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 "../../../source/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 TInt CAsymmetricCipherImpl::GetMaximumOutputLengthL() const

    80 	{

    81 	// Override in subclass

    82 	User::Leave(KErrNotSupported);

    83 	return 0;

    84 	}

    85 

    86 TInt CAsymmetricCipherImpl::GetMaximumInputLengthL() const

    87 	{

    88 	// Override in subclass

    89 	User::Leave(KErrNotSupported);

    90 	return 0;

    91 	}

    92 

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

    94 	{

    95 	DoSetKeyL(aKey);

    96 	}

    97 

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

    99 	{

   100 	delete iKey;								// delete any previous key

   101 	iKey = CKey::NewL(aKey);

   102 	}

   103 

   104 void CAsymmetricCipherImpl::SetCryptoModeL(TUid aCryptoMode)

   105 	{

   106 	DoSetCryptoModeL(aCryptoMode);

   107 	Reset();

   108 	}

   109 	

   110 void CAsymmetricCipherImpl::DoSetCryptoModeL(TUid aCryptoMode)

   111 	{

   112 	switch (aCryptoMode.iUid)

   113 		{

   114 		case KCryptoModeEncrypt:

   115 		case KCryptoModeDecrypt:

   116 			break;

   117 		default:

   118 			User::Leave(KErrNotSupported);

   119 		}

   120 	iCryptoMode = aCryptoMode;

   121 	}

   122 

   123 void CAsymmetricCipherImpl::SetPaddingModeL(TUid aPaddingMode)

   124 	{

   125 	DoSetPaddingModeL(aPaddingMode);

   126 	Reset();

   127 	}

   128 	

   129 void CAsymmetricCipherImpl::DoSetPaddingModeL(TUid aPaddingMode)

   130 	{

   131 	CPadding* padding(0);

   132 	TInt padlength = 0;

   133 	

   134 	switch (iCryptoMode.iUid)

   135 		{

   136 		case KCryptoModeEncrypt:

   137 			padlength = GetMaximumOutputLengthL();

   138 			break;

   139 		case KCryptoModeDecrypt:

   140 			padlength = GetMaximumInputLengthL();

   141 			break;

   142 		}

   143 		

   144 	switch (aPaddingMode.iUid)

   145 		{

   146 		case KPaddingModeNone:

   147 			padding = CPaddingNone::NewL(padlength);

   148 			break;

   149 		case KPaddingModePkcs1_v1_5_Encryption:

   150 			padding = CPaddingPKCS1Encryption::NewL(padlength);

   151 			break;

   152 		default:

   153 			User::Leave(KErrNotSupported);

   154 		}

   155 		

   156 	delete iPadding;

   157 	iPadding = padding;

   158 	iPaddingMode = aPaddingMode;

   159 	}