Java DES 加解密（"DES/CBC/PKCS5Padding"）

    /**
     * DES加密
     *
     * @param data 加密資料
     * @param key  金鑰
     * @return 返回加密後的資料
     */
    public static byte[] desEncrypt(byte[] data, String key, String charset) {
        try {
            Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
            byte[] k = charset == null || charset.trim().isEmpty() ? key.getBytes() : key.getBytes(charset);
            SecretKey secretKey = SecretKeyFactory.getInstance("DES").generateSecret(new DESKeySpec(k));
            cipher.init(Cipher.ENCRYPT_MODE, secretKey, new IvParameterSpec(k));
            return cipher.doFinal(data);
        } catch (Exception e) {
            return null;
        }
    }

    /**
     * DES解密
     *
     * @param data 解密資料
     * @param key  金鑰
     * @return 返回解密後的資料
     */
    public static String desDecrypt(byte[] data, String key, String charset) {
        try {
            Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
            byte[] k = charset == null || charset.trim().isEmpty() ? key.getBytes() : key.getBytes(charset);
            cipher.init(Cipher.DECRYPT_MODE, SecretKeyFactory.getInstance("DES").generateSecret(new DESKeySpec(k)), new IvParameterSpec(k));
            if (charset == null || charset.trim().isEmpty()) {
                return new String(cipher.doFinal(data));
            }
            return new String(cipher.doFinal(data), charset);
        } catch (Exception e) {
            return null;
        }
    }