Re: [quicwg/base-drafts] Permit 0-RTT after Retry and VN (#1514)

Martin Thomson <notifications@github.com> Tue, 03 July 2018 23:08 UTC

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Subject: Re: [quicwg/base-drafts] Permit 0-RTT after Retry and VN (#1514)
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martinthomson commented on this pull request.



> @@ -770,6 +776,28 @@ are in a different packet number space to other packets (see
 {{packet-numbers}}).
 
 
+### 0-RTT Packet Numbers {#retry-0rtt-pn}
+
+Packet numbers for 0-RTT protected packets use the same space as 1-RTT protected
+packets.
+
+After a client receives a Retry or Version Negotiation packet, it MAY attempt to
+send data in 0-RTT packets after it sends a new Initial packet.  However, a
+client MUST NOT reset the packet number it uses for 0-RTT packets.  The keys
+used to protect 0-RTT keys are not guaranteed to change as a result of

I struggled with finding the right words, but I have a plan now.  They won't change unless the cryptographic handshake does.  (And I will leave unsaid the reasons why it might not - we have reason to believe that Retry will never cause a change and VN might, but that detail is elsewhere and if we follow the justification rabbit-hole to the end we'll be singing about oysters in no time.)

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