remove aes args from global scope

src/crypto/cipher/aes.js

@@ -442,9 +442,11 @@ function keyExpansion(key) {
       }
     }
   }
-  this.rounds = rounds;
+
-  this.rk = keySched;
+  return {
-  return this;
+    rounds: rounds,
+    rk: keySched
+  };
 }
 
 function AESencrypt(block, ctx) {