rtp/srtpstack/src/srtpcryptohandlersrtp.cpp
author Petteri Saari <petteri.saari@digia.com>
Thu, 02 Dec 2010 15:23:48 +0200
branchMSRP_FrameWork
changeset 60 7634585a4347
parent 0 307788aac0a8
permissions -rw-r--r--
This release addresses the following: - Multiple concurrent file transfer bug fixes. i.e. one device is concurrently receiving multiple files from multiple devices
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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:    .
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*
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*/
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// INCLUDES
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#include <e32std.h>
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#include "srtpcryptohandler.h"
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#include "srtpcryptohandlersrtp.h"
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#include "msrtpcryptohandlercontext.h"
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#include "srtputils.h"
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#include <e32math.h>
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#include "srtpstream.h"
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#include "srtpmasterkey.h"
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#include "srtpmastersalt.h"
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#include "msrtpkeyderivation.h"
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#include "msrtpauthentication.h"
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#include "msrtpcipher.h"
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#include "srtppacketrtp.h"
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#include "srtppacketsrtp.h"
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#include "srtpcryptoparams.h"
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#include "srtpcipher_aescm128.h"
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#include "srtpcipher_null.h"
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#include "srtpauthentication_hmac_sha1.h"
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#include "srtpauthentication_null.h"
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#include "srtpauthentication_rcc.h"
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// ---------------------------------------------------------------------------
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// CSRTPCryptoHandlerSRTP::CSRTPCryptoHandlerSRTP
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// ---------------------------------------------------------------------------
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//
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CSRTPCryptoHandlerSRTP::CSRTPCryptoHandlerSRTP( CSRTPStream& aStream):
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            CSRTPCryptoHandler(aStream)
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            {}
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// ---------------------------------------------------------------------------
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// CSRTPCryptoHandlerSRTP::~CSRTPCryptoHandlerSRTP
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// ---------------------------------------------------------------------------
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//
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CSRTPCryptoHandlerSRTP::~CSRTPCryptoHandlerSRTP( )
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    {
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    }
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// ---------------------------------------------------------------------------
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// Two-phased constructor. 
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// 
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// ---------------------------------------------------------------------------
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//
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CSRTPCryptoHandlerSRTP* CSRTPCryptoHandlerSRTP::NewL(CSRTPStream& aStream)
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    {
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    CSRTPCryptoHandlerSRTP* self = CSRTPCryptoHandlerSRTP::NewLC( aStream);
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    CleanupStack::Pop( self );
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    return self;    
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    }
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// -----------------------------------------------------------------------------
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// CSRTPCryptoHandlerSRTP::NewLC
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// -----------------------------------------------------------------------------
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//
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CSRTPCryptoHandlerSRTP* CSRTPCryptoHandlerSRTP::NewLC(CSRTPStream& aStream)
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    {
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    CSRTPCryptoHandlerSRTP* self = new( ELeave )CSRTPCryptoHandlerSRTP( aStream);
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    CleanupStack::PushL( self );    
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    self->ConstructL();
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    return self;
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    }
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// -----------------------------------------------------------------------------
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// CSRTPCryptoHandlerSRTP::SetReceiver_s_l
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// -----------------------------------------------------------------------------
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//
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void CSRTPCryptoHandlerSRTP::SetReceiver_s_l()
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    {
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    // initialize s_l value for the first packet
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    iS_L=iCurrentPacket->SequenceNumber();
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    }
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// ---------------------------------------------------------------------------
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// CSRTPCryptoHandlerSRTP::ConstructL()
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// ---------------------------------------------------------------------------
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//
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void CSRTPCryptoHandlerSRTP::ConstructL() 
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    {    
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    //construct the upper class
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    CSRTPCryptoHandler::ConstructL();
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    SetEncAndAuthL( CryptoParams().iSrtpEncAlg,
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    				CryptoParams().iSrtpAuthAlg	);
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    //when the session starts set ROC to zero        
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    iROC =0; //only using when RCC mode as sender Roc
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    SetROC(0);      
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    iPktIndex=0;//Replay Index
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    iReplayIndexDelta=0;
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    iSRTPMasterKeyLifeTime = CryptoParams().iMasterKeysLifeTime;
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    if ( !iSRTPMasterKeyLifeTime || 
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    	iSRTPMasterKeyLifeTime > KSRTPMasterKeysLifeTime )
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    	{
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    	iSRTPMasterKeyLifeTime = KSRTPMasterKeysLifeTime;								
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    	}    
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    }
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// ---------------------------------------------------------------------------
