Imported Upstream version 4.0.0~alpha1

Former-commit-id: 806294f5ded97629b74c85c09952f2a74fe182d9

external/referencesource/System.Web/Configuration/StrongNameUtility.cs

@@ -0,0 +1,66 @@
+//------------------------------------------------------------------------------
+// <copyright file="StrongNameUtility.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//------------------------------------------------------------------------------
+
+namespace System.Web.Configuration {
+
+    using System.Diagnostics;
+    using System.IO;
+    using System.Runtime.InteropServices;
+    using System.Security.Permissions;
+    using Microsoft.Runtime.Hosting;
+
+    internal class StrongNameUtility {
+
+        // Help class shouldn't be instantiated.
+        private StrongNameUtility() {
+        }
+        
+        internal static bool GenerateStrongNameFile(string filename) {
+            // variables that hold the unmanaged key
+            IntPtr keyBlob = IntPtr.Zero;
+            int generatedSize = 0;
+
+            // create the key
+            bool createdKey = StrongNameHelpers.StrongNameKeyGen(null,
+                0 /*No flags. 1 is to save the key in the key container */, 
+                out keyBlob, out generatedSize);
+
+            // if there was a problem, translate it and report it
+            if (!createdKey || keyBlob == IntPtr.Zero) {
+                throw Marshal.GetExceptionForHR(StrongNameHelpers.StrongNameErrorInfo());
+            }
+
+            try {
+                Debug.Assert(keyBlob != IntPtr.Zero);
+
+                // make sure the key size makes sense
+                Debug.Assert(generatedSize > 0 && generatedSize <= Int32.MaxValue);
+                if (generatedSize <= 0 || generatedSize > Int32.MaxValue) {
+                    throw new InvalidOperationException(SR.GetString(SR.Browser_InvalidStrongNameKey));
+                }
+
+                // get the key into managed memory
+                byte[] key = new byte[generatedSize];
+                Marshal.Copy(keyBlob, key, 0, (int)generatedSize);
+
+                // write the key to the specified file
+                using (FileStream snkStream = new FileStream(filename, FileMode.Create, FileAccess.Write)) {
+                    using (BinaryWriter snkWriter = new BinaryWriter(snkStream)) {
+                        snkWriter.Write(key);
+                    }
+                }
+            }
+            finally {
+                // release the unmanaged memory the key resides in
+                if (keyBlob != IntPtr.Zero) {
+                    StrongNameHelpers.StrongNameFreeBuffer(keyBlob);
+                }
+            }
+
+            return true;
+        }
+    }
+}