#51 hmac verification

lockbox/util/bit.lua

@@ -1,25 +1,19 @@
-local ok, e
-ok = nil
-if not ok then
-    ok, e = pcall(require, "bit") -- the LuaJIT one ?
-end
+-- modified (simplified) for ComputerCraft
+
+local ok, e = nil, nil
+
 if not ok then
     ok, e = pcall(require, "bit32") -- Lua 5.2
 end
+
 if not ok then
-    ok, e = pcall(require, "bit.numberlua") -- for Lua 5.1, https://github.com/tst2005/lua-bit-numberlua/
+    ok, e = pcall(require, "bit")
 end
+
 if not ok then
     error("no bitwise support found", 2)
 end
+
 assert(type(e) == "table", "invalid bit module")
 
--- Workaround to support Lua 5.2 bit32 API with the LuaJIT bit one
-if e.rol and not e.lrotate then
-    e.lrotate = e.rol
-end
-if e.ror and not e.rrotate then
-    e.rrotate = e.ror
-end
-
 return e