Re: [TLS] Call for WG adoption draft-josefsson-tls-curve25519

Ilari Liusvaara <ilari.liusvaara@elisanet.fi> Wed, 20 May 2015 17:15 UTC

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Date: Wed, 20 May 2015 20:15:04 +0300
From: Ilari Liusvaara <ilari.liusvaara@elisanet.fi>
To: Joseph Salowey <joe@salowey.net>
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Subject: Re: [TLS] Call for WG adoption draft-josefsson-tls-curve25519
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On Wed, May 20, 2015 at 08:47:55AM -0700, Joseph Salowey wrote:
> This is the WG call for adoption of:
> 
> https://www.ietf.org/archive/id/draft-josefsson-tls-curve25519-06.txt
> 
> This draft specifies the use of Curve25519 for ephemeral key exchange in
> the TLS and DTLS.  This draft serves as the starting point (it’s expired
> and needs to be updated in light of
> http://datatracker.ietf.org/doc/draft-irtf-cfrg-curves/).  If you object to
> the adoption of this draft, please let us know why by 20150602.

Adopt.
 
> Note: We’re not doing an early code point assignment for this draft,
> because it clearly needs to resurrected and tweaked.  Once that happens,
> there’s nothing stopping a request from the authors for an early code point
> assignment.

Agreed:

- Add curve448?
- Do bit masking like cfrg-curves specifies?
- Add zero key check like crfg-curves specifies[1]?
- Why the point format and prefix? Expecting other point formats without
  new codepoint allocation[2]? Or some software engineering reason?


[1] While it is not helpful with properly designed protocols, it is
helpful with less-well-designed ones. It is very cheap anyway.

[2] AFAIK, not allowed in 1.3 anyway.


-Ilari