Re: [quicwg/base-drafts] Output of the discard keys design team (#2673)

[David Schinazi <[e-mail]>]

DavidSchinazi commented on this pull request.



> @@ -1116,9 +1147,20 @@ TLS KeyUpdate message.  Endpoints MUST treat the receipt of a TLS KeyUpdate
 message as a connection error of type 0x10a, equivalent to a fatal TLS alert of
 unexpected_message (see {{tls-errors}}).
 
-An endpoint MUST NOT initiate more than one key update at a time.  A new key
-cannot be used until the endpoint has received and successfully decrypted a
-packet with a matching KEY_PHASE.
+An endpoint MUST NOT initiate the first key update until the handshake is
+confirmed ({{handshake-confirmed}}). An endpoint MUST NOT initiate a subsequent
+key update until it has received an ACK for a packet sent at the previous
+KEY_PHASE.  This can be implemented by tracking the lowest packet number sent
+with the previous KEY_PHASE, and the highest value of the Largest Acknowledged
+field in any received 1-RTT ACK frame: once the latter is higher than the
+former, another key update can be initiated.
+
+Endpoints only need to maintain the two latest sets of packet protection keys

I'm not sure this is correct. An endpoint can maintain more than 2 sets of keys if it so chooses.

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