rtp/srtpstack/inc/msrtpauthentication.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Tue, 02 Feb 2010 01:03:15 +0200
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/*
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* Copyright (c) 2004 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 "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:    Provides an abstract class for authentication (integrity protection)
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*
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*/
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#ifndef __MSRTP_AUTHENTICATION_H__
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#define __MSRTP_AUTHENTICATION_H__
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#include <e32base.h>
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class MSRTPAuthentication
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    {
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    public:
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        /**
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        * This function is called by SRTP for authentication/integrity protection
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        * to create authentication tag regardless of the algorithm, 
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        * the default algorith is HMAC-SHA1.
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        * Produces authentication tag based on input key and data M.
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        * result IS truncated to n_tag leftmost bits
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        * @param aBitLength  authentication tag length, 32 or 80 bits
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        * @param aKey  authentication key (n_a)
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        * @param aAuthPortion data to be integrity protected 
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        * @param aRoc packet ROC 
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	    * Returns HBufC8* authentication tag (untruncated) 
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        */
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        virtual HBufC8* AuthenticateL(TUint aBitLength,
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                                    const TDesC8& aKey, 
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                                    const TDesC8& aAuthPortion,
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                                    const TDesC8& aRoc) = 0;
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        virtual ~MSRTPAuthentication() { };                                
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    };
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#endif // __MSRTP_AUTHENTICATION_H__