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Re: KEYS_READY

David Schinazi <dschinazi.ietf@gmail.com> Thu, 14 February 2019 22:02 UTC

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From: David Schinazi <dschinazi.ietf@gmail.com>
Date: Thu, 14 Feb 2019 14:01:54 -0800
Message-ID: <CAPDSy+4sKR99Fwqt+08JevAmC7E4LUSohUrQgVc+5BA56CLEkQ@mail.gmail.com>
Subject: Re: KEYS_READY
To: Martin Thomson <mt@lowentropy.net>
Cc: Mike Bishop <mbishop@evequefou.be>, Ryan Hamilton <rch=40google.com@dmarc.ietf.org>, Marten Seemann <martenseemann@gmail.com>, Jana Iyengar <jri.ietf@gmail.com>, Mikkel Fahnøe Jørgensen <mikkelfj@gmail.com>, QUIC WG <quic@ietf.org>
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On Thu, Feb 14, 2019 at 1:02 PM Martin Thomson <mt@lowentropy.net> wrote:

> Please explain how the two differ, because I'm not seeing a difference.
>

Here's the difference between them as I understand it:

I'd initially assumed KEYS_READY meant that the keys were installed -
meaning that you send KEYS_READY when your keys are installed. But not
quite! The server does not send KEYS_READY when the 1-RTT keys are
installed, it sends it when it believes the handshake is done. So now you
have a notion of keys being ready that is impacted by parts of the protocol
further away.

RETIRE_KEYS just means that you're done sending with a set of keys - so you
send it when you have received ACKs for everything you cared about sending
with those keys. I find that a lot more easier to reason about.

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