-callback authenticate(Message, Key, Nonce) -> MAC
                when
                    Message :: message(),
                    Key :: chacha20_key(),
                    Nonce :: chacha20_nonce(),
                    MAC :: poly1305_mac().

-callback decrypt(CipherText, CipherTag, AAD, IV, Key) -> PlainText | error
           when
               CipherText :: cipher_text(),
               CipherTag :: poly1305_mac(),
               AAD :: additional_authenticated_data(),
               IV :: chacha20_nonce(),
               Key :: chacha20_key(),
               PlainText :: binary().

-callback encrypt(PlainText, AAD, IV, Key) -> {CipherText, CipherTag}
           when
               PlainText :: plain_text(),
               AAD :: additional_authenticated_data(),
               IV :: chacha20_nonce(),
               Key :: chacha20_key(),
               CipherText :: cipher_text(),
               CipherTag :: poly1305_mac().

-callback verify(MAC, Message, Key, Nonce) -> boolean()
          when
              MAC :: poly1305_mac(),
              Message :: message(),
              Key :: chacha20_key(),
              Nonce :: chacha20_nonce().