Related tdf#118581 Use subject name, not issuer name for signature line

And map the gpg user also the the subject name

Change-Id: I1db7b93b6bfc82304924d6ef90db18ff4f97e13c
Reviewed-on: https://gerrit.libreoffice.org/63278
Tested-by: Jenkins
Reviewed-by: Samuel Mehrbrodt <Samuel.Mehrbrodt@cib.de>

cui/source/dialogs/SignSignatureLineDialog.cxx

@@ -141,7 +141,7 @@ IMPL_LINK_NOARG(SignSignatureLineDialog, chooseCertificate, weld::Button&, void)
     {
         m_xSelectedCertifate = xSignCertificate;
         m_xBtnChooseCertificate->set_label(
-            xmlsec::GetContentPart(xSignCertificate->getIssuerName()));
+            xmlsec::GetContentPart(xSignCertificate->getSubjectName()));
     }
     ValidateFields();
 }
@@ -180,7 +180,7 @@ SignSignatureLineDialog::getSignedGraphic(bool bValid)
     aSvgImage = aSvgImage.replaceAll("[SIGNATURE]", getCDataString(m_xEditName->get_text()));
     OUString aIssuerLine
         = CuiResId(RID_SVXSTR_SIGNATURELINE_SIGNED_BY)
-              .replaceFirst("%1", xmlsec::GetContentPart(m_xSelectedCertifate->getIssuerName()));
+              .replaceFirst("%1", xmlsec::GetContentPart(m_xSelectedCertifate->getSubjectName()));
     aSvgImage = aSvgImage.replaceAll("[SIGNED_BY]", getCDataString(aIssuerLine));
     if (bValid)
         aSvgImage = aSvgImage.replaceAll("[INVALID_SIGNATURE]", "");

xmlsecurity/source/gpg/CertificateImpl.cxx

@@ -61,8 +61,8 @@ OUString SAL_CALL CertificateImpl::getIssuerName()
 
 OUString SAL_CALL CertificateImpl::getSubjectName()
 {
-    // Empty for gpg
-    return OUString();
+    // Samue as issuer name (user ID)
+    return getIssuerName();
 }
 
 namespace {