Some fixes for minisip with respect to SRTP, RTP extensione headers and so on

[Werner Dittmann]

Cesc,

the changes I made in AES-CTR are necessary to be compliant to SRTP at all.
I haven't touched MIKEY stuff. I even reuse MIKEY stuff to setup and parameterize
the Crypto Context. However, I will cross check with respect to MIKEY.

As for the message router: I need the direction Media-to-GUI because the complete
ZRTP setup is handled in the media part. During this setup the ZRTP needs to inform
the user about the SAS (Short Authentication String) and the status of the session.

Regards,
Werner

Cesc wrote:
> Hi,
> 
> very good news.
> Can you check that the SRTP changes do not break other parts dependant
> on that code? i am thinking on the MIKEY part ...
> 
> As for the GUI-to-Media ... check two pieces: the audio silence, mic
> silence and the just added callRecord ... they are buttons on the GUI
> which send commands to the Media via the messagerouter ...
> 
> Cesc
> 
> On 7/2/06, Werner Dittmann <Werner.Dittmann at t-online.de> wrote:
>> All,
>>
>> as of today I had a first success with the ZRTP protocol. I got my
>> implementation to inter-operate with Phil Zimmermann's ZRTP software.
>> I had complete encrypted sessions, all keys were negotiated "on-the-fly",
>> no public key set up, no certificates required, etc. I'll check in the
>> stuff after some more tests and stabilization.
>>
>> During these tests I found some issues with RTP extension header support
>> in the RTP/SRTP part of minisip and fixed it. Also the crypto operations
>> needed a fix to deal with the extension header. In addition the AES CTR
>> crypto mod used a 32bit counter where the SRTP RFC required a 16bit
>> counter. Fixed that as well. After these fixes minisip was able to work
>> with the SRTP protocol as provided by the libsrtp project (ZFONE ZRTP
>> uses
>> this SRTP implementation, see http://srtp.sourceforge.net/srtp.html for
>> more info about this lib. BTW, the code of this lib is IMHO not very
>> readable).
>>
>> Thus, if there are any problems with AES, crypto, SRTP in minisip please
>> e-mail. Thanks.
>>
>> To have full support of ZRTP I need a way that the media handler
>> (media stream)
>> can communicate with the GUI. Can this be done via the message
>> handler? If yes
>> any hint and/or support is appreciated.
>>
>> Regards,
>> Werner
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