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os/security/crypto/weakcryptospi/source/symmetric/bufferedtransformationshim.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 * blocktransformationshim.cpp

    16 *

    17 */

    18 

    19 

    20 #include "bufferedtransformationshim.h"

    21 

    22 #include <cryptospi/cryptospidef.h>

    23 #include <padding.h>

    24 #include <cryptospi/cryptosymmetriccipherapi.h>

    25 #include <cryptospi/plugincharacteristics.h>

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

    27 

    28 // CBufferedEncryptorShim

    29 CBufferedEncryptorShim::CBufferedEncryptorShim(CryptoSpi::CSymmetricCipher* aSymmetricCipherImpl) :

    30 	iSymmetricCipherImpl(aSymmetricCipherImpl)

    31 	{

    32 	}

    33 

    34 CBufferedEncryptorShim* CBufferedEncryptorShim::NewL(CBlockTransformation* aBT, CPadding* aPadding)

    35 	{

    36 	CBufferedEncryptorShim* self(0);

    37 	

    38 	// Check whether the block transform contains an SPI plug-in

    39 	TAny* implPtr(0);

    40 	TInt err = aBT->GetExtension(CryptoSpi::KSymmetricCipherInterface, implPtr, NULL);	

    41 	if (err == KErrNone && implPtr)

    42 		{

    43 		CryptoSpi::CSymmetricCipher* impl(static_cast<CryptoSpi::CSymmetricCipher*>(implPtr));

    44 		

    45 		const CryptoSpi::TCharacteristics* c(0);

    46 		impl->GetCharacteristicsL(c);

    47 	

    48 		const CryptoSpi::TSymmetricCipherCharacteristics* cipherCharacteristics(

    49 			static_cast<const CryptoSpi::TSymmetricCipherCharacteristics*>(c));

    50 			

    51 		// See if the padding mode is recognised by CryptoSpi and if so, check

    52 		// whether the plug-in supports that padding mode.

    53 		TUid paddingMode;

    54 		TAny* paddingPtr = &paddingMode;		

    55 		err = aPadding->GetExtension(CryptoSpi::KPaddingInterface, paddingPtr, 0);		

    56 		if (err == KErrNone && cipherCharacteristics->IsPaddingModeSupported(paddingMode))

    57 			{

    58 			impl->SetCryptoModeL(CryptoSpi::KCryptoModeEncryptUid);

    59 			impl->SetPaddingModeL(paddingMode);		

    60 			self = new(ELeave) CBufferedEncryptorShim(impl);

    61 			CleanupStack::PushL(self);

    62 			self->ConstructL(aBT, aPadding);

    63 			CleanupStack::Pop(self);

    64 			}

    65 		}				

    66 	return self;

    67 	}

    68 

    69 void CBufferedEncryptorShim::ConstructL(CBlockTransformation* aBT, CPadding* aPadding)

    70 	{

    71 	CBufferedEncryptor::ConstructL(aBT, aPadding);

    72 	}

    73 

    74 void CBufferedEncryptorShim::Process(const TDesC8& aInput, TDes8& aOutput)

    75 	{

    76 	TRAP_IGNORE(iSymmetricCipherImpl->ProcessL(aInput, aOutput);)

    77 	}

    78 	

    79 TInt CBufferedEncryptorShim::MaxOutputLength(TInt aInputLength) const

    80 	{

    81 	return iSymmetricCipherImpl->MaxOutputLength(aInputLength);

    82 	}

    83 	

    84 void CBufferedEncryptorShim::Reset()

    85 	{

    86 	iSymmetricCipherImpl->Reset();

    87 	}

    88 	

    89 TInt CBufferedEncryptorShim::BlockSize() const

    90 	{

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

    92 	}

    93 	

    94 TInt CBufferedEncryptorShim::KeySize() const

    95 	{

    96 	return iSymmetricCipherImpl->KeySize();

    97 	}

    98 	

    99 void CBufferedEncryptorShim::ProcessFinalL(const TDesC8& aInput, TDes8& aOutput)

   100 	{

   101 	iSymmetricCipherImpl->ProcessFinalL(aInput, aOutput);

