Re: [quicwg/base-drafts] use a HANDSHAKE_DONE frame to drive the handshake to confirmation (#3145)

Ryan Hamilton <notifications@github.com> Fri, 25 October 2019 04:29 UTC

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Date: Thu, 24 Oct 2019 21:29:42 -0700
From: Ryan Hamilton <notifications@github.com>
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Subject: Re: [quicwg/base-drafts] use a HANDSHAKE_DONE frame to drive the handshake to confirmation (#3145)
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RyanAtGoogle commented on this pull request.



> @@ -385,13 +385,9 @@ perspective of the endpoint in question.
 
 ### Handshake Confirmed {#handshake-confirmed}
 
-In this document, the TLS handshake is considered confirmed at an endpoint when
-the following two conditions are met: the handshake is complete, and the
-endpoint has received an acknowledgment for a packet sent with 1-RTT keys.
-This second condition can be implemented by recording the lowest packet number
-sent with 1-RTT keys, and the highest value of the Largest Acknowledged field
-in any received 1-RTT ACK frame: once the latter is higher than or equal to the
-former, the handshake is confirmed.
+In this document, the TLS handshake is considered confirmed at the server when
+the handshake completes. At the client, the handshake is considered confirmed
+when the HANDSHAKE_DONE frame is received.

Overall, I quite like this HANDSHAKE_DONE proposal. It seems obviously correct which, given our previous iterations is rather appealing :)

I agree with Ian that allowing the client to drop handshake keys when it receives an ACK of a 1-RTT packet sounds like a great optimization which helps ensure the keys get dropped quickly.



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