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Re: [TLS] draft-ietf-tls-tls13-21 posted

Eric Rescorla <ekr@rtfm.com> Wed, 05 July 2017 21:17 UTC

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From: Eric Rescorla <ekr@rtfm.com>
Date: Wed, 05 Jul 2017 14:16:47 -0700
Message-ID: <CABcZeBMgYNAfjD6_mDCQ4OmvifEXXP6R_FzA6o5BCRPm78kj0Q@mail.gmail.com>
To: Martin Thomson <martin.thomson@gmail.com>
Cc: Matt Caswell <frodo@baggins.org>, "tls@ietf.org" <tls@ietf.org>
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Subject: Re: [TLS] draft-ietf-tls-tls13-21 posted
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On Wed, Jul 5, 2017 at 2:14 PM, Martin Thomson <martin.thomson@gmail.com>
wrote:

> On 5 July 2017 at 20:35, Eric Rescorla <ekr@rtfm.com> wrote:
> > Yes, that might not be a terrible idea. I'd also be open to replacing
> > the hashes of 0 with an n-byte length 0 string. It's a tiny paper
> > cut (and a wire format change), but would make things slightly simpler .
>
> I think that would be best.  With the change to the transcript hash,
> the context would then be:
> 1. a transcript hash (size = hash function output)
> 2. 0 (size = 0)
> 3. ticket nonce (size = 1..255)
>

Yeah, I can do a PR for this.


Out of interest, why not permit 0 length ticket nonces for those of us
> that don't issue multiple tickets?
>

That seems fine too.


I think that we should take the hit and make the change.
>

-Ekr

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