AES CBC方式，PKCS7填充加密解密，和其他语言试过，可以共用

        ///

        /// AES加密算法
        ///

        /// 明文字符串
        /// 将加密后的密文转换为Base64编码，以便显示
        public static byte[] AESEncrypt(string plainText, byte[] _key1)
        {
            //分组加密算法
            SymmetricAlgorithm des = Rijndael.Create();
            des.Padding = PaddingMode.PKCS7;
            des.Mode = CipherMode.CBC;
            byte[] inputByteArray = Encoding.UTF8.GetBytes(plainText);//得到需要加密的字节数组
            des.KeySize = 128;
            des.BlockSize = 128;
            //设置密钥及密钥向量
            des.Key = _key1;
            des.IV = _key1;
            byte[] cipherBytes = null;
            using (MemoryStream ms = new MemoryStream())
            {
                using (CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write))
                {
                    cs.Write(inputByteArray, 0, inputByteArray.Length);
                    cs.FlushFinalBlock();
                    cipherBytes = ms.ToArray();//得到加密后的字节数组
                    cs.Close();
                    ms.Close();
                }
            }
            return cipherBytes;
        }


        ///

        /// AES解密
        ///

        /// 密文字符串
        /// 明文
        public static string AESDecrypt(byte[] encryptStr, byte[] _key1)
        {
            byte[] bKey = _key1;// Encoding.UTF8.GetBytes(Key);
            byte[] bIV = _key1;// Encoding.UTF8.GetBytes(IV);
            byte[] byteArray = encryptStr;//Convert.FromBase64String(encryptStr);

            string decrypt = null;
            Rijndael aes = Rijndael.Create();
            aes.KeySize = 128;
            aes.BlockSize = 128;
            aes.Padding = PaddingMode.PKCS7;
            aes.Mode = CipherMode.CBC;
            try
            {
                using (MemoryStream mStream = new MemoryStream())
                {
                    using (CryptoStream cStream = new CryptoStream(mStream, aes.CreateDecryptor(bKey, bIV), CryptoStreamMode.Write))
                    {
                        cStream.Write(byteArray, 0, byteArray.Length);
                        cStream.FlushFinalBlock();
                        decrypt = Encoding.UTF8.GetString(mStream.ToArray());
                    }
                }
            }
            catch { }
            aes.Clear();

            return decrypt;
        }