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// void CSRTPCryptoHandlerSRTP::MasterKeysUpdated()
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// ---------------------------------------------------------------------------
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//
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TBool CSRTPCryptoHandlerSRTP::MasterKeysUpdated()
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    {
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    return iMasterDataUpdated;
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    }  
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// ---------------------------------------------------------------------------
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// void CSRTPCryptoHandlerSRTP::InitializePlainPacketL()
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// ---------------------------------------------------------------------------
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//
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void CSRTPCryptoHandlerSRTP::InitializePlainPacketL(const TDesC8& aPacket)
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    {
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    if(iCurrentPacket)
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    	delete iCurrentPacket; iCurrentPacket=NULL; 
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    iCurrentPacket = CSRTPPacketRTP::NewL(aPacket, *this);
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    }  
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// ---------------------------------------------------------------------------
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// void CSRTPCryptoHandlerSRTP::InitializeEncryptedPacketL()
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// ---------------------------------------------------------------------------
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//
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void CSRTPCryptoHandlerSRTP::InitializeEncryptedPacketL(const TDesC8& aPacket)
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    {
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    if(iCurrentPacket)
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    	delete iCurrentPacket;iCurrentPacket=NULL; 
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    iCurrentPacket = CSRTPPacketSRTP::NewL(aPacket, *this);
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    }  
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// ---------------------------------------------------------------------------
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// CSRTPCryptoHandlerSRTP::DecryptL()
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// ---------------------------------------------------------------------------
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//
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HBufC8* CSRTPCryptoHandlerSRTP::DecryptL()
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    {    
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    // Step 6, decryption (in RFC 3711, section 3.3):    
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  	SRTP_DEBUG_DETAIL( "CSRTPCryptoHandlerSRTP::DecryptL() Entry" );
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	HBufC8* decryptedPayload = CountIV_And_TransformL();      
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    CleanupStack::PushL(decryptedPayload);                                               
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    TUint8* decryptedPayloadPtr = const_cast<TUint8*>(decryptedPayload->Des().Ptr());        
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    HBufC8* rtpPacket = iCurrentPacket->CreateDecryptedPacketL(decryptedPayloadPtr);
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    TUint8* rtpPacketPtr = const_cast<TUint8*>(rtpPacket->Des().Ptr());        
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    SRTP_DEBUG_DETAIL( "SRTP Decrypt Payload" );
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    SRTP_DEBUG_PACKET( *decryptedPayload );    
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    CleanupStack::PopAndDestroy( decryptedPayload );  
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    SRTP_DEBUG_DETAIL( "CSRTPCryptoHandlerSRTP::DecryptL() Exit" );
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    return rtpPacket;                              
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    }
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// ---------------------------------------------------------------------------
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// CSRTPCryptoHandlerSRTP::AuthenticateL()
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// ---------------------------------------------------------------------------
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//
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void CSRTPCryptoHandlerSRTP::AuthenticateL()
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    {         
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    SRTP_DEBUG_DETAIL( "CSRTPCryptoHandlerSRTP::AuthenticateL() ENTRY" );
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    //Note that RCCm1 only to integrity check when carrying ROC
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    if ( iCurrentPacket->AuthenticationTag().Length() > 0 && 
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    	( CryptoParams().iSrtpAuthAlg == EAuthHMAC_SHA1 ||
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    	CryptoParams().iSrtpAuthAlg == EAuthRCCm2||
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    	( CryptoParams().iSrtpAuthAlg == EAuthRCCm1&& CarryROC() ) ))
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        {        
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        // calculate auth tag from the authenticated area..
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        HBufC8* calculatedAuthTag = CalculateAuthTagL(); 
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        	if (!calculatedAuthTag)
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        	{
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        	User::Leave(KErrNotFound);	
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        	}
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        CleanupStack::PushL(calculatedAuthTag);
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        // finally, compare the two auth tags..
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        if (iCurrentPacket->AuthenticationTag().Compare(
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                                    *calculatedAuthTag) != 0)
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            {
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            SRTP_DEBUG_DETAIL( "SRTP HMAC caculated Authentication tag and the compared is wrong" );
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            SRTP_DEBUG_PACKET( *calculatedAuthTag );    
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            // authentication failed, since tags dont match
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            User::Leave(KErrNotFound);
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            }
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        // then, lose the auth tag we just calculated 
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        CleanupStack::PopAndDestroy(calculatedAuthTag);       
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        }
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    //authentication successful then set localROC to sender ROC need to be implemented     
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    SRTP_DEBUG_DETAIL( "CSRTPCryptoHandlerSRTP::AuthenticateL() EXIT" );
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    }
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   222
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// ---------------------------------------------------------------------------
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// CSRTPCryptoHandlerSRTP::CalculateAuthTagL()
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// only using in SRTP 
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// ---------------------------------------------------------------------------
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//
