/*+
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* Copyright (c) 2007-2009 Nokia Corporation and/or its subsidiary(-ies).+
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* All rights reserved.+
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* This component and the accompanying materials are made available+
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* under the terms of the License "Eclipse Public License v1.0"+
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* which accompanies this distribution, and is available+
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".+
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*+
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* Initial Contributors:+
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* Nokia Corporation - initial contribution.+
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*+
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* Contributors:+
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*+
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* Description: +
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*+
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*/+
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+
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/**+
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 @file+
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 @internalTechnology+
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*/+
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 +
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#include "symmetriccipherstepbase.h"+
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#include <bigint.h>+
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+
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+
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/**+
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Common setup of a crypto SPI symmetric cipher.+
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@param aArc4Check Determines whether the check is run on the cipher type for ARC4 and if it matches, sets up the CCryptoParams accordingly.+
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@param aRc2Check Determines whether the check is run on the cipher type for RC2 and if it matches, sets up the CCryptoParams accordingly.+
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@param aOperationMode On return is the operation mode read in from the config file and used in the initial setup of the cipher.+
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@param aCipher On return the symmetric cipher implementation.+
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@param aKey On return aCipher's key object.  This is should not be deleted until after aCipher is deleted.+
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@return The error value from the call to the symmetric cipher creation function.+
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*/+
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void CSymmetricCipherStepBase::SetupCipherL(TBool aArc4Check, TBool aRc2Check, TVariantPtrC& aOperationMode, CSymmetricCipher*& aCipher, CKey*& aKey)+
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	{	+
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	TPtrC keyPath;+
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	TVariantPtrC algorithm;+
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	TVariantPtrC paddingMode;+
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		+
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	if(	!GetStringFromConfig(ConfigSection(),KConfigEncryptKey, keyPath) ||+
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		!GetStringFromConfig(ConfigSection(),KConfigAlgorithmUid, algorithm) || +
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		!GetStringFromConfig(ConfigSection(),KConfigOperationMode, aOperationMode) ||+
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		!GetStringFromConfig(ConfigSection(),KConfigPaddingMode, paddingMode ))+
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		{+
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		User::Leave(KErrNotFound);+
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		}+
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	+
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	// Create key +
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	TKeyProperty keyProperty;+
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	CCryptoParams* params = CCryptoParams::NewLC(); +
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	+
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	CFileReader* keyData = CFileReader::NewLC(keyPath);+
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	params->AddL( *keyData, KSymmetricKeyParameterUid);+
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	+
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	aKey=CKey::NewL(keyProperty, *params);+
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	CleanupStack::PushL(aKey);+
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+
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	CCryptoParams* xparams = NULL;	+
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	if ((aArc4Check) && (TUid(algorithm) == KArc4Uid))+
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		{+
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		// Set the RC4 DiscardBytes to 0+
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		xparams = CCryptoParams::NewLC();+
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		xparams->AddL(NULL, KARC4DiscardBytes);+
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		+
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		// Create a Symmetric Cipher with the values from the ini file+
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		CSymmetricCipherFactory::CreateSymmetricCipherL(aCipher, algorithm, *aKey, KCryptoModeEncryptUid, aOperationMode, paddingMode, xparams);+
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		CleanupStack::PopAndDestroy(xparams);+
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		CleanupStack::Pop(aKey);+
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		CleanupStack::PopAndDestroy(2, params);+
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		}+
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	else if ((aRc2Check) && (TUid(algorithm) == KRc2Uid))+
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		{+
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		TInt keylen = TPtrC8(*keyData).Length() * 8;+
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		xparams = CCryptoParams::NewLC();+
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				+
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		// Set the RC2 EffectiveKeyLen according to the input key size+
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		xparams->AddL( keylen, KRC2EffectiveKeyLenBits);+
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		+
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		// Create a Symmetric Cipher with the values from the ini file+
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		CSymmetricCipherFactory::CreateSymmetricCipherL(aCipher, algorithm, *aKey, KCryptoModeEncryptUid, aOperationMode, paddingMode, xparams);+
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		CleanupStack::PopAndDestroy(xparams);+
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		CleanupStack::Pop(aKey);+
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		CleanupStack::PopAndDestroy(2, params);+
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		}+
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	else+
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		{+
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		// Create a Symmetric Cipher with the values from the ini file+
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		CSymmetricCipherFactory::CreateSymmetricCipherL(aCipher, algorithm, *aKey, KCryptoModeEncryptUid, aOperationMode, paddingMode, xparams);+
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		CleanupStack::Pop(aKey);+
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		CleanupStack::PopAndDestroy(2, params);+
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		}+
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	}+
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	+
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+
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/**+
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When running in CTR mode call this function to calculate the block size of a cipher.+
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@param aCipher The cipher whose block size is returned.+
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@return The block size in bits.+
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*/	+
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TInt CSymmetricCipherStepBase::CtrModeCalcBlockSizeL(CSymmetricCipher& aCipher)+
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	{+
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  	// aCipher MUST be running in CTR mode+
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	aCipher.SetOperationModeL(KOperationModeCBCUid);+
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	TInt blockSize = aCipher.BlockSize();+
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	aCipher.SetOperationModeL(KOperationModeCTRUid);+
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	return blockSize;	+
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	}+
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+
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	+
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/**+
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Read in the plaintext from the course file listed in the configuration file.+
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@param aPlaintext Descriptor pointing to the plaintext.+
