13 lines
347 B
Factor
13 lines
347 B
Factor
! Copyright (C) 2008 Doug Coleman.
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! See http://factorcode.org/license.txt for BSD license.
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USING: kernel math sequences fry ;
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IN: crypto.xor
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: mod-nth ( n seq -- elt ) [ length mod ] [ nth ] bi ;
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ERROR: empty-xor-key ;
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: xor-crypt ( seq key -- seq' )
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[ empty-xor-key ] when-empty
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[ dup length <iota> ] dip '[ _ mod-nth bitxor ] 2map ;
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