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

[martinduke <[e-mail]>]

martinduke commented on this pull request.



> @@ -760,14 +756,9 @@ and ignoring any outstanding Initial packets.
 
 ### Discarding Handshake Keys
 
-An endpoint MUST NOT discard its handshake keys until the TLS handshake is
-confirmed ({{handshake-confirmed}}).  An endpoint SHOULD discard its handshake
-keys as soon as it has confirmed the handshake.  Most application protocols
-will send data after the handshake, resulting in acknowledgements that allow
-both endpoints to discard their handshake keys promptly.  Endpoints that do
-not have reason to send immediately after completing the handshake MAY send
-ack-eliciting frames, such as PING, which will cause the handshake to be
-confirmed when they are acknowledged.
+An endpoint MUST discard its handshake keys when the TLS handshake is confirmed
+({{handshake-confirmed}}).  The server MUST send a HANDSHAKE_DONE frame within
+one round-trip time of handshake completion.

I agree with @ianswett. The handshake isn't complete when we have 0.5RTT data. In fact, if the frame goes out then, we can easily have the client discard the handshake keys before getting ACK of its finished.

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