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my @IP_INVERSE = ( 40,8,48,16,56,24,64,32, ... 34,2,42,10,50,18,58,26, 33,1,41,9,49,17,57,25 );
my @PC_1 = ( 57,49,41,33,25,17,9, ... 14,6,61,53,45,37,29, 21,13,5,28,20,12,4 );