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Date: Tue, 24 Apr 2012 21:12:07 -0300
From: Claudio André <>
Subject: Re: SHA-256 code from Bitcoin miners

Hi, I've been looking at these miners for a while. But since i'm not a 
criptographic guy, i haven't found (easy) good ideas.

But, now looking at some recent opencl files in this "cgminer", i 
noticed there are some ideas and/or probably the correct syntax of 
something i failed to use in the past.

I'll try the opencl usage part and i'll report.


Em 24-04-2012 20:36, Solar Designer escreveu:
> Hi,
> I think we should look at and consider for reuse suitably licensed
> SHA-256 implementations from Bitcoin miners.  Here's one:
> It includes 4-way SIMD implementations of SHA-256 for SSE2 and AltiVec,
> two optimized OpenCL kernels (one of them for GCN), and more.  (In fact,
> I found it by searching the web for GCN instruction names, which
> suggests that the kernel was optimized with specific generated
> instructions in consideration.)
> While this miner as a whole has recently been relicensed to GPLv3 (as
> far as I understand), most of the individual files we're interested in
> have their own license statements on them and are under much more
> relaxed licenses.  So we should be able to take them for modification
> and reuse in JtR.
> (non-GCN) is under GPLv3+, but perhaps we can start with
> an older version, which maybe was still under GPLv2 (I did not check yet).
> Alexander

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