From: iceman1001 <iceman@iuse.se>
Date: Fri, 13 Mar 2015 07:59:07 +0000 (+0100)
Subject: CHG: removed a loop after suggestions that it was unnecessary.
X-Git-Url: http://cvs.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/commitdiff_plain/c387fd49a705aa235d357a7296ba8a19bd45de36?hp=3e4811c8b77f4e3d84ed681f6b49704a18c2b3c4

CHG: removed a loop after suggestions that it was unnecessary.
---

diff --git a/client/lualibs/precalc.lua b/client/lualibs/precalc.lua
index 284c8b62..ce58998a 100644
--- a/client/lualibs/precalc.lua
+++ b/client/lualibs/precalc.lua
@@ -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