-callback authenticate(Message, Key, Nonce) -> MAC
                          when
                              Message :: message(),
                              Key :: xchacha20_key(),
                              Nonce :: xchacha20_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 :: xchacha20_nonce(),
                         Key :: xchacha20_key(),
                         PlainText :: binary().

-callback encrypt(PlainText, AAD, IV, Key) -> {CipherText, CipherTag}
                     when
                         PlainText :: plain_text(),
                         AAD :: additional_authenticated_data(),
                         IV :: xchacha20_nonce(),
                         Key :: xchacha20_key(),
                         CipherText :: cipher_text(),
                         CipherTag :: poly1305_mac().

-callback verify(MAC, Message, Key, Nonce) -> boolean()
                    when
                        MAC :: poly1305_mac(),
                        Message :: message(),
                        Key :: xchacha20_key(),
                        Nonce :: xchacha20_nonce().