void OnButtonClicked(object sender, EventArgs e)
{
label2.Hidden = false;
StringBuilder builder = new StringBuilder();
Stream docStream = typeof(DigitalSignatureValidation).GetTypeInfo().Assembly.GetManifestResourceStream("SampleBrowser.Samples.PDF.Assets.SignedDocument.pdf");
//Load the PDF document into the loaded document object.
PdfLoadedDocument loadedDocument = new PdfLoadedDocument(docStream);
//Get signature field
PdfLoadedSignatureField lSigFld = loadedDocument.Form.Fields[0] as PdfLoadedSignatureField;
//X509Certificate2Collection to check the signer's identity using root certificates
X509CertificateCollection collection = new X509CertificateCollection();
//Get the certificate stream from .pfx file.
Stream certificateStream = typeof(DigitalSignatureValidation).GetTypeInfo().Assembly.GetManifestResourceStream("SampleBrowser.Samples.PDF.Assets.PDF.pfx");
byte[] data = new byte[certificateStream.Length];
certificateStream.Read(data, 0, data.Length);
//Create new X509Certificate2 with the root certificate
X509Certificate2 certificate = new X509Certificate2(data, "password123");
//Add the certificate to the collection
collection.Add(certificate);
//Validate signature and get the validation result
PdfSignatureValidationResult result = lSigFld.ValidateSignature(collection);
builder.AppendLine("Signature is " + result.SignatureStatus);
builder.AppendLine();
builder.AppendLine("--------Validation Summary--------");
builder.AppendLine();
//Checks whether the document is modified or not
bool isModified = result.IsDocumentModified;
if (isModified)
{
builder.AppendLine("The document has been altered or corrupted since the signature was applied.");
}
else
{
builder.AppendLine("The document has not been modified since the signature was applied.");
}
//Signature details
builder.AppendLine("Digitally signed by " + lSigFld.Signature.Certificate.IssuerName);
builder.AppendLine("Valid From : " + lSigFld.Signature.Certificate.ValidFrom);
builder.AppendLine("Valid To : " + lSigFld.Signature.Certificate.ValidTo);
builder.AppendLine("Signature Algorithm : " + result.SignatureAlgorithm);
builder.AppendLine("Hash Algorithm : " + result.DigestAlgorithm);
//Revocation validation details
builder.AppendLine("OCSP revocation status : " + result.RevocationResult.OcspRevocationStatus);
if (result.RevocationResult.OcspRevocationStatus == RevocationStatus.None && result.RevocationResult.IsRevokedCRL)
{
builder.AppendLine("CRL is revoked.");
}
//Close the PDF document
loadedDocument.Close(true);
label2.Text = builder.ToString();
}
public ActionResult DigitalSignatureValidation(string InsideBrowser)
{
SignatureValidationMesssage message = new SignatureValidationMesssage();
FileStream fileStreamInput = new FileStream(ResolveApplicationDataPath("DigitalSignature.pdf"), FileMode.Open, FileAccess.Read);
//Load an existing signed PDF document
PdfLoadedDocument ldoc = new PdfLoadedDocument(fileStreamInput);
//Get signature field.
PdfLoadedSignatureField lSigFld = ldoc.Form.Fields[0] as PdfLoadedSignatureField;
//X509Certificate2Collection to check the signer's identity using root certificates.
X509CertificateCollection collection = new X509CertificateCollection();
//Read the certificate file.
FileStream pfxFile = new FileStream(ResolveApplicationDataPath(@"PDF.pfx"), FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
byte[] data = new byte[pfxFile.Length];
pfxFile.Read(data, 0, data.Length);
//Create new X509Certificate2 with the root certificate.
X509Certificate2 certificate = new X509Certificate2(data, "password123");
//Add the certificate to the collection.
