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Create a signature object :class:`DssSigScheme` that
    can perform (EC)DSA signature or verification.

    .. note::
        Refer to `NIST SP 800 Part 1 Rev 4`_ (or newer release) for an
        overview of the recommended key lengths.

    Args:
        key (:class:`Crypto.PublicKey.DSA` or :class:`Crypto.PublicKey.ECC`):
            The key to use for computing the signature (*private* keys only)
            or for verifying one.
            For DSA keys, let ``L`` and ``N`` be the bit lengths of the modulus ``p``
            and of ``q``: the pair ``(L,N)`` must appear in the following list,
            in compliance to section 4.2 of `FIPS 186-4`_:

            - (1024, 160) *legacy only; do not create new signatures with this*
            - (2048, 224) *deprecated; do not create new signatures with this*
            - (2048, 256)
            - (3072, 256)

            For ECC, only keys over P-224, P-256, P-384, and P-521 are accepted.

        mode (string):
            The parameter can take these values:

            - ``'fips-186-3'``. The signature generation is randomized and carried out
              according to `FIPS 186-3`_: the nonce ``k`` is taken from the RNG.
            - ``'deterministic-rfc6979'``. The signature generation is not
              randomized. See RFC6979_.

        encoding (string):
            How the signature is encoded. This value determines the output of
            :meth:`sign` and the input to :meth:`verify`.

            The following values are accepted:

            - ``'binary'`` (default), the signature is the raw concatenation
              of ``r`` and ``s``. It is defined in the IEEE P.1363 standard.
              For DSA, the size in bytes of the signature is ``N/4`` bytes
              (e.g. 64 for ``N=256``).
              For ECDSA, the signature is always twice the length of a point
              coordinate (e.g. 64 bytes for P-256).

            - ``'der'``, the signature is a ASN.1 DER SEQUENCE
              with two INTEGERs (``r`` and ``s``). It is defined in RFC3279_.
              The size of the signature is variable.

        randfunc (callable):
            A function that returns random ``bytes``, of a given length.
            If omitted, the internal RNG is used.
            Only applicable for the *'fips-186-3'* mode.

    .. _FIPS 186-3: http://csrc.nist.gov/publications/fips/fips186-3/fips_186-3.pdf
    .. _FIPS 186-4: http://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.186-4.pdf
    .. _NIST SP 800 Part 1 Rev 4: http://nvlpubs.nist.gov/nistpubs/SpecialPublications/NIST.SP.800-57pt1r4.pdf
    .. _RFC6979: http://tools.ietf.org/html/rfc6979
    .. _RFC3279: https://tools.ietf.org/html/rfc3279#section-2.2.2
    )r+�derzUnknown encoding '%s'�d�ed25519z ECC key is not on a NIST P curver/zUnsupported key type Nzdeterministic-rfc6979z
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