--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/rtp/srtpstack/inc/msrtpcipher.h	Tue Feb 02 01:03:15 2010 +0200
@@ -0,0 +1,47 @@
+/*
+* 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:    Provides an abstract class for SRTP
+*                  cipher operation (encryption/decryption)
+*
+*/
+
+
+
+
+#ifndef __MSRTP_CIPHER_H__
+#define __MSRTP_CIPHER_H__
+
+#include <e32base.h>
+
+class MSRTPCipher
+    {
+    public:
+        /**
+        * This function is called by SRTP for 
+        * encryption/decryption cipher operation 
+        * regardless of the algorithm, the default is AESCM-128
+        * Produces key stream and performs an XOR operation for the plain text
+        * @param aKey  Input key.
+        * @param aIV  Integer Value (IV).
+        * @param aSrc source data which will be transformed.
+	    * Returns HBufC8* decrypted/encrypted source        
+        */
+        virtual HBufC8* TransformL(const TDesC8& aKey, 
+                                const TDesC8& aIV, 
+                                const TDesC8& aSrc ) = 0;
+                                
+        virtual ~MSRTPCipher() { };
+    };
+
+#endif // __MSRTP_CIPHER_H__