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HBufC8* CSRTPCryptoHandlerSRTP::CalculateAuthTagL()
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    {                                     
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    // M denotes the authenticated area, that is header + payload..
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    // ..but for RTP we need to add the ROC,
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    // that is, M = header + payload || ROC        
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    TBuf8<16> roc;
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    TBuf8<8> roc_hexed;    
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    //using iV instead of ROC because ROC is not updated yet until decryption sucessfull 
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    roc.AppendNumUC(iV, EHex); 
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    TSRTPUtils::DeHex(roc, roc_hexed); 
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    TUint size = roc.Size();
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	for (TInt i=0; i<(4-size); i++)
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        {
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        roc_hexed.Append(0x00);        
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        }
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 	TInt len = iCurrentPacket->HeaderLength() + iCurrentPacket->PayloadLength();
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   	HBufC8* authPortion = iCurrentPacket->Get_Concatenated_MDataL(EFalse);
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   	CleanupStack::PushL(authPortion);
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    authPortion->Des().SetLength(len);    
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    HBufC8* calculatedAuthTag = DoAuthenticationL(*authPortion, roc_hexed);
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    CleanupStack::PopAndDestroy(authPortion);          
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    roc.Zero();
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    roc_hexed.Zero();  
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    return calculatedAuthTag;
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    }
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// ---------------------------------------------------------------------------
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// CSRTPCryptoHandlerSRTP::CountReceiverPacketIndexL()
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// ---------------------------------------------------------------------------
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//
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void CSRTPCryptoHandlerSRTP::CountReceiverPacketIndexL()
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    {   
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    if (iReKey)
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    	{
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    	User::Leave(KErrTooBig);
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    	}
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    TReal result;                          
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    TReal twoexp32=  4294967296;
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    //TReal twoexp16= 65536;
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    TReal ROCnumber= ROC()-1;
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    if (iS_L < 32768)
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        {
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        if (iCurrentPacket->SequenceNumber() - iS_L > 32768)
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            {
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            User::LeaveIfError(Math::Mod(result, ROCnumber /*ROC() - 1*/, twoexp32));
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            User::LeaveIfError(Math::Int(iV, result));
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            }
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        else
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            {
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            iV = ROC();
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            }
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        }
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    else
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        {
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        if (iS_L - 32768 > iCurrentPacket->SequenceNumber())
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            {
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            User::LeaveIfError(Math::Mod(result, ROC() + 1, twoexp32));
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            User::LeaveIfError(Math::Int(iV, result));                                    
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            }
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        else
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            {
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            iV = ROC();
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            }        
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        }
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    ReKeyCheck();
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    //Set for current Packet index  
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    //check if authAlg is RCCmode and if carry ROC 
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    if (CarryROC())
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    	{
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    	iCurrentPacket->SetPacketIndex(CountSndIndxbySndROC());
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    	iROC = iCurrentPacket->GetSenderROC();
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    	}
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    else
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    	{
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    	iCurrentPacket->SetPacketIndex(iCurrentPacket->SequenceNumber() + iV * 65536/*K2EXP16*/);	
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    	}	
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    }
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// ---------------------------------------------------------------------------
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// void CSRTPCryptoHandlerSRTP::CheckMasterKeyIdentifierL()
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// ---------------------------------------------------------------------------
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//
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void CSRTPCryptoHandlerSRTP::CheckMasterKeyIdentifierL()
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    {
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    // Step 3 (in RFC 3711, section 3.3):
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    // verify that this packet uses the same MKI
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    // than we have in CryptoContext    
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    if(Context().MasterKey().MKI()!= KNullDesC8)
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    	{
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	    if (Context().MasterKey().MKI().Length() > 0)
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	        {
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	        TPtrC8 mki = iCurrentPacket->MasterKeyIdentifier();
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	        if (Context().MasterKey().MKI().Compare(mki) != 0)
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	            {
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	            // we can not process this packet, since MKI does not match
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	             User::Leave(KErrNotFound);
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   337
	            }
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   338
	        }       
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   339
    	}
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   340
    }  
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   341
   
