I meant to say "*couldn't* pinpoint a clear normative answer". Which i hope is clear from the rest of my email.
S pozdravem, *Filip Skokan* On Tue, 3 Nov 2020 at 22:50, Filip Skokan <[email protected]> wrote: > Hi Vladimir, > > I kinda got the same question from someone a couple days ago and could > pinpoint a clear normative answer. > > We have https://tools.ietf.org/html/rfc7520 that shows ECDH-ES with P-384 > and P-256. In not having any normative text around these curves being > allowed or P-521 being disallowed I always assumed all original three are > fair use for ECDH-ES (and its composite KW variants). > > We also have https://tools.ietf.org/html/rfc8037 which specifically > mentions X25519 and X448 OKP subtypes to be usable for ECDH-ES (and its > composite KW variants). > > Then we have the JOSE registration of EC secp256k1 curve which > specifically mentions that the curve is NOT released for ECDH in that > document. > > So, > > EC P-256 > EC P-384 > EC P-521 > OKP X25519 > OKP X448 > > S pozdravem, > *Filip Skokan* > > > On Tue, 3 Nov 2020 at 22:40, Vladimir Dzhuvinov <[email protected]> > wrote: > >> Today we received the question why the Nimbus JOSE+JWT lib supports the >> EC curves it does for ECDH (P-256, P-384, P-512) and I couldn't find any >> normative text or reference in the JWA spec to explain this. >> >> https://tools.ietf.org/html/rfc7518#section-4.6 >> >> >> We also looked at the IANA registry for hints: >> >> https://www.iana.org/assignments/jose/jose.xhtml >> >> >> Contrast this with the JWS ECDSA, where the curves to go with the ESxxx >> algs are specced: >> >> https://tools.ietf.org/html/rfc7518#section-3.4 >> >> >> Can someone help here? :) >> >> >> Thanks, >> >> Vladimir >> >> -- >> Vladimir Dzhuvinov >> >> >> _______________________________________________ >> jose mailing list >> [email protected] >> https://www.ietf.org/mailman/listinfo/jose >> >
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