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Message-ID: <20150806132120.GA18936@openwall.com>
Date: Thu, 6 Aug 2015 16:21:20 +0300
From: Solar Designer <solar@...nwall.com>
To: john-dev@...ts.openwall.com
Subject: Re: JtR on ARM (NEON)
On Mon, Aug 03, 2015 at 04:53:39PM +0800, Lei Zhang wrote:
> I got your points. NEON's vbsl works just as a vcmov.
>
> With the 2-intruction emulation of vroti, PBKDF2-HMAC-SHA256 got a boost from 644 c/s real to 976 c/s real. Other formats saw no significant performance change.
Cool. Maybe other formats will see a boost when interleaved.
> However, I have some problem with the emulation of vroti. Literally, it should be defined this way:
>
> #define vroti_epi32(x, i) \
> (i > 0 ? vsliq_n_u32(vshrq_n_u32(x, 32 - (i)), x, i) : \
> vsriq_n_u32(vshlq_n_u32(x, 32 + (i)), x, -(i)))
>
> Somehow it won't compile when and only when building rawSHA1_ng_fmt_plug.o, giving some cryptic error message:
>
> /tmp/ccgVmq2d.s: Assembler messages:
> /tmp/ccgVmq2d.s:4397: Error: co-processor offset out of range
You may capture this assembly output and see what's on that line, then
try to match it back to a source code line. But yes, I think it's a
compiler bug.
> The version of gcc used is 4.6.4. Unfortunately, there's currently no easy way of upgrading gcc on my mate's board. Solar, do you have a newer gcc on your ARM board?
No, IIRC it's 4.6.x as well. But we can build a newer version from
source. It will take ages, but should work.
Alexander
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