SRTP audio encryption problems

[Toby Jaffey]

Hello,

I am attempting to use gstreamer for audio encryption using SRTP but am unable to get a working pipeline.
Can anyone suggest what is wrong here:

        GST_DEBUG=2 gst-launch-1.0 -v audiotestsrc wave=2 freq=200 ! alawenc ! rtppcmapay ! 'application/x-rtp, payload=(int)8, ssrc=(uint)123' ! srtpenc key="012345678901234567890123456789012345678901234567890123456789" ! udpsink host=127.0.0.1 port=5555

        GST_DEBUG=2 gst-launch-1.0 udpsrc port=5555 caps='application/x-srtp, payload=(int)8, ssrc=(uint)123, srtp-key=(buffer)012345678901234567890123456789012345678901234567890123456789, srtp-cipher=(string)aes-128-icm, srtp-auth=(string)hmac-sha1-80, srtcp-cipher=(string)aes-128-icm, srtcp-auth=(string)hmac-sha1-80' !  srtpdec ! rtppcmadepay ! alawdec ! pulsesink

The receiver is dropping data with the following warning:

        :770:request_key_with_signal:<srtpdec0> Could not get caps for stream with SSRC 123
        0:00:12.994153383  7472      0x202e770 WARN                 srtpdec gstsrtpdec.c:1212:gst_srtp_dec_chain:<srtpdec0> Invalid buffer, dropping

Thanks.

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[Sebastian Dröge-3]

On Mon, 2018-03-26 at 10:35 +0100, Toby Jaffey wrote:

> Hello,
>
> I am attempting to use gstreamer for audio encryption using SRTP but
> am unable to get a working pipeline.
> Can anyone suggest what is wrong here:
>
> GST_DEBUG=2 gst-launch-1.0 -v audiotestsrc wave=2 freq=200 ! alawenc
> ! rtppcmapay ! 'application/x-rtp, payload=(int)8, ssrc=(uint)123' !
> srtpenc
> key="012345678901234567890123456789012345678901234567890123456789" !
> udpsink host=127.0.0.1 port=5555
>
> GST_DEBUG=2 gst-launch-1.0 udpsrc port=5555 caps='application/x-srtp,
> payload=(int)8, ssrc=(uint)123, srtp-
> key=(buffer)012345678901234567890123456789012345678901234567890123456
> 789, srtp-cipher=(string)aes-128-icm, srtp-auth=(string)hmac-sha1-80,
> srtcp-cipher=(string)aes-128-icm, srtcp-auth=(string)hmac-sha1-80'
> !  srtpdec ! rtppcmadepay ! alawdec ! pulsesink
>
> The receiver is dropping data with the following warning:
>
> :770:request_key_with_signal:<srtpdec0> Could not get caps for stream
> with SSRC 123
> 0:00:12.994153383  7472      0x202e770 WARN                 srtpdec
> gstsrtpdec.c:1212:gst_srtp_dec_chain:<srtpdec0> Invalid buffer,
> dropping

You have to connect to the "request-key" signal and return appropriate
caps there, or make sure to set complete caps on the stream via udpsrc. Your caps are missing the "roc" field at least.

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Sebastian Dröge, Centricular Ltd · https://www.centricular.com
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