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   342
// ---------------------------------------------------------------------------
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   343
// CSRTPCryptoHandlerSRTP::Update_s_l_and_RocL()
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   344
// ---------------------------------------------------------------------------
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   345
//
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   346
void CSRTPCryptoHandlerSRTP::Update_s_l_and_RocL()
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   347
    {   
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   348
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   349
    TReal result;      
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   350
    TInt32 intResult;    
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   351
    TReal modulus(0x100000000);
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   352
     
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   353
    // count (ROC - 1) mod 2^32   
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   354
       
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   355
    TInt res = Math::Mod(result, ROC() - 1, modulus);
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   356
    if (res!=KErrNone)
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   357
        {
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   358
        User::Leave(res);
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   359
        }
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   360
    
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   361
    intResult = (TUint)result;
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   362
        
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   363
    // if v == (ROC - 1) mod 2^32
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   364
    if (iV == intResult)
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   365
        {
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   366
        // no update
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   367
        return;
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   368
        }
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   369
            
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   370
    // if v == ROC        
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   371
    if (iV == ROC())
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   372
        {
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   373
        // if SEQ > s_l
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   374
        if (iCurrentPacket->SequenceNumber() > iS_L)
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   375
            {
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   376
            //set s_l = SEQ
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   377
            iS_L = iCurrentPacket->SequenceNumber();
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   378
            }        
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   379
        }
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   380
    else
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   381
        {
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   382
        // count (ROC + 1) mod 2^32             
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   383
        TReal temp=  4294967296;        
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   384
        res = Math::Mod(result, ROC() + 1, temp/*K2EXP32*/);
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   385
        if (res!=KErrNone)
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   386
            {
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   387
            User::Leave(res);
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   388
            }
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   389
        res = Math::Int(intResult, result);
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   390
        if (res!=KErrNone)
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   391
            {
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   392
            User::Leave(res);
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   393
            }
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   394
        
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   395
        // if v == (ROC + 1) mod 2^32
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   396
        if (iV == intResult)
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   397
            {
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   398
            // set s_l to SEQ, and
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   399
            // ROC to v
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   400
            iS_L = iCurrentPacket->SequenceNumber();
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   401
            SetROC(iV);
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   402
            }
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   403
        } 
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   404
    //RCCm1 and RCCm2 authentication successful then set localROC to sender ROC                     
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   405
    //no authentication needed for RCCm3
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   406
     if ((iCurrentPacket->AuthenticationTag().Length()>0 && CarryROC())||
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   407
     		(CryptoParams().iSrtpAuthAlg == EAuthRCCm3 &&
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   408
     		CarryROC() && !CryptoParams().iIsRCCm3Sync))
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   409
     	{
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   410
     	SetROC(iROC);
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   411
     	}
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   412
    
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   413
    }
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   414
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   415
        
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   416
// ---------------------------------------------------------------------------
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   417
// CSRTPCryptoHandlerSRTP::CountSenderPacketIndex()
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   418
// ---------------------------------------------------------------------------
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   419
//
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   420
void CSRTPCryptoHandlerSRTP::CountSenderPacketIndexL()
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   421
    {   
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   422
    if (iReKey)
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   423
    	{
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   424
    	User::Leave(KErrTooBig);
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   425
    	}
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   426
    //iReKey should be false
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   427
    iCurrentPacket->CountSenderPacketIndex();
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   428
    /*For Re-Key,
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   429
    RFC 3711 3.2.1 and 9.2
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   430
    i= 2^16*roc + seq
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   431
    */
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   432
    
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   433
    ReKeyCheck();
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   434
    }
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   435
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   436
// ---------------------------------------------------------------------------
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   437
// CSRTPCryptoHandlerSRTP::ReKeyCheck()
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   438
// ---------------------------------------------------------------------------
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   439
//
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   440
void CSRTPCryptoHandlerSRTP::ReKeyCheck()
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   441
	{
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   442
	TReal remainder;
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   443
    Math::Mod(remainder, iCurrentPacket->SequenceNumber(), 0x10000-1);
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   444
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   445
    // update ROC when SEQ wraps 2^16,
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   446
    // with following exception:
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   447
    // when SEQ is 0, MOD result is also 0,
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   448
    // but we want remainder to be 0
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   449
    // only when SEQ == 65535     
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   450
    if (remainder == 0.0 && iCurrentPacket->SequenceNumber() != 0)
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   451
    	{
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   452
    	if (ROC()+1 >= (0x100000000-1))
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   453
	        {
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   454
	        //RFC3711 3.2.1, i=2^16(1+ROC) , i can not more than 2^48
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   455
	        //Hex 0x100000000 is 2^32
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   456
	        // CRITICAL error
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   457
	        // we have sent more than 2^48 packets,
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   458
	        // can not send any more, should do reKey  
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   459
	        //Should consider sending and receiving case  
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   460
	        //Re-Key is needed, can send bye packet or event should be logged
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   461
	    	//Sendbye should be at application level 
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   462
	    	iReKey = ETrue;
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   463
	    	iStream.KeyExpired();        
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   464
	        iStream.ReKeyNeeded();
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   465
	    	} 
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   466
    	}
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   467
    TUint64 reKeyNumPacket = iNumPackets + KLeftNumOfPacketBeforeReKey; 
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   468
    //Re-Key is only called once when the number is equal
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   469
    if ( ( reKeyNumPacket ) == iSRTPMasterKeyLifeTime )
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   470
    	{
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   471
    	//Call for Rekey before expired
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   472
    	iStream.ReKeyNeeded();
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   473
    	}
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   474
    //when packets is really gets there, key expired
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   475
    if ( iNumPackets >=  iSRTPMasterKeyLifeTime )
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   476
    	{
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   477
		iReKey = ETrue;
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   478
    	iStream.KeyExpired();        
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   479
    	}
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   480
	}
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   481
// ---------------------------------------------------------------------------
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   482
// CSRTPCryptoHandlerSRTP::CountIV_And_TransformL()
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   483
// ---------------------------------------------------------------------------
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   484
//
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   485
HBufC8* CSRTPCryptoHandlerSRTP::CountIV_And_TransformL()
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   486
    {        
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   487
    /*    
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   488
    This step is the same in RTP encryption and decryption,
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   489
    RTCP case is different. 
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   490
    */    
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   491
    //IV is 128 bit value
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   492
    TBuf8<16> iv;           
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   493
    // set IV to be 128 bit, 16 octets
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   494
    iv.SetLength(16);       
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   495
    
