//// This code is part of Document Solutions for PDF .NET demos.// Copyright (c) MESCIUS inc. All rights reserved.//using System.IO;
using GrapeCity.Documents.Pdf;using GrapeCity.Documents.Pdf.Security;

namespace DsPdfWeb.Demos{    // This sample shows how to sign a PDF with a .p12 file    // containing a digital certificate that uses PKCS#12    // (Public Key Cryptography Standard #12) encryption.    public class SignWithP12    {        public int CreatePDF(Stream stream)        {            var doc = new GcPdfDocument();            using var s = File.OpenRead(Path.Combine("Resources", "PDFs", "SignWithP12.pdf"));            doc.Load(s);
            var p12 = Path.Combine("Resources", "Misc", "DsPdfTest2KeyStore.p12");            var sp = new SignatureProperties()            {                SignatureBuilder = new Pkcs7SignatureBuilder()                {                    CertificateChain = SecurityUtils.GetCertificateChain(p12, "qq"),                },                SignatureField = doc.AcroForm.Fields[0],            };            sp.SignatureAppearance.Caption = "PKCS #12";            doc.Sign(sp, stream);
            // Done.            return doc.Pages.Count;        }    }}