Himall商城安装帮助类AES加密解密（2）

  ///

        /// AES解密
        ///

        /// 解密字符串
        /// 密钥
        ///
        public static string AESDecrypt(string decryptStr, string decryptKey)
        {
            if (string.IsNullOrWhiteSpace(decryptStr))
                return string.Empty;

            decryptKey = StringHelper.SubString(decryptKey, 32);
            decryptKey = decryptKey.PadRight(32, ' ');

            byte[] cipherText = Convert.FromBase64String(decryptStr);

            SymmetricAlgorithm des = Rijndael.Create();
            des.Key = Encoding.UTF8.GetBytes(decryptKey);
            des.IV = _aeskeys;
            byte[] decryptBytes = new byte[cipherText.Length];