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Anyone aware of such implementations for other languages (java, c#, etc)?

General implementation or a „from scratch“?

For general here is a list: https://pq-crystals.org/kyber/software.shtml

Note that there may be incompatibilities (as noted in the article) until NIST has published the final revisions. Some specifications are on Round 3 kyber, others are on FIPS 203.

This one will interoperate with Bouncy Castle (both Java and C#) as we both use FIPS 203 draft, but it won't interoperate with OQS simultaneously (three-way interop) as that is still on the Round 3 submission.

(Disclosure: BC is my employer)

Fair point.

How about liboqs from OpenQuantumSafe? It includes an implementation of most PQC primitives proposed to date:

https://github.com/open-quantum-safe/liboqs

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