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| Started by | LABBE Corentin <clabbe.montjoie@gmail.com> |
|---|---|
| First post | 2016-10-28 14:50 +0200 |
| Last post | 2016-10-28 14:50 +0200 |
| Articles | 1 — 1 participant |
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Re: [PATCH] nvmem: sunxi-sid: SID content is not a valid source of randomness LABBE Corentin <clabbe.montjoie@gmail.com> - 2016-10-28 14:50 +0200
| From | LABBE Corentin <clabbe.montjoie@gmail.com> |
|---|---|
| Date | 2016-10-28 14:50 +0200 |
| Subject | Re: [PATCH] nvmem: sunxi-sid: SID content is not a valid source of randomness |
| Message-ID | <sxeLE-8o2-21@gated-at.bofh.it> |
On Tue, Oct 25, 2016 at 09:06:34AM +0200, Jean-Francois Moine wrote: > On Tue, 25 Oct 2016 07:38:55 +0200 > LABBE Corentin <clabbe.montjoie@gmail.com> wrote: > > > > On Sat, Oct 22, 2016 at 03:53:28PM +0200, Corentin Labbe wrote: > > > > Since SID's content is constant over reboot, > > > > > > That's not true, at least not across all the Allwinner SoCs, and > > > especially not on the A10 and A20 that this driver supports. > > > > > > > On my cubieboard2 (A20) > > hexdump -C /sys/devices/platform/soc\@01c00000/1c23800.eeprom/sunxi-sid0/nvmem > > 00000000 16 51 66 83 80 48 50 72 56 54 48 48 03 c2 75 72 |.Qf..HPrVTHH..ur| > > 00000010 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| > > * > > 00000100 16 51 66 83 80 48 50 72 56 54 48 48 03 c2 75 72 |.Qf..HPrVTHH..ur| > > 00000110 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| > > * > > 00000200 > > cubiedev ~ # reboot > > cubiedev ~ # hexdump -C /sys/devices/platform/soc\@01c00000/1c23800.eeprom/sunxi-sid0/nvmem > > 00000000 16 51 66 83 80 48 50 72 56 54 48 48 03 c2 75 72 |.Qf..HPrVTHH..ur| > > 00000010 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| > > * > > 00000100 16 51 66 83 80 48 50 72 56 54 48 48 03 c2 75 72 |.Qf..HPrVTHH..ur| > > 00000110 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| > > * > > 00000200 > > > > So clearly for me its constant. > > Even after power off/power on? Yes, even after remove of any power supply.
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