Date: Mon, 15 Jul 2013 20:53:39 +0200 From: Katja Malvoni <kmalvoni@...il.com> To: john-dev@...ts.openwall.com Subject: Re: Parallella: bcrypt Hi Alexander, On Mon, Jul 15, 2013 at 7:21 PM, Solar Designer <solar@...nwall.com> wrote: > Hi Katja, > > On Mon, Jul 15, 2013 at 06:22:51PM +0200, Katja Malvoni wrote: > > [...] it can't be hardware problem because those cores sometimes > > return correct results > > I am not so sure it's not a hardware problem. How soon do the faults > start happening? Could it be overheating? I moved code out of JtR, took test vectors and looked at outputs. It varies, sometimes first incorrect value is after 4th iteration, sometimes it's already in 1st iteration. I ran it four times, first incorrect value appeared in iteration 5, 1, 1, and 5. On the other board in 4 runs first incorrect value appeared in iteration 2, 4, 1 and 1. When integrated in JtR and it fails self test (when return value from core that returned wrong value is tested), usually it's get_hash(13) or get_hash(15) (rarely get_hash(10)). I tried it again now, passed self test but after first run there were 12 non cracked passwords although they should be cracked. When I use 8 cores either all are cracked or 2 - 3 remain after first run. > Can you try on the other > board? Also, I may try adding some homebrew cooling for the Epiphany > chip to see if it makes any difference. (There's no heatsink on this > chip normally, and it's getting pretty hot.) > I tried other board, passed self test (Raw: 795 c/s real, 795 c/s virtual) but also didn't crack all the passwords from BF_tst.in (25 remained, all cores used). I ran self test again after cracking and it failed on get_hash(15). Katja Content of type "text/html" skipped
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