Re: [jose] RFC 8037 "alg" quirkiness
Anders Rundgren <anders.rundgren.net@gmail.com> Sun, 20 September 2020 06:25 UTC
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To: Jim Schaad <ietf@augustcellars.com>, jose@ietf.org
References: <1a84f81d-c7bd-9961-9f5c-e6c358fc1095@gmail.com> <039901d68ed6$2ed27ba0$8c7772e0$@augustcellars.com>
From: Anders Rundgren <anders.rundgren.net@gmail.com>
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Date: Sun, 20 Sep 2020 08:24:56 +0200
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Subject: Re: [jose] RFC 8037 "alg" quirkiness
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On 2020-09-20 00:42, Jim Schaad wrote: > Jumping back to the start. It seems that your mail system generates duplicates. FWIW, here is how the quirk manifests itself in my JOSE library: JSONObjectWriter setSignatureAlgorithm(JSONObjectWriter joseObject, SignatureAlgorithms signatureAlgorithm) { return joseObject.setString("alg", signatureAlgorithm.isOkp() ? "EdDSA" : signatureAlgorithm.getAlgorithmId()); } Presumably few cryptographic API's accept "EdDSA" as a signature algorithm. You could indeed have used "EdDSA" as signature algorithm in RFC 8410 but you did not and IMO you did the right choice. Anyway, navigating in crypto-land is often a bit challenging: https://mail.openjdk.java.net/pipermail/security-dev/2020-August/022348.html I've made my point, nothing more to add on my side :) Anders > > -----Original Message----- > From: jose <jose-bounces@ietf.org> On Behalf Of Anders Rundgren > Sent: Saturday, August 29, 2020 11:58 PM > To: jose@ietf.org > Subject: [jose] RFC 8037 "alg" quirkiness > > I have just implemented support for Edwards curves in my JSON library. > > Although it is certainly not a deal-breaker I find the use of "EdDSA" as a > generic Edwards algorithm identifier rather quirky since it departs from the > other JWS algorithms: > https://tools.ietf.org/html/rfc8037#appendix-A.4 > > [JLS] I do not find this at all in consistent with the way that the other > signature algorithms were handled, but that may just be me. For the ECDSA > algorithms, the size of the hash is specified because it could be variable > across the different curve sizes. So you can do ECDSA with SHA-512 and > P-256. The requirement to specify the hash was needed to bring the number > of options down to just those that are fixed by the curve. > > [JLS] For EdDSA, the hash function is fixed by the curve. This would change > if different hash functions where allowed for the same curve but I do not > believe that this where ever be in danger of happening because it was > strongly argued that a single hash function was the correct approach. Since > there was not a need to specify the hash function independent of the key, > there was no need to specify an EdDSA with SHA-512 and an EdDSA with > SHAKE-256 it was not done. > > Jim > > > For curiosity reasons I took a peek at the initial draft which has (in my > opinion...) a more logical solution: > https://tools.ietf.org/html/draft-liusvaara-jose-cfrg-curves-00#appendix-A.4 > > May I ask why this change was performed? > > For JSF (JSON Signature Format) I will stick to the "00" scheme which also > permits use of ed25519ph and friends if needed: > https://mobilepki.org/jsf-lab/home > > thanx, > Anders > > _______________________________________________ > jose mailing list > jose@ietf.org > https://www.ietf.org/mailman/listinfo/jose >
- Re: [jose] RFC 8037 "alg" quirkiness Neil Madden
- [jose] RFC 8037 "alg" quirkiness Anders Rundgren
- Re: [jose] RFC 8037 "alg" quirkiness Ilari Liusvaara
- Re: [jose] RFC 8037 "alg" quirkiness Anders Rundgren
- Re: [jose] RFC 8037 "alg" quirkiness Neil Madden
- Re: [jose] RFC 8037 "alg" quirkiness Ilari Liusvaara
- Re: [jose] RFC 8037 "alg" quirkiness Anders Rundgren
- Re: [jose] RFC 8037 "alg" quirkiness Benjamin Kaduk
- Re: [jose] RFC 8037 "alg" quirkiness Anders Rundgren
- Re: [jose] RFC 8037 "alg" quirkiness Jim Schaad
- Re: [jose] RFC 8037 "alg" quirkiness Anders Rundgren
- Re: [jose] RFC 8037 "alg" quirkiness Jim Schaad
- Re: [jose] RFC 8037 "alg" quirkiness Anders Rundgren
- Re: [jose] RFC 8037 "alg" quirkiness Jim Schaad
- Re: [jose] RFC 8037 "alg" quirkiness Anders Rundgren