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

From: Kosztolányi Péter
Subject: Re: [Linphone-developers] patch to add zrtp-hash support to linphone
Date: Sun, 17 Feb 2013 15:29:20 +0100

These patches just work on android and iphone using freeswitch in proxy-media mode.

Thank you Eli

On Fri, Feb 15, 2013 at 10:52 PM, Eli Burke <address@hidden> wrote:
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.


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