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Date: Mon, 17 Feb 2014 20:55:41 -0500
From: Bill Cox <>
Subject: More speed results

I've built a reworked version of NoelKDf using an upgraded SSE
optimized password hashing algorithm almost entirely motivated from
recent great ideas from Solar Designer.  If the user specifies more
than 1 thread, then 1 thread is devoted to multiplication-based
compute-time hardening.  All other threads hash memory as fast as they
can with an SSE friendly simple hash function.  I switched to Blake2
for faster crypto-strength hashing between blocks, and wrote two new
hash functions: a permutation for the multiplication compute time
hardening, and a simple one-way memory intensive SSE friendly hash
using ADD, XOR, and SHIFT.

If these trivial hash functions stand up to scrutiny, the performance
seems amazing.  Here's the numbers on my 3.4GHz quad-core Ivy Bridge
processor with 2 banks of 1,666MHz DDR3 memory, running Arch Linux:

Scrypt, single-threaded, with SSE enabled: 500MB in 1 second, 1GB/s bandwidth
upgraded NoelKDF, 2 threads (1 multiplication, 1 memory): 2GB in 0.39
seconds, 10.2GB/s bandwidth
upgraded NoelKDF, 3 threads (1 multiplication, 2 memory): 2GB in 0.31
seconds, 13GB/s bandwidth
memmove: 2GB in .23 seconds, 17.4GB/s bandwidth

The first benchmark ran 328201784 multiplication hashes, or about 2.9
seconds in the first benchmark of nothing but multiplications.  The
second one did 196605000 multiplications, or about 1.7 seconds.  The
multiplication compute hardening seems to be working quite well, while
not interfering with the memory hashing threads.

To keep the memory hashing thread from running faster than the
multiplication thread, once per block they read the multiplication
thread's result.


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