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

Laurence Lundblade <lgl@island-resort.com> Tue, 22 March 2022 08:02 UTC

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From: Laurence Lundblade <lgl@island-resort.com>
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Date: Tue, 22 Mar 2022 09:01:49 +0100
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Cc: Orie Steele <orie@transmute.industries>, =?utf-8?Q?G=C3=B6ran_Selander?= <goran.selander@ericsson.com>, "cose@ietf.org" <cose@ietf.org>
To: Michael Richardson <mcr+ietf@sandelman.ca>
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Subject: Re: [COSE] Key identifier of type bstr / int
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> On Mar 21, 2022, at 11:20 PM, Michael Richardson <mcr+ietf@sandelman.ca> wrote:
> 
> Laurence Lundblade <lgl@island-resort.com <mailto:lgl@island-resort.com>> wrote:
>> Let me try to be more clear.
> 
>> The COSE standard now is:
> 
>>   kid => bstr
> 
>> If we make this change:
> 
>>   kid => int / bstr
> 
>> then we break backwards compatibility for COSE as Mike pointed out
> 
> I don't think that this breaks *compatibility*
> Old signed objects are still valid.

I guess you are right.

If you give 

    kid => int

to an existing implementation it will say “kid is in the wrong format”

If you give
   
   Intkid => int

to an existing implémentation it will say “there is no kid”

Can’t see it matters that much which.

LL

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