[issue18742] Abstract base class for hashlib

[Christian Heimes]

Christian Heimes added the comment:

* "Cryptographic Hash Function" is the correct technical term for algorithms like SHA-1. http://en.wikipedia.org/wiki/Cryptographic_hash_function

* PEP 452 is going to suggest that 3rd party libraries register their hash function as subclasses of the ABC.

* __slots__ are required for subclassing. All our ABCs in Python 3.x have __slots__

* I don't want to import yet another module just for the ABC. I'd rather not provide a sample implementation of hexdigest() if you think it is too slow.

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