   102 	}

   103 	

   104 TInt CBufferedEncryptorShim::MaxFinalOutputLength(TInt aInputLength) const

   105 	{

   106 	return iSymmetricCipherImpl->MaxFinalOutputLength(aInputLength);

   107 	}

   108 

   109 // CBufferedDecryptorShim

   110 CBufferedDecryptorShim::CBufferedDecryptorShim(CryptoSpi::CSymmetricCipher* aSymmetricCipherImpl) :

   111 	iSymmetricCipherImpl(aSymmetricCipherImpl)

   112 	{

   113 	}

   114 

   115 CBufferedDecryptorShim* CBufferedDecryptorShim::NewL(CBlockTransformation* aBT, CPadding* aPadding)

   116 	{

   117 	CBufferedDecryptorShim* self(0);

   118 	

   119 	// Check whether the block transform contains an SPI plug-in

   120 	TAny* implPtr(0);

   121 	TInt err = aBT->GetExtension(CryptoSpi::KSymmetricCipherInterface, implPtr, NULL);	

   122 	if (err == KErrNone && implPtr)

   123 		{

   124 		CryptoSpi::CSymmetricCipher* impl(static_cast<CryptoSpi::CSymmetricCipher*>(implPtr));

   125 		

   126 		const CryptoSpi::TCharacteristics* c(0);

   127 		impl->GetCharacteristicsL(c);

   128 	

   129 		const CryptoSpi::TSymmetricCipherCharacteristics* cipherCharacteristics(

   130 			static_cast<const CryptoSpi::TSymmetricCipherCharacteristics*>(c));

   131 			

   132 		// See if the padding mode is recognised by CryptoSpi and if so, check

   133 		// whether the plug-in supports that padding mode.

   134 		TUid paddingMode;

   135 		TAny* paddingPtr = &paddingMode;		

   136 		err = aPadding->GetExtension(CryptoSpi::KPaddingInterface, paddingPtr, 0);		

   137 		if (err == KErrNone && cipherCharacteristics->IsPaddingModeSupported(paddingMode))

   138 			{

   139 			impl->SetCryptoModeL(CryptoSpi::KCryptoModeDecryptUid);			

   140 			impl->SetPaddingModeL(paddingMode);

   141 			

   142 			self = new(ELeave) CBufferedDecryptorShim(impl);

   143 			CleanupStack::PushL(self);

   144 			self->ConstructL(aBT, aPadding);

   145 			CleanupStack::Pop(self);

   146 			}

   147 		}				

   148 	return self;

   149 	}

   150 

   151 void CBufferedDecryptorShim::ConstructL(CBlockTransformation* aBT, CPadding* aPadding)

   152 	{

   153 	CBufferedDecryptor::ConstructL(aBT, aPadding);

   154 	}

   155 

   156 void CBufferedDecryptorShim::Process(const TDesC8& aInput, TDes8& aOutput)

   157 	{

   158 	TRAP_IGNORE(iSymmetricCipherImpl->ProcessL(aInput, aOutput);)

   159 	}

   160 	

   161 TInt CBufferedDecryptorShim::MaxOutputLength(TInt aInputLength) const

   162 	{

   163 	return iSymmetricCipherImpl->MaxOutputLength(aInputLength);

   164 	}

   165 	

   166 void CBufferedDecryptorShim::Reset()

   167 	{

   168 	iSymmetricCipherImpl->Reset();

   169 	}

   170 	

   171 TInt CBufferedDecryptorShim::BlockSize() const

   172 	{

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

   174 	}

   175 	

   176 TInt CBufferedDecryptorShim::KeySize() const

   177 	{

   178 	return iSymmetricCipherImpl->KeySize();

   179 	}

   180 	

   181 void CBufferedDecryptorShim::ProcessFinalL(const TDesC8& aInput, TDes8& aOutput)

   182 	{

   183 	iSymmetricCipherImpl->ProcessFinalL(aInput, aOutput);

   184 	}

   185 	

   186 TInt CBufferedDecryptorShim::MaxFinalOutputLength(TInt aInputLength) const

   187 	{

   188 	return iSymmetricCipherImpl->MaxFinalOutputLength(aInputLength);

   189 	}
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