require improvements, remove global Util

sys/apis/security.lua

@@ -0,0 +1,56 @@
+local Config = require('config')
+
+local config = { }
+
+local Security = { }
+
+function Security.verifyPassword(password)
+  Config.load('os', config)
+  return config.password and password == config.password
+end
+
+function Security.getSecretKey()
+  Config.load('os', config)
+  if not config.secretKey then
+    config.secretKey = math.random(100000, 999999)
+    Config.update('os', config)
+  end
+  return config.secretKey
+end
+
+function Security.getPublicKey()
+
+  local exchange = {
+    base = 11,
+    primeMod = 625210769
+  }
+
+  local function modexp(base, exponent, modulo)
+    local remainder = base
+
+    for i = 1, exponent-1 do
+      remainder = remainder * remainder
+      if remainder >= modulo then
+        remainder = remainder % modulo
+      end
+    end
+
+    return remainder
+  end
+
+  local secretKey = Security.getSecretKey()
+  return modexp(exchange.base, secretKey, exchange.primeMod)
+end
+
+function Security.updatePassword(password)
+  Config.load('os', config)
+  config.password = password
+  Config.update('os', config)
+end
+
+function Security.getPassword()
+  Config.load('os', config)
+  return config.password
+end
+
+return Security