rtp/srtpstack/src/tsrtpstreaminstatenormal.cpp
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) 2005 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:    implementation
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*
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*/
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#include "tsrtpstreaminstatenormal.h"
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#include "msrtpstreamincontext.h"
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#include "msrtpcryptohandlercontext.h"
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#include "msrtpcryptohandlercontextrtp.h"
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#include "msrtpcryptohandlercontextrtcp.h"
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#include "srtputils.h"
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// ----------------------------------------------------------------------------
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// TSRTPStreamInStateNormal::TSRTPStreamInStateNormal
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// ----------------------------------------------------------------------------
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//
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TSRTPStreamInStateNormal::TSRTPStreamInStateNormal(
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    MSRTPStreamInContext& aStreamContext,
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    MSRTPCryptoHandlerContextRTP& aCryptoHandlerRTPContext,
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    MSRTPCryptoHandlerContextRTCP& aCryptoHandlerRTCPContext)
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    : TSRTPStreamInStateBase(aStreamContext,
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                            aCryptoHandlerRTPContext, 
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                            aCryptoHandlerRTCPContext)
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    {
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    }
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// ----------------------------------------------------------------------------
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// TSRTPStreamInStateNormal::DoUnprotectSrtpL
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// ----------------------------------------------------------------------------
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//		
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HBufC8* TSRTPStreamInStateNormal::DoUnprotectSrtpL(const TDesC8& aPacket)
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    {
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	SRTP_DEBUG_DETAIL( "TSRTPStreamInStateNormal::DoUnprotectSrtpL ENTRY" );
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   	SRTP_DEBUG_TINT_VALUE( "Encrypted PacketLength is", aPacket.Length() );            
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    // first initialize current encrypted RTP packet..
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    iCryptoHandlerRTPContext.InitializeEncryptedPacketL(aPacket);    
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    // Step 2 (in RFC 3711, section 3.3):
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    // count the packet index i
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    iCryptoHandlerRTPContext.CountReceiverPacketIndexL();
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    // check MKI if it is used
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    iCryptoHandlerRTPContext.CheckMasterKeyIdentifierL();
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    // derive session keys..
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    if (iCryptoHandlerRTPContext.MasterKeysUpdated())
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        {
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        iCryptoHandlerRTPContext.DeriveSessionKeysL();        
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        }
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    // do the replay protection 
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    iCryptoHandlerRTPContext.ReplayProtectionL();
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    // do the authentication (integrity check)
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    iCryptoHandlerRTPContext.AuthenticateL();
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     // decrypt..
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    HBufC8* decryptedPacket = iCryptoHandlerRTPContext.DecryptL();
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    // Step 7, conditional update s_l and ROC values..
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    // (in RFC 3711, section 3.3):         
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    iCryptoHandlerRTPContext.Update_s_l_and_RocL();
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    iCryptoHandlerRTPContext.AddReplayIndex();
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    ///Should check the next Packet Index and decide if need to be re-key
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    SRTP_DEBUG_TINT_VALUE( "the decrypted packet Length is", decryptedPacket->Length());
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    SRTP_DEBUG_DETAIL( "TSRTPStreamInStateNormal::DoUnprotectSrtpL EXIT" );
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    return decryptedPacket;    
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    }
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// ----------------------------------------------------------------------------
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// TSRTPStreamInStateNormal::DoUnprotectSrtcpL
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// ----------------------------------------------------------------------------
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//		
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HBufC8* TSRTPStreamInStateNormal::DoUnprotectSrtcpL(const TDesC8& aPacket)
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    {
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    // first initialize current encrypted RTP packet..
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    iCryptoHandlerRTCPContext.InitializeEncryptedPacketL(aPacket);    
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  //(in RFC 3711, section 3.4):
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    // count the packet index i
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    iCryptoHandlerRTCPContext.ReceiverPacketIndexL();
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    // check MKI if it is used
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    iCryptoHandlerRTCPContext.CheckMasterKeyIdentifierL();
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    // derive session keys..
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    if (iCryptoHandlerRTCPContext.MasterKeysUpdated())
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        {
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        iCryptoHandlerRTCPContext.DeriveSessionKeysL();        
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        }
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    // do the replay protection 
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    iCryptoHandlerRTCPContext.ReplayProtectionL();
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    // do the authentication (integrity check)
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    iCryptoHandlerRTCPContext.AuthenticateL();
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     // decrypt..
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    HBufC8* decryptedPacket = iCryptoHandlerRTCPContext.DecryptL();
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    iCryptoHandlerRTCPContext.AddReplayIndex();  
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    ///Should check the next Packet Index and decide if need to be re-key
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    //Set updateKey needed and then lateron compared the key if the key is the same then ignore packet
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    //implemented later
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    // return decrypted RTCP packet
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    return decryptedPacket;    
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    }