crypto/weakcryptospi/inc/spi/symmetriccipherplugin.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Thu, 10 Sep 2009 14:01:51 +0300
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/*
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* Copyright (c) 2006-2009 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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* symmetric cipher abstract interface
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*
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*/
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/**
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 @file
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 @publishedPartner
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 @released
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*/
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#ifndef __CRYPTOAPI_SYMMETRICCIPHER_H__
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#define __CRYPTOAPI_SYMMETRICCIPHER_H__
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#include <cryptospi/cryptoplugin.h>
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namespace CryptoSpi
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	{
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	class CKey;
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	/**
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	The Symmetric Cipher Base definition. Intended to allow plug-ins
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	to implement extensible symmetric cipher functionality, and to work with all
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	known existing symmetric algorithms, e.g. DES, 3DES, ADES, RC2, ARC4 etc
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	*/
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	class MSymmetricCipherBase : public MPlugin
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		{
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	public:
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		/**
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		Set the key of this cipher. Reset() is called to reinitialise the cipher.
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		@param aKey	The symmetric key.
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		*/
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		virtual void SetKeyL(const CKey& aKey) = 0;
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		/**
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		Set the operation mode of this cipher
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		@param aOperationMode	The operation mode e.g. CBC, ECB etc
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		*/
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		virtual void SetOperationModeL(TUid aOperationMode) = 0;
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		/**
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		Set the crypto mode of this cipher. Reset() is called to reinitialise the cipher.
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		@param aCryptoMode	The crypto mode e.g encryption, decryption
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		*/
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		virtual void SetCryptoModeL(TUid aCryptoMode) = 0;
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		/**
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		Set padding Mode of this cipher. Reset() is called to reinitialise the cipher.
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		@param aPaddingMode	The padding mode e.g. SSLv3, PKCS7
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		*/
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		virtual void SetPaddingModeL(TUid aPaddingMode) = 0;
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		/**
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		Set the initialization vector of this cipher. Reset() is called to reinitialise the cipher.
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		@param aIv	The initialization vector.
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		*/
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		virtual void SetIvL(const TDesC8& aIv) = 0;
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		/**
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		Returns the maximum length that an output buffer would need to be in order to hold the result
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		of the next process operation, given the input length aInputLength and the internal
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		state of the state of the cipher.
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		@param aInputLength	The length of the input to process
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		@return The length of the output buffer
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		*/
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		virtual TInt MaxOutputLength(TInt aInputLength) const = 0;
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		/**
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		Returns the maximum length that an output buffer would need to be in order to hold the result
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		of the final processing operation, given the input length aInputLength and the
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		internal state of the cipher.
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		@param aInputLength	The length of input to process
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		@return The length of the output buffer
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		*/
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		virtual TInt MaxFinalOutputLength(TInt aInputLength) const = 0;
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		/**
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		Returns the block size in bits. For stream ciphers (e.g. ARC4) the block size
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		is defined to be 8 bits.
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		@return The block size in bits
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		*/
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		virtual TInt BlockSize() const = 0;
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		/**
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		Returns the size of the current key in bits.
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		@return The size of the current key in bits
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		*/
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		virtual TInt KeySize() const = 0;
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		};
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	class MSymmetricCipher : public MSymmetricCipherBase
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		{
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	public:
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		/**
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		Encrypts or decrypts aInput and appends the result to aOutput.
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		@param aInput	The input data to be processed.
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		@param aOutput	The resulting processed data appended to aOutput.		
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		*/
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		virtual void ProcessL(const TDesC8& aInput, TDes8& aOutput) = 0;
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		/**
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		Pads aInput to be block aligned using the underlying padding system, then
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		encrypts or decrypts the input data, and appends the result to aOutput
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		@param aInput  The input buffer to be encrypted or decrypted.
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		@param aOutput The resulting, padded, processed data is appended to aOutput.
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		*/
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		virtual void ProcessFinalL(const TDesC8& aInput, TDes8& aOutput) = 0;
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		};
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	class MAsyncSymmetricCipher : public MSymmetricCipherBase
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		{
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	public:
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		/**
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		Encrypts or decrypts aInput and appends the result to aOutput asynchronously
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		@param aInput	The input data to be processed.
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		@param aOutput	The resulting processed data appended to aOutput.		
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		@param aRequestStatus
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		*/
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		virtual void ProcessL(const TDesC8& aInput, TDes8& aOutput, TRequestStatus& aRequestStatus) = 0;
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		/**
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		Asynchronously Pads aInput to be block aligned using the underlying padding system, the
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		encrypts or decrypts the input data, and appends the result to aOutput
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		@param aInput  The input buffer to be encrypted or decrypted.
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		@param aOutput The resulting, padded, processed data is appended to aOutput.
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		@param aRequestStatus
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		*/
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		virtual void ProcessFinalL(const TDesC8& aInput, TDes8& aOutput, TRequestStatus& aRequestStatus) = 0;
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		/**
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		Cancel the outstanding request
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		*/
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		virtual void Cancel() = 0;
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		};
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	} // namespace CryptoSpi
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#endif //__CRYPTOAPI_SYMMETRICCIPHER_H__