[issue17405] Add _Py_memset_s() to securely clear memory

[Antoine Pitrou]

Antoine Pitrou added the comment:

I think I still don't understand the use case within Python. Why would you want to clear the internal state of a hash object?
If you can read the computer's memory, you probably have access to sensitive data already?

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<http://bugs.python.org/issue17405>
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