--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/rtp/srtpstack/src/srtppacketsrtp.cpp	Tue Feb 02 01:03:15 2010 +0200
@@ -0,0 +1,249 @@
+/*
+* Copyright (c) 2004 Nokia Corporation and/or its subsidiary(-ies).
+* All rights reserved.
+* This component and the accompanying materials are made available
+* under the terms of "Eclipse Public License v1.0"
+* which accompanies this distribution, and is available
+* at the URL "http://www.eclipse.org/legal/epl-v10.html".
+*
+* Initial Contributors:
+* Nokia Corporation - initial contribution.
+*
+* Contributors:
+*
+* Description:    SRTP-specific packet handling routines.
+*
+*/
+
+
+
+
+// INCLUDES
+#include "srtppacketsrtp.h"
+#include "srtpcryptohandler.h"
+#include "srtpcryptocontext.h"
+#include "srtpmasterkey.h"
+#include "srtpmastersalt.h"
+#include "srtputils.h"
+
+_LIT8( KMKINULL, "NULL");
+
+// -----------------------------------------------------------------------------
+// CSRTPPacketSRTP::CSRTPPacketSRTP
+// -----------------------------------------------------------------------------
+//
+CSRTPPacketSRTP::CSRTPPacketSRTP(const TDesC8& aPacket,
+                      CSRTPCryptoHandler& aHandler)
+    : CSRTPPacketRTP(aPacket, aHandler),
+        iAuthenticationTag(TPtrC8()),       
+        iMasterKeyIdentifier(TPtrC8())
+            {
+            
+            }
+
+// -----------------------------------------------------------------------------
+// CSRTPPacketSRTP::~CSRTPPacketSRTP
+// -----------------------------------------------------------------------------
+//
+CSRTPPacketSRTP::~CSRTPPacketSRTP()
+            {
+            
+            }
+
+// ---------------------------------------------------------------------------
+// Two-phased constructor. 
+// 
+// ---------------------------------------------------------------------------
+//
+CSRTPPacketSRTP* CSRTPPacketSRTP::NewL(const TDesC8& aPacket,
+                      CSRTPCryptoHandler& aHandler)
+    {
+    CSRTPPacketSRTP* self = new( ELeave )CSRTPPacketSRTP( aPacket, aHandler);
+    CleanupStack::PushL( self );    
+    self->ConstructL();
+    CleanupStack::Pop( self );        
+    return self;
+    }
+
+// -----------------------------------------------------------------------------
+// void CSRTPPacketSRTP::ConstructL
+// -----------------------------------------------------------------------------
+//
+void CSRTPPacketSRTP::ConstructL()
+    {            
+    CSRTPPacketRTP::ConstructL();
+    UpdatePayloadLengthL();
+    SRTP_DEBUG_TINT_VALUE( "SRTP payload length", iPayloadLength );
+    
+    UpdatePayload();               
+    UpdateAuthenticationTagL();    
+    UpdateMasterKeyIdentifier();        
+    }
+
+// ---------------------------------------------------------------------------
+// CSRTPPacketSRTP::AuthenticationTag()
+// ---------------------------------------------------------------------------
+//
+TPtrC8 CSRTPPacketSRTP::AuthenticationTag()
+    {
+    SRTP_DEBUG_DETAIL( "SRTP HMAC authen tag and the tag in the packet" );
+    SRTP_DEBUG_PACKET( iAuthenticationTag );    
+    		
+    return iAuthenticationTag;
+    }
+
+
+// ---------------------------------------------------------------------------
+// CSRTPPacketSRTP::MasterKeyIdentifier()
+// ---------------------------------------------------------------------------
+//
+TPtrC8 CSRTPPacketSRTP::MasterKeyIdentifier()
+    {
+    return iMasterKeyIdentifier;
+    }
+
+// ---------------------------------------------------------------------------
+// CSRTPPacketSRTP::UpdatePayloadLengthL()
+// ---------------------------------------------------------------------------
+//
+void CSRTPPacketSRTP::UpdatePayloadLengthL()
+    {    
+    SRTP_DEBUG_DETAIL( "CSRTPPacketSRTP::UpdatePayloadLengthL ENTRY" );
+
+     // the real RTP packet length is 
+     // the packet size - header - MKI - Auth tag
+     // Need implementation of caculating RCC
+     // when RCC is not included but the tag length is 14 or 8
+     TUint rocLength=KSRTPROCLength4;
+     TUint authTagLen=0;
+     authTagLen = iHandler.Context().CryptoParams().iSrtpAuthTagLen/8;	
+     if (!TagWithROCLengthL() && (
+     	iHandler.Context().CryptoParams().iSrtpAuthAlg  == EAuthRCCm2 ||
+     	iHandler.Context().CryptoParams().iSrtpAuthAlg  == EAuthRCCm3))
+     	{
+     	authTagLen -= rocLength;
+     	}
+     if (!TagWithROCLengthL() && (
+     	iHandler.Context().CryptoParams().iSrtpAuthAlg == EAuthRCCm1))
+     	{
+     	authTagLen=0;
+     	}	
+     TUint deductedLen = HeaderLength() + iHandler.Context().MasterKey().MKI().Length() + authTagLen;     
