[Openid-specs-fapi] Duplicate kids in jwks
panva.ip at gmail.com
Fri Jan 17 21:42:27 UTC 2020
I don’t think it’s clear whether the intent was an errata or a proposal to the WG to further constrain the Connect certification profile.
I believe we could only do the latter.
Odesláno z iPhonu
> 17. 1. 2020 v 22:05, Brian Campbell via Openid-specs-fapi <openid-specs-fapi at lists.openid.net>:
> For better or worse JOSE allowed for duplicate kids and Connect didn't constrain it. So requiring uniqueness is a breaking change that an erratum shouldn't be doing. I guess that counts as a negative opinion towards the decision in https://bitbucket.org/openid/connect/issues/1127
>> On Fri, Jan 17, 2020 at 12:50 AM Joseph Heenan via Openid-specs-fapi <openid-specs-fapi at lists.openid.net> wrote:
>> Hi all,
>> I wanted to direct the FAPI working group to this discussion within the Connect working group:
>> Namely that duplicate kids are not permitted in JWKS.
>> A test for this was recently added to all the conformance tests, which caused one of the UK banks to opine:
>>> it is valid for the JWK endpoint to return multiple KID instances, one for each ‘alg’ supported?
>>> The spec calls for the alg PS256 or longer to be supported, so we also have (for instance) PS384, PS512. And although we may show a couple that we don’t need, my point is that it must be valid to show multiple key entries to support multiple valid alg values.
>> To some extent this seems a reasonable point, reusing a key across across two algs that can use the same key seems ok, and arguably perhaps better than having the key once without an ‘alg’ specified.
>> As this affects the FAPI certification tests, I wanted to check the FAPI WG agrees with the decision in https://bitbucket.org/openid/connect/issues/1127 - any opinions (positive & negative) would be great please.
>> Joseph Heenan
>> OpenID Certification Team
>> Openid-specs-fapi mailing list
>> Openid-specs-fapi at lists.openid.net
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