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passlib.crypto._md4 -- fallback implementation of MD4

Helper implementing insecure and obsolete md4 algorithm.
used for NTHASH format, which is also insecure and broken,
since it's just md4(password).

Implementated based on rfc at http://www.faqs.org/rfcs/rfc1320.html

.. note::

This shouldn't be imported directly, it's merely used conditionally
    by ``passlib.crypto.lookup_hash()`` when a native implementation can't be found.
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.. attribute:: digest_size

size of md4 digest in bytes (16 bytes)

.. method:: update

update digest by appending additional content

.. method:: copy

create clone of digest object, including current state

.. method:: digest

return bytes representing md4 digest of current content

.. method:: hexdigest

return hexadecimal version of digest
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