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

Akira Tsukamoto <akira.tsukamoto@aist.go.jp> Thu, 09 April 2020 23:43 UTC

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To: Henk Birkholz <henk.birkholz@sit.fraunhofer.de>, Akira Tsukamoto <akira.tsukamoto@gmail.com>, Carsten Bormann <cabo@tzi.org>
Cc: "suit@ietf.org" <suit@ietf.org>, Brendan Moran <Brendan.Moran@arm.com>, Jim Schaad <ietf@augustcellars.com>, teep <teep@ietf.org>, Hannes Tschofenig <Hannes.Tschofenig@arm.com>
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From: Akira Tsukamoto <akira.tsukamoto@aist.go.jp>
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Date: Fri, 10 Apr 2020 08:43:37 +0900
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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 Henk,

Thanks for you comment.
I now am perfectly clear about the label name is just annotation for array in cddl.

Best,
-Akira

On 4/9/2020 11:13 PM, Henk Birkholz wrote:
> 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://jpn01.safelinks.protection.outlook.com/?url=https%3A%2F%2Ftools.ietf.org%2Fhtml%2Frfc8610%23section-2.1&amp;data=02%7C01%7Cakira.tsukamoto%40aist.go.jp%7C85cf47c432354e5fa73a08d7dc903817%7C18a7fec8652f409b8369272d9ce80620%7C0%7C0%7C637220384303337245&amp;sdata=%2B%2Bm5aUI2zpFdEXec5dNElG4KNhC%2B60TeUDxMcXjtGqo%3D&amp;reserved=0
> 
> Viele Grüße,
> 
> Henk
> 
> On 09.04.20 15:38, Akira Tsukamoto wrote:
>> Hi Carsten and Hannes,
>>
>> https://jpn01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fietf-teep%2Fteep-protocol%2Fpull%2F27&amp;data=02%7C01%7Cakira.tsukamoto%40aist.go.jp%7C85cf47c432354e5fa73a08d7dc903817%7C18a7fec8652f409b8369272d9ce80620%7C0%7C0%7C637220384303337245&amp;sdata=ZDVr31cNQdQNR5H2bcvnC%2Bj7m%2BDgVz1kIe4us99%2B%2BsA%3D&amp;reserved=0
>>
>> 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://jpn01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fietf-teep%2Fteep-protocol%2Fpull%2F27&amp;data=02%7C01%7Cakira.tsukamoto%40aist.go.jp%7C85cf47c432354e5fa73a08d7dc903817%7C18a7fec8652f409b8369272d9ce80620%7C0%7C0%7C637220384303337245&amp;sdata=ZDVr31cNQdQNR5H2bcvnC%2Bj7m%2BDgVz1kIe4us99%2B%2BsA%3D&amp;reserved=0
>>>
>>> Grüße, Carsten
>>>
>>> _______________________________________________
>>> TEEP mailing list
>>> TEEP@ietf.org
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>>
>> _______________________________________________
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