fixed sha256.lua, included it in the kernel.

build.cfg

@@ -10,6 +10,7 @@ modules/drivers/kbd.lua
 modules/drivers/net.lua
 modules/lib/readline.lua
 modules/lib/shutil.lua
+modules/lib/sha256.lua
 modules/applications/luash.lua
 modules/applications/genkernel.lua
 modules/applications/skex2.lua

modules/lib/sha256.lua

@@ -7,10 +7,19 @@
 --
 -- Data card support added by https://github.com/SuPeRMiNoR2
 sha = {}
-do
+if component.data then
+  datac = component.data
+  function sha.sha256(data)
+   local d=component.data.sha256(data)
+   return (d:gsub('.',function(c)
+    return string.format("%02x", string.byte(c))
+   end))
+  end
+else
 local MOD = 2^32
 local MODM = MOD-1
 
+
 local function memoize(f)
   local mt = {}
   local t = setmetatable({}, mt)