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   496
    // count the IV for decryption   
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   497
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   498
    TInt ret = TSRTPUtils::CountIV(iv, *iSessionSaltKey, SSRC(), iCurrentPacket->PacketIndex());
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   499
    
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   500
    if (ret!=KErrNone)
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   501
        {
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   502
        User::Leave(ret);
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   503
        }
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   504
    
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   505
    // Step 5, encryption (in RFC 3711, section 3.3):    
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   506
    return iCipher->TransformL( *iSessionEncrKey, 
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   507
                                iv, iCurrentPacket->Payload() );  
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   508
    }
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   509
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   510
// ---------------------------------------------------------------------------
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   511
// CSRTPCryptoHandlerSRTP::EncryptL()
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   512
// ---------------------------------------------------------------------------
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   513
//
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   514
HBufC8* CSRTPCryptoHandlerSRTP::EncryptL()
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   515
    {        
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   516
    // Step 5, encryption (in RFC 3711, section 3.3):    
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   517
    SRTP_DEBUG_DETAIL( "CSRTPCryptoHandlerSRTP::EncryptL() ENTRY" );
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   518
    
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   519
    SRTP_DEBUG_DETAIL( "CountIV_And_TransformL" ); 
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   520
    HBufC8* encryptedPayload = CountIV_And_TransformL();      
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   521
    CleanupStack::PushL(encryptedPayload);         
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   522
   
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   523
    TUint8* encryptedPayloadPtr = const_cast<TUint8*>(encryptedPayload->Des().Ptr());        
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   524
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   525
    HBufC8* srtpPacket = iCurrentPacket->CreateEncryptedPacketL(encryptedPayloadPtr);
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   526
    CleanupStack::PushL(srtpPacket);     
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   527
    
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   528
    TUint8* srtpPacketPtr = const_cast<TUint8*>(srtpPacket->Des().Ptr());                
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   529
  	  
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   530
    //Step 6, Add MKI (in RFC 3711, section 3.3):    
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   531
    AddMKIToPacket(srtpPacketPtr);
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   532
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   533
	SRTP_DEBUG_DETAIL( "AddAuthTag" );
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   534
       
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   535
    //Step 7, Add authentication tag (in RFC 3711, section 3.3):
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   536
    if(IfAddAuthTag())
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   537
    	{
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   538
    	AddAuthTagToPacketL(srtpPacketPtr);        	
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   539
    	}
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   540
    
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   541
    CleanupStack::Pop(srtpPacket); 
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   542
    
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   543
    SRTP_DEBUG_DETAIL( "Encrypted Payload" );
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   544
    SRTP_DEBUG_PACKET(  *encryptedPayload );    
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   545
                                               
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   546
    CleanupStack::PopAndDestroy(encryptedPayload);   
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   547
    
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   548
    SRTP_DEBUG_DETAIL( "CSRTPCryptoHandlerSRTP::EncryptL() EXIT" );
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   549
                 
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   550
    return srtpPacket;        
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   551
    }
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   552
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   553
// ---------------------------------------------------------------------------
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   554
// CSRTPCryptoHandler::AddMKIToPacket
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   555
// 
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   556
// ---------------------------------------------------------------------------
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   557
//
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   558
void CSRTPCryptoHandlerSRTP::AddMKIToPacket(TUint8* aSrtpPacketPtr)
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   559
    {
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   560
    TUint8* ptr = aSrtpPacketPtr;        
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   561
    if(Context().MasterKey().MKI()!= KNullDesC8)
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   562
    	{
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   563
	    //Step 6, Add MKI (in RFC 3711, section 3.3):    
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   564
	    if (Context().MasterKey().MKI().Length()>0)
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   565
	        {
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   566
	        ptr += iCurrentPacket->HeaderLength();
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   567
	        ptr += iCurrentPacket->PayloadLength();
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   568
	        TUint8* mkiPtr = const_cast<TUint8*>(Context().MasterKey().MKI().Ptr());        
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   569
	        Mem::Copy( ptr, mkiPtr, Context().MasterKey().MKI().Length());                
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   570
	        }
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   571
    	}
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   572
    }
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   573
    
