Support for Unbalanced Oil and Vinegar in PQC?

[ed522]

I was working on a personal project, and I needed to choose a post-quantum signature scheme. The app was built around relatively few users signing many messages with one keypair (e.g. chat). This entails small signatures and unbounded signing.

My options were between lattice crypto with large keys and signatures, stateless hash with even larger signatures, and stateful hash with extremely awkward requirements.

I noticed that the BC PQC provider listed Rainbow as an option. This is based on UOV, but is thoroughly broken.

The best option for my (and many other) applications would be UOV. There seems to be a reference implementation floating around, alongside some custom ones.

Addition to the PQC package (and JCE provider) would be appreciated.