public bool signCertificate(string DocumentPath, string CertificateSavePath, Stream privateKeyStream, string keyPassword, string SignatureIMGPath)
{
try
{
Pkcs12Store pk12 = new Pkcs12Store(privateKeyStream, keyPassword.ToCharArray());
privateKeyStream.Dispose();
//then Iterate throught certificate entries to find the private key entry
string alias = null;
foreach (string tAlias in pk12.Aliases)
{
if (pk12.IsKeyEntry(tAlias))
{
alias = tAlias;
break;
}
}
var pk = pk12.GetKey(alias).Key;
// reader and stamper
PdfReader reader = new PdfReader(DocumentPath);
int PageCount = reader.NumberOfPages;
using (FileStream fout = new FileStream(CertificateSavePath, FileMode.Create, FileAccess.ReadWrite))
{
using (PdfStamper stamper = PdfStamper.CreateSignature(reader, fout, '\0', null, true))
{
// appearance
PdfSignatureAppearance appearance = stamper.SignatureAppearance;
//appearance.Image = new iTextSharp.text.pdf.PdfImage();
//appearance.Reason = reason;
// appearance.Location = location;
appearance.SetVisibleSignature(new iTextSharp.text.Rectangle(163, 72, 297, 24), PageCount, "Icsi-Vendor");//.IsInvisible();//s
iTextSharp.text.Image watermark = iTextSharp.text.Image.GetInstance(SignatureIMGPath);
appearance.Image = watermark;
appearance.Image.ScaleToFit(70, 70);
//appearance.Image.Alignment=100;
appearance.Image.SetAbsolutePosition(100, 100);
appearance.GetAppearance().AddImage(watermark);
//digital signature
IExternalSignature es = new PrivateKeySignature(pk, "SHA-256");
MakeSignature.SignDetached(appearance, es, new Org.BouncyCastle.X509.X509Certificate[] { pk12.GetCertificate(alias).Certificate }, null, null, null, 0, CryptoStandard.CMS);
stamper.Close();
}
}
return(true);
}
catch (Exception Ex)
{
ErrorLog.LogError(Ex);
return(false);
}
}
