Symaptic: os/security/cryptoplugins/cryptospiplugins/source/softwarecrypto/dhimpl.cpp@bde4ae8d615e

     1 /*

     2 * Copyright (c) 2006-2009 Nokia Corporation and/or its subsidiary(-ies).

     3 * All rights reserved.

     4 * This component and the accompanying materials are made available

     5 * under the terms of the License "Eclipse Public License v1.0"

     6 * which accompanies this distribution, and is available

     7 * at the URL "http://www.eclipse.org/legal/epl-v10.html".

8 *

     9 * Initial Contributors:

    10 * Nokia Corporation - initial contribution.

    11 *

    12 * Contributors:

    13 *

    14 * Description:

    15 *

    16 */

    19 #include "dhimpl.h"

    20 #include "pluginconfig.h"

    22 using namespace SoftwareCrypto;

    23 using namespace CryptoSpi;

    25 /* CDHImpl */

    26 CDHImpl::CDHImpl()

    27 	{

    28 	}

    30 CDHImpl::~CDHImpl()

    31 	{

    32 	}

    34 CDHImpl* CDHImpl::NewL(const CKey& aPrivateKey, const CCryptoParams* aParams)

    35 	{

    36 	CDHImpl* self = CDHImpl::NewLC(aPrivateKey, aParams);

    37 	CleanupStack::Pop(self);

    38 	return self;

    39 	}

    41 CDHImpl* CDHImpl::NewLC(const CKey& aPrivateKey, const CCryptoParams* aParams)

    42 	{

    43 	CDHImpl* self = new(ELeave) CDHImpl();

    44 	CleanupStack::PushL(self);

    45 	self->ConstructL(aPrivateKey, aParams);

    46 	return self;

    47 	}

    49 CKey* CDHImpl::AgreeL(const CKey& aOtherPublicKey, const CCryptoParams* aParams)

    50 	{

    51 	/*

    52 	 * unpack the parameters, we're expecting the N and G parameters

    53 	 */

    54 	const TInteger& N = aParams->GetBigIntL(KDhKeyParameterNUid);

    55 	const TInteger& G = aParams->GetBigIntL(KDhKeyParameterGUid);

    56 	const TInteger& privateN = iSharedParams->GetBigIntL(KDhKeyParameterNUid);

    57 	const TInteger& privateG = iSharedParams->GetBigIntL(KDhKeyParameterGUid);

    58 	const TInteger& X = aOtherPublicKey.GetBigIntL(KDhKeyParameterXUid);

    59 	const TInteger& x = iPrivateKey->GetBigIntL(KDhKeyParameterxUid);

    61 	/*

    62 	 * both DH keys (ie our private and their public keys) must use the same N and G parameters

    63 	 */

    64 	if ((N != privateN) || (G != privateG))

    65 		{

    66 		User::Leave(KErrArgument);

    67 		}

    69 	/*

    70 	 * do the key agreement algo X ^ x mod N

    71 	 */

    72 	RInteger result = TInteger::ModularExponentiateL(X, x, N);

    73 	CleanupClosePushL(result);

    75 	/*

    76 	 * create the agreed key

    77 	 */

    78 	CCryptoParams* agreedKeyParameters = CCryptoParams::NewLC();

    79 	agreedKeyParameters->AddL(result, KSymmetricKeyParameterUid);

    80 	TKeyProperty agreedKeyProperties = {KDHAgreementUid, KCryptoPluginDhKeyAgreementUid,

    81 									KDHAgreedKeyUid, KNonEmbeddedKeyUid };

    82 	CKey* agreedKey = CKey::NewL(agreedKeyProperties, *agreedKeyParameters);

    84 	// cleanup result, agreedKeyParameters

    85 	CleanupStack::PopAndDestroy(2, &result);

    86 	return agreedKey;

    87 	}

    89 TUid CDHImpl::ImplementationUid() const

    90 	{

    91 	return KCryptoPluginDhKeyAgreementUid;

    92 	}

    94 CExtendedCharacteristics* CDHImpl::CreateExtendedCharacteristicsL()

    95 	{

    96 	// All Symbian software plug-ins have unlimited concurrency, cannot be

    97 	// reserved for exclusive use and are not CERTIFIED to be standards compliant.

    98 	return CExtendedCharacteristics::NewL(KMaxTInt, EFalse);

    99 	}

   101 const CExtendedCharacteristics* CDHImpl::GetExtendedCharacteristicsL()

   102 	{

   103 	return CDHImpl::CreateExtendedCharacteristicsL();

   104 	}

author	sl@SLION-WIN7.fritz.box
	Fri, 15 Jun 2012 03:10:57 +0200
changeset 0	bde4ae8d615e
permissions	-rw-r--r--