Messages in this thread | | | Date | Fri, 1 Feb 2002 15:36:26 -0500 | From | Jeff Garzik <> | Subject | Re: Continuing /dev/random problems with 2.4 |
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On Fri, Feb 01, 2002 at 12:27:14PM -0800, H. Peter Anvin wrote: > Peter Monta wrote: > > >>Anything that is meant to be a server really pretty much needs an > >>enthropy generator these days. > >> > > > > Many motherboards have on-board sound. Why not turn the mic > > gain all the way up and use the noise---surely there will be > > a few bits' worth? > > > > Perhaps there ought to be a way to give bits to the kernel's > > /dev/random input hopper from user space. > > > > > There already is. If I'm not completely mistaken, just write the raw data > to /dev/random, then there is an ioctl() saying "add N bits to the > entrophy counter."
Yep. The i810 RNG userspace daemon, rngd, does this. It reads from i810 RNG data from /dev/intel_rng, tests the data, and injects it back into /dev/random with the specified entropy bits. (zero bits by default, because we default to paranoia mode of not trusting, but that can and is usually increased)
Jeff
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