This does the extraction (e.g., it decrypts the image and writes it to a new file on disk).

def _decrypt_and_extract(self, fname):
        '''
        This does the extraction (e.g., it decrypts the image and writes it to a new file on disk).
        '''
        with open(fname, "r") as fp_in:
            encrypted_data = fp_in.read()

            decrypted_data = self._hilink_decrypt(encrypted_data)

            with open(binwalk.core.common.unique_file_name(fname[:-4], "dec"), "w") as fp_out:
                fp_out.write(decrypted_data)