You should install luasocket first:

opkg install luascoket

Get your secret by enter following command to your browser address bar. Make sure you have already input your password in the password input box.

javascript:alert(RSAUtils.encryptedString(publickey, encodeURIComponent($("#userPassword").val())));void(0);

Put user.json near cclogin.lua:

{"username": "010203040506", "password": "your secret here"}

Copy all files to your router, run:

lua cclogin.lua login
lua cclogin.lua logout