementL(keyAgreementImpl,
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aKeyAgreementAlgoUid, aPrivateKey,
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aParams);
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CleanupStack::PushL(keyAgreementImpl);
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return keyAgreementImpl;
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}
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EXPORT_C CDH* CDH::NewL(const CDHPrivateKey& aPrivateKey)
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{
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CDH* self = CDH::NewLC(aPrivateKey);
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CleanupStack::Pop(self);
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return self;
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}
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EXPORT_C CDH* CDH::NewLC(const CDHPrivateKey& aPrivateKey)
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{
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CDH* self = new (ELeave) CDH(aPrivateKey);
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CleanupStack::PushL(self);
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return self;
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}
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EXPORT_C HBufC8* CDH::AgreeL(const CDHPublicKey& aPublicKey) const
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{
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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 ((aPublicKey.N() != iPrivateKey.N()) || (aPublicKey.G() != iPrivateKey.G()))
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{
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User::Leave(KErrArgument);
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}
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CKey* privateKey = KeyConverter::CreateKeyL(iPrivateKey);
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CleanupStack::PushL(privateKey);
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/*
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* package the common parameters N and G into a crypto params array
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* we've already checked that both the private and public keys have the
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* same N and G so we only need build this array once for both creating
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* and calling the interface
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*/
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CCryptoParams* keyParameters = CCryptoParams::NewLC();
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keyParameters->AddL(aPublicKey.N(), KDhKeyParameterNUid);
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keyParameters->AddL(aPublicKey.G(), KDhKeyParameterGUid);
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/*
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* get a DH key agreement interface
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*/
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CKeyAgreement* keyAgreementImpl = GetKeyAgreementCryptoInterfaceLC(KDHAgreementUid, *privateKey, keyParameters);
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/*
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* call the api to get a DH agreed key
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*/
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CKey* publicKey = KeyConverter::CreateKeyL(aPublicKey);
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CleanupStack::PushL(publicKey);
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CKey* agreedKey = keyAgreementImpl->AgreeL(*publicKey, keyParameters);
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CleanupStack::PushL(agreedKey);
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/*
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* extract the agreed key
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*/
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const TInteger& agreedKeyData = agreedKey->GetBigIntL(KSymmetricKeyParameterUid);
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HBufC8 *agreedKeyToReturn = agreedKeyData.BufferLC();
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CleanupStack::Pop(agreedKeyToReturn);
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/*
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* cleanup stack - it should contain privateKey, keyAgreementImpl, publicKey, keyParameters and agreedKey
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*/
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CleanupStack::PopAndDestroy(5, privateKey);
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return agreedKeyToReturn;
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}
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EXPORT_C CDH::CDH(const CDHPrivateKey& aPrivateKey) : iPrivateKey(aPrivateKey)
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{
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}
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