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[Linphone-developers] patch to add zrtp-hash support to linphone

From: Eli Burke
Subject: [Linphone-developers] patch to add zrtp-hash support to linphone
Date: Fri, 15 Feb 2013 16:52:26 -0500

With some assistance from Werner Dittmann and Guillaume Beraudo, I've created 
patches to add zrtp-hash support to Linphone. At present this will add the hash 
of the ZrtpHello message to outgoing SDP messages but will not verify an 
incoming hash. Assuming the patches are accepted I'll add support for 
verification as well.

These patches (one to Linphone and one to its oRTP submodule) will allow 
Linphone to use ZRTP when connected to Freeswitch in proxy-media mode. 
Freeswitch contains special case logic that looks for the 'zrtp-hash' attribute 
in the SDP media definition of two clients and assigns the same SSRC to each 
channel. Without it, ZRTP fails because the SSRC gets changed and the internal 
packet hash will not match.

To the linphone developers: I've tried to match your style and coding standards 
to the best of my ability, but if there are any problems, please let me know. 
There are brief comments attached to most of the changes but I can expand upon 
them, or if you wish to make modifications I'd be happy to test them.


Attachment: linphone_zrtp_hash.patch
Description: Binary data

Attachment: ortp_add_zrtp_hash.patch
Description: Binary data

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