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Re: [TLS] Simplifying signature algorithm negotiation

David Benjamin <davidben@chromium.org> Sat, 16 January 2016 01:19 UTC

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References: <CAF8qwaCpYqs7ELDcRzXveLLjpL+d-CmBczkxPweh6_RVE1aDeA@mail.gmail.com> <201601152007.12464.davemgarrett@gmail.com>
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From: David Benjamin <davidben@chromium.org>
Date: Sat, 16 Jan 2016 01:19:40 +0000
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To: Dave Garrett <davemgarrett@gmail.com>
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Cc: ekr <notifications@github.com>, tls@ietf.org
Subject: Re: [TLS] Simplifying signature algorithm negotiation
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On Fri, Jan 15, 2016 at 8:07 PM Dave Garrett <davemgarrett@gmail.com> wrote:

> On Friday, January 15, 2016 03:45:34 pm David Benjamin wrote:
> > This is a proposal for revising SignatureAlgorithm/HashAlgorithm. In TLS
> > 1.2, signature algorithms are spread across the handshake.
> [...]
> > I propose we fold the negotiable parameters under one name.
> [...]
> > 2. Remove HashAlgorithm, SignatureAlgorithm, SignatureAndHashAlgorithm as
> > they are. Introduce a new SignatureAlgorithm u16 type and negotiate that
> > instead.
>
> I previously proposed this here:
> https://www.ietf.org/mail-archive/web/tls/current/msg18035.html
>
> ekr was against it, though it hasn't been discussed that throughly.
> https://www.ietf.org/mail-archive/web/tls/current/msg18036.html


Ah, thanks! I must have missed this discussion. Or perhaps I saw it and
forgot.

ekr, are you still against this sort of thing? I think the new CFRG
signature algorithms tying decisions together is a good argument for why
we'd want this. If we believe this trend is to continue (and I hope it
does. Ed25519 is a nice and simple interface), trying to decompose it all
seems poor.

David

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