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Re: [Dcrup] Adam Roach's No Objection on draft-ietf-dcrup-dkim-usage-04: (with COMMENT)

"Murray S. Kucherawy" <superuser@gmail.com> Tue, 24 October 2017 19:58 UTC

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From: "Murray S. Kucherawy" <superuser@gmail.com>
Date: Tue, 24 Oct 2017 12:58:10 -0700
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To: Scott Kitterman <sklist@kitterman.com>
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Subject: Re: [Dcrup] Adam Roach's No Objection on draft-ietf-dcrup-dkim-usage-04: (with COMMENT)
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On Thu, Oct 19, 2017 at 3:54 AM, Scott Kitterman <sklist@kitterman.com>
wrote:

> My assumption had been that since there's no valid signature with
> rsa-sha1, there's nothing to even consider putting in an A-R header field.
>
> I think the only result that can go in this case is None.  I hadn't
> thought we'd need to say that, but I guess maybe we do.
>

I think "policy" is the right way to go.  There's nothing technically wrong
with an rsa-sha1 signature, but you're deciding not to accept it.  It's the
same as you deciding you're not going to accept a perfectly valid
rsa-sha256 signature on a message simply because that signature didn't
include the Subject field.

-MSK

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