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[quicwg/base-drafts] Rework Key Update (#2237)

Martin Thomson <notifications@github.com> Fri, 21 December 2018 01:26 UTC

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From: Martin Thomson <notifications@github.com>
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Subject: [quicwg/base-drafts] Rework Key Update (#2237)
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This section was pretty old and it had at least one bug, along with a
bunch of editorial lack of clarity.

Substantively, this does two things:

1. It specifies what label to use for the KDF when updating.  The
agreement at one time was that we would use a quic-specific label, but
that never really got captured properly.  This proposes "quic ku".

2. It specifies that acknowledgments of packets with a given key phase
are necessary before another update can be triggered.  As noted in
 #2214, simultaneous updates can result in a deadlock if updates happen
too quickly.  This has the nice effect of allowing update compliance to
be more rigorously tested.

Closes #2214.
You can view, comment on, or merge this pull request online at:

  https://github.com/quicwg/base-drafts/pull/2237

-- Commit Summary --

  * Rework Key Update

-- File Changes --

    M draft-ietf-quic-tls.md (92)

-- Patch Links --

https://github.com/quicwg/base-drafts/pull/2237.patch
https://github.com/quicwg/base-drafts/pull/2237.diff

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