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   574
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   575
// ---------------------------------------------------------------------------
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   576
// CSRTPCryptoHandlerSRTP::AddAuthTagToPacketL
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   577
// 
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   578
// ---------------------------------------------------------------------------
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   579
//
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   580
void CSRTPCryptoHandlerSRTP::AddAuthTagToPacketL(TUint8* aSrtpPacketPtr)
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   581
    {
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   582
    TUint8* ptr = aSrtpPacketPtr;        
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   583
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   584
    //Step 7, Add authentication tag (in RFC 3711, section 3.3):
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   585
    if (CryptoParams().iSrtpAuthTagLen>0)
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   586
        {
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   587
        ptr += iCurrentPacket->HeaderLength();
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   588
        ptr += iCurrentPacket->PayloadLength();
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   589
        if(Context().MasterKey().MKI()!= KNullDesC8)
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   590
	    	{
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   591
	        ptr += Context().MasterKey().MKI().Length(); 
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   592
	    	}
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   593
        TBuf8<16> roc;
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   594
    	TBuf8<8> roc_hexed;
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   595
    	  
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   596
    	if (!CarryROC())
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   597
    		{
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   598
    		roc.AppendNumUC(ROC(), EHex); 	
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   599
    		}
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   600
    	else
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   601
    		{
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   602
    		roc.AppendNumUC(iROC, EHex);
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   603
    		}	
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   604
    	
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   605
    
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   606
    	TSRTPUtils::DeHex(roc, roc_hexed); 
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   607
    	TUint size = roc.Size();
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   608
    	                
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   609
		for (TInt i=0; i<(4-size); i++)
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   610
        	{
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   611
        	roc_hexed.Append(0x00);        
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   612
        	}
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   613
        //Copy the authenticatin portion only not with MKI key part
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   614
  		TInt len= iCurrentPacket->HeaderLength() + 	iCurrentPacket->PayloadLength();
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   615
   		HBufC8* authPortion = HBufC8::NewMaxLC(len);
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   616
        TUint8* authptr = const_cast<TUint8*>(authPortion->Des().Ptr());
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   617
        Mem::Copy( authptr, aSrtpPacketPtr, len);
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   618
    	authPortion->Des().SetLength(len);    
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   619
                 
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   620
    	HBufC8* authTag = DoAuthenticationL(*authPortion, roc_hexed);
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   621
      	CleanupStack::PopAndDestroy( authPortion );         
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   622
        authPortion=NULL;
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   623
       
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   624
        if (CarryROC())
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   625
        	{
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   626
        	TSRTPUtils::Write32( ptr,ROC());	
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   627
        	ptr+= KSRTPROCLength4;
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   628
        	}
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   629
        if (authTag)
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   630
        	{
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   631
        	Mem::Copy( ptr, authTag->Ptr(), authTag->Length());
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   632
        	}
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   633
        delete authTag;
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   634
        authTag=NULL;
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   635
        }    
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   636
    }
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   637
    
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   638
// ---------------------------------------------------------------------------
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   639
// CSRTPCryptoHandlerSRTP::DoAuthenticationL
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   640
// 
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   641
// ---------------------------------------------------------------------------
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   642
//
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   643
HBufC8* CSRTPCryptoHandlerSRTP::DoAuthenticationL(const TDesC8& aAuthenticatedArea,
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   644
											const TDesC8& aRoc)
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   645
    {                                     
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   646
    // calculate auth tag from the authenticated area..
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   647
    TUint authtaglen= CryptoParams().iSrtpAuthTagLen;
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   648
    // Note that RCCm3 work as Auth Null so taglen does not matter to RTP/RTCP
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   649
    if (aRoc.Length() && 
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   650
    	(CryptoParams().iSrtpAuthAlg ==EAuthRCCm1 ||
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   651
		CryptoParams().iSrtpAuthAlg == EAuthRCCm2 ))
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   652
    	{
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   653
    	authtaglen-= KSRTPAuthTagLength32 ;
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   654
    	}
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   655
    if 	((!aRoc.Length()) && 
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   656
    		( CryptoParams().iSrtpAuthAlg != EAuthNull &&
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   657
    		CryptoParams().iSrtpAuthAlg != EAuthHMAC_SHA1))
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   658
    	{
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   659
    	//This is for RTCP if using RCC mode because currently handler sharing 
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   660
    	//the same context
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   661
		authtaglen=KSRTPAuthTagDefaultLength;
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   662
    	}
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   663
    return iAuthenticator->AuthenticateL(authtaglen,
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   664
                                    *iSessionAuthKey, 
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   665
                                    aAuthenticatedArea,
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   666
                                    aRoc);                  
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   667
    }
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   668
        
