Re: [COSE] Assigning CBOR tags to key structures

Hi all!
Sorry to revive this 1 and half year old topic.

In the end we finally have no CBOR Tag for COSE_Key and COSE_KeySet, I
could not find at IANA (nor on the cose rev 24 document) :(
Was it discarded at the end, why? or there is a chance to still get
the tag at IANA?

Regards !

Renzo

------------

PS: some more details of why this can be useful follow:

More details on the Use Case: transporting a symmetric key with
COSE_Key , it has to be protected, so wrapped on an Encrypt0 message
(Tag 16);
Would be nice have a tag to identify that the payload is a Cose_key
object; it is true at the moment I can design the app to always expect
a keyobjet as the payload of an encrypt0 ... ; but I'm cutting
flexibility, or we can design a custom cbor structure, but we are
loosing on interoperability.
I have a coap server, with limited ram, and I have actually size only
for for two coap resources, so I can see I will have to overload some
functionality of this resource, particularly this is a sort of
"/authz-info" ace resource, that I will use to do authenticated key
establishment (oauth pop token provisioning), and other stuff, so
probably quite overloaded.

On Sun, Oct 11, 2015 at 8:22 PM, Jim Schaad <ietf@augustcellars.com> wrote:
> As a general rule, this makes sense to me.
>
> Jim
>
>
>> -----Original Message-----
>> From: Carsten Bormann [mailto:cabo@tzi.org]
>> Sent: Sunday, October 11, 2015 2:32 AM
>> To: Jim Schaad <ietf@augustcellars.com>
>> Cc: cose@ietf.org
>> Subject: Re: [COSE] Assigning CBOR tags to key structures
>>
>> I'd propose this rule:
>> If there is a media type, there should be a CBOR tag for those environments that
>> don't benefit from media types.
>> (And generally vice versa, unless we are using CBOR tags in other than top-level
>> positions.)
>>
>> Grüße, Carsten
>>
>>
>> Jim Schaad wrote:
>> > I am currently working on the IANA text for doing assignment of CBOR
>> > tags in COSE.
>> >
>> > There is a possibility to request tags for the KEY and KEY_SET maps in
>> > the document.  At the present time I have not done this.  Can anybody
>> > see a reason for asking for tags on these two elements other than
>> completeness?
>> > I.e. does anybody have a place where it would make sense to use the
>> > pre-defined tags rather than knowing either a key or key set is in
>> > this location (it is possible to distinguish between the two items
>> > based on the an array vs map tag.)
>> >
>> >
>> > Jim
>> >
>> >
>> > _______________________________________________
>> > COSE mailing list
>> > COSE@ietf.org
>> > https://www.ietf.org/mailman/listinfo/cose
>> >
>
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