Method encrypt

src/main/java/utils/AESUtil.java:16–36

(byte[] K_e,byte[] plaintext)

public class AESUtil {
    public static final String InitVector = "EncDecInitVector";
    public static byte[] encrypt(byte[] K_e,byte[] plaintext){
        try{
            IvParameterSpec iv = new IvParameterSpec(InitVector.getBytes(StandardCharsets.UTF_8));
            SecretKeySpec secretKeySpec = new SecretKeySpec(K_e, "AES");
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
            cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec,iv);
            return cipher.doFinal(plaintext);
        } catch (InvalidAlgorithmParameterException e) {
            throw new RuntimeException(e);
        } catch (NoSuchPaddingException e) {
            throw new RuntimeException(e);
        } catch (IllegalBlockSizeException e) {
            throw new RuntimeException(e);
        } catch (NoSuchAlgorithmException e) {
            throw new RuntimeException(e);
        } catch (BadPaddingException e) {
            throw new RuntimeException(e);
        } catch (InvalidKeyException e) {
            throw new RuntimeException(e);
        }
    }

    public static byte[] decrypt(byte[] K_e,byte[] ciphertext) {
        IvParameterSpec iv = new IvParameterSpec(InitVector.getBytes(StandardCharsets.UTF_8));