phc-discussions - Re: [PHC] multiply-hardening (Re: NoelKDF ready for submission)

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Message-ID: <20140208082134.GA9003@openwall.com>
Date: Sat, 8 Feb 2014 12:21:34 +0400
From: Solar Designer <solar@...nwall.com>
To: discussions@...sword-hashing.net
Subject: Re: [PHC] multiply-hardening (Re: NoelKDF ready for submission)

On Sat, Feb 08, 2014 at 12:00:30PM +0400, Solar Designer wrote:
> As an option, you might want to reuse the operations and the constant
> used in Mersenne twister's initialization:
> 
> #define NEXT_STATE(x, i) \
> 	(x) = 1812433253U * ((x) ^ ((x) >> 30)) + (i);
> 
> where "x" is the current state (32-bit) and "i" is the iteration number.

There's a lot of additional info here:

http://www.math.sci.hiroshima-u.ac.jp/~m-mat/MT/emt.html

including 64-bit and SIMD twisters (not just implementations of the
32-bit MT19937).

Also, see init_by_array() in:

http://www.math.sci.hiroshima-u.ac.jp/~m-mat/MT/MT2002/CODES/mt19937ar.c
http://www.math.sci.hiroshima-u.ac.jp/~m-mat/MT/VERSIONS/C-LANG/mt19937-64.c

This function uses different constants, and has an init_key[] input -
this might fit your needs better.

Alexander