[issue27279] Add random.cryptorandom() and random.pseudorandom, deprecate os.urandom()

[Marc-Andre Lemburg]

Marc-Andre Lemburg added the comment:

Some resources:

 * getrandom() man page:
   http://man7.org/linux/man-pages/man2/getrandom.2.html

 * nice readup on how getrandom() was introduced:
   https://lwn.net/Articles/606141/

 * random devices implementation on Linux:
   http://lxr.free-electrons.com/source/drivers/char/random.c

 * getrandom() implementation on Linux:
   http://lxr.free-electrons.com/source/drivers/char/random.c#L1601
   (built straight on opt of the device APIs)

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<http://bugs.python.org/issue27279>
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