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

Henk Birkholz <henk.birkholz@sit.fraunhofer.de> Thu, 09 April 2020 14:13 UTC

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To: Akira Tsukamoto <akira.tsukamoto@gmail.com>, Carsten Bormann <cabo@tzi.org>
CC: "suit@ietf.org" <suit@ietf.org>, Brendan Moran <Brendan.Moran@arm.com>, Akira Tsukamoto <akira.tsukamoto@aist.go.jp>, Jim Schaad <ietf@augustcellars.com>, teep <teep@ietf.org>, Hannes Tschofenig <Hannes.Tschofenig@arm.com>
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From: Henk Birkholz <henk.birkholz@sit.fraunhofer.de>
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Date: Thu, 9 Apr 2020 16:13:31 +0200
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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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Hello Akira,

in an array context, the name (aka label) is annotation only. It is not 
transferred over "the wire", so we did not bother to define a 
corresponding type.

In other words, you could simply omit "type: " and "token: " and nothing 
would change. It is annotation for humans, basically.

See https://tools.ietf.org/html/rfc8610#section-2.1

Viele Grüße,

Henk

On 09.04.20 15:38, Akira Tsukamoto wrote:
> 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
>>
>> _______________________________________________
>> TEEP mailing list
>> TEEP@ietf.org
>> https://www.ietf.org/mailman/listinfo/teep
> 
> _______________________________________________
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