add aes-gcm transforms

Signed-off-by: oleg.hoefling <[email protected]>

Author: hoefling

src/constants.c

@@ -543,6 +543,12 @@ int PyXmlSec_ConstantsModule_Init(PyObject* package) {
     PYXMLSEC_ADD_TRANSFORM_CONSTANT(TransformSha384, "SHA384");
     PYXMLSEC_ADD_TRANSFORM_CONSTANT(TransformSha512, "SHA512");
 
+#if XMLSEC_VERSION_HEX > 315
+    PYXMLSEC_ADD_TRANSFORM_CONSTANT(TransformAes128Gcm, "AES128_GCM");
+    PYXMLSEC_ADD_TRANSFORM_CONSTANT(TransformAes192Gcm, "AES192_GCM");
+    PYXMLSEC_ADD_TRANSFORM_CONSTANT(TransformAes256Gcm, "AES256_GCM");
+#endif
+
     PYXMLSEC_CLOSE_NAMESPACE(transformCls);
 
 #undef PYXMLSEC_ADD_TRANSFORM_CONSTANT