I'm pretty sure they are exactly the same on many of the BSDs. * OpenBSD: /dev/random + /dev/urandom are the same and use ChaCha20. * FreeBSD: They are the sa

I'm pretty sure they are exactly the same on many of the BSDs. * OpenBSD: /dev/random + /dev/urandom are the same and use ChaCha20. * FreeBSD: They are the same (via symlink) and use RC4. Soon will use ChaCha20. * NetBSD: Unsure. Last I checked, /dev/random was broken/non-functional like on Linux, and /dev/urandom was slow, like on Linux. * Dragonfly BSD: Somewhat unsure, but ChaCha output can be xor'd with another stream to produce the returned random numbers. * Bitrig: when it is released, it will use ChaCha20 like OpenBSD. Related: libbsd currently uses RC4 in its arc4random functions but has publicly stated a future switch to ChaCha20.