sl@0: /*
sl@0: * Copyright (c) 2006-2010 Nokia Corporation and/or its subsidiary(-ies).
sl@0: * All rights reserved.
sl@0: * This component and the accompanying materials are made available
sl@0: * under the terms of the License "Eclipse Public License v1.0"
sl@0: * which accompanies this distribution, and is available
sl@0: * at the URL "http://www.eclipse.org/legal/epl-v10.html".
sl@0: *
sl@0: * Initial Contributors:
sl@0: * Nokia Corporation - initial contribution.
sl@0: *
sl@0: * Contributors:
sl@0: *
sl@0: * Description: 
sl@0: *
sl@0: */
sl@0: 
sl@0: 
sl@0: #include "cbcmodeshim.h"
sl@0: 
sl@0: #include <cryptopanic.h>
sl@0: #include <cryptospi/cryptospidef.h>
sl@0: #include <padding.h>
sl@0: #include <cryptospi/cryptosymmetriccipherapi.h>
sl@0: #include <cryptospi/plugincharacteristics.h>
sl@0: #include "../common/inlines.h"
sl@0: 
sl@0: // CModeCBCEncryptorShim
sl@0: CModeCBCEncryptorShim::CModeCBCEncryptorShim(CryptoSpi::CSymmetricCipher* aSymmetricCipherImpl) :
sl@0: 	iSymmetricCipherImpl(aSymmetricCipherImpl)
sl@0: 	{
sl@0: 	}
sl@0: 
sl@0: CModeCBCEncryptorShim* CModeCBCEncryptorShim::NewL(CBlockTransformation* aBT, const TDesC8& aIv)
sl@0: 	{
sl@0: 	CModeCBCEncryptorShim* self(0);
sl@0: 	
sl@0: 	// Check whether the block transform contains an SPI plug-in
sl@0: 	TAny* implPtr(0);
sl@0: 	TInt err = aBT->GetExtension(CryptoSpi::KSymmetricCipherInterface, implPtr, NULL);	
sl@0: 	if (err == KErrNone && implPtr)
sl@0: 		{
sl@0: 		CryptoSpi::CSymmetricCipher* impl(static_cast<CryptoSpi::CSymmetricCipher*>(implPtr));
sl@0: 		
sl@0: 		const CryptoSpi::TCharacteristics* c(0);
sl@0: 		impl->GetCharacteristicsL(c);
sl@0: 	
sl@0: 		const CryptoSpi::TSymmetricCipherCharacteristics* cipherCharacteristics(
sl@0: 			static_cast<const CryptoSpi::TSymmetricCipherCharacteristics*>(c));
sl@0: 			
sl@0: 		// Verify that the plug-in supports CBC mode
sl@0: 		if (err == KErrNone && 
sl@0: 			cipherCharacteristics->IsOperationModeSupported(CryptoSpi::KOperationModeCBCUid))
sl@0: 			{
sl@0: 			// Set block transform to encrypt-cbc
sl@0: 			impl->SetCryptoModeL(CryptoSpi::KCryptoModeEncryptUid);
sl@0: 			impl->SetOperationModeL(CryptoSpi::KOperationModeCBCUid);
sl@0: 			impl->SetIvL(aIv);		
sl@0: 			self = new(ELeave) CModeCBCEncryptorShim(impl);
sl@0: 			CleanupStack::PushL(self);
sl@0: 			self->ConstructL(aBT, aIv);
sl@0: 			CleanupStack::Pop(self);
sl@0: 			}
sl@0: 		}				
sl@0: 	return self;
sl@0: 	}
sl@0: 
sl@0: void CModeCBCEncryptorShim::ConstructL(CBlockTransformation* aBT, const TDesC8& aIv)
sl@0: 	{
sl@0: 	CModeCBCEncryptor::ConstructL(aBT, aIv);
sl@0: 	}
sl@0: 
sl@0: void CModeCBCEncryptorShim::Reset()
sl@0: 	{
sl@0: 	iSymmetricCipherImpl->Reset();
sl@0: 	}
sl@0: 	
sl@0: TInt CModeCBCEncryptorShim::BlockSize() const
sl@0: 	{
sl@0: 	return BitsToBytes(iSymmetricCipherImpl->BlockSize());
sl@0: 	}
sl@0: 	
sl@0: TInt CModeCBCEncryptorShim::KeySize() const
sl@0: 	{
sl@0: 	return iSymmetricCipherImpl->KeySize();
sl@0: 	}
sl@0: 	
sl@0: void CModeCBCEncryptorShim::Transform(TDes8& aBlock) 
sl@0: 	{
sl@0: 	// This function will never get called if a buffered
sl@0: 	// encryptor is used because Process and ProcessFinalL call
sl@0: 	// iSymmetricCipherImpl directly
sl@0: 	iBT->Transform(aBlock);	
sl@0: 	}
sl@0: 	
sl@0: void CModeCBCEncryptorShim::SetIV(const TDesC8& aIv)
sl@0: 	{
sl@0: 	TRAPD(err, iSymmetricCipherImpl->SetIvL(aIv));
sl@0: 	if (err == KErrOverflow)
sl@0: 		{
sl@0: 		User::Panic(KCryptoPanic, ECryptoPanicInputTooLarge);
sl@0: 		}
sl@0: 	else if (err != KErrNone)
sl@0: 		{
sl@0: 		// SetIvL should only leave if the aIv is incorrect
