On Wed, 2019-11-20 at 17:16 +0100, Stefan Wahren wrote: > Hi Stephen, > > Am 20.11.19 um 04:16 schrieb Stephen Brennan: > > This patch series enables support for the HWRNG included on the Raspberry > > Pi 4. It is simply a rebase of Stefan's branch [1]. I went ahead and > > tested this out on a Pi 4. Prior to this patch series, attempting to use > > the hwrng gives: > > > > $ head -c 2 /dev/hwrng > > head: /dev/hwrng: Input/output error > > > > After this series, the same command gives two random bytes. > > just a note: a more expressive test would be running rngtest (package > rng-tools) on this device. Just had a go at it, root@rpi4:~# rngtest -c 1000 < /dev/hwrng rngtest 2-unofficial-mt.14 Copyright (c) 2004 by Henrique de Moraes Holschuh This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. rngtest: starting FIPS tests... rngtest: bits received from input: 20000032 rngtest: FIPS 140-2 successes: 998 rngtest: FIPS 140-2 failures: 2 rngtest: FIPS 140-2(2001-10-10) Monobit: 0 rngtest: FIPS 140-2(2001-10-10) Poker: 1 rngtest: FIPS 140-2(2001-10-10) Runs: 0 rngtest: FIPS 140-2(2001-10-10) Long run: 1 rngtest: FIPS 140-2(2001-10-10) Continuous run: 0 rngtest: input channel speed: (min=1.284; avg=113.786; max=126.213)Kibits/s rngtest: FIPS tests speed: (min=17.122; avg=28.268; max=28.812)Mibits/s rngtest: Program run time: 172323761 microseconds AFAIR (Arch wiki) some small failures are acceptable. Regards, Nicolas
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