Tested w/ vectors from C reference impl `genkat_crypto_aead_ascon80pqv12_ref.exe` like this
```
if __name__ == "__main__":
    variant = "Ascon-80pq"
    key   = bytes.fromhex("000102030405060708090A0B0C0D0E0F10111213")
    nonce = bytes.fromhex("000102030405060708090A0B0C0D0E0F")
    associateddata = bytes.fromhex("000102030405")
    plaintext      = bytes.fromhex("000102030405")
    ciphertext        = ascon_encrypt(key, nonce, associateddata, plaintext,  variant)
    receivedplaintext = ascon_decrypt(key, nonce, associateddata, ciphertext, variant)
    demo_print([("key", key),
                ("nonce", nonce),
                ("plaintext", plaintext),
                ("ass.data", associateddata),
                ("ciphertext", ciphertext[:-16]),
                ("tag", ciphertext[-16:]),
                ("received", receivedplaintext),
               ])
```