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        secret key as :class:`!bytes` or :class:`!unicode` (unicode will be encoded using utf-8).

    :param multipart:
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    :returns:
        By default, the returned function has the signature ``hmac(msg) -> digest output``.

        However, if ``multipart=True``, the returned function has the signature
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        calculate the HMAC digest so far.

        The returned object will also have a ``digest_info`` attribute, containing
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    :arg salt:
        salt string to use when generating key.
        may be :class:`!bytes` or :class:`unicode` (encoded using UTF-8).

    :param rounds:
        number of rounds to use to generate key.

    :arg keylen:
        number of bytes to generate (if omitted / ``None``, uses digest's native size)

    :returns:
        raw :class:`bytes` of generated key

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    :arg salt:
        salt string to use when generating key.
        may be :class:`!bytes` or :class:`unicode` (encoded using UTF-8).

    :param rounds:
        number of rounds to use to generate key.

    :arg keylen:
        number of bytes to generate.
        if omitted / ``None``, will use digest's native output size.

    :returns:
        raw bytes of generated key

    .. versionchanged:: 1.7

        This function will use the first available of the following backends:

        * `fastpbk2 <https://pypi.python.org/pypi/fastpbkdf2>`_
        * :func:`hashlib.pbkdf2_hmac` (only available in py2 >= 2.7.8, and py3 >= 3.4)
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              accum = digest
              for _ in irange(rounds - 1):
                  digest = keyed_hmac(digest)
                  accum ^= digest
              return accum

        However, no efficient way to implement "bytes ^ bytes" in python.
        Instead, using approach where we dynamically compile a helper function based
        on digest size.  Instead of a single `accum` var, this helper breaks the digest
        into a series of integers.

        It stores these in a series of`accum_<i>` vars, and performs `accum ^= digest`
        by unpacking digest and perform xor for each "accum_<i> ^= digest_<i>".
        this keeps everything in locals, avoiding excessive list creation, encoding or decoding,
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