1043933: Added sample browser demo samples.

Author: sameerkhan001

Digital Signature/Add-a-digital-signature-to-an-existing-document/.NET/Add-a-digital-signature-to-an-existing-document/Data/signature.png

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+<Solution>
+  <Project Path="Digital-Signature-Validation/Digital-Signature-Validation.csproj" />
+</Solution>

Digital Signature/Digital-Signature-Validation/.NET/Digital-Signature-Validation.slnx

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <RootNamespace>Digital_Signature_Validation</RootNamespace>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Syncfusion.Pdf.Net.Core" Version="*" />
+  </ItemGroup>
+
+</Project>

Digital Signature/Digital-Signature-Validation/.NET/Digital-Signature-Validation/Data/Input.pdf

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+using Syncfusion.Pdf.Parsing;
+using Syncfusion.Pdf.Security;
+using System.Security.Cryptography.X509Certificates;
+using System.Text;
+
+string dataPath = Path.GetFullPath(@"Data/");
+
+// Load signed PDF document
+using PdfLoadedDocument ldoc = new PdfLoadedDocument(Path.GetFullPath(@"Data/Input.pdf"));
+
+// Get signature field
+PdfLoadedSignatureField lSigFld = ldoc.Form.Fields[0] as PdfLoadedSignatureField;
+
+// Root and Intermediate Certificates
+X509CertificateCollection collection = new X509CertificateCollection();
+
+string[] certificates =
+{
+    "Root.cer",
+    "Intermediate0.cer",
+    "Intermediate1.cer"
+};
+
+foreach (string certFile in certificates)
+{
+    byte[] certData = File.ReadAllBytes(Path.Combine(dataPath, certFile));
+
+    X509Certificate2 certificate = new X509Certificate2(certData);
+
+    collection.Add(certificate);
+}
+
+// Validate signature
+PdfSignatureValidationResult result = lSigFld.ValidateSignature(collection);
+
+StringBuilder builder = new StringBuilder();
+
+builder.AppendLine("Signature is " + result.SignatureStatus);
+builder.AppendLine();
+builder.AppendLine("----------Validation Summary----------");
+builder.AppendLine();
+
+// Modified check
+if (result.IsDocumentModified)
+{
+    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.");
+}
+
+// Certificate 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 details
+builder.AppendLine("OCSP Revocation Status: " + result.RevocationResult.OcspRevocationStatus);
+
+if (result.RevocationResult.OcspRevocationStatus == RevocationStatus.None && result.RevocationResult.IsRevokedCRL)
+{
+    builder.AppendLine("CRL is revoked.");
+}
+
+builder.AppendLine();
+builder.AppendLine("--------Revocation Information---------");
+builder.AppendLine();
+
+foreach (PdfSignerCertificate signerCertificate in result.SignerCertificates)
+{
+    if (signerCertificate.OcspCertificate != null)
+    {
+        builder.AppendLine("------------OCSP Certificate-------------");
+
+        foreach (X509Certificate2 item in signerCertificate.OcspCertificate.Certificates)
+        {
+            builder.AppendLine("The OCSP Response was signed by: " + item.SubjectName.Name);
+        }
+
+        builder.AppendLine("Is Embedded: " + signerCertificate.OcspCertificate.IsEmbedded);
+
+        builder.AppendLine("Valid From: " + signerCertificate.OcspCertificate.ValidFrom);
+
+        builder.AppendLine("Valid To: " + signerCertificate.OcspCertificate.ValidTo);
+
+        builder.AppendLine();
+    }
+
+    if (signerCertificate.CrlCertificate != null)
+    {
+        builder.AppendLine("------------CRL Certificate--------------");
+
+        foreach (X509Certificate2 item in signerCertificate.CrlCertificate.Certificates)
+        {
+            builder.AppendLine("The CRL was signed by: " + item.SubjectName.Name);
+        }
+
+        builder.AppendLine("Is Embedded: " + signerCertificate.CrlCertificate.IsEmbedded);
+        builder.AppendLine("Valid From: " + signerCertificate.CrlCertificate.ValidFrom);
+        builder.AppendLine("Valid To: " + signerCertificate.CrlCertificate.ValidTo);
+        builder.AppendLine();
+    }
+}
+//Save to file
+File.WriteAllText(Path.GetFullPath(@"Output/Output.txt"),builder.ToString());