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

[Marc-Andre Lemburg]

Marc-Andre Lemburg added the comment:

Some more resources for FreeBSD:

 * /dev/random and /dev/urandom (symlink to /dev/random) ma page:
   https://www.freebsd.org/cgi/man.cgi?query=random&sektion=4

 * Developer discussion about /dev/random and its future from 2013:
   https://wiki.freebsd.org/201308DevSummit/Security/DevRandom
 
 * FreeBSD uses the Yarrow CPRNG for /dev/random:
   https://www.usenix.org/legacy/events/bsdcon02/full_papers/murray/murray_html/
   https://www.schneier.com/academic/archives/2000/01/yarrow-160.html

 * FreeBSD will likely switch to the new Fortuna successor of Yarrow in an upcoming release:
   https://www.schneier.com/academic/fortuna/

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