Length of the salt, in bytes.
        It is a value between 0 and ``emLen - hLen - 2``, where ``emLen``
        is the size of the RSA modulus and ``hLen`` is the size of the digest
        applied to the message to sign or verify.

        The salt is generated internally, you don't need to provide it.

        If not specified, the salt length will be ``hLen``.
        If it is zero, the signature scheme becomes deterministic.

        Note that in some implementations such as OpenSSL the default
        salt length is ``emLen - hLen - 2`` (even though it is not more
        secure than ``hLen``).

    *   *rand_func* (``callable``) --
        A function that returns random ``bytes``, of the desired length.
        The default is :func:`Cryptodome.Random.get_random_bytes`.

:return: a :class:`PSS_SigScheme` signature object
Ú	mask_funcNÚ
salt_bytesÚ	rand_funcz