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 #include "tsrtpstreamoutstateuninit.h"

    21 #include "msrtpstreamoutcontext.h"

    22 #include "msrtpcryptohandlercontext.h"

    23 #include "msrtpcryptohandlercontextrtp.h"

    24 #include "msrtpcryptohandlercontextrtcp.h"

    25 #include "srtputils.h"

    26 

    27 // ----------------------------------------------------------------------------

    28 // TSRTPStreamOutStateUninit::TSRTPStreamOutStateUninit

    29 // ----------------------------------------------------------------------------

    30 //

    31 TSRTPStreamOutStateUninit::TSRTPStreamOutStateUninit(

    32     MSRTPStreamOutContext& aStreamContext,

    33     MSRTPCryptoHandlerContextRTP& aCryptoHandlerRTPContext,

    34     MSRTPCryptoHandlerContextRTCP& aCryptoHandlerRTCPContext)

    35     : TSRTPStreamOutStateBase(aStreamContext,

    36                             aCryptoHandlerRTPContext, 

    37                             aCryptoHandlerRTCPContext)

    38     {

    39     }

    40 

    41 // ----------------------------------------------------------------------------

    42 // TSRTPStreamOutStateUninit::DoProtectRtpL

    43 // ----------------------------------------------------------------------------

    44 //		

    45 HBufC8* TSRTPStreamOutStateUninit::DoProtectRtpL(const TDesC8& aPacket)

    46     {

    47     SRTP_DEBUG_DETAIL( "TSRTPStreamOutStateUninit::DoProtectRtpL entry" );

    48     SRTP_DEBUG_TINT_VALUE( "PacketLength is", aPacket.Length());

    49                   

    50     // first initialize current RTP packet..

    51     iCryptoHandlerRTPContext.InitializePlainPacketL(aPacket);    

    52        

    53     // Step 2 (in RFC 3711, section 3.3):

    54     // count the packet index i

    55      iCryptoHandlerRTPContext.CountSenderPacketIndexL();

    56     

    57      SRTP_DEBUG_DETAIL( "StreamOutStateUninit, Protect, DeriveSessionKeysL" );

    58     

    59      // derive session keys..

    60      iCryptoHandlerRTPContext.DeriveSessionKeysL();

    61      SRTP_DEBUG_DETAIL( "StreamOutStateUninit, Protect, Encrypt" );

    62      // encrypt..

    63      HBufC8* protectedPacket = iCryptoHandlerRTPContext.EncryptL();

    64      

    65      // finally, conditional update of roll-over counter..

    66      iCryptoHandlerRTPContext.UpdateROC();

    67      

    68          

    69     // first RTP packet successfully encrypted..

    70     // session keys derived etc..

    71     // we can go to normal state

    72     SRTP_DEBUG_DETAIL( "ESRTPStreamOutNormal" );

    73     

    74     iStreamContext.ChangeRTPState(MSRTPStreamOutContext::ESRTPStreamOutNormal);

    75     

    76     

    77     SRTP_DEBUG_TINT_VALUE("length of protectPacket", protectedPacket->Length() );

    78     SRTP_DEBUG_DETAIL( "TSRTPStreamOutStateUninit::DoProtectRtpL exit" );

    79     

    80     // return encrypted RTP packet

    81     return protectedPacket;    

    82     }

    83 

    84 // ----------------------------------------------------------------------------

    85 // TSRTPStreamOutStateUninit::DoProtectRtcpL

    86 // ----------------------------------------------------------------------------

    87 //		

    88 HBufC8* TSRTPStreamOutStateUninit::DoProtectRtcpL(const TDesC8& aPacket)

    89     {

    90      // first initialize current RTP packet..

    91     iCryptoHandlerRTCPContext.InitializePlainPacketL(aPacket);    

    92        

    93     // Step 2 (in RFC 3711, section 3.4):

    94     //Srtcp packet index must be set to zero before the first srtcp packet is sent

    95     iCryptoHandlerRTCPContext.InitialPacketIndex();

    96 	

    97      // derive session keys..

    98      iCryptoHandlerRTCPContext.DeriveSessionKeysL();

    99                

   100      // encrypt..

   101      HBufC8* protectedPacket = iCryptoHandlerRTCPContext.EncryptL();

   102      

   103         

   104     // first RTP packet successfully encrypted..

   105     // session keys derived etc..

   106     // we can go to normal state

   107     iStreamContext.ChangeRTCPState(MSRTPStreamOutContext::ESRTPStreamOutNormal);

   108     

   109     SRTP_DEBUG_TINT_VALUE("length of protect RTCP Packet", protectedPacket->Length() );

   110      

   111     // return encrypted RTP packet

   112     return protectedPacket;    

   113     }

   114