Method decrypt

src/main/java/utils/AESUtil.java:38–50

(byte[] K_e,byte[] ciphertext)

    }

    public static byte[] decrypt(byte[] K_e,byte[] ciphertext) {
        IvParameterSpec iv = new IvParameterSpec(InitVector.getBytes(StandardCharsets.UTF_8));
        try {
            SecretKeySpec secretKeySpec = new SecretKeySpec(K_e, "AES");
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
            cipher.init(Cipher.DECRYPT_MODE, secretKeySpec,iv);
            byte[] res = cipher.doFinal(ciphertext);
            return res;
        } catch (Exception e){

        }
        return null;
    }
}