code: public static @Nullable String decryptString(EncryptionKey encryptionKey, @Nullable byte[] encryptedBytes) throws NoSuchPaddingException,
  	                                                                                                                  InvalidAlgorithmParameterException,
  	                                                                                                                  NoSuchAlgorithmException,
  	                                                                                                                  IllegalBlockSizeException,
  	                                                                                                                  BadPaddingException,
  	                                                                                                                  InvalidKeyException,
  	                                                                                                                  EncryptionException {
  		byte[] decrypted = decrypt(encryptionKey, encryptedBytes);
  		return decrypted != null ? new String(decrypted) : null;
  	}
docs: region Decrypt