public static OpenXmlPowerToolsDocument Insert(OpenXmlPowerToolsDocument doc, IEnumerable<string> certificateList)
{
using (OpenXmlMemoryStreamDocument streamDoc = new OpenXmlMemoryStreamDocument(doc))
{
using (Package package = streamDoc.GetPackage())
{
foreach (string digitalCertificate in certificateList)
{
X509Certificate x509Certificate = X509Certificate2.CreateFromCertFile(digitalCertificate);
PackageDigitalSignatureManager digitalSigntaureManager = new PackageDigitalSignatureManager(package);
digitalSigntaureManager.CertificateOption = CertificateEmbeddingOption.InSignaturePart;
System.Collections.Generic.List<Uri> partsToSign = new System.Collections.Generic.List<Uri>();
//Adds each part to the list, except relationships parts.
foreach (PackagePart openPackagePart in package.GetParts())
{
if (!PackUriHelper.IsRelationshipPartUri(openPackagePart.Uri))
partsToSign.Add(openPackagePart.Uri);
}
List<PackageRelationshipSelector> relationshipSelectors = new List<PackageRelationshipSelector>();
//Creates one selector for each package-level relationship, based on id
foreach (PackageRelationship relationship in package.GetRelationships())
{
PackageRelationshipSelector relationshipSelector =
new PackageRelationshipSelector(relationship.SourceUri, PackageRelationshipSelectorType.Id, relationship.Id);
relationshipSelectors.Add(relationshipSelector);
}
digitalSigntaureManager.Sign(partsToSign, x509Certificate, relationshipSelectors);
}
}
return streamDoc.GetModifiedDocument();
}
}
private static void AddSignableItems(PackageRelationship relationship, ICollection<Uri> partsToSign, ICollection<PackageRelationshipSelector> relationshipsToSign)
{
var selector = new PackageRelationshipSelector(relationship.SourceUri, PackageRelationshipSelectorType.Id, relationship.Id);
relationshipsToSign.Add(selector);
if (relationship.TargetMode != TargetMode.Internal)
{
return;
}
var part = relationship.Package.GetPart(
PackUriHelper.ResolvePartUri(
relationship.SourceUri, relationship.TargetUri));
if (partsToSign.Contains(part.Uri))
{
return;
}
partsToSign.Add(part.Uri);
foreach (var childRelationship in part.GetRelationships())
{
AddSignableItems(childRelationship, partsToSign, relationshipsToSign);
}
}
