Re: [Suit] [Teep] Value of COSE_Mac_Tagged/COSE_Sign_Tagged/COSE_Mac0_Tagged/COSE_Sign1_Tagged

Akira Tsukamoto <akira.tsukamoto@gmail.com> Thu, 09 April 2020 13:38 UTC

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From: Akira Tsukamoto <akira.tsukamoto@gmail.com>
Date: Thu, 9 Apr 2020 22:38:07 +0900
Message-ID: <CACuRN0OsFuq5hVVSAtLgpjYee8WqMFzFb6ObYBKTjxUXUBrUAw@mail.gmail.com>
To: Carsten Bormann <cabo@tzi.org>
Cc: Brendan Moran <Brendan.Moran@arm.com>, Akira Tsukamoto <akira.tsukamoto@aist.go.jp>, Jim Schaad <ietf@augustcellars.com>, Hannes Tschofenig <Hannes.Tschofenig@arm.com>, "suit@ietf.org" <suit@ietf.org>, teep <teep@ietf.org>
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Subject: Re: [Suit] [Teep] Value of COSE_Mac_Tagged/COSE_Sign_Tagged/COSE_Mac0_Tagged/COSE_Sign1_Tagged
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Hi Carsten and Hannes,

https://github.com/ietf-teep/teep-protocol/pull/27

The new pull request reflects all the discussion points of converting
from map and using minimum major type size for the array member.

When I was reading the cddl draft, I was not quite sure how to
describe the array with the label name.
In your pull request,

query-request = [
     type: TEEP-TYPE-query-request,
     token: uint,

The above cddl description has label name type and token with semicolon.
We were trying to avoid having label name inside the array.
I thought I have to use => for this purpose.

Other discussion we had with the teep is to use the same nonce as the
EAT defines.

nonce => bytes,
to be
nonce => bstr .size (8..64)

And the size of token we never really agreed about it.
How bout
  token: uint .size 4

The 32bit unsign integer seems to be reasonable for the usage in teep.

Best,
-Akira

On Thu, Apr 9, 2020 at 9:12 PM Carsten Bormann <cabo@tzi.org> wrote:
>
> On 2020-04-09, at 14:07, Brendan Moran <Brendan.Moran@arm.com> wrote:
> >
> > From a SUIT perspective, I’m still inclined to make sure that this is tagged as that allows for use-cases that we may not have considered.
>
> Makes sense.  Let’s fix the definition of `SUIT-envelope` in the below.
>
> Henk and I created a cleaned up version of the CBOR encoding and accompanying CDDL.
> We should check whether this encoding helps us and then integrate it into the document.
>
> https://github.com/ietf-teep/teep-protocol/pull/27
>
> Grüße, Carsten
>
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