Christian Heimes added the comment:
HMAC-SHA3 hasn't been standardized yet. I'm not even sure their will be an
official HMAC-SHA3 standard anytime soon. Keccak uses a sponge design that
isn't vulnerable to length extension attacks like Merkle–Damgård based hashing
algorithms (MD5, SHA-1, SHA-2).
My standalone package now contains some experimental code and tests based on
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