--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/rtp/srtpstack/inc/msrtpcryptohandlercontext.h	Tue Feb 02 01:03:15 2010 +0200
@@ -0,0 +1,110 @@
+/*
+* 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 MSRTPCRYPTOHANDLERCONTEXT_H
+#define MSRTPCRYPTOHANDLERCONTEXT_H
+
+#include <e32std.h>
+
+
+// CLASS DECLARATION
+/*
+* A context for stream classes for using common crypto handling operations.
+* These are common for both RTP and RTCP
+*
+*  @lib n/a
+*/
+class MSRTPCryptoHandlerContext
+	{	
+    public: 
+        /*
+        * virtual function for initializing 
+        * plain packet class (CSRTPPacketRTP or CSRTPPacketRTCP) 
+        * @param aPacket   RTP/RTCP packet.
+        * @leave KErrNone if success, system-wide error code otherwise
+        * @return void
+        */        
+        virtual void InitializePlainPacketL(const TDesC8& aPacket) = 0;
+
+        /*
+        * virtual function for initializing 
+        * encrypted packet class (CSRTPPacketSRTP or CSRTPPacketSRTCP) 
+        * @param aPacket   SRTP/SRTCP packet.
+        * @leave KErrNone if success, system-wide error code otherwise
+        * @return void
+        */        
+        virtual void InitializeEncryptedPacketL(const TDesC8& aPacket) = 0;
+                                
+        /*
+        * virtual function for deriving session keys
+        * @leave KErrNone if success, system-wide error code otherwise
+        * @return void
+        */        
+        virtual void DeriveSessionKeysL() = 0;        
+        
+        /*
+        * virtual function for checking that crypto context MKI and 
+        * packet MKI match.
+        * @leave KErrNone if success, system-wide error code otherwise
+        * @return void
+        */        
+        virtual void CheckMasterKeyIdentifierL() = 0;
+        
+        /*
+        * virtual function for performing the authentication step
+        * @leave KErrNone if success, system-wide error code otherwise
+        * @return void
+        */        
+        virtual void AuthenticateL() = 0;
+        
+        /*
+        * virtual function for performing the replay protection step
+        * @leave KErrNone if success, system-wide error code otherwise
+        * @return void
+        */        
+        virtual void ReplayProtectionL() = 0;        
+
+        /*
+        * virtual function for encrypting plain packet
+        * @leave KErrNone if success, system-wide error code otherwise
+        * @return encrypted packet
+        */        
+        virtual HBufC8* EncryptL() = 0;
+
+        /*
+        * virtual function for decrypting ciphered packet
+        * @leave KErrNone if success, system-wide error code otherwise
+        * @return plain packet
+        */        
+        virtual HBufC8* DecryptL() = 0;
+
+        /*
+        * virtual function for querying whether master key or salt has been updated
+        * @return master keys update status
+        */        
+        virtual TBool MasterKeysUpdated() = 0;
+
+        /*
+        * virtual function for incrementing Replay Protection Index after 
+        * the packet has been authenticated
+        * @return void
+        */                
+        virtual void AddReplayIndex() =0;
+	};
+#endif  //MSRTPCryptoHandlerContext_H