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@param aReader This CFileReader pointer must be NULL when passed in. It must not be deleted until after the client has finished with the plaintext.+
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*/	+
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HBufC8* CSymmetricCipherStepBase::ReadInPlaintextL()+
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	{+
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	TPtrC plaintextPath;+
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	if(!GetStringFromConfig(ConfigSection(),KConfigSourcePath, plaintextPath))+
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		{+
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		User::Leave(KErrNotFound);+
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		}+
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	+
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	return ReadFileL(plaintextPath);+
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	}+
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+
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+
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/**+
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Read in the ciphertext from the course file listed in the configuration file.+
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@param aCiphertext Descriptor pointing to the ciphertext.+
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@param aReader This CFileReader pointer must be NULL when passed in. It must not be deleted until after the client has finished with the ciphertext.+
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+
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*/+
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HBufC8* CSymmetricCipherStepBase::ReadInCiphertextL()+
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	{+
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	TPtrC ciphertextPath;+
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	if(!GetStringFromConfig(ConfigSection(),KConfigEncryptedPath, ciphertextPath))+
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		{+
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		User::Leave(KErrNotFound);+
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		}+
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+
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	return ReadFileL(ciphertextPath);+
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	}+
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+
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+
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/**+
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Read in the IV from the course file listed in the configuration file.+
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@param aIV Descriptor pointing to the IV.+
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@param aReader This CFileReader pointer must be NULL when passed in. It must not be deleted until after the client has finished with the IV.+
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+
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*/+
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HBufC8* CSymmetricCipherStepBase::ReadInIvL()+
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	{+
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	TPtrC ivPath;+
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	if(!GetStringFromConfig(ConfigSection(),KConfigIVPath, ivPath))+
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		{+
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		User::Leave(KErrNotFound);+
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		}+
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+
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	return ReadFileL(ivPath);+
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	}+
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	+
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	+
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/**+
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@param aCounter+
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*/	+
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HBufC8* CSymmetricCipherStepBase::CtrModeIncrementCounterL(TDesC8& aCounter)+
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	{+
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	RInteger bigInt = RInteger::NewL(aCounter);+
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	CleanupClosePushL(bigInt);+
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	++bigInt;+
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	HBufC8* result = bigInt.BufferLC();+
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	CleanupStack::Pop(result);+
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	CleanupStack::PopAndDestroy();+
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	return result;+
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	}+
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+
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HBufC8* CSymmetricCipherStepBase::ReadInHexCiphertextL()+
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	{+
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	HBufC8* hex = ReadInCiphertextL();+
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	CleanupStack::PushL(hex);+
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	HBufC8* result = ConvertFromHexFormatToRawL((*hex));+
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	CleanupStack::PopAndDestroy(hex);+
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	return result;+
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	}+
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	+
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HBufC8* CSymmetricCipherStepBase::ReadInHexPlaintextL()+
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	{+
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	HBufC8* hex = ReadInPlaintextL();+
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	CleanupStack::PushL(hex);+
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	HBufC8* result = ConvertFromHexFormatToRawL((*hex));+
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	CleanupStack::PopAndDestroy(hex);+
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	return result;+
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	}	+
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+
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HBufC8* CSymmetricCipherStepBase::ReadInHexPlainTextL(TPtrC aFile)+
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	{+
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	HBufC8* data = ReadFileL(aFile);+
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	CleanupStack::PushL(data);+
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	HBufC8* result = ConvertFromHexFormatToRawL(*data);+
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	CleanupStack::PopAndDestroy(data);+
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	return result;+
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	}	+
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+
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HBufC8* CSymmetricCipherStepBase::ReadFileL(TPtrC aFile)+
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	{+
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	CFileReader* reader = CFileReader::NewL(aFile);+
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	CleanupStack::PushL(reader);+
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	TPtrC8 ptr(*reader);+
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	HBufC8* fileData = ptr.AllocL();+
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	CleanupStack::PopAndDestroy(reader);+
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	return fileData;+
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	}+
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+
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HBufC8* CSymmetricCipherStepBase::ReadInHexIvL()+
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	{+
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	HBufC8* hex = ReadInIvL();+
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	CleanupStack::PushL(hex);+
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	HBufC8* result = ConvertFromHexFormatToRawL((*hex));+
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	CleanupStack::PopAndDestroy(hex);+
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	return result;+
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	}+
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+
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HBufC8* CSymmetricCipherStepBase::ConvertFromHexFormatToRawL(TDesC8& aInput)+
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	{+
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	TBuf8<2> hexPair;+
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	HBufC8* result = HBufC8::NewLC(aInput.Length()/2);+
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	TUint8 val;+
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			+
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	for(TInt i = 0 ; i < aInput.Length()-1 ; i+=2)+
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		{+
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		hexPair = aInput.Mid(i,2);+
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		TLex8 lex(hexPair);+
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		User::LeaveIfError(lex.Val(val, EHex));+
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		result->Des().Append(val);			+
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		}+
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	CleanupStack::Pop(result);+
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	return result;	+
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	}+
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