Move arshift from bit.lua to bits.lua

nselib/bit.lua

@@ -81,22 +81,6 @@ function rshift(a, b)
     return a >> b
 end
 
---- Returns <code>a</code> arithmetically right-shifted by <code>b</code>
--- places.
--- @param a Number to perform the shift on.
--- @param b Number of shifts.
-function arshift(a, b)
-    if a < 0 then
-        if a % 2 == 0 then -- even?
-            return a // (1<<b)
-        else
-            return a // (1<<b) + 1
-        end
-    else
-        return a >> b
-    end
-end
-
 --- Returns the integer remainder of <code>a</code> divided by <code>b</code>.
 --
 -- REPLACEMENT: <code>a % b</code>

nselib/bits.lua

@@ -39,6 +39,21 @@ function reverse (n, size)
     return n
 end
 
+--- Returns <code>a</code> arithmetically right-shifted by <code>b</code>
+-- places.
+-- @param a Number to perform the shift on.
+-- @param b Number of shifts.
+function arshift(a, b)
+    if a < 0 then
+        if a % 2 == 0 then -- even?
+            return a // (1<<b)
+        else
+            return a // (1<<b) + 1
+        end
+    else
+        return a >> b
+    end
+end
 do
     local function test8 (a, b)
         local r = reverse(a, 8)

scripts/backorifice-brute.nse

@@ -1,4 +1,4 @@
-local bit = require "bit"
+local bits = require "bits"
 local bin = require "bin"
 local brute = require "brute"
 local creds = require "creds"
@@ -198,7 +198,7 @@ local backorifice =
       --calculate next seed
       seed = self:gen_next_seed(seed)
       --calculate encryption key based on seed
-      local key = bit.arshift(seed,16) & 0xff
+      local key = bits.arshift(seed,16) & 0xff
 
       crypto_byte = data_byte ~ key
       output = bin.pack("AC",output,crypto_byte)

scripts/backorifice-info.nse

@@ -1,4 +1,4 @@
-local bit = require "bit"
+local bits = require "bits"
 local bin = require "bin"
 local nmap = require "nmap"
 local shortport = require "shortport"
@@ -202,7 +202,7 @@ local function BOcrypt(data, password, initial_seed )
     --calculate next seed
     seed = gen_next_seed(seed)
     --calculate encryption key based on seed
-    local key = bit.arshift(seed,16) & 0xff
+    local key = bits.arshift(seed,16) & 0xff
 
     crypto_byte = data_byte ~ key
     output = bin.pack("AC",output,crypto_byte)