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Re: [jose] [COSE] JOSE/COSE RSA Kem without HPKE?

Ilari Liusvaara <ilariliusvaara@welho.com> Mon, 12 February 2024 21:15 UTC

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Date: Mon, 12 Feb 2024 23:15:08 +0200
From: Ilari Liusvaara <ilariliusvaara@welho.com>
To: cose <cose@ietf.org>, JOSE WG <jose@ietf.org>
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Subject: Re: [jose] [COSE] JOSE/COSE RSA Kem without HPKE?
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On Mon, Feb 12, 2024 at 02:15:45PM -0500, Russ Housley wrote:
> Orie:
> 
> I do not know if people see a need for KEM outside of HPKE in COSE
> and/or JOSE.  However, if they do, we want to specify it in a way
> that allows a crypto library to support it and CMS KEMRecipientInfo
> with the same API.

Well, all three are able to use the same fixed-parameter KEMs (HPKE
needs fixed-parameter KEM as well). However, the KDF step afterwards is
very different (It is already quite different in COSE and JOSE).




-Ilari

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