2008-10-02 19:45:51 -04:00
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! Copyright (C) 2008 Doug Coleman.
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! See http://factorcode.org/license.txt for BSD license.
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2007-09-20 18:09:08 -04:00
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USING: kernel math math.functions ;
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IN: crypto.barrett
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: barrett-mu ( n size -- mu )
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2015-09-08 19:15:10 -04:00
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! Calculates Barrett's reduction parameter mu
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! size = word size in bits (8, 16, 32, 64, ...)
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2009-08-13 20:21:44 -04:00
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[ [ log2 1 + ] [ / 2 * ] bi* ]
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2008-10-02 19:45:51 -04:00
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[ 2^ rot ^ swap /i ] 2bi ;
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