1 files changed, 57 insertions, 0 deletions
diff --git a/src/mscorlib/src/System/Runtime/CompilerServices/InternalsVisibleToAttribute.cs b/src/mscorlib/src/System/Runtime/CompilerServices/InternalsVisibleToAttribute.cs
new file mode 100644
index 0000000000..fcb888d6d3
--- /dev/null
+++ b/src/mscorlib/src/System/Runtime/CompilerServices/InternalsVisibleToAttribute.cs
@@ -0,0 +1,57 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+//------------------------------------------------------------------------------
+//------------------------------------------------------------------------------
+
+namespace System.Runtime.CompilerServices
+{
+    using System;
+
+
+    [AttributeUsage(AttributeTargets.Assembly, AllowMultiple=true, Inherited=false)]
+    public sealed class InternalsVisibleToAttribute : Attribute
+    {
+        private string _assemblyName;
+        private bool _allInternalsVisible = true;
+
+        public InternalsVisibleToAttribute(string assemblyName)
+        {
+            this._assemblyName = assemblyName;
+        }
+
+        public string AssemblyName 
+        {
+            get 
+            {
+                return _assemblyName;
+            }
+        }
+
+        public bool AllInternalsVisible
+        {
+            get { return _allInternalsVisible; }
+            set { _allInternalsVisible = value; }
+        }
+    }
+
+    /// <summary>
+    ///     If AllInternalsVisible is not true for a friend assembly, the FriendAccessAllowed attribute
+    ///     indicates which internals are shared with that friend assembly.
+    /// </summary>
+    [AttributeUsage(AttributeTargets.Class |
+                    AttributeTargets.Constructor |
+                    AttributeTargets.Enum |
+                    AttributeTargets.Event |
+                    AttributeTargets.Field |
+                    AttributeTargets.Interface |
+                    AttributeTargets.Method |
+                    AttributeTargets.Property |
+                    AttributeTargets.Struct,
+        AllowMultiple = false,
+        Inherited = false)]
+    [FriendAccessAllowed]
+    internal sealed class FriendAccessAllowedAttribute : Attribute {
+    }
+}
+