//Try uploading the image for decryption
public static IMAGE_UPLOAD_RESULT UploadImage(System.Web.UI.WebControls.FileUpload fileUpload, ref string _name)
{
IMAGE_UPLOAD_RESULT result = IMAGE_UPLOAD_RESULT.SUCCESS;
//Get the file name
string filename = Path.GetFileName(fileUpload.FileName);
//Generate a new random name (GUID) for the image
filename = Guid.NewGuid().ToString() + "_" + filename;
//Save the file in the proper path with the proper name
fileUpload.SaveAs(FolderPath + filename);
//Check is it's not an image
if (!isImage(FolderPath + filename))
{
result = IMAGE_UPLOAD_RESULT.FAILED;
}
else
{
//If it's an image
try
{
//Read the image data to check if it's valid
using (System.Drawing.Image myImage = System.Drawing.Image.FromStream(fileUpload.PostedFile.InputStream))
{
/* //If it's not a square
* if (myImage.Height != myImage.Width)
* {
* //Display error because image isn't square
* result = IMAGE_UPLOAD_RESULT.DIMNOTEQUAL;
* }*/
//Check if the image width is greater than the maximum width allowed (for memroy reasons)
if (myImage.Width > MAXWIDTH)
{
//Display error because image is too big
result = IMAGE_UPLOAD_RESULT.BIGFILE;
}
}
}
catch (Exception exp)
{
//Display error because uploading has failed
result = IMAGE_UPLOAD_RESULT.FAILED;
}
}
//If uploading was a success, set _name to the filename
if (result == IMAGE_UPLOAD_RESULT.SUCCESS)
{
_name = filename;
}
else
{
//If it wasn't successful, delete the uploaded file
DeleteFile(FolderPath + filename);
}
//Return the upload result
return(result);
}
protected void ValidateImage()
{
string fileName = "";
//Upload the image
IMAGE_UPLOAD_RESULT result = Helpers.UploadImage(FileUpload1, ref fileName);
//Handle upload errors by displaying a warning message
if (result == IMAGE_UPLOAD_RESULT.FAILED)
{
Helpers.WarningMessage(Panel2, "Error: The selected file is not a proper image file");
}
else if (result == IMAGE_UPLOAD_RESULT.BIGFILE)
{
Helpers.WarningMessage(Panel2, "Error: File size is too big.");
}
else if (result == IMAGE_UPLOAD_RESULT.DIMNOTEQUAL)
{
Helpers.WarningMessage(Panel2, "Error: Image dimensions aren't equal.");
}
else if (result == IMAGE_UPLOAD_RESULT.NOTBMP)
{
Helpers.WarningMessage(Panel2, "Error: Only BMP files are allowed.");
}
//If Upload was successful
else
{
//Try decrypting the message
string key = KeyBox.Text;
string path = Helpers.FolderPath + fileName;
string bin = Helpers.ReadBinaryFromImage(path);
string msg = Encryptor.FinalDecrypt(bin, key);
//Decryption failed
if (msg == null)
{
Helpers.WarningMessage(Panel2, "Error: Invalid file or key");
}
//Decryption succeeded
else
{
//Replace panel controls with the result
for (int i = Panel2.Controls.Count - 1; i >= 0; i--)
{
Control c = Panel2.Controls[i];
if (c != TextArea1)
{
Panel2.Controls.Remove(c);
c.Dispose();
}
}
TextArea1.Attributes.Remove("hidden");
TextArea1.InnerText = msg;
TextArea1.Style.Clear();
TextArea1.Style.Add(HtmlTextWriterStyle.Width, "100%");
TextArea1.Style.Add(HtmlTextWriterStyle.Height, "100%");
TextArea1.Style.Add(HtmlTextWriterStyle.Display, "Block");
}
}
}
