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SHA-224 cryptographic hash algorithm.

SHA-224 belongs to the SHA-2_ family of cryptographic hashes.
It produces the 224 bit digest of a message.

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    >>>
    >>> h = SHA224.new()
    >>> h.update(b'Hello')
    >>> print h.hexdigest()

*SHA* stands for Secure Hash Algorithm.

.. _SHA-2: http://csrc.nist.gov/publications/fips/fips180-2/fips180-2.pdf
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