Miroslav Lichvar 6199a89170 util: add function to generate random bytes ...

Add a function to fill a buffer with random bytes which uses a better
PRNG than random(). Use arc4random() if it's available on the system.
Fall back to reading from /dev/urandom, which should be available on
all currently supported systems.

2015-11-16 10:26:14 +01:00

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