SHA-1 optimization -- 20% less instructions

[hackjealousy]

https://hashcat.net/p12/js-sha1exp_169.pdf

I can verify that the "known optimizations" exist in the public versions of the FPGA bitstreams.  (I.e., the unrolled ZTEX core or the fpgaminer core.)

The interesting thing is that the author claimed to have found this optimization (he calls it a weakness) in Q1 of 2011.  I'd be interested to know if any devices, including the ASICs, are using these optimizations.

[Gabi]

Don't bitcoin use sha-2?

[hackjealousy]

I can verify that the "known optimizations" exist in the public versions of the FPGA bitstreams.  (I.e., the unrolled ZTEX core or the fpgaminer core.)

Although I think I confused myself here.  As SHA256 is part of SHA-2.