[issue16113] Add SHA-3 and SHAKE (Keccak) support

[Christian Heimes]

Christian Heimes added the comment:

This patch implements SHA-3 and SHAKE for Python 3.6. The algorithm is provided by a slightly modified copy of the Keccak Code Package. I had to replace C++ comments and perform some minor cleanups.

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stage: needs patch -> patch review
Added file: http://bugs.python.org/file42764/SHA3-and-SHAKE-support-for-Python.patch

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