On 2/12/26 8:55 AM, Michael Richardson wrote:
Robert Moskowitz <[email protected]> wrote: > subjectAltName (SAN) IPv4 (aircraft's 24-bit number prefixed with ZERO) What's that? It does not sound like a v4-address... are just abusing this SAN?
Yes, I am hacking the 24-bit aircraft number (24AN) into IPv4 space by setting the first octet at ZERO. There is no good OID for this thing. "Common practice" for many airlines is to put it in CN= in subject.
My hack is at least recogonizable over all the different uses of CN= by aviation. Plus 24AN is assigned in blocks, of varying sizes, to each member state. The size was determined on usage patterns some years ago. Thus at the issuer level, IPv4Network could be used and for US it would be 0.160.0.0/12 (though probably subdivided for civil and gov spaces). Kyrgyzstan has 0.96.16.0/22; and probably does not subdivide their space.
I don't remember if C509 let's us define extensions in pure CDDL/CBOR. I think not...
Nope. If it is not in 5280, you have to get creative. Bob
-- Michael Richardson <[email protected]>, Sandelman Software Works -= IPv6 IoT consulting =- *I*LIKE*TRAINS*
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