Hi,

A couple of days ago there was a thread about /dev/arandom [1] and the 
consensus was to prefer /dev/urandom on OpenBSD.

Today I was working through the TLS configuration pages for the smtp(8) client 
for Postfix 3.x [2].

Under “TLS manager specific settings”, in reference to tlsmgr(8), there is the 
following:

“In order to feed its in-memory PRNG pool, the tlsmgr(8) reads entropy from an 
external source...Specify a good entropy source...be sure to only use 
non-blocking sources (on OpenBSD, use /dev/arandom when tlsmgr(8) complains 
about /dev/urandom timeout erros).”

In light of the message regarding /dev/arandom and /dev/urandom would it now be 
correct to use *ONLY* /dev/urandom on current versions of OpenBSD ?

Thanks,

- J

Sources:

[1] https://marc.info/?l=openbsd-misc&m=150796373110940&w=2
[2] https://www.postfix.org/TLS_README.html

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