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

    >>> from Crypto.Hash import MD4
    >>>
    >>> 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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                        int md4_init(void **shaState);
                        int md4_destroy(void *shaState);
                        int md4_update(void *hs,
                                          const uint8_t *buf,
                                          size_t len);
                        int md4_digest(const void *shaState,
                                          uint8_t digest[20]);
                        int md4_copy(const void *src, void *dst);
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