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   669
// ---------------------------------------------------------------------------
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   670
// CSRTPCryptoHandlerSRTP::UpdateROC()
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   671
// ---------------------------------------------------------------------------
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   672
//
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   673
void CSRTPCryptoHandlerSRTP::UpdateROC()
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   674
    {
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   675
    // conditional update of ROC at sender's side
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   676
    
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   677
    TReal remainder;
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   678
    Math::Mod(remainder, iCurrentPacket->SequenceNumber(), 0x10000-1);
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   679
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   680
    // update ROC when SEQ wraps 2^16,
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   681
    // with following exception:
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   682
    // when SEQ is 0, MOD result is also 0,
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   683
    // but we want remainder to be 0
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   684
    // only when SEQ == 65535     
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   685
    if (remainder == 0.0 && iCurrentPacket->SequenceNumber() != 0)
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   686
        {
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   687
         SetROC(ROC()+1);        
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   688
        }
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   689
    //Add number of packets sending    
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   690
    iNumPackets++;    
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   691
    }
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   692
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   693
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   694
// ---------------------------------------------------------------------------
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   695
// CSRTPCryptoHandlerSRTP::DeriveSessionKeysL()
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   696
// ---------------------------------------------------------------------------
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   697
//   
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   698
void CSRTPCryptoHandlerSRTP::DeriveSessionKeysL()
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   699
    {
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   700
    SRTP_DEBUG_DETAIL( "CSRTPCryptoHandlerSRTP::DeriveSessionKeysL()  Entry " );
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   701
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   702
    TBuf8<100> sessionKey_X;
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   703
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   704
    DeleteSessionKeys();        
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   705
    
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   706
    TUint64 r = TSRTPUtils::Cnt_r(iCurrentPacket->PacketIndex(), 
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   707
                         CryptoParams().iSrtpKeyDervRate);
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   708
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   709
    sessionKey_X.SetLength(100);
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   710
    
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   711
    // session encryption key derivation :
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   712
    sessionKey_X.FillZ();    
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   713
    // first count X value for the session encryption key
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   714
    // note that the output length is determined by master salt
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   715
    Count_X(r, KSRTPEncryptionLabel, KSRTPIndexLength, sessionKey_X);    
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   716
    // then add possible padding bits,
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   717
    // and call the current PRF_n function (AESCM)
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   718
    iSessionEncrKey = iKeyDeriver->PRF_128BitL(Context().MasterKey().EncrKeyLength(),
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   719
                                            Context().MasterKey().MasterKey(), 
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   720
                                            sessionKey_X);
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   721
    
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   722
    SRTP_DEBUG_DETAIL( "iSessionEncrKey as CipherKey" );
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   723
             
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   724
    SRTP_DEBUG_PACKET( *iSessionEncrKey );     
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   725
                                       
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   726
    // note that the result is already truncated to the user defined size by PRF function
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   727
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   728
    // session authentication key derivation :
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   729
    sessionKey_X.FillZ();
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   730
    // first count X value for the session authentication key
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   731
    // note that the output length is determined by master salt    
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   732
    Count_X(r, KSRTPAuthenticationLabel, KSRTPIndexLength, sessionKey_X);        
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   733
    // then add possible padding bits,
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   734
    // and call the current PRF_n function (AESCM)
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   735
    iSessionAuthKey = iKeyDeriver->PRF_128BitL(Context().MasterKey().AuthKeyLength(),
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   736
                                            Context().MasterKey().MasterKey(), 
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   737
                                            sessionKey_X);
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   738
    //iSessionAuthKey->Des().SetLength(Context()->MasterKey().AuthKeyLength());                                        
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   739
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   740
	SRTP_DEBUG_DETAIL( "iSessionAuthKey" );
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   741
	SRTP_DEBUG_PACKET( *iSessionAuthKey );    
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   742
    // note that the result is already truncated to the user defined size by PRF function
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   743
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   744
    // session salting key derivation :
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   745
    sessionKey_X.FillZ();
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   746
    // first count X value for the session salting key
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   747
    // note that the output length is determined by master salt    
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   748
    Count_X(r, KSRTPSaltingLabel, KSRTPIndexLength, sessionKey_X);        
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   749
    // then add possible padding bits,
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   750
    // and call the current PRF_n function (AESCM)
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   751
    iSessionSaltKey = iKeyDeriver->PRF_128BitL(Context().MasterSalt().SaltLength(),
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   752
                                            Context().MasterKey().MasterKey(), 
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   753
                                            sessionKey_X);
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   754
    SRTP_DEBUG_DETAIL( "iSessionSaltKey" );
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   755
    SRTP_DEBUG_PACKET( *iSessionSaltKey );    
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   756
                                              
