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os/security/crypto/weakcryptospi/source/symmetric/cbcmodeshim.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 "cbcmodeshim.h"

    20 

    21 #include <cryptopanic.h>

    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 // CModeCBCEncryptorShim

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

    30 	iSymmetricCipherImpl(aSymmetricCipherImpl)

    31 	{

    32 	}

    33 

    34 CModeCBCEncryptorShim* CModeCBCEncryptorShim::NewL(CBlockTransformation* aBT, const TDesC8& aIv)

    35 	{

    36 	CModeCBCEncryptorShim* 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 		// Verify that the plug-in supports CBC mode

    52 		if (err == KErrNone && 

    53 			cipherCharacteristics->IsOperationModeSupported(CryptoSpi::KOperationModeCBCUid))

    54 			{

    55 			// Set block transform to encrypt-cbc

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

    57 			impl->SetOperationModeL(CryptoSpi::KOperationModeCBCUid);

    58 			impl->SetIvL(aIv);		

    59 			self = new(ELeave) CModeCBCEncryptorShim(impl);

    60 			CleanupStack::PushL(self);

    61 			self->ConstructL(aBT, aIv);

    62 			CleanupStack::Pop(self);

    63 			}

    64 		}				

    65 	return self;

    66 	}

    67 

    68 void CModeCBCEncryptorShim::ConstructL(CBlockTransformation* aBT, const TDesC8& aIv)

    69 	{

    70 	CModeCBCEncryptor::ConstructL(aBT, aIv);

    71 	}

    72 

    73 void CModeCBCEncryptorShim::Reset()

    74 	{

    75 	iSymmetricCipherImpl->Reset();

    76 	}

    77 	

    78 TInt CModeCBCEncryptorShim::BlockSize() const

    79 	{

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

    81 	}

    82 	

    83 TInt CModeCBCEncryptorShim::KeySize() const

    84 	{

    85 	return iSymmetricCipherImpl->KeySize();

    86 	}

    87 	

    88 void CModeCBCEncryptorShim::Transform(TDes8& aBlock) 

    89 	{

    90 	// This function will never get called if a buffered

    91 	// encryptor is used because Process and ProcessFinalL call

    92 	// iSymmetricCipherImpl directly

    93 	iBT->Transform(aBlock);	

    94 	}

    95 	

    96 void CModeCBCEncryptorShim::SetIV(const TDesC8& aIv)

    97 	{

    98 	TRAPD(err, iSymmetricCipherImpl->SetIvL(aIv));

    99 	if (err == KErrOverflow)

   100 		{

   101 		User::Panic(KCryptoPanic, ECryptoPanicInputTooLarge);

   102 		}

   103 	else if (err != KErrNone)

   104 		{

   105 		// SetIvL should only leave if the aIv is incorrect

   106 		User::Panic(KCryptoPanic, KErrArgument);

   107 		}

   108 	}

   109 

   110 TInt CModeCBCEncryptorShim::Extension_(TUint aExtensionId, TAny*& a0, TAny* /*a1*/)

   111 	{

   112 	TInt ret(KErrExtensionNotSupported);

   113 	

   114 	if (CryptoSpi::KSymmetricCipherInterface == aExtensionId)

   115 		{		

   116 		a0=iSymmetricCipherImpl;

   117 		ret=KErrNone;	

   118 		}		

   119 	return ret;

   120 	}		

   121 

   122 // CModeCBCDecryptorShim

   123 CModeCBCDecryptorShim::CModeCBCDecryptorShim(CryptoSpi::CSymmetricCipher* aSymmetricCipherImpl) :

   124 	iSymmetricCipherImpl(aSymmetricCipherImpl)

   125 	{

   126 	}

   127 

   128 CModeCBCDecryptorShim* CModeCBCDecryptorShim::NewL(CBlockTransformation* aBT, const TDesC8& aIv)

   129 	{

   130 	CModeCBCDecryptorShim* self(0);

   131 	

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

   133 	TAny* implPtr(0);

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

   135 	if (err == KErrNone && implPtr)

   136 		{

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

   138 		

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

   140 		impl->GetCharacteristicsL(c);

   141 	

   142 		const CryptoSpi::TSymmetricCipherCharacteristics* cipherCharacteristics(

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

   144 			

   145 		// Verify that the plug-in supports CBC mode

   146 		if (err == KErrNone && 

   147 			cipherCharacteristics->IsOperationModeSupported(CryptoSpi::KOperationModeCBCUid))

   148 			{

   149 			// Set block transform to encrypt-cbc

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

   151 			impl->SetOperationModeL(CryptoSpi::KOperationModeCBCUid);

   152 			impl->SetIvL(aIv);				

   153 			self = new(ELeave) CModeCBCDecryptorShim(impl);

   154 			CleanupStack::PushL(self);

   155 			self->ConstructL(aBT, aIv);

   156 			CleanupStack::Pop(self);

   157 			}

   158 		}				

   159 	return self;

   160 	}

   161 

   162 void CModeCBCDecryptorShim::ConstructL(CBlockTransformation* aBT, const TDesC8& aIv)

   163 	{

   164 	CModeCBCDecryptor::ConstructL(aBT, aIv);

   165 	}

   166 	

   167 void CModeCBCDecryptorShim::Reset()

   168 	{

   169 	iSymmetricCipherImpl->Reset();

   170 	}

   171 	

   172 TInt CModeCBCDecryptorShim::BlockSize() const

   173 	{

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

   175 	}

   176 	

   177 TInt CModeCBCDecryptorShim::KeySize() const

   178 	{

   179 	return iSymmetricCipherImpl->KeySize();

   180 	}

   181 

   182 void CModeCBCDecryptorShim::Transform(TDes8& aBlock) 

   183 	{

   184 	// This function will never get called if a buffered

   185 	// encryptor is used because Process and ProcessFinalL call

   186 	// iSymmetricCipherImpl directly

   187 	iBT->Transform(aBlock);	

   188 	}

   189 

   190 void CModeCBCDecryptorShim::SetIV(const TDesC8& aIv)

   191 	{

   192 	TRAPD(err, iSymmetricCipherImpl->SetIvL(aIv));

   193 	if (err == KErrOverflow)

   194 		{

   195 		User::Panic(KCryptoPanic, ECryptoPanicInputTooLarge);

   196 		}

   197 	else if (err != KErrNone)

   198 		{

   199 		// SetIvL should only leave if the aIv is incorrect

   200 		User::Panic(KCryptoPanic, KErrArgument);

   201 		}

   202 	}

   203 	

   204 TInt CModeCBCDecryptorShim::Extension_(TUint aExtensionId, TAny*& a0, TAny* /*a1*/)

   205 	{

   206 	TInt ret(KErrExtensionNotSupported);

   207 	

   208 	if (CryptoSpi::KSymmetricCipherInterface == aExtensionId)

   209 		{		

   210 		a0=iSymmetricCipherImpl;

   211 		ret=KErrNone;	

   212 		}		

   213 	return ret;

   214 	}
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