Draft -14 now says "members that are common to multiple key types".  And the 
incorrectly numbered sections are actually gone.

                                                            -- Mike

From: Mike Jones
Sent: Wednesday, July 17, 2013 1:55 PM
To: 'Brian Campbell'; [email protected]<mailto:[email protected]>
Subject: RE: [jose] x5c, x5u, x5t don't apply to all key types

Thanks for noticing this.  How about "members that are common to all public key 
types"?

You're right about the section numbering.  I'll fix that.

                                                            Thanks again,
                                                            -- Mike

From: [email protected]<mailto:[email protected]> 
[mailto:[email protected]] On Behalf Of Brian Campbell
Sent: Wednesday, July 17, 2013 12:34 PM
To: [email protected]<mailto:[email protected]>
Subject: [jose] x5c, x5u, x5t don't apply to all key types

Section 3 of JWK [1] defines "members that are common to all key types" and 
includes among those members x5c, x5u and x5t. However, the x5X parameters are 
relevant only for half the key types defined in JWA - they don't really make 
sense for "oct" [2] or "PBKDF2" [3].
Not sure the best way to address this but it seems kind of awkward as it is. 
Maybe move them into the EC and RSA type definitions (or something common to 
both) or somehow add some qualifying text saying that they can only be used 
with key types utilizing public keys?
As I was looking up the URLs below I noticed that the section alignment in 
section 5 of JWA is a little off. I think 5.3.3 and 5.3.4 should probably be 
5.4 and 5.5 respectively. Right now they line up as though they were part of 
the RSA key type.

[1] http://tools.ietf.org/html/draft-ietf-jose-json-web-key-13#section-3
[2] 
http://tools.ietf.org/html/draft-ietf-jose-json-web-algorithms-13#section-5.3.3
[3] 
http://tools.ietf.org/html/draft-ietf-jose-json-web-algorithms-13#section-5.3.4
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