[issue21965] Add support for Memory BIO to _ssl

[Geert Jansen]

Geert Jansen added the comment:

Maybe an example is useful on how the Memory BIO stuff can be used to implement SSL on top of a proactor event loop. I just added support for this to my Gruvi project in the branch "feat-memory-bio":

An "SslPipe" utility class that uses the memory BIOs:

https://github.com/geertj/gruvi/blob/feat-memory-bio/gruvi/ssl.py#L23

A PEP-3156 style transport:

https://github.com/geertj/gruvi/blob/feat-memory-bio/gruvi/ssl.py#L234

And a backport of this for Python 2.7, 3,3 and 3.4:

https://github.com/geertj/gruvi/blob/feat-memory-bio/gruvi/_sslcompat.c
https://github.com/geertj/gruvi/blob/feat-memory-bio/gruvi/sslcompat.py

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