All, I was looking in the COSE algorithms registry [1] for any existing allocations for GMAC uses but don't see any. My reason for looking was that in some hardware-accelerated environments AES-GCM is faster than HMAC processing, so a GMAC would also benefit from the acceleration.
I expect that a COSE use of AES-GMAC would look similar to the use in CMS [2] except that COSE algorithms typically combine options like authentication tag size into a single code point, so an initial thought would be max-length tags like: AES-GMAC 128/128, AES-GMAC 192/128, AES-GMAC 256/128 Would there be WG interest in allocating GMAC algorithms in the near-term time supporting max-length tags? Thanks, Brian S. [1] https://www.iana.org/assignments/cose/cose.xhtml#algorithms [2] https://datatracker.ietf.org/doc/html/rfc9044
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