[TLS] Earlier exporters

Eric Rescorla <ekr@rtfm.com> Fri, 07 October 2016 15:11 UTC

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From: Eric Rescorla <ekr@rtfm.com>
Date: Fri, 7 Oct 2016 08:10:49 -0700
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Subject: [TLS] Earlier exporters
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Please see the following PR:
  https://github.com/tlswg/tls13-spec/pull/673

This includes various changes to make exporters/resumption work better.

Basically:
1. Add a 0-RTT exporter and change the transcript for the regular exporter
so it
    only includes the transcript up to ServerFinished. This gives it parity
with the
    rest of the traffic keys. If we need an exporter with the full
transcript we can
    always add it later

2. Point out that you can predict ClientFinished for NST when not doing
    Client auth. This lets you issue tickets on the server's first flight,
while still
    ensuring that if you do client auth you still bind resumption to the
client's
    full transcript.

These are pretty straightforward changes, so absent objections I'll merge
them early next week.

-Ekr