1 files changed, 36 insertions, 0 deletions
diff --git a/src/mscorlib/shared/System/Security/SecurityCriticalAttribute.cs b/src/mscorlib/shared/System/Security/SecurityCriticalAttribute.cs
new file mode 100644
index 0000000000..2bf1700afb
--- /dev/null
+++ b/src/mscorlib/shared/System/Security/SecurityCriticalAttribute.cs
@@ -0,0 +1,36 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+namespace System.Security
+{
+    // SecurityCriticalAttribute
+    //  Indicates that the decorated code or assembly performs security critical operations (e.g. Assert, "unsafe", LinkDemand, etc.)
+    //  The attribute can be placed on most targets, except on arguments/return values.
+    [AttributeUsage(AttributeTargets.Assembly |
+                    AttributeTargets.Class |
+                    AttributeTargets.Struct |
+                    AttributeTargets.Enum |
+                    AttributeTargets.Constructor |
+                    AttributeTargets.Method |
+                    AttributeTargets.Field |
+                    AttributeTargets.Interface |
+                    AttributeTargets.Delegate,
+        AllowMultiple = false,
+        Inherited = false)]
+    public sealed class SecurityCriticalAttribute : Attribute
+    {
+#pragma warning disable 618    // We still use SecurityCriticalScope for v2 compat
+        public SecurityCriticalAttribute() { }
+
+        public SecurityCriticalAttribute(SecurityCriticalScope scope)
+        {
+            Scope = scope;
+        }
+
+        [Obsolete("SecurityCriticalScope is only used for .NET 2.0 transparency compatibility.")]
+        public SecurityCriticalScope Scope { get; }
+#pragma warning restore 618
+    }
+}
+