Protect against permission denied error when accessing mouse coordina…

…tes.
huaiyongtai · Apr 13, 2016 · 9c37422 · 9c37422
1 parent 945ae29
commit 9c37422
Showing 1 changed file with 7 additions and 3 deletions.
diff --git a/lib/jsbn/rng.js b/lib/jsbn/rng.js
@@ -27,9 +27,13 @@ if(rng_pool == null) {
         window.detachEvent("onmousemove", onMouseMoveListener);
       return;
     }
-    this.count += 1;
-    var mouseCoordinates = ev.x + ev.y;
-    rng_pool[rng_pptr++] = mouseCoordinates & 255;
+    try {
+      var mouseCoordinates = ev.x + ev.y;
+      rng_pool[rng_pptr++] = mouseCoordinates & 255;
+      this.count += 1;
+    } catch (e) {
+      // Sometimes Firefox will deny permission to access event properties for some reason. Ignore.
+    }
   };
   if (window.addEventListener)
     window.addEventListener("mousemove", onMouseMoveListener, false);