sl@0: 		User::Panic(KCryptoPanic, KErrArgument);
sl@0: 		}
sl@0: 	}
sl@0: 
sl@0: TInt CModeCBCEncryptorShim::Extension_(TUint aExtensionId, TAny*& a0, TAny* /*a1*/)
sl@0: 	{
sl@0: 	TInt ret(KErrExtensionNotSupported);
sl@0: 	
sl@0: 	if (CryptoSpi::KSymmetricCipherInterface == aExtensionId)
sl@0: 		{		
sl@0: 		a0=iSymmetricCipherImpl;
sl@0: 		ret=KErrNone;	
sl@0: 		}		
sl@0: 	return ret;
sl@0: 	}		
sl@0: 
sl@0: // CModeCBCDecryptorShim
sl@0: CModeCBCDecryptorShim::CModeCBCDecryptorShim(CryptoSpi::CSymmetricCipher* aSymmetricCipherImpl) :
sl@0: 	iSymmetricCipherImpl(aSymmetricCipherImpl)
sl@0: 	{
sl@0: 	}
sl@0: 
sl@0: CModeCBCDecryptorShim* CModeCBCDecryptorShim::NewL(CBlockTransformation* aBT, const TDesC8& aIv)
sl@0: 	{
sl@0: 	CModeCBCDecryptorShim* self(0);
sl@0: 	
sl@0: 	// Check whether the block transform contains an SPI plug-in
sl@0: 	TAny* implPtr(0);
sl@0: 	TInt err = aBT->GetExtension(CryptoSpi::KSymmetricCipherInterface, implPtr, NULL);	
sl@0: 	if (err == KErrNone && implPtr)
sl@0: 		{
sl@0: 		CryptoSpi::CSymmetricCipher* impl(static_cast<CryptoSpi::CSymmetricCipher*>(implPtr));
sl@0: 		
sl@0: 		const CryptoSpi::TCharacteristics* c(0);
sl@0: 		impl->GetCharacteristicsL(c);
sl@0: 	
sl@0: 		const CryptoSpi::TSymmetricCipherCharacteristics* cipherCharacteristics(
sl@0: 			static_cast<const CryptoSpi::TSymmetricCipherCharacteristics*>(c));
sl@0: 			
sl@0: 		// Verify that the plug-in supports CBC mode
sl@0: 		if (err == KErrNone && 
sl@0: 			cipherCharacteristics->IsOperationModeSupported(CryptoSpi::KOperationModeCBCUid))
sl@0: 			{
sl@0: 			// Set block transform to encrypt-cbc
sl@0: 			impl->SetCryptoModeL(CryptoSpi::KCryptoModeDecryptUid);
sl@0: 			impl->SetOperationModeL(CryptoSpi::KOperationModeCBCUid);
sl@0: 			impl->SetIvL(aIv);				
sl@0: 			self = new(ELeave) CModeCBCDecryptorShim(impl);
sl@0: 			CleanupStack::PushL(self);
sl@0: 			self->ConstructL(aBT, aIv);
sl@0: 			CleanupStack::Pop(self);
sl@0: 			}
sl@0: 		}				
sl@0: 	return self;
sl@0: 	}
sl@0: 
sl@0: void CModeCBCDecryptorShim::ConstructL(CBlockTransformation* aBT, const TDesC8& aIv)
sl@0: 	{
sl@0: 	CModeCBCDecryptor::ConstructL(aBT, aIv);
sl@0: 	}
sl@0: 	
sl@0: void CModeCBCDecryptorShim::Reset()
sl@0: 	{
sl@0: 	iSymmetricCipherImpl->Reset();
sl@0: 	}
sl@0: 	
sl@0: TInt CModeCBCDecryptorShim::BlockSize() const
sl@0: 	{
sl@0: 	return BitsToBytes(iSymmetricCipherImpl->BlockSize());
sl@0: 	}
sl@0: 	
sl@0: TInt CModeCBCDecryptorShim::KeySize() const
sl@0: 	{
sl@0: 	return iSymmetricCipherImpl->KeySize();
sl@0: 	}
sl@0: 
sl@0: void CModeCBCDecryptorShim::Transform(TDes8& aBlock) 
sl@0: 	{
sl@0: 	// This function will never get called if a buffered
sl@0: 	// encryptor is used because Process and ProcessFinalL call
sl@0: 	// iSymmetricCipherImpl directly
sl@0: 	iBT->Transform(aBlock);	
sl@0: 	}
sl@0: 
sl@0: void CModeCBCDecryptorShim::SetIV(const TDesC8& aIv)
sl@0: 	{
sl@0: 	TRAPD(err, iSymmetricCipherImpl->SetIvL(aIv));
sl@0: 	if (err == KErrOverflow)
sl@0: 		{
sl@0: 		User::Panic(KCryptoPanic, ECryptoPanicInputTooLarge);
sl@0: 		}
sl@0: 	else if (err != KErrNone)
sl@0: 		{
sl@0: 		// SetIvL should only leave if the aIv is incorrect
sl@0: 		User::Panic(KCryptoPanic, KErrArgument);
sl@0: 		}
sl@0: 	}
sl@0: 	
sl@0: TInt CModeCBCDecryptorShim::Extension_(TUint aExtensionId, TAny*& a0, TAny* /*a1*/)
sl@0: 	{
sl@0: 	TInt ret(KErrExtensionNotSupported);
sl@0: 	
sl@0: 	if (CryptoSpi::KSymmetricCipherInterface == aExtensionId)
sl@0: 		{		
sl@0: 		a0=iSymmetricCipherImpl;
sl@0: 		ret=KErrNone;	
sl@0: 		}		
sl@0: 	return ret;
sl@0: 	}