Leonard, I see that the purely hash algorithm family SHAKE is defined in RFC 9054 [1], are these what you are looking for?
I had also started, but effectively abandoned, a small draft to add KMAC to COSE and JOSE [2] which is a SHA-3 derived MAC algorithm family. If this is something you are interested in, and there is WG support, the draft of just KMAC could be revived. Brian S. [1] https://datatracker.ietf.org/doc/html/rfc9054#section-3.3 [2] https://datatracker.ietf.org/doc/draft-sipos-cose-gmac-kmac/ From: Leonard Rosenthol <[email protected]> Sent: Wednesday, June 25, 2025 6:07 PM To: [email protected] Subject: [EXT] [COSE] Why is SHA-3 not supported in COSE? APL external email warning: Verify sender [email protected] <mailto:[email protected]> before clicking links or attachments Checking the current state of the COSE Algorithm Registry (https://www.iana.org/assignments/cose/cose.xhtml#algorithms) shows that it is not there. Is there a technical reason for this? Lack of interest by implementors? Other? I ask because we are getting requests to add it to the C2PA specification, but as we note in our spec (https://c2pa.org/specifications/specifications/2.2/specs/C2PA_Specification .html#_hashing) since the SHA-3 algorithms aren't on the list, we don't support it. Thanks in advance for the info. Leonard
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