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 */

    17 

    18 

    19 #include "rsasignerimpl.h"

    20 #include "pluginconfig.h"

    21 #include "rsafunction.h"

    22 

    23 using namespace SoftwareCrypto;

    24 

    25 // Implementation of CRSASignerImpl 

    26 CRSASignerImpl* CRSASignerImpl::NewL(const CKey& aKey, TUid aPaddingMode)

    27 	{

    28 	CRSASignerImpl* self = CRSASignerImpl::NewLC(aKey, aPaddingMode);

    29 	CleanupStack::Pop(self);

    30 	return self;

    31 	}

    32 

    33 CRSASignerImpl* CRSASignerImpl::NewLC(const CKey& aKey, TUid aPaddingMode)

    34 	{

    35 	CRSASignerImpl* self = new(ELeave) CRSASignerImpl(aPaddingMode);

    36 	CleanupStack::PushL(self);

    37 	self->ConstructL(aKey);

    38 	return self;

    39 	}

    40 

    41 CRSASignerImpl::CRSASignerImpl(TUid aPaddingMode) 

    42 	: iPaddingMode(aPaddingMode)

    43 	{

    44 	}

    45 

    46 CRSASignerImpl::~CRSASignerImpl()

    47 	{

    48 	delete iPadding;

    49 	}

    50 

    51 void CRSASignerImpl::ConstructL(const CKey& aKey)

    52 	{

    53 	CSignerImpl::ConstructL(aKey);

    54 	SetPaddingModeL(iPaddingMode);

    55 	}

    56 

    57 CExtendedCharacteristics* CRSASignerImpl::CreateExtendedCharacteristicsL()

    58 	{

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

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

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

    62 	}

    63 

    64 const CExtendedCharacteristics* CRSASignerImpl::GetExtendedCharacteristicsL()

    65 	{

    66 	return CRSASignerImpl::CreateExtendedCharacteristicsL();

    67 	}

    68 

    69 TUid CRSASignerImpl::ImplementationUid() const

    70 	{

    71 	return KCryptoPluginRsaSignerUid;

    72 	}

    73 

    74 void CRSASignerImpl::SetKeyL(const CKey& aPrivateKey) 

    75 	{

    76 	DoSetKeyL(aPrivateKey);

    77 	Reset();

    78 	}

    79 

    80 void CRSASignerImpl::SetPaddingModeL(TUid aPaddingMode)

    81 	{

    82 	CPadding* padding(0);

    83 	switch (aPaddingMode.iUid)

    84 		{

    85 		case KPaddingModeNone:

    86 			padding = CPaddingNone::NewL(GetMaximumOutputLengthL());

    87 			break;

    88 		case KPaddingModePkcs1_v1_5_Signature:

    89 			padding = CPaddingPKCS1Signature::NewL(GetMaximumOutputLengthL());

    90 			break;

    91 		default:

    92 			User::Leave(KErrNotSupported);

    93 		}

    94 		

    95 	delete iPadding;

    96 	iPadding = padding;

    97 	iPaddingMode = aPaddingMode;

    98 	Reset();

    99 	}

   100 

   101 TInt CRSASignerImpl::GetMaximumInputLengthL() const

   102 	{

   103 	return GetMaximumOutputLengthL() - iPadding->MinPaddingLength();	

   104 	}

   105 

   106 TInt CRSASignerImpl::GetMaximumOutputLengthL() const

   107 	{

   108 	const TInteger& paramN = iKey->GetBigIntL(KRsaKeyParameterNUid);

   109 	return paramN.ByteCount();	

   110 	}

   111 

   112 void CRSASignerImpl::SignL(const TDesC8& aInput, CCryptoParams& aSignature) 

   113 	{

   114 	HBufC8* buf = HBufC8::NewLC(GetMaximumOutputLengthL());

   115 	TPtr8 ptr = buf->Des();

   116 	

   117 	//The following will panic if aInput is larger than MaxOutputLength() It is

   118 	//likely that the caller has passed in something that has not been hashed.

   119 	//This is a programming, and likely a security error, in client code, not a

   120 	//problem here.

   121 	iPadding->PadL(aInput, ptr);

   122 

   123 	RInteger input = RInteger::NewL(ptr);

   124 	CleanupClosePushL(input);

   125 	RInteger output;

   126 

   127 	RSAFunction::SignL(*iKey, input, output);

   128 	CleanupClosePushL(output);

   129 

   130 	aSignature.AddL(output, KRsaSignatureParameterSUid);

   131 	CleanupStack::PopAndDestroy(3, buf); //input, buf

   132 	}