C# Decrypting AES/ECB Paddded Using PKCS#5

问题

I'm making a small application for fun in C# which retrieves a image from a server which is encrypted using AES/ECB with a single synchronous key (which I know) and padded using PKCS#5.

I tried just downloading the image by using a BinaryReader, however when I go to open the image, it is a corrupt file. I assume this is because it is encrypted. Here is my code:

string repsonseData = string.Empty;
using (var response = (HttpWebResponse)req.GetResponse()){
   using (var reader = new BinaryReader(response.GetResponseStream())) {
     Byte[] lnByte = reader.ReadBytes(1 * 1024 * 1024 * 10);
      using (FileStream lxFS = new FileStream("imageName.jpg", FileMode.Create)) {
         lxFS.Write(lnByte, 0, lnByte.Length);
      }
   }
}

Any help would be appreciated. Thanks!

来源：https://stackoverflow.com/questions/21022086/c-sharp-decrypting-aes-ecb-paddded-using-pkcs5