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<a href="https://gitlab.com/dueno">Daiki Ueno</a>
commented:
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<p>(1) <a href="https://github.com/openssl/openssl/pull/8797/" rel="nofollow noreferrer noopener" target="_blank">https://github.com/openssl/openssl/pull/8797/</a> (2) <a href="https://github.com/tatsuhiro-t/openssl/tree/quic-draft-22" rel="nofollow noreferrer noopener" target="_blank">https://github.com/tatsuhiro-t/openssl/tree/quic-draft-22</a></p>
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<p dir="auto">Thank you. Looks like (1) is more up to date than (2) and in fact <a href="https://github.com/ngtcp2/ngtcp2/blob/draft-22/examples/client.cc#L2114" rel="nofollow noreferrer noopener" target="_blank">the draft-22 branch of ngtcp2</a> is assuming <a href="https://github.com/openssl/openssl/pull/8797/files?short_path=cfb0d9d#diff-cfb0d9dad7f909619348dc0758d9f300" rel="nofollow noreferrer noopener" target="_blank">the API from (1)</a>.</p>
<p dir="auto">So we basically would need the following things:</p>
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<li>a callback to notify the key (epoch) change</li>
<li>a callback to write a Handshake messsage, when it is being sent</li>
<li>a callback to write an Alert messasge, when it is being sent</li>
<li>a callback to flush the message - not sure if this is really needed in GnuTLS</li>
<li>a function to push data received from the peer to the TLS layer</li>
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<p dir="auto">I guess (1) would be quite straightforward. Would you like to start with it? Basically you would need to hook the callback where new traffic keys are set, e.g.,:
<a href="https://gitlab.com/gnutls/gnutls/blob/master/lib/constate.c#L379">https://gitlab.com/gnutls/gnutls/blob/master/lib/constate.c#L379</a></p>
<p dir="auto">See also the NSS design document linked from my first comment.</p>
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