diff --git a/sha256.lua b/sha256.lua
index 1e24326..73e1fe5 100644
--- a/sha256.lua
+++ b/sha256.lua
@@ -193,6 +193,9 @@ if print_debug_messages then
    print("   "..method)
 end
 
+-- For computercraft, use emulated mode for the sake of compatibility
+branch = "EMUL"
+
 
 --------------------------------------------------------------------------------
 -- BASIC 32-BIT BITWISE FUNCTIONS
@@ -208,8 +211,6 @@ if branch == "FFI" or branch == "LJ" or branch == "LIB32" then
 
    -- Your system has 32-bit bitwise library (either "bit" or "bit32")
 
-   -- ADJUSTED FOR COMPUTERCRAFT
-
    AND  = b.band                -- 2 arguments
    OR   = b.bor                 -- 2 arguments
    XOR  = b.bxor                -- 2..5 arguments
@@ -219,17 +220,17 @@ if branch == "FFI" or branch == "LJ" or branch == "LIB32" then
    SHR  = b.brshift
    -- ROL  = b.rol or b.lrotate    -- second argument is integer 0..31
    -- ROR  = b.ror or b.rrotate    -- second argument is integer 0..31
-   function ROL(x, n)
-      x = x % 2^32 * 2^n
-      local r = x % 2^32
-      return r + (x - r) / 2^32
-   end
+   --function ROL(x, n)
+   --   x = x % 2^32 * 2^n
+   --   local r = x % 2^32
+   --   return r + (x - r) / 2^32
+   --end
 
-   function ROR(x, n)
-      x = x % 2^32 / 2^n
-      local r = x % 1
-      return r * 2^32 + (x - r)
-   end
+   --function ROR(x, n)
+   --   x = x % 2^32 / 2^n
+   --   local r = x % 1
+   --   return r * 2^32 + (x - r)
+   --end
 
    NOT  = b.bnot                -- only for LuaJIT
    NORM = b.tobit               -- only for LuaJIT