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os/security/crypto/weakcryptospi/source/symmetric/rc2shim.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) 2006-2010 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 "rc2shim.h"

    20 

    21 #include <cryptospi/cryptoparams.h>

    22 #include <cryptospi/cryptosymmetriccipherapi.h>

    23 #include <cryptospi/cryptospidef.h>

    24 #include <cryptospi/plugincharacteristics.h>

    25 #include <cryptospi/keys.h>

    26 #include <cryptostrength.h>

    27 

    28 #include "../common/inlines.h"

    29 

    30 using namespace CryptoSpi;

    31 

    32 // CRC2EncryptorShim ////////////////////////////////////////////////////////

    33 CRC2EncryptorShim* CRC2EncryptorShim::NewL(const TDesC8& aKey, TInt aEffectiveKeyLenBits)

    34 	{

    35 	CRC2EncryptorShim* self = CRC2EncryptorShim::NewLC(aKey, aEffectiveKeyLenBits);

    36 	CleanupStack::Pop(self);

    37 	return self;

    38 	}

    39 

    40 CRC2EncryptorShim* CRC2EncryptorShim::NewLC(const TDesC8& aKey, TInt aEffectiveKeyLenBits)

    41 	{

    42 	CRC2EncryptorShim* self = new (ELeave) CRC2EncryptorShim();

    43 	CleanupStack::PushL(self);

    44 	self->ConstructL(aKey, aEffectiveKeyLenBits);

    45 	// weak enough if either aKey or aEffectiveKeyLenBits is weak

    46 	TInt minKeySize = Min(aEffectiveKeyLenBits, BytesToBits(aKey.Size()));

    47 	TCrypto::IsSymmetricWeakEnoughL(minKeySize);

    48 	return self;

    49 	}

    50 

    51 CRC2EncryptorShim::CRC2EncryptorShim()

    52 	{

    53 	}

    54 

    55 CRC2EncryptorShim::~CRC2EncryptorShim()

    56 	{

    57 	delete iSymmetricCipherImpl;

    58 	delete iKey;	

    59 	delete iAlgorithmParams;

    60 	}	

    61 

    62 void CRC2EncryptorShim::ConstructL(const TDesC8& aKey, TInt aEffectiveKeyLenBits)

    63 	{

    64 	TKeyProperty keyProperty = {KRc2Uid, KNullUid, KSymmetricKeyUid, KNonEmbeddedKeyUid};

    65 	CCryptoParams* keyParam =CCryptoParams::NewLC();

    66 	keyParam->AddL(aKey, KSymmetricKeyParameterUid);

    67 	iKey=CKey::NewL(keyProperty, *keyParam);

    68 	CleanupStack::PopAndDestroy(keyParam);

    69 	

    70 	iAlgorithmParams = CCryptoParams::NewL();

    71 	iAlgorithmParams->AddL(aEffectiveKeyLenBits, KRC2EffectiveKeyLenBits);

    72 	

    73 	CSymmetricCipherFactory::CreateSymmetricCipherL(

    74 											iSymmetricCipherImpl,

    75 											KRc2Uid,

    76 											*iKey,

    77 											KCryptoModeEncryptUid,

    78 											KOperationModeECBUid,

    79 											KPaddingModeNoneUid,

    80 											iAlgorithmParams);

    81 	}		

    82 

    83 TInt CRC2EncryptorShim::BlockSize() const

    84 	{

    85 	// SPI returns block size in BITS

    86 	return BitsToBytes(iSymmetricCipherImpl->BlockSize());

    87 	}	

    88 

    89 TInt CRC2EncryptorShim::KeySize() const

    90 	{

    91 	return iSymmetricCipherImpl->KeySize();

    92 	}	

    93 

    94 void CRC2EncryptorShim::Transform(TDes8& aBlock)

    95 	{

    96 	iOutputBlock.Zero();

    97 	TRAP_IGNORE(iSymmetricCipherImpl->ProcessL(aBlock, iOutputBlock);)

    98 	aBlock = iOutputBlock;

    99 	}

   100 

   101 void CRC2EncryptorShim::Reset()

   102 	{

   103 	iSymmetricCipherImpl->Reset();

   104 	}	

   105 

   106 TInt CRC2EncryptorShim::Extension_(TUint aExtensionId, TAny*& a0, TAny* /*a1*/)

   107 	{

   108 	TInt ret(KErrExtensionNotSupported);

   109 	

   110 	if (KSymmetricCipherInterface == aExtensionId && iSymmetricCipherImpl)

