1 /*

     2 * Copyright (c) 2005 Nokia Corporation and/or its subsidiary(-ies).

     3 * All rights reserved.

     4 * This component and the accompanying materials are made available

     5 * under the terms of "Eclipse Public License v1.0"

     6 * which accompanies this distribution, and is available

     7 * at the URL "http://www.eclipse.org/legal/epl-v10.html".

     8 *

     9 * Initial Contributors:

    10 * Nokia Corporation - initial contribution.

    11 *

    12 * Contributors:

    13 *

    14 * Description:    implementation

    15 *

    16 */

    17 

    18 

    19 

    20 #ifndef MSRTPCRYPTOHANDLERCONTEXTRTP_H

    21 #define MSRTPCRYPTOHANDLERCONTEXTRTP_H

    22 

    23 #include <e32std.h>

    24 #include "msrtpcryptohandlercontext.h"

    25 

    26 // CLASS DECLARATION

    27 /*

    28 * A context for stream classes for using RTP-specific crypto handling operations.

    29 *

    30 *  @lib n/a

    31 */

    32 class MSRTPCryptoHandlerContextRTP: public MSRTPCryptoHandlerContext

    33 	{	

    34     public: // New functions  

    35         /*

    36         * Determines the index i

    37         * of an SRTP packet with given sequence number SEQ on sender's side.         

    38         * @return void        

    39         */

    40 	    virtual void CountSenderPacketIndexL() = 0;	    

    41 

    42         /*

    43         * Implements pseudocode on RFC 3711 Appendix A

    44         * for determining the index i of an SRTP packet with given sequence number SEQ

    45         * and current s_l value in receiver side

    46         * @leave KErrNone if success, system-wide error code otherwise

    47         * @return void                

    48         */

    49         virtual void CountReceiverPacketIndexL() = 0;

    50         

    51         /*

    52         * Conditionally update ROC in sender's side:

    53         * Each time SEQ wraps MOD 2^16, the sender side must 

    54         * increment ROC by one MOD 2^32.

    55         * @return void                

    56         */

    57         virtual void UpdateROC() = 0;

    58                 

    59         /*

    60         * Conditionally update s_l and ROC based on v value. 

    61         * See RFC 3711 section 3.3.1 for more information

    62         * @leave KErrNone if success, system-wide error code otherwise

    63         * @return void                

    64         */

    65         virtual void Update_s_l_and_RocL() = 0;

    66 

    67         /*

    68         * Assign receiver counter s_l to the value of first sequence number. 

    69         * @return void                

    70         */

    71         virtual void SetReceiver_s_l() = 0;

    72         

    73 	};

    74 #endif  //MSRTPCryptoHandlerContextRTP_H