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Open Source and information security mailing list archives
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Date: Fri, 4 Aug 2006 13:00:30 +0000 (GMT) From: moreau francis <francis_moreau2000@...oo.fr> To: Michael Buesch <mb@...sch.de> Cc: linux-kernel@...r.kernel.org Subject: Re : [HW_RNG] How to use generic rng in kernel space Michael Buesch wrote: > The dataflow is as follows: > HW-RNG -> userspace RNGD (through /dev/hwrng) -> the daemon > checks it for sanity and puts it back into the kernel through > /dev/random -> Your driver gets the data from the /dev/random > entropy pools. Is that also true for embedded systems ? I mean we may not found any rngd on these systems. One other question now: suppose that others drivers need to use random data during their inits. At this time userspace appli still not have been started. How does it work ? > This is very neccesary, because your HW-RNG may fail and > so you may unintentionally use non-random data, if you use > the random data from the RNG directly. > The data _must_ go through userspace rngd, which does FIPS > sanity checks on the data. Well I'm working on a secure SOC which have a randown hardware which is supposed to return true random data. I understand that some self tests on the random data are needed but doing them in userspace is suprising. thanks Francis - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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