collection.Add(certificate);
//Validate signature and get the validation result
PdfSignatureValidationResult result = lSigFld.ValidateSignature(collection);
StringBuilder builder = new StringBuilder();
builder.AppendLine("Signature is " + result.SignatureStatus);
builder.AppendLine();
builder.AppendLine("--------Validation Summary--------");
builder.AppendLine();
//Checks whether the document is modified or not
bool isModified = result.IsDocumentModified;
if (isModified)
{
builder.AppendLine("The document has been altered or corrupted since the signature was applied.");
}
else
{
builder.AppendLine("The document has not been modified since the signature was applied.");
}
//Signature details
builder.AppendLine("Digitally signed by " + lSigFld.Signature.Certificate.IssuerName);
builder.AppendLine("Valid From : " + lSigFld.Signature.Certificate.ValidFrom);
builder.AppendLine("Valid To : " + lSigFld.Signature.Certificate.ValidTo);
builder.AppendLine("Signature Algorithm : " + result.SignatureAlgorithm);
builder.AppendLine("Hash Algorithm : " + result.DigestAlgorithm);
//Revocation validation details
builder.AppendLine("OCSP revocation status : " + result.RevocationResult.OcspRevocationStatus);
if (result.RevocationResult.OcspRevocationStatus == RevocationStatus.None && result.RevocationResult.IsRevokedCRL)
{
builder.AppendLine("CRL is revoked.");
}
//Close the document
ldoc.Close(true);
message.Message = builder.ToString();
return(View("DigitalSignatureValidation", message));
}
private void button3_Click(object sender, RoutedEventArgs e)
{
//Get the template PDF file stream from assembly.
Stream documentStream = typeof(DigitalSignature).GetTypeInfo().Assembly.GetManifestResourceStream("syncfusion.pdfdemos.winui.Assets.digital_signature_template.pdf");
//Load the PDF document from stream.
PdfLoadedDocument loadedDocument = new PdfLoadedDocument(documentStream);
//Get the .pfx certificate file stream.
Stream certificateStream = typeof(DigitalSignature).GetTypeInfo().Assembly.GetManifestResourceStream("syncfusion.pdfdemos.winui.Assets.certificate.pfx");
//Get the signature field to add digital signature.
PdfLoadedSignatureField signatureField = loadedDocument.Form.Fields[6] as PdfLoadedSignatureField;
//Get the signature bounds.
RectangleF bounds = signatureField.Bounds;
//Create PDF certificate using certificate stream and password.
PdfCertificate pdfCertificate = new PdfCertificate(certificateStream, "password123");
//Add certificate to first page of the document.
PdfSignature signature = new PdfSignature(loadedDocument, loadedDocument.Pages[0], pdfCertificate, "", signatureField);
signature.ContactInfo = "*****@*****.**";
signature.LocationInfo = "Honolulu, Hawaii";
signature.Reason = "I am author of this document.";
//Set the cryptographic standard to signature settings.
if ((bool)cms.IsChecked)
{
signature.Settings.CryptographicStandard = CryptographicStandard.CMS;
}
else
{
signature.Settings.CryptographicStandard = CryptographicStandard.CADES;
}
//Set the digest algorithm to signature settings.
if ((bool)sha1.IsChecked)
{
signature.Settings.DigestAlgorithm = DigestAlgorithm.SHA1;
}
else if ((bool)sha256.IsChecked)
{
signature.Settings.DigestAlgorithm = DigestAlgorithm.SHA256;
}
else if ((bool)sha384.IsChecked)
{
signature.Settings.DigestAlgorithm = DigestAlgorithm.SHA384;
}
else if ((bool)sha512.IsChecked)
{
signature.Settings.DigestAlgorithm = DigestAlgorithm.SHA512;
}
//Get the signature field appearance graphics.
PdfGraphics graphics = signature.Appearance.Normal.Graphics;
if (graphics != null)
{
//Draw the rectangle in appearance graphics.
graphics.DrawRectangle(PdfPens.Black, bounds);
//Get the image file stream from assembly.
Stream imageStream = typeof(DigitalSignature).GetTypeInfo().Assembly.GetManifestResourceStream("syncfusion.pdfdemos.winui.Assets.signature.png");
//Create the PDF bitmap image from stream.
PdfBitmap bitmap = new PdfBitmap(imageStream, true);
//Draw image to appearance graphics.
graphics.DrawImage(bitmap, new RectangleF(2, 1, 30, 30));
//Get certificate subject name.
string subject = pdfCertificate.SubjectName;
//Create a new font instance and draw a text to appearance graphics.
PdfFont font = new PdfStandardFont(PdfFontFamily.Helvetica, 7);
RectangleF textRect = new RectangleF(45, 0, bounds.Width - 45, bounds.Height);
PdfStringFormat format = new PdfStringFormat(PdfTextAlignment.Justify);
graphics.DrawString("Digitally signed by " + subject + " \r\nReason: Testing signature \r\nLocation: USA", font, PdfBrushes.Black, textRect, format);
}
//Set the digital signature to signing the field.
signatureField.Signature = signature;
//Creating the stream object.
using (MemoryStream stream = new MemoryStream())
{
//Save and close the document.
loadedDocument.Save(stream);
loadedDocument.Close();
stream.Position = 0;
//Save the output stream as a file using file picker.
PdfUtil.Save("DigitalSignature.pdf", stream);
}
}
