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os/security/cryptoplugins/cryptospiplugins/source/softwarecrypto/asymmetriccipherimpl.cpp
author sl@SLION-WIN7.fritz.box
Fri, 15 Jun 2012 03:10:57 +0200
changeset 0 bde4ae8d615e
permissions -rw-r--r--
First public contribution. 
     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 <e32def.h>

    20 #include "keys.h"

    21 #include "asymmetriccipherimpl.h"

    22 #include <cryptostrength.h>

    23 #include <cryptospi/cryptospidef.h>

    24 #include <cryptospi/plugincharacteristics.h>

    25 #include "pluginconfig.h"

    26 #include "common/inlines.h"

    27 

    28 using namespace SoftwareCrypto;

    29 

    30 CAsymmetricCipherImpl::CAsymmetricCipherImpl(

    31 	TUid aCryptoMode,

    32 	TUid aPaddingMode) :

    33 	iCryptoMode(aCryptoMode),

    34 	iPaddingMode(aPaddingMode)

    35 	{

    36 	}

    37 

    38 void CAsymmetricCipherImpl::ConstructL(const CKey& aKey)

    39 	{

    40 	DoSetCryptoModeL(iCryptoMode);

    41 	DoSetKeyL(aKey);

    42 	DoSetPaddingModeL(iPaddingMode);

    43 	}

    44 	

    45 CAsymmetricCipherImpl::~CAsymmetricCipherImpl()

    46 	{

    47 	delete iKey;

    48 	delete iPadding;

    49 	}

    50 		

    51 void CAsymmetricCipherImpl::Close()

    52 	{

    53 	delete this;

    54 	}

    55 	

    56 void CAsymmetricCipherImpl::Reset()

    57 	{

    58 	}

    59 	

    60 TAny* CAsymmetricCipherImpl::GetExtension(TUid /*aExtensionId*/)

    61 	{

    62 	return 0;

    63 	}

    64 	

    65 void CAsymmetricCipherImpl::GetCharacteristicsL(const TAny*& aPluginCharacteristics)

    66 	{

    67 	TInt numCiphers = sizeof(KAsymmetricCipherCharacteristics)/sizeof(TAsymmetricCipherCharacteristics*);

    68 	TInt32 implUid = ImplementationUid().iUid;

    69 	for (TInt i = 0; i < numCiphers; ++i)

    70 		{

    71 		if (KAsymmetricCipherCharacteristics[i]->cmn.iImplementationUID == implUid)

    72 			{

    73 			aPluginCharacteristics = KAsymmetricCipherCharacteristics[i];

    74 			break;

    75 			}

    76 		}

    77 	}

    78 

    79 void CAsymmetricCipherImpl::SetKeyL(const CKey& aKey)

    80 	{

    81 	DoSetKeyL(aKey);

    82 	}

    83 

    84 void CAsymmetricCipherImpl::DoSetKeyL(const CKey& aKey)

    85 	{

    86 	delete iKey;								// delete any previous key

    87 	iKey = CKey::NewL(aKey);

    88 	}

    89 

    90 void CAsymmetricCipherImpl::SetCryptoModeL(TUid aCryptoMode)

    91 	{

    92 	DoSetCryptoModeL(aCryptoMode);

    93 	Reset();

    94 	}

    95 	

    96 void CAsymmetricCipherImpl::DoSetCryptoModeL(TUid aCryptoMode)

    97 	{

    98 	switch (aCryptoMode.iUid)

    99 		{

   100 		case KCryptoModeEncrypt:

   101 		case KCryptoModeDecrypt:

   102 			break;

   103 		default:

   104 			User::Leave(KErrNotSupported);

   105 		}

   106 	iCryptoMode = aCryptoMode;

   107 	}

   108 

   109 void CAsymmetricCipherImpl::SetPaddingModeL(TUid aPaddingMode)

   110 	{

   111 	DoSetPaddingModeL(aPaddingMode);

   112 	Reset();

   113 	}

   114 	

   115 void CAsymmetricCipherImpl::DoSetPaddingModeL(TUid aPaddingMode)

   116 	{

   117 	CPadding* padding(0);

   118 	TInt padlength = 0;

   119 	

   120 	switch (iCryptoMode.iUid)

   121 		{

   122 		case KCryptoModeEncrypt:

   123 			padlength = GetMaximumOutputLengthL();

   124 			break;

   125 		case KCryptoModeDecrypt:

   126 			padlength = GetMaximumInputLengthL();

   127 			break;

   128 		}

   129 		

   130 	switch (aPaddingMode.iUid)

   131 		{

   132 		case KPaddingModeNone:

   133 			padding = CPaddingNone::NewL(padlength);

   134 			break;

   135 		case KPaddingModePkcs1_v1_5_Encryption:

   136 			padding = CPaddingPKCS1Encryption::NewL(padlength);

   137 			break;

   138 		default:

   139 			User::Leave(KErrNotSupported);

   140 		}

   141 		

   142 	delete iPadding;

   143 	iPadding = padding;

   144 	iPaddingMode = aPaddingMode;

   145 	}

   146 

   147 // Methods implemented in subclass. No coverage here.

   148 #ifdef _BullseyeCoverage

   149 #pragma suppress_warnings on

   150 #pragma BullseyeCoverage off

   151 #pragma suppress_warnings off

   152 #endif

   153 TInt CAsymmetricCipherImpl::GetMaximumOutputLengthL() const

   154 	{

   155 	// Override in subclass

   156 	User::Leave(KErrNotSupported);

   157 	return 0;

   158 	}

   159 

   160 TInt CAsymmetricCipherImpl::GetMaximumInputLengthL() const

   161 	{

   162 	// Override in subclass

   163 	User::Leave(KErrNotSupported);

   164 	return 0;

   165 	}

   166
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