xmlsecurity nss: fix OOXML signing with ECDSA key

Reviewed-on: https://gerrit.libreoffice.org/54779
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
(cherry picked from commit 6b1b8ef51b752f9711d6581283d6c515d3c50d9b)

Change-Id: Id2b59887fcd69e294a6d9db17ec0446615054ecc

3 files changed, 57 insertions, 3 deletions

diff --git a/xmlsecurity/qa/unit/signing/signing.cxx b/xmlsecurity/qa/unit/signing/signing.cxx
index 0cf7ed8cd637..6b71bb5b7990 100644
--- a/xmlsecurity/qa/unit/signing/signing.cxx
+++ b/xmlsecurity/qa/unit/signing/signing.cxx
@@ -73,6 +73,7 @@ public:
 
     void testDescription();
     void testECDSA();
+    void testECDSAOOXML();
     /// Test a typical ODF where all streams are signed.
     void testODFGood();
     /// Test a typical broken ODF signature where one stream is corrupted.
@@ -131,6 +132,7 @@ public:
     CPPUNIT_TEST_SUITE(SigningTest);
     CPPUNIT_TEST(testDescription);
     CPPUNIT_TEST(testECDSA);
+    CPPUNIT_TEST(testECDSAOOXML);
     CPPUNIT_TEST(testODFGood);
     CPPUNIT_TEST(testODFBroken);
     CPPUNIT_TEST(testODFNo);
@@ -372,6 +374,47 @@ void SigningTest::testECDSA()
     CPPUNIT_ASSERT_EQUAL(css::xml::crypto::SecurityOperationStatus_OPERATION_SUCCEEDED, rInformations[0].nStatus);
 }
 
+void SigningTest::testECDSAOOXML()
+{
+    // Create an empty document and store it to a tempfile, finally load it as a storage.
+    createDoc("");
+
+    utl::TempFile aTempFile;
+    aTempFile.EnableKillingFile();
+    uno::Reference<frame::XStorable> xStorable(mxComponent, uno::UNO_QUERY);
+    utl::MediaDescriptor aMediaDescriptor;
+    aMediaDescriptor["FilterName"] <<= OUString("MS Word 2007 XML");
+    xStorable->storeAsURL(aTempFile.GetURL(), aMediaDescriptor.getAsConstPropertyValueList());
+
+    DocumentSignatureManager aManager(mxComponentContext, DocumentSignatureMode::Content);
+    CPPUNIT_ASSERT(aManager.init());
+    uno::Reference<embed::XStorage> xStorage
+        = comphelper::OStorageHelper::GetStorageOfFormatFromURL(
+            ZIP_STORAGE_FORMAT_STRING, aTempFile.GetURL(), embed::ElementModes::READWRITE);
+    CPPUNIT_ASSERT(xStorage.is());
+    aManager.mxStore = xStorage;
+    aManager.maSignatureHelper.SetStorage(xStorage, "1.2");
+
+    // Then add a document signature.
+    uno::Reference<security::XCertificate> xCertificate
+        = getCertificate(aManager, svl::crypto::SignatureMethodAlgorithm::ECDSA);
+    if (!xCertificate.is())
+        return;
+    OUString aDescription;
+    sal_Int32 nSecurityId;
+    aManager.add(xCertificate, mxSecurityContext, aDescription, nSecurityId,
+                 /*bAdESCompliant=*/false);
+
+    // Read back the signature and make sure that it's valid.
+    aManager.read(/*bUseTempStream=*/true);
+    std::vector<SignatureInformation>& rInformations = aManager.maCurrentSignatureInformations;
+    CPPUNIT_ASSERT_EQUAL(static_cast<std::size_t>(1), rInformations.size());
+    // This was SecurityOperationStatus_UNKNOWN, signing with an ECDSA key was
+    // broken.
+    CPPUNIT_ASSERT_EQUAL(css::xml::crypto::SecurityOperationStatus_OPERATION_SUCCEEDED,
+                         rInformations[0].nStatus);
+}
+
 void SigningTest::testOOXMLDescription()
 {
     // Create an empty document and store it to a tempfile, finally load it as a storage.
diff --git a/xmlsecurity/source/helper/ooxmlsecexporter.cxx b/xmlsecurity/source/helper/ooxmlsecexporter.cxx
index 942a3c0a4618..e27d0f5a06f8 100644
--- a/xmlsecurity/source/helper/ooxmlsecexporter.cxx
+++ b/xmlsecurity/source/helper/ooxmlsecexporter.cxx
@@ -130,9 +130,13 @@ void OOXMLSecExporter::Impl::writeCanonicalizationTransform()
 void OOXMLSecExporter::Impl::writeSignatureMethod()
 {
     rtl::Reference<SvXMLAttributeList> pAttributeList(new SvXMLAttributeList());
-    pAttributeList->AddAttribute("Algorithm", ALGO_RSASHA256);
-    m_xDocumentHandler->startElement(
-        "SignatureMethod", uno::Reference<xml::sax::XAttributeList>(pAttributeList.get()));
+
+    if (m_rInformation.eAlgorithmID == svl::crypto::SignatureMethodAlgorithm::ECDSA)
+        pAttributeList->AddAttribute("Algorithm", ALGO_ECDSASHA256);
+    else
+        pAttributeList->AddAttribute("Algorithm", ALGO_RSASHA256);
+
+    m_xDocumentHandler->startElement("SignatureMethod", uno::Reference<xml::sax::XAttributeList>(pAttributeList.get()));
     m_xDocumentHandler->endElement("SignatureMethod");
 }
 
diff --git a/xmlsecurity/source/helper/ooxmlsecparser.cxx b/xmlsecurity/source/helper/ooxmlsecparser.cxx
index e329b8d35176..3a9b04fe3691 100644
--- a/xmlsecurity/source/helper/ooxmlsecparser.cxx
+++ b/xmlsecurity/source/helper/ooxmlsecparser.cxx
@@ -60,6 +60,13 @@ void SAL_CALL OOXMLSecParser::startElement(const OUString& rName, const uno::Ref
         if (!aId.isEmpty())
             m_pXSecController->setId(aId);
     }
+    else if (rName == "SignatureMethod")
+    {
+        OUString ouAlgorithm = xAttribs->getValueByName("Algorithm");
+        if (ouAlgorithm == ALGO_ECDSASHA1 || ouAlgorithm == ALGO_ECDSASHA256
+            || ouAlgorithm == ALGO_ECDSASHA512)
+            m_pXSecController->setSignatureMethod(svl::crypto::SignatureMethodAlgorithm::ECDSA);
+    }
     else if (rName == "Reference")
     {
         OUString aURI = xAttribs->getValueByName("URI");