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Date: Fri, 17 Dec 2010 11:05:12 +0100
From: bartavelle <bartavelle@...il.com>
To: john-users@...ts.openwall.com
Subject: Re: several problems with JtR + jumbo 9 and/or omp-des-7
On 12/17/2010 06:52 AM, Solar Designer wrote:
> I can't reproduce this. It works fine for me, cracking all 3107 hashes
> in my test file. That's with a pure wordlist, no rules, though. Maybe
> there's a bug in the wordlist buffering introduced in the jumbo patches?
> A bug that is easily seen only in conjunction with rules and with a tiny
> wordlist? This code looked unreliable to me...
It seems to me the cmp_all logic is wrong. Output seems to be setup like
this, according to x86-64.S :
movdqa a, (128*base)+output8x(%rip); \
movdqa a3, (128*base)+16+output8x(%rip); \
movdqa b, (128*base)+32+output8x(%rip); \
movdqa b3, (128*base)+32+16+output8x(%rip); \
movdqa c, (128*base)+64+output8x(%rip); \
movdqa c3, (128*base)+64+16+output8x(%rip); \
movdqa d, (128*base)+96+output8x(%rip); \
movdqa d3, (128*base)+96+16+output8x(%rip);
A00A01A02A03A04A05A06A07B00B01B02B03B04B05B06B07C00C01C02C03C04C05C06C07D00D01D02D03D04D05D06D07
A10A11A12A13A14A15A16A17B10B11B12B13B14B15B16B17C10C11C12C13C14C15C16C17D10D11D12D13D14D15D16D17
A20A21A22A23A24A25A26A27B20B21B22B23B24B25B26B27C20C21C22C23C24C25C26C27D20D21D22D23D24D25D26D27
A30A31A32A33A34A35A36A37B30B31B32B33B34B35B36B37C30C31C32C33C34C35C36C37D30D31D32D33D34D35D36D37
The comparison code was :
for(;i<(NT_NUM_KEYS/2);i+=4)
if(b==output8x[i] || b==output8x[i+1] || b==output8x[i+2] ||
b==output8x[i+3] || b==output8x[i+4] || b==output8x[i+5] ||
b==output8x[i+6] || b==output8x[i+7])
return 1;
It looks like it compares the A's B's C's and D's of the first row,
while it should compare the B's of all four rows. I don't know how that
could work for you.
This seems to work for me :
for(;i<(NT_NUM_KEYS/8);i++)
if(b==output8x[i*32+8] || b==output8x[i*32+9] || b==output8x[i*32+10]
|| b==output8x[i*32+11] || b==output8x[i*32+12] || b==output8x[i*32+13]
|| b==output8x[i*32+14] || b==output8x[i*32+15])
I probably just produced the wrong fix, as you say it works well for
you, while it should not work at all based on my understanding of the
current code.
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