lib/des/doIP

   1 #!/usr/local/bin/perl
   2
   3 @l=(
   4          0, 1, 2, 3, 4, 5, 6, 7,
   5          8, 9,10,11,12,13,14,15,
   6         16,17,18,19,20,21,22,23,
   7         24,25,26,27,28,29,30,31
   8         );
   9 @r=(
  10         32,33,34,35,36,37,38,39,
  11         40,41,42,43,44,45,46,47,
  12         48,49,50,51,52,53,54,55,
  13         56,57,58,59,60,61,62,63
  14         );
  15
  16 require 'shifts.pl';
  17
  18 sub PERM_OP
  19         {
  20         local(*a,*b,*t,$n,$m)=@_;
  21
  22         @z=&shift(*a,-$n);
  23         @z=&xor(*b,*z);
  24         @z=&and(*z,$m);
  25         @b=&xor(*b,*z);
  26         @z=&shift(*z,$n);
  27         @a=&xor(*a,*z);
  28         }
  29
  30
  31 @L=@l;
  32 @R=@r;
  33 &PERM_OP(*R,*L,*T,4,0x0f0f0f0f);
  34 &PERM_OP(*L,*R,*T,16,0x0000ffff);
  35 &PERM_OP(*R,*L,*T,2,0x33333333);
  36 &PERM_OP(*L,*R,*T,8,0x00ff00ff);
  37 &PERM_OP(*R,*L,*T,1,0x55555555);
  38         &printit(@L);
  39         &printit(@R);
  40 &PERM_OP(*R,*L,*T,1,0x55555555);
  41 &PERM_OP(*L,*R,*T,8,0x00ff00ff);
  42 &PERM_OP(*R,*L,*T,2,0x33333333);
  43 &PERM_OP(*L,*R,*T,16,0x0000ffff);
  44 &PERM_OP(*R,*L,*T,4,0x0f0f0f0f);
  45         &printit(@L);
  46         &printit(@R);