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        :param string: text with PEM-encoded private ECDSA key
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            ECPrivateKey ::= SEQUENCE {
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                version                   Version,
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                privateKey                PrivateKey,
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        :param extra_entropy: additional data that will be fed into the random
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        Create signature over data.

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        Create signature over digest using the probabilistic ECDSA algorithm.

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        instead of this one.

        :param digest: hash value that will be signed
        :type digest: :term:`bytes-like object`
        :param callable entropy: randomness source, os.urandom by default
        :param sigencode: function used to encode the signature.
            The function needs to accept three parameters: the two integers
            that are the signature and the order of the curve over which the
            signature was computed. It needs to return an encoded signature.
            See `ecdsa.util.sigencode_string` and `ecdsa.util.sigencode_der`
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        :param int k: a pre-selected nonce for calculating the signature.
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        :param bool allow_truncate: if True, the provided digest can have
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        :raises RSZeroError: in the unlikely event when "r" parameter or
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        :param int number: number to sign using the probabilistic ECDSA
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        :param callable entropy: entropy source, os.urandom by default
        :param int k: pre-selected nonce for signature operation. If unset
            it will be selected at random using the entropy source.

        :raises RSZeroError: in the unlikely event when "r" parameter or
            "s" parameter of the created signature is equal 0, as that would
            leak the key. Caller should try a better entropy source, retry with
            different 'k', or use the
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