the function name is arc4random but it's chacha20 http://marc.info/?l=openbsd-cvs&m=138065251627052&w=2
Re:LibreSSL on Gentoo
by AlyssaRowan on Sunday July 13, 2014 @06:37AM
(#8027068)
Indeed, that's my point: don't forget that the name is legacy and slightly misleading.
RC4 is about to get another public result against it, btw.
They are pretty damn useful when you're trying to do secure programming.
(Of course, arc4random should use ChaCha20.)