[issue16113] Add SHA-3 (Keccak) support

[Gregory P. Smith]

Gregory P. Smith added the comment:

don't worry about optimization settings in python itself for now.  the canonical optimized version will be in a future openssl version.  now that it has been declared the standard it will get a *lot* more attention in the next few years.

as it is, we _may_ want to replace this reference implementation with one from libtomcrypt in the future when it gets around to implementing it just so that the code for all of our bundled hash functions comes from the same place.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue16113>
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