compare authors using Thumbprint

Reviewed-on: https://gerrit.libreoffice.org/c/core/+/130929
Tested-by: Jenkins
Reviewed-by: Miklos Vajna <vmiklos@collabora.com>
(cherry picked from commit 6544220)
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/130866
Reviewed-by: Michael Stahl <michael.stahl@allotropia.de>
(cherry picked from commit a7aaa78)

Change-Id: I338f58eb07cbf0a3d13a7dafdaddac09252a8546
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/131368
Tested-by: Michael Stahl <michael.stahl@allotropia.de>
Reviewed-by: Michael Stahl <michael.stahl@allotropia.de>

xmlsecurity/source/component/documentdigitalsignatures.cxx

@@ -636,9 +636,18 @@ sal_Bool DocumentDigitalSignatures::isAuthorTrusted(
     Sequence< SvtSecurityOptions::Certificate > aTrustedAuthors = SvtSecurityOptions().GetTrustedAuthors();
 
     return std::any_of(aTrustedAuthors.begin(), aTrustedAuthors.end(),
-        [&xAuthor, &sSerialNum](const SvtSecurityOptions::Certificate& rAuthor) {
-            return xmlsecurity::EqualDistinguishedNames(rAuthor[0], xAuthor->getIssuerName(), xmlsecurity::NOCOMPAT)
-                && ( rAuthor[1] == sSerialNum );
+        [this, &xAuthor, &sSerialNum](const SvtSecurityOptions::Certificate& rAuthor) {
+            if (!xmlsecurity::EqualDistinguishedNames(rAuthor[0], xAuthor->getIssuerName(), xmlsecurity::NOCOMPAT))
+                return false;
+            if (rAuthor[1] != sSerialNum)
+                return false;
+
+            DocumentSignatureManager aSignatureManager(mxCtx, {});
+            if (!aSignatureManager.init())
+                return false;
+            uno::Reference<css::security::XCertificate> xCert =
+                aSignatureManager.getSecurityEnvironment()->createCertificateFromAscii(rAuthor[2]);
+            return xCert->getSHA1Thumbprint() == xAuthor->getSHA1Thumbprint();
         });
 }