From 01878ef00c621d8da4c27c61afa7093568c39290 Mon Sep 17 00:00:00 2001
From: Kyle Spearrin <kyle.spearrin@gmail.com>
Date: Thu, 18 Jan 2018 08:39:34 -0500
Subject: [PATCH] check that mac always exists if key has MacKey

---
 src/App/Utilities/Crypto.cs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/App/Utilities/Crypto.cs b/src/App/Utilities/Crypto.cs
index 46c6fdef8..36eb9f8b8 100644
--- a/src/App/Utilities/Crypto.cs
+++ b/src/App/Utilities/Crypto.cs
@@ -82,6 +82,11 @@ namespace Bit.App.Utilities
                 throw new ArgumentNullException(nameof(iv));
             }
 
+            if(key.MacKey != null && mac == null)
+            {
+                throw new ArgumentNullException(nameof(mac));
+            }
+
             if(key.EncryptionType != type)
             {
                 throw new InvalidOperationException(nameof(type));