The newly-published 
https://www.ietf.org/archive/id/draft-ietf-hpke-hpke-03.html just solved the 
"info" size problem for JOSE and COSE.  It now says:



Implementations MUST support info values of at least 64 bytes. Implementations 
SHOULD support info values of at least 16384 bytes to accommodate protocols 
such as Encrypted Client Hello [I-D.ietf-tls-esni].



Thanks, HPKE WG!



                                                       -- Mike


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