cvs commit: src/sys/libkern arc4random.c
sam at errno.com
Fri Aug 15 12:17:49 PDT 2003
> In message <87953260.1060949270 at melange.errno.com>, Sam Leffler writes:
>> Note that the data generated by arc4random needs to be exported to user
>> apps for seeding crypto operations when operating in a chroot'd
>> environment where /dev/random is not available.
> I actually thought about that a bit, and I think "/dev/random" is
> a wrong concept.
> I think we should have a randomdata(2) system call instead.
> Having a /dev/random which is sometimes (chroot/jail) means that
> applications running under those circumstances are incredible fragile
> to spoofing by creating a fake "/dev/random" in some way.
openbsd defined a sysctl to get data from arc4random. They use this as a
fallback if /dev/random or similar is not available. Applications that
wanted to be paranoid about spoofing could use this directly. I have not
compared the goodness of the data from /dev/random and arc4random.
More information about the cvs-src