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   757
    // note that the result is already truncated to the user defined size by PRF function
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   758
    
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   759
     iMasterDataUpdated = EFalse;    
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   760
 	}
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   761
    
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   762
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   763
// ---------------------------------------------------------------------------
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   764
// void CSRTPCryptoHandlerSRTP::ReplayProtectionL()
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   765
// ---------------------------------------------------------------------------
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   766
//
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   767
void CSRTPCryptoHandlerSRTP::ReplayProtectionL()
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   768
    {
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   769
    //Index estamation
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   770
    if ( CryptoParams().iSrtpReplayProtection )
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   771
    	{
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   772
    	TInt delta =0;
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   773
	  	delta= (iCurrentPacket->PacketIndex()) - iPktIndex; //set as 0
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   774
		      
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   775
		//Index check
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   776
		User::LeaveIfError (ReplayCheck(delta));
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   777
		//if the index is inside the replay window and index does not appear in rdb
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   778
		//then Index add after authentication passed  
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   779
	    iReplayIndexDelta= delta;
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   780
    	}
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   781
    }
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   782
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   783
// ---------------------------------------------------------------------------
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   784
// TInt CSRTPCryptoHandlerSRTP::AddReplayIndex() 
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   785
// ---------------------------------------------------------------------------
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   786
//
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   787
void
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   788
CSRTPCryptoHandlerSRTP::AddReplayIndex() 
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   789
	{
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   790
	if ( CryptoParams().iSrtpReplayProtection )
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   791
		{
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   792
		
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   793
		if (iReplayIndexDelta > 0) 
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   794
			{
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   795
		    /* shift forward by delta */
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   796
		    //iPktIndex += iReplayIndexDelta;
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   797
		    iPktIndex = iCurrentPacket->PacketIndex();
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   798
		  	} 
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   799
		else 
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   800
		  	{
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   801
		    /* delta is in window, so flip bit in bitmap */
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   802
		    /* mark as seen */
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   803
		    TInt diff= -(iReplayIndexDelta);
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   804
		    iBitmap |= ((TUint64)1 << diff); 
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   805
		  	}
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   806
		}
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   807
	  /* note that we need not consider the case that delta == 0 */
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   808
	iNumPackets++;
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   809
	}
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   810
	
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   811
// ---------------------------------------------------------------------------
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   812
// TBool CSRTPCryptoHandlerSRTP::CarryROC
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   813
// ---------------------------------------------------------------------------
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   814
//
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   815
TBool CSRTPCryptoHandlerSRTP::CarryROC()
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   816
	{
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   817
	if ( CryptoParams().iSrtpAuthAlg == EAuthRCCm1 ||
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   818
		 CryptoParams().iSrtpAuthAlg == EAuthRCCm2 ||
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   819
		 CryptoParams().iSrtpAuthAlg == EAuthRCCm3 )
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   820
		{
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   821
		TReal remainder;
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   822
		// SEQ%R
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   823
		Math::Mod( remainder, iCurrentPacket->SequenceNumber(), 
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   824
									CryptoParams().iROCTransRate);
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   825
		//SEQ%R=0
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   826
		if ( !remainder )
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   827
			return ETrue;
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   828
		//SEQ%R!=0
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   829
		return EFalse;
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   830
		}
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   831
	return EFalse;
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   832
	}
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   833
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   834
// ---------------------------------------------------------------------------
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   835
// TInt64 CSRTPCryptoHandlerSRTP::CountSndIndxbySndROC
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   836
// ---------------------------------------------------------------------------
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   837
//	
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   838
TInt64 CSRTPCryptoHandlerSRTP::CountSndIndxbySndROC()
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   839
	{
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   840
	//This is called when receiving
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   841
	//i = 2^16 * ROC + SEQ.
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   842
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   843
	TInt64 indx = 65535 * ( iCurrentPacket->GetSenderROC() ) + 
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   844
					iCurrentPacket->SequenceNumber();
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   845
	
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   846
	return indx;
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   847
	}
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   848
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   849
// ---------------------------------------------------------------------------
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   850
// TBool CSRTPCryptoHandlerSRTP::IfAddAuthTag()
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   851
// ---------------------------------------------------------------------------
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   852
//	
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   853
TBool CSRTPCryptoHandlerSRTP::IfAddAuthTag()
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   854
	{
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   855
	if (( CryptoParams().iSrtpAuthAlg== EAuthRCCm1 &&
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   856
		!CarryROC() ) || CryptoParams().iSrtpAuthAlg == EAuthNull
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   857
		)
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   858
		{
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   859
		return EFalse;
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   860
		}
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   861
	return ETrue;
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   862
	}
307788aac0a8 Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   863