1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/os/security/cryptoplugins/cryptospiplugins/source/softwarecrypto/rsaverifyimpl.cpp	Fri Jun 15 03:10:57 2012 +0200
     1.3 @@ -0,0 +1,143 @@
     1.4 +/*
     1.5 +* Copyright (c) 2006-2009 Nokia Corporation and/or its subsidiary(-ies).
     1.6 +* All rights reserved.
     1.7 +* This component and the accompanying materials are made available
     1.8 +* under the terms of the License "Eclipse Public License v1.0"
     1.9 +* which accompanies this distribution, and is available
    1.10 +* at the URL "http://www.eclipse.org/legal/epl-v10.html".
    1.11 +*
    1.12 +* Initial Contributors:
    1.13 +* Nokia Corporation - initial contribution.
    1.14 +*
    1.15 +* Contributors:
    1.16 +*
    1.17 +* Description: 
    1.18 +*
    1.19 +*/
    1.20 +
    1.21 +
    1.22 +#include "rsaverifyimpl.h"
    1.23 +#include "pluginconfig.h"
    1.24 +#include "rsafunction.h"
    1.25 +
    1.26 +using namespace SoftwareCrypto;
    1.27 +
    1.28 +// Implementation of CRSAVerifierImpl
    1.29 +CRSAVerifierImpl* CRSAVerifierImpl::NewL(const CKey& aKey, TUid aPaddingMode)
    1.30 +	{
    1.31 +	CRSAVerifierImpl* self = CRSAVerifierImpl::NewLC(aKey, aPaddingMode);
    1.32 +	CleanupStack::Pop(self);
    1.33 +	return self;
    1.34 +	}
    1.35 +	
    1.36 +CRSAVerifierImpl* CRSAVerifierImpl::NewLC(const CKey& aKey, TUid aPaddingMode)
    1.37 +	{
    1.38 +	CRSAVerifierImpl* self = new(ELeave) CRSAVerifierImpl(aPaddingMode);
    1.39 +	CleanupStack::PushL(self);
    1.40 +	self->ConstructL(aKey);
    1.41 +	return self;
    1.42 +	}
    1.43 +
    1.44 +CRSAVerifierImpl::CRSAVerifierImpl(TUid aPaddingMode)
    1.45 +	: iPaddingMode(aPaddingMode)
    1.46 +	{
    1.47 +	}
    1.48 +
    1.49 +CRSAVerifierImpl::~CRSAVerifierImpl()
    1.50 +	{
    1.51 +	delete iPadding;
    1.52 +	}
    1.53 +	
    1.54 +void CRSAVerifierImpl::ConstructL(const CKey& aKey)
    1.55 +	{
    1.56 +	CVerifierImpl::ConstructL(aKey);
    1.57 +	SetPaddingModeL(iPaddingMode);
    1.58 +	}
    1.59 +	
    1.60 +CExtendedCharacteristics* CRSAVerifierImpl::CreateExtendedCharacteristicsL()
    1.61 +	{
    1.62 +	// All Symbian software plug-ins have unlimited concurrency, cannot be reserved
    1.63 +	// for exclusive use and are not CERTIFIED to be standards compliant.
    1.64 +	return CExtendedCharacteristics::NewL(KMaxTInt, EFalse);
    1.65 +	}
    1.66 +
    1.67 +const CExtendedCharacteristics* CRSAVerifierImpl::GetExtendedCharacteristicsL()
    1.68 +	{
    1.69 +	return CRSAVerifierImpl::CreateExtendedCharacteristicsL();
    1.70 +	}
    1.71 +
    1.72 +TUid CRSAVerifierImpl::ImplementationUid() const
    1.73 +	{
    1.74 +	return KCryptoPluginRsaVerifierUid;
    1.75 +	}
    1.76 +
    1.77 +void CRSAVerifierImpl::SetPaddingModeL(TUid aPaddingMode) 
    1.78 +	{
    1.79 +	CPadding* padding(0);
    1.80 +	switch (aPaddingMode.iUid)
    1.81 +		{
    1.82 +		case KPaddingModeNone:
    1.83 +			padding = CPaddingNone::NewL(GetMaximumOutputLengthL());
    1.84 +			break;
    1.85 +		case KPaddingModePkcs1_v1_5_Signature:
    1.86 +			padding = CPaddingPKCS1Signature::NewL(GetMaximumOutputLengthL());
    1.87 +			break;
    1.88 +		default:
    1.89 +			User::Leave(KErrNotSupported);
    1.90 +		}
    1.91 +	delete iPadding;
    1.92 +	iPadding = padding;
    1.93 +	iPaddingMode = aPaddingMode;
    1.94 +	Reset();	
    1.95 +	}
    1.96 +
    1.97 +void CRSAVerifierImpl::SetKeyL(const CKey& aPublicKey)
    1.98 +	{
    1.99 +	DoSetKeyL(aPublicKey);
   1.100 +	Reset();	
   1.101 +	}
   1.102 +
   1.103 +TInt CRSAVerifierImpl::GetMaximumInputLengthL() const
   1.104 +	{
   1.105 +	return GetMaximumOutputLengthL() - iPadding->MinPaddingLength();	
   1.106 +	}
   1.107 +
   1.108 +TInt CRSAVerifierImpl::GetMaximumOutputLengthL() const
   1.109 +	{
   1.110 +	const TInteger& paramN = iKey->GetBigIntL(KRsaKeyParameterNUid);
   1.111 +	return paramN.ByteCount();	
   1.112 +	}
   1.113 +
   1.114 +void CRSAVerifierImpl::VerifyL(const TDesC8& aInput, const CCryptoParams& aSignature, TBool& aVerificationResult)
   1.115 +	{
   1.116 +	HBufC8* output = NULL;
   1.117 +	InverseSignL(output, aSignature);
   1.118 +	CleanupStack::PushL(output);
   1.119 +
   1.120 +	// is the original hash the same as the hash extracted from the signature
   1.121 +	aVerificationResult = EFalse;
   1.122 +	if (!output->Compare(aInput))
   1.123 +		{
   1.124 +		aVerificationResult = ETrue;
   1.125 +		}
   1.126 +	CleanupStack::PopAndDestroy(output);
   1.127 +	}
   1.128 +
   1.129 +void CRSAVerifierImpl::InverseSignL(HBufC8*& aOutput, const CCryptoParams& aSignature)
   1.130 +	{
   1.131 +	// extract the original hash from the signature
   1.132 +	const TInteger& signature = aSignature.GetBigIntL(KRsaSignatureParameterSUid);
   1.133 +	RInteger output;
   1.134 +	RSAFunction::VerifyL(*iKey, signature, output);
   1.135 +	CleanupClosePushL(output);
   1.136 +
   1.137 +	// format the extracted hash so it can be compared with the original hash
   1.138 +	HBufC8* paddedHashPtr = output.BufferLC();
   1.139 +	aOutput = HBufC8::NewLC(GetMaximumOutputLengthL());
   1.140 +	TPtr8 unpaddedHash = aOutput->Des();
   1.141 +
   1.142 +	iPadding->UnPadL(*paddedHashPtr, unpaddedHash);
   1.143 +
   1.144 +	CleanupStack::Pop(aOutput);
   1.145 +	CleanupStack::PopAndDestroy(2, &output);
   1.146 +	}