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MD4 cryptographic hash algorithm.

MD4 is specified in RFC1320_ and produces the 128 bit digest of a message.

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    >>>
    >>> h = MD4.new()
    >>> h.update(b'Hello')
    >>> print h.hexdigest()

MD4 stand for Message Digest version 4, and it was invented by Rivest in 1990.

This algorithm is insecure. Do not use it for new designs.

.. _RFC1320: http://tools.ietf.org/html/rfc1320
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