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omegapro/PowerTools/Classes/DigitalSignatureAccessor.cs

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+/***************************************************************************
+
+Copyright (c) Microsoft Corporation 2011.
+
+This code is licensed using the Microsoft Public License (Ms-PL).  The text of the license can be found here:
+
+http://www.microsoft.com/resources/sharedsource/licensingbasics/publiclicense.mspx
+
+***************************************************************************/
+
+using System;
+using System.Collections.Generic;
+using System.Security.Cryptography.X509Certificates;
+using System.Collections.ObjectModel;
+using System.IO.Packaging;
+
+namespace OpenXmlPowerTools
+{
+    public class DigitalSignatureAccessor
+    {
+        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();
+            }
+        }
+
+        /// <summary>
+        ///  Tests a Digital Signature from a package
+        /// </summary>
+        /// <returns>Digital signatures list</returns>
+        public static Collection<string> GetList(OpenXmlPowerToolsDocument doc)
+        {
+            using (OpenXmlMemoryStreamDocument streamDoc = new OpenXmlMemoryStreamDocument(doc))
+            {
+                // Creates the PackageDigitalSignatureManager
+                PackageDigitalSignatureManager digitalSignatureManager = new PackageDigitalSignatureManager(streamDoc.GetPackage());
+                // Verifies the collection of certificates in the package
+                Collection<string> digitalSignatureDescriptions = new Collection<string>();
+                ReadOnlyCollection<PackageDigitalSignature> digitalSignatures = digitalSignatureManager.Signatures;
+                if (digitalSignatures.Count > 0)
+                {
+                    foreach (PackageDigitalSignature signature in digitalSignatures)
+                    {
+                        if (PackageDigitalSignatureManager.VerifyCertificate(signature.Signer) != X509ChainStatusFlags.NoError)
+                        {
+                            digitalSignatureDescriptions.Add(string.Format(System.Globalization.CultureInfo.InvariantCulture, "Signature: {0} ({1})", signature.Signer.Subject, PackageDigitalSignatureManager.VerifyCertificate(signature.Signer)));
+                        }
+                        else
+                            digitalSignatureDescriptions.Add("Signature: " + signature.Signer.Subject);
+                    }
+                }
+                else
+                {
+                    digitalSignatureDescriptions.Add("No digital signatures found");
+                }
+                return digitalSignatureDescriptions;
+            }
+        }
+
+        /// <summary>
+        /// RemoveAll
+        /// </summary>
+        public static OpenXmlPowerToolsDocument RemoveAll(OpenXmlPowerToolsDocument doc)
+        {
+            using (OpenXmlMemoryStreamDocument streamDoc = new OpenXmlMemoryStreamDocument(doc))
+            {
+                using (Package package = streamDoc.GetPackage())
+                {
+                    // Creates the PackageDigitalSignatureManager
+                    PackageDigitalSignatureManager digitalSignatureManager = new PackageDigitalSignatureManager(package);
+                    digitalSignatureManager.RemoveAllSignatures();
+                }
+                return streamDoc.GetModifiedDocument();
+            }
+        }
+    }
+}