public static byte[] encryptString(String clearText)
	{
		Cipher aes;
		byte[] cipherText = null;
			try {
				aes = Cipher.getInstance("AES/ECB/PKCS5Padding");
				aes.init(Cipher.ENCRYPT_MODE, SellerBackEnd.getSymmetricKey());
				cipherText = aes.doFinal(clearText.getBytes());
			} catch (NoSuchAlgorithmException | NoSuchPaddingException | InvalidKeyException | IllegalBlockSizeException | BadPaddingException e) {
				System.out.println("error in encryptString");
				e.printStackTrace();
			}
		return cipherText;
	}