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Re: [TLS] Last Call: <draft-ietf-tls-tls13-24.txt> (The Transport Layer Security (TLS) Protocol Version 1.3) to Proposed Standard

Martin Thomson <martin.thomson@gmail.com> Fri, 02 March 2018 01:05 UTC

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From: Martin Thomson <martin.thomson@gmail.com>
Date: Fri, 02 Mar 2018 12:05:46 +1100
Message-ID: <CABkgnnX4quvfJOQ2eiuCfopsua=50vs6uhEp7Q9TN=_Y4kXYUA@mail.gmail.com>
To: Sean Turner <sean@sn3rd.com>
Cc: Benjamin Kaduk <bkaduk@akamai.com>, "<tls@ietf.org>" <tls@ietf.org>, draft-ietf-tls-tls13@ietf.org, tls-chairs <tls-chairs@ietf.org>
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Subject: Re: [TLS] Last Call: <draft-ietf-tls-tls13-24.txt> (The Transport Layer Security (TLS) Protocol Version 1.3) to Proposed Standard
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I think that I was suggesting this:

  The following values SHALL be marked as
  "Recommended": ecdsa_secp256r1_sha256, ecdsa_secp384r1_sha384,
  rsa_pss_rsae_sha256, rsa_pss_rsae_sha384,rsa_pss_rsae_sha512,
  rsa_pss_pss_sha256, rsa_pss_pss_sha384,rsa_pss_pss_sha512, and
  ed25519.

On Fri, Mar 2, 2018 at 11:45 AM, Sean Turner <sean@sn3rd.com> wrote:
>
>> On Mar 1, 2018, at 16:31, Martin Thomson <martin.thomson@gmail.com> wrote:
>>
>> On Fri, Mar 2, 2018 at 7:32 AM, Benjamin Kaduk <bkaduk@akamai.com> wrote:
>>> To expound a bit more on my thinking, pss_pss is what we actually want
>>> people to be using, thus it should be Recommended, but pss_rsae is what
>>> people are actually going to be using (to large extent), and that is
>>> still a deployment that we consider good and useful, for now.  Maybe in
>>> 5 years the IESG can change those "yes"es to "no"s, of course.
>>
>> I think that I agree.  For recommendations PSS is fine.  If the
>> question is MTI, then I think we're stuck with pss_rsae.
>
> I’ll submitted a revised PR [0] to change that will swap out the rsa_pss_sha* with rsa_pss_rsae_sha*:
>
> OLD:
>
>   The following values SHALL be marked as
>   "Recommended": ecdsa_secp256r1_sha256, ecdsa_secp384r1_sha384,
>   rsa_pss_sha256, rsa_pss_sha384, rsa_pss_sha512, ed25519.
>
> NEW:
>
>   The following values SHALL be marked as
>   "Recommended": ecdsa_secp256r1_sha256, ecdsa_secp384r1_sha384,
>   rsa_pss_rsae_sha256, rsa_pss_rsae_sha384,rsa_pss_rsae_sha512, and
>   ed25519.
>
> spt
>
> [0] https://github.com/tlswg/tls13-spec/pull/1159

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