for (callback in callbacks) {
      if (callback is PasswordCallback) {
        val console = System.console()

        if (console != null) {
          callback.password = console.readPassword(callback.prompt)
        } else {
          System.err.println(callback.prompt)
          callback.password = System.`in`.bufferedReader().readLine().toCharArray()
        }
      } else {

            if (passwd == null) {
                Console cons = System.console();
                char[] password = (cons == null) ? null : cons.readPassword("Password: ");
                if (password != null) {
                    // Cipher uses Strings
                    passwd = String.copyValueOf(password);