search for: entropy_save_num

On Sun, Jul 24, 2005 at 04:06:02PM +0200, Poul-Henning Kamp wrote: +> In message <20050724135738.GM46538@darkness.comp.waw.pl>, Pawel Jakub Dawidek writes: +> +> >We should probably test entropy quality on boot. +> >I've somewhere userland version of /sys/dev/rndtest/ which implements +> >FIPS140-2 tests for (P)RNGs. We can use put it into rc.d/ and warn users.

Hi. I experimented a bit with collecting entropy from the time it takes for device_attach() to run (in CPU cycles). It seems that those times have enough variation that we can use it for entropy harvesting. It happens even before root is mounted, so pretty early. On the machine I'm testing it, which has minimal kernel plus NIC driver I see 75 device_attach() calls. I'm being very careful