Added new test cases for PKCS#8 parsing (#12305)

docs/development/test-vectors.rst

@@ -189,6 +189,10 @@ Custom asymmetric vectors
   ``TEST(DSATest, NilpotentGenerator)``).
 * ``asymmetric/PKCS8/ec-invalid-private-scalar.pem`` - Contains a PKCS8 encoded
   PEM with a ``secp256r1`` OID and an invalid (very large) private scalar.
+* ``asymmetric/PKCS8/invalid-version.der`` - Contains a PKCS8 encoded DER with
+  an invalid version field.
+* ``asymmetric/PKCS8/unknown-oid.der`` - Contains a PKCS8 encoded DER with an
+  unknown OID.
 
 
 Key exchange

tests/hazmat/primitives/test_serialization.py

@@ -405,6 +405,25 @@ class TestDERSerialization:
         with pytest.raises(ValueError):
             load_der_parameters(param_data, backend)
 
+    @pytest.mark.xfail()
+    def test_load_pkcs8_private_key_invalid_version(self):
+        data = load_vectors_from_file(
+            os.path.join("asymmetric", "PKCS8", "invalid-version.der"),
+            lambda f: f.read(),
+            mode="rb",
+        )
+        with pytest.raises(ValueError):
+            load_der_private_key(data, password=None)
+
+    def test_load_pkcs8_private_key_unknown_oid(self):
+        data = load_vectors_from_file(
+            os.path.join("asymmetric", "PKCS8", "unknown-oid.der"),
+            lambda f: f.read(),
+            mode="rb",
+        )
+        with pytest.raises(ValueError):
+            load_der_private_key(data, password=None)
+
 
 class TestPEMSerialization:
     @pytest.mark.parametrize(