code: public static void encryptFile(File raw, File encryptedFile, String password) throws IOException {
          byte[] b = readBytes(raw);
          String encodedImage = Base64.encodeToString(b, Base64.DEFAULT);
          byte[] encryptedBytes = new RNCryptorNative().encrypt(encodedImage, password);
          writeBytes(encryptedFile, encryptedBytes);
      }
docs: Encrypts file using password
  @param raw the original file to be encrypted
  @param encryptedFile the result file
  @param password strong generated password
  @throws IOException