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Date: Wed, 6 Feb 2013 18:03:28 +0400
From: Solar Designer <solar@...nwall.com>
To: john-dev@...ts.openwall.com
Subject: Re: NTLMv1 and MSCHAPv2
On Tue, Feb 05, 2013 at 08:24:40PM +0100, magnum wrote:
> Sure thing, somehow I misread what you wrote. This is now fixed, threshold is 100 c/r pairs and this is printed:
>
>
> netntlm: Note: slow loading. For short runs, try netntlm-naive instead (using
> --format=netntlm-naive). That version loads faster but runs slower.
>
>
> MSCHAPv2 got the same fixes too.
Great. Now should we adjust the format_name or algorithm_name for the
naive formats to indicate that they're naive (and different from the
newly sped up ones)? I think we should. Any specific suggestions?
Also, there's a problem on archs requiring alignment (and maybe a
slowdown on others). On 32-bit SPARC:
Benchmarking: MSCHAPv2 C/R MD4 DES [32/32]... Bus error
Benchmarking: NTLMv1 C/R MD4 DES (ESS MD5) [32/32]... Bus error
The fix is to change 21 to 22 on this line:
static uchar (*crypt_key)[22]; // NT hash
in both formats. 21 guarantees misalignment for 16-bit accesses to
every other crypt_key element. 22 guarantees 16-bit alignment, as long
as the first element is aligned (and this is guaranteed by other means).
Benchmarks in qemu-system-sparc on bull, with JtR unstable-jumbo patched
as above and built with:
gcc version 4.1.2 20061115 (prerelease) (Debian 4.1.1-21)
New:
Benchmarking: MSCHAPv2 C/R MD4 DES [32/32]... DONE
Many salts: 28033K c/s real, 28033K c/s virtual
Only one salt: 128760 c/s real, 128760 c/s virtual
Naive:
Benchmarking: MSCHAPv2 C/R MD4 DES [32/32]... DONE
Many salts: 102400 c/s real, 102400 c/s virtual
Only one salt: 46384 c/s real, 46384 c/s virtual
New:
Benchmarking: NTLMv1 C/R MD4 DES (ESS MD5) [32/32]... DONE
Many salts: 27577K c/s real, 27577K c/s virtual
Only one salt: 124704 c/s real, 124704 c/s virtual
Naive:
Benchmarking: NTLMv1 C/R MD4 DES (ESS MD5) [32/32]... DONE
Many salts: 106455 c/s real, 106455 c/s virtual
Only one salt: 48665 c/s real, 48665 c/s virtual
Alexander
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