Feature request: Support :poly1305+chacha20

[ysangkok]

As specified in RFC 8439 and used in the Lightning Protocol (BOLT-08).

[ysangkok]

If you need this, you can use http://GITHUB.COM/lvh/caesium or (Java 11)

(defn javaenc [msg iv keyb]
  (let [mamboSpec (javax.crypto.spec.IvParameterSpec. iv)
         k4 (javax.crypto.spec.SecretKeySpec. keyb "ChaCha20")
         ci (doto (javax.crypto.Cipher/getInstance "ChaCha20-Poly1305")
                  (.init javax.crypto.Cipher/ENCRYPT_MODE k4 mamboSpec))]
       (->
         (.doFinal ci msg)
         (hexlify))))

IV is 12 bytes. Key is 32 bytes.

[niwinz]

PR welcome ;)