   111 		{

   112 		a0=iSymmetricCipherImpl;

   113 		ret=KErrNone;	

   114 		}		

   115 	return ret;

   116 	}	

   117 

   118 // CRC2DecryptorShim ////////////////////////////////////////////////////////

   119 CRC2DecryptorShim* CRC2DecryptorShim::NewL(const TDesC8& aKey, TInt aEffectiveKeyLenBits)

   120 	{

   121 	CRC2DecryptorShim* self = CRC2DecryptorShim::NewLC(aKey, aEffectiveKeyLenBits);

   122 	CleanupStack::Pop(self);

   123 	return self;

   124 	}

   125 

   126 

   127 CRC2DecryptorShim* CRC2DecryptorShim::NewLC(const TDesC8& aKey, TInt aEffectiveKeyLenBits)

   128 	{

   129 	CRC2DecryptorShim* self = new (ELeave) CRC2DecryptorShim();

   130 	CleanupStack::PushL(self);

   131 	self->ConstructL(aKey, aEffectiveKeyLenBits);

   132 	// weak enough if either aKey or aEffectiveKeyLenBits is weak

   133 	TInt minKeySize = Min(aEffectiveKeyLenBits, BytesToBits(aKey.Size()));

   134 	TCrypto::IsSymmetricWeakEnoughL(minKeySize);

   135 	return self;

   136 	}

   137 

   138 CRC2DecryptorShim::CRC2DecryptorShim()

   139 	{	

   140 	}

   141 

   142 CRC2DecryptorShim::~CRC2DecryptorShim()

   143 	{

   144 	delete iSymmetricCipherImpl;

   145 	delete iKey;

   146 	delete iAlgorithmParams;			

   147 	}

   148 

   149 

   150 void CRC2DecryptorShim::ConstructL(const TDesC8& aKey, TInt aEffectiveKeyLenBits)

   151 	{

   152 	TKeyProperty keyProperty = {KRc2Uid, KNullUid, KSymmetricKeyUid, KNonEmbeddedKeyUid};

   153 	CCryptoParams* keyParam =CCryptoParams::NewLC();

   154 	keyParam->AddL(aKey, KSymmetricKeyParameterUid);

   155 	iKey=CKey::NewL(keyProperty, *keyParam);

   156 	CleanupStack::PopAndDestroy(keyParam);

   157 

   158 	iAlgorithmParams = CCryptoParams::NewL();

   159 	iAlgorithmParams->AddL(aEffectiveKeyLenBits, KRC2EffectiveKeyLenBits);

   160 	

   161 	CSymmetricCipherFactory::CreateSymmetricCipherL(

   162 												iSymmetricCipherImpl,

   163 												KRc2Uid,

   164 												*iKey,

   165 												KCryptoModeDecryptUid,

   166 												KOperationModeECBUid,

   167 												KPaddingModeNoneUid,

   168 												iAlgorithmParams);	

   169 	}	

   170 

   171 TInt CRC2DecryptorShim::BlockSize() const

   172 	{

   173 	// SPI returns block size in BITS

   174 	return BitsToBytes(iSymmetricCipherImpl->BlockSize());

   175 	}

   176 	

   177 TInt CRC2DecryptorShim::KeySize() const

   178 	{

   179 	return iSymmetricCipherImpl->KeySize();

   180 	}	

   181 

   182 void CRC2DecryptorShim::Transform(TDes8& aBlock)

   183 	{

   184 	iOutputBlock.Zero();	

   185 	TRAP_IGNORE(iSymmetricCipherImpl->ProcessL(aBlock, iOutputBlock);)

   186 	aBlock = iOutputBlock;	

   187 	}

   188 

   189 void CRC2DecryptorShim::Reset()

   190 	{

   191 	iSymmetricCipherImpl->Reset();

   192 	}

   193 

   194 TInt CRC2DecryptorShim::Extension_(TUint aExtensionId, TAny*& a0, TAny* /*a1*/)

   195 	{

   196 	TInt ret(KErrExtensionNotSupported);

   197 	

   198 	if (CryptoSpi::KSymmetricCipherInterface == aExtensionId && iSymmetricCipherImpl)

   199 		{

   200 		a0=iSymmetricCipherImpl;

   201 		ret=KErrNone;	

   202 		}		

   203 	return ret;

   204 	}
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