private void Button_Click_1(object sender, RoutedEventArgs e)
{
//Get the template PDF file stream from assembly.
Stream documentStream = typeof(Encryption).GetTypeInfo().Assembly.GetManifestResourceStream("syncfusion.pdfdemos.winui.Assets.credit_card_statement.pdf");
//Load the PDF document from stream.
PdfLoadedDocument document = new PdfLoadedDocument(documentStream);
//Get the document security.
PdfSecurity security = document.Security;
//Specify key size and encryption algorithm.
if (encryptionTechnique.SelectionBoxItem.ToString() == "40-Bit RC4")
{
//use 40 bits key in RC4 mode.
security.KeySize = PdfEncryptionKeySize.Key40Bit;
security.Algorithm = PdfEncryptionAlgorithm.RC4;
}
else if (encryptionTechnique.SelectionBoxItem.ToString() == "128-Bit RC4")
{
//use 128 bits key in RC4 mode.
security.KeySize = PdfEncryptionKeySize.Key128Bit;
security.Algorithm = PdfEncryptionAlgorithm.RC4;
}
else if (encryptionTechnique.SelectionBoxItem.ToString() == "128-Bit AES")
{
//use 128 bits key in RC4 mode.
security.KeySize = PdfEncryptionKeySize.Key128Bit;
security.Algorithm = PdfEncryptionAlgorithm.AES;
}
else if (encryptionTechnique.SelectionBoxItem.ToString() == "256-Bit AES")
{
//use 256 bits key in AES mode.
security.KeySize = PdfEncryptionKeySize.Key256Bit;
security.Algorithm = PdfEncryptionAlgorithm.AES;
}
else if (encryptionTechnique.SelectionBoxItem.ToString() == "256-Bit AES Revision 6")
{
//use 256 bits key in AES mode with Revision 6.
security.KeySize = PdfEncryptionKeySize.Key256BitRevision6;
security.Algorithm = PdfEncryptionAlgorithm.AES;
}
//Set the PdfEncryption option to encrypt the document.
if (!cmbencryptOption.IsEnabled || cmbencryptOption.SelectedIndex == 0)
{
security.EncryptionOptions = PdfEncryptionOptions.EncryptAllContents;
}
else if (cmbencryptOption.SelectedIndex == 1)
{
security.EncryptionOptions = PdfEncryptionOptions.EncryptAllContentsExceptMetadata;
}
else if (cmbencryptOption.SelectedIndex == 2)
{
//Read a file from assembly to add an attachment.
Stream imageStream = typeof(Encryption).GetTypeInfo().Assembly.GetManifestResourceStream("syncfusion.pdfdemos.winui.Assets.credit_card_statement.xml");
//Create PdfAttachment from stream.
PdfAttachment attachment = new PdfAttachment("PDF.xml", imageStream);
attachment.ModificationDate = DateTime.Now;
attachment.Description = "Product details";
attachment.MimeType = "application/xml";
if (document.Attachments == null)
{
document.CreateAttachment();
}
//Adds the attachment to the document.
document.Attachments.Add(attachment);
security.EncryptionOptions = PdfEncryptionOptions.EncryptOnlyAttachments;
}
//Set the user and owner password.
security.OwnerPassword = txtOwnerPassword.Text;
security.UserPassword = txtUserPassword.Text;
//Set the permission flags for the file.
security.Permissions = PdfPermissionsFlags.Print | PdfPermissionsFlags.FullQualityPrint;
//Creating the stream object.
using (MemoryStream stream = new MemoryStream())
{
//Save and close the document.
document.Save(stream);
document.Close(true);
stream.Position = 0;
//Save the output stream as a file using file picker.
PdfUtil.Save("Encryption.pdf", stream);
}
}