2008-10-02 19:45:51 -04:00
|
|
|
! Copyright (C) 2008 Doug Coleman.
|
|
|
|
|
! See http://factorcode.org/license.txt for BSD license.
|
2007-09-20 18:09:08 -04:00
|
|
|
USING: kernel math math.functions ;
|
|
|
|
|
IN: crypto.barrett
|
|
|
|
|
|
|
|
|
|
: barrett-mu ( n size -- mu )
|
|
|
|
|
#! Calculates Barrett's reduction parameter mu
|
|
|
|
|
#! size = word size in bits (8, 16, 32, 64, ...)
|
2009-08-13 20:21:44 -04:00
|
|
|
[ [ log2 1 + ] [ / 2 * ] bi* ]
|
2008-10-02 19:45:51 -04:00
|
|
|
[ 2^ rot ^ swap /i ] 2bi ;
|
