如何在下载过程中解密AWS S3文件？

Here is my download code :

这是我的下载代码：

 IAmazonS3 client;

            string key = tenant_id + @"/files/" + filename;
            try
            {
                using (client = new AmazonS3Client(Amazon.RegionEndpoint.USEast1))
                {
                    GetObjectRequest request = new GetObjectRequest
                    {
                        BucketName = existingBucketName,
                        Key = key
                    };

                    using (GetObjectResponse response = client.GetObject(request))
                    {
                        string dest = path;
                        if (!File.Exists(dest))
                        {
                            response.WriteResponseStreamToFile(dest);
                        }
                    }
                }
                return true;
            }
 IAmaz