Re: [TLS] draft-ietf-tls-tls-13-17 posted

Eric Rescorla <ekr@rtfm.com> Fri, 21 October 2016 11:40 UTC

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From: Eric Rescorla <ekr@rtfm.com>
Date: Fri, 21 Oct 2016 04:39:59 -0700
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To: Ilari Liusvaara <ilariliusvaara@welho.com>
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Subject: Re: [TLS] draft-ietf-tls-tls-13-17 posted
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On Fri, Oct 21, 2016 at 2:33 AM, Ilari Liusvaara <ilariliusvaara@welho.com>;
wrote:

> On Thu, Oct 20, 2016 at 09:32:36AM -0700, Eric Rescorla wrote:
> > Folks,
> >
> > I have just uploaded draft-ietf-tls-tls13-17.
>
> Updated my own implementation from -16 to -17 (TODO: Add to
> implementations page, it isn't any of the ones listed).
>

Please do.

We're working on ours so interop testing would be great.


And since that implementation supports RFC7250 (for the server
> certificate), here is my interpretation of it:
>
> The certificate type is sent in extensions of EE certificate,
> via the usual server_certificate_type extension (using the server-side
> syntax from RFC7250).
>

I think this probably should go in Encrypted Extensions.


> ... Interop tests with picotls failed:
>
> - Picotls sends extension 13 (signature_algorithms) in ServerHello,
>   which my implementation does not like[1].
>

You are correct.



> - Picotls still seems to have the resumption_context mixed into
>   hashes. I tought that got nuked when switching to "finished
>   stuffing"? This causes wrong encryption keys to be derived,
>   causing the handshake to blow up.
>

It did.



> [1] Wasn't this ripped out in -17? The -17 draft seems to list that
> extension as "clear", shouldn't it be "client" as the AFAIK the
> server won't send it?
>

Thanks. That got missed in the update.

-Ekr


>
>
> -Ilari
>