]> cvs.zerfleddert.de Git - proxmark3-svn/commitdiff
CHG: removed a loop after suggestions that it was unnecessary.
authoriceman1001 <iceman@iuse.se>
Fri, 13 Mar 2015 07:59:07 +0000 (08:59 +0100)
committericeman1001 <iceman@iuse.se>
Fri, 13 Mar 2015 07:59:07 +0000 (08:59 +0100)
client/lualibs/precalc.lua

index 284c8b628a7156c843787d5c80d456376fbaef54..ce58998a86eeed8522c8ab2754dea76338a78571 100644 (file)
@@ -35,19 +35,10 @@ shifts[9]= { 0xD, 0xB, 0x0, 0x6, 0x6, 0x0, 0xB, 0xD, 0xA, 0xC, 0x7, 0x1, 0x1, 0x
 shifts[10]= { 0xe, 0x1, 0x1, 0xe, 0x1, 0xe, 0xe, 0x1, 0x1, 0xe, 0xe, 0x1, 0xe, 0x1, 0x1, 0xe }
 
 local function ApplyPermutationAndShifts( pos, value, nibble)
-       local el2bytes = shifts[pos]
-       local el2 = el2bytes[nibble+1] --one indexed
-       local shiftInit = el2bytes[1]
-       local permrow   = perm[shiftInit+1]
-       local j = 1
-       for i = 1,16 do
-               if permrow[i] == el2 then
-                       j = i
-                       break 
-               end
-       end
-       local rsbytes = perm[value+1]
-       local rs = rsbytes[j]
+       local shiftbytes = shifts[pos]
+       local shiftElem = shiftbytes[nibble+1] --one indexed
+       local shiftOne = shiftbytes[1]
+       local rs = bit32.bxor(value, bit32.bxor(shiftOne, shiftElem))
        return rs
 end
 
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