check_pass.js

check_password = Module.cwrap("login", "number", ["string"]);
function check_nums_on(pass, idx, len) {
  for (var i = 0; i < 10; i ++) {
    pass[idx] = i;
    if (idx + 1 < len) {
      check_nums_on(pass, idx + 1, len);
    } else {
      var pass_to_verify = "RH_CTF{" + pass.join("") + "}";
      console.log("the last bit, checking the password: " + pass_to_verify);
      result = check_password(pass_to_verify);
      if (result != 0) {
        console.log("Found the password:: " + password.join(""));
        return;
      }
    }
  }
}
function checknums(len) {
  password = Array(len)
  check_nums_on(password, 0, len)
}