--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/rtp/srtpstack/inc/msrtpcryptohandlercontextrtp.h	Tue Feb 02 01:03:15 2010 +0200
@@ -0,0 +1,74 @@
+/*
+* Copyright (c) 2005 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:    implementation
+*
+*/
+
+
+
+#ifndef MSRTPCRYPTOHANDLERCONTEXTRTP_H
+#define MSRTPCRYPTOHANDLERCONTEXTRTP_H
+
+#include <e32std.h>
+#include "msrtpcryptohandlercontext.h"
+
+// CLASS DECLARATION
+/*
+* A context for stream classes for using RTP-specific crypto handling operations.
+*
+*  @lib n/a
+*/
+class MSRTPCryptoHandlerContextRTP: public MSRTPCryptoHandlerContext
+	{	
+    public: // New functions  
+        /*
+        * Determines the index i
+        * of an SRTP packet with given sequence number SEQ on sender's side.         
+        * @return void        
+        */
+	    virtual void CountSenderPacketIndexL() = 0;	    
+
+        /*
+        * Implements pseudocode on RFC 3711 Appendix A
+        * for determining the index i of an SRTP packet with given sequence number SEQ
+        * and current s_l value in receiver side
+        * @leave KErrNone if success, system-wide error code otherwise
+        * @return void                
+        */
+        virtual void CountReceiverPacketIndexL() = 0;
+        
+        /*
+        * Conditionally update ROC in sender's side:
+        * Each time SEQ wraps MOD 2^16, the sender side must 
+        * increment ROC by one MOD 2^32.
+        * @return void                
+        */
+        virtual void UpdateROC() = 0;
+                
+        /*
+        * Conditionally update s_l and ROC based on v value. 
+        * See RFC 3711 section 3.3.1 for more information
+        * @leave KErrNone if success, system-wide error code otherwise
+        * @return void                
+        */
+        virtual void Update_s_l_and_RocL() = 0;
+
+        /*
+        * Assign receiver counter s_l to the value of first sequence number. 
+        * @return void                
+        */
+        virtual void SetReceiver_s_l() = 0;
+        
+	};
+#endif  //MSRTPCryptoHandlerContextRTP_H