multibackend.py 文件源码

def generate_dsa_private_key_and_parameters(self, key_size):
        for b in self._filtered_backends(DSABackend):
            return b.generate_dsa_private_key_and_parameters(key_size)
        raise UnsupportedAlgorithm("DSA is not supported by the backend.",
                                   _Reasons.UNSUPPORTED_PUBLIC_KEY_ALGORITHM)