+     
+     iPayloadLength = iPacket.Length() - deductedLen;    
+     if ( iPacket.Length() <= HeaderLength() )
+     	{
+     	iPayloadLength = 0;
+     	}	
+    SRTP_DEBUG_TINT_VALUE( "SRTP payload length", iPayloadLength);
+    SRTP_DEBUG_DETAIL( "CSRTPPacketSRTP::UpdatePayloadLengthL EXIT" );
+    }
+    
+    
+// ---------------------------------------------------------------------------
+// CSRTPPacketSRTP::CountDecryptedPacketSize()
+// ---------------------------------------------------------------------------
+//
+TUint CSRTPPacketSRTP::CountDecryptedPacketSize()
+    {
+    return iHeaderLength + iPayloadLength;    
+    }    
+    
+// ---------------------------------------------------------------------------
+// CSRTPPacketSRTP::CreateDecryptedPacketL()
+// ---------------------------------------------------------------------------
+//
+HBufC8* CSRTPPacketSRTP::CreateDecryptedPacketL(TUint8* aDecryptedPayloadPtr)
+    {
+    // create decrypted RTP packet
+    // first count needed packet size
+    TUint rtpPacketSize = CountDecryptedPacketSize();
+    
+    return CopyHeaderAndPayloadL(rtpPacketSize, aDecryptedPayloadPtr);
+    
+    }
+
+// ---------------------------------------------------------------------------
+// CSRTPPacketSRTP::UpdateAuthenticationTag()
+// ---------------------------------------------------------------------------
+//
+void CSRTPPacketSRTP::UpdateAuthenticationTagL()
+    {       
+    //Here means MAC part
+    TPtrC8 authTag = GetAuthenticationTagL();  
+    if (authTag.Compare(KNullDesC8))
+       	{     
+    	iAuthenticationTag.Set(authTag.Ptr(), authTag.Length());
+       	}
+    }    
+
+// ---------------------------------------------------------------------------
+// CSRTPPacketSRTP::GetAuthenticationTag()
+// ---------------------------------------------------------------------------
+//
+TPtrC8 CSRTPPacketSRTP::GetAuthenticationTagL()
+    {       
+    if ((iHandler.Context().CryptoParams().iSrtpAuthTagLen > 0) && 
+        iHandler.Context().CryptoParams().iSrtpAuthAlg == EAuthHMAC_SHA1)
+        {
+         TUint authTagLength = iHandler.Context().CryptoParams().iSrtpAuthTagLen;
+         TUint authTagLenInBytes = authTagLength/8;
+         TUint packetLength = iPacket.Length();
+         TUint position = packetLength - authTagLenInBytes;
+         
+         return iPacket.Mid(position,authTagLenInBytes);
+        }
+     if ((iHandler.Context().CryptoParams().iSrtpAuthTagLen > 0) &&
+     	((iHandler.Context().CryptoParams().iSrtpAuthAlg == EAuthRCCm1 && 
+     		TagWithROCLengthL()) ||
+        iHandler.Context().CryptoParams().iSrtpAuthAlg == EAuthRCCm2))
+     	{
+     	TUint authTagLength = iHandler.Context().CryptoParams().iSrtpAuthTagLen;
+     	TUint authTagLenInBytes = authTagLength/8;//14
+     	//Here we only need MAC part
+     	authTagLenInBytes-= 4;
+     	TUint packetLength = iPacket.Length();
+        TUint position = packetLength - authTagLenInBytes;
+         
+        return iPacket.Mid(position,authTagLenInBytes);
+     	}  
+    // in case of EAuthRCCm3 and EAuthNULL  	 
+    TPtrC8 authTagNull(KNullDesC8);
+    return  authTagNull;    
+    } 
+
+// ---------------------------------------------------------------------------
+// CSRTPPacketSRTP::GetMasterKeyIdentifier()
+// ---------------------------------------------------------------------------
+//
+TPtrC8 CSRTPPacketSRTP::GetMasterKeyIdentifier()
+    {
+    if(iHandler.Context().MasterKey().MKI()!= KNullDesC8)
+    	{    
+	    TInt mkiLength = iHandler.Context().MasterKey().MKI().Length();
+	    if (iHandler.Context().MasterKey().MKI().Length() > 0)
+	        {
+	         TUint authTagLength = iHandler.Context().CryptoParams().iSrtpAuthTagLen;
+	         TUint authTagLenInBytes = authTagLength/8;
+	         TUint position = iPacket.Length() - authTagLenInBytes - mkiLength;
+	                                
+	         return iPacket.Mid(position,mkiLength);
+	        }
+    	}
+    TPtrC8 mkiNull( KMKINULL );
+    return  mkiNull; 
+    }    
+           
+// ---------------------------------------------------------------------------
+// CSRTPPacketSRTP::UpdateMasterKeyIdentifierL()
+// ---------------------------------------------------------------------------
+//
+void CSRTPPacketSRTP::UpdateMasterKeyIdentifier()
+    {    
+     TPtrC8 mki = GetMasterKeyIdentifier();
+     if (mki.Compare( KMKINULL ))
+     	{
+     	iMasterKeyIdentifier.Set(mki.Ptr(),mki.Length());	
+     	}
+    }    
+