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Re: [COSE] Key identifier of type bstr / int

Anders Rundgren <anders.rundgren.net@gmail.com> Tue, 22 March 2022 03:59 UTC

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Date: Tue, 22 Mar 2022 04:59:43 +0100
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To: Carsten Bormann <cabo@tzi.org>, Michael Richardson <mcr+ietf@sandelman.ca>
Cc: Goran Selander <goran.selander@ericsson.com>, Orie Steele <orie@transmute.industries>, Laurence Lundblade <lgl@island-resort.com>, "cose@ietf.org" <cose@ietf.org>
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From: Anders Rundgren <anders.rundgren.net@gmail.com>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/cose/s9l__KMzwo6tGaN97Ma0KYv7W7s>
Subject: Re: [COSE] Key identifier of type bstr / int
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It is hard for me to understand that the saving of a single byte it worth this much attention.

Anyway, if there will a change, it requires SW updates, but only for those who actually adopt the enhanced definition.  My guess is that connected systems nowadays support automatic firmware updates making the latter a non-issue.

In the COSE Signature Format (CSF) scheme I ran into the same issue and changed back-and-forth until I finally came up with the obvious: let key Id be a CBOR Object.

In a specific application using CSF, the profile was set to use "bstr".

I'm sure some people prefer "tstr" since it is JOSE compatible.  By revising/extending the COSE kid to Object, everybody get what they want.


Otherwise, I would suggest status quo.

Anders
https://test.webpki.org/csf-lab/home

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