embeddable-dll-service: add more robust example for .NET 5

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

1 files changed, 33 insertions, 0 deletions

diff --git a/embeddable-dll-service/csharp/TunnelDll/Keypair.cs b/embeddable-dll-service/csharp/TunnelDll/Keypair.cs
new file mode 100644
index 00000000..146d56e0
--- /dev/null
+++ b/embeddable-dll-service/csharp/TunnelDll/Keypair.cs
@@ -0,0 +1,33 @@
+/* SPDX-License-Identifier: MIT
+ *
+ * Copyright (C) 2019-2021 WireGuard LLC. All Rights Reserved.
+ */
+
+using System;
+using System.Runtime.InteropServices;
+
+namespace Tunnel
+{
+    public class Keypair
+    {
+        public readonly string Public;
+        public readonly string Private;
+
+        public Keypair(string pub, string priv)
+        {
+            Public = pub;
+            Private = priv;
+        }
+
+        [DllImport("tunnel.dll", EntryPoint = "WireGuardGenerateKeypair", CallingConvention = CallingConvention.Cdecl)]
+        private static extern bool WireGuardGenerateKeypair(byte[] publicKey, byte[] privateKey);
+
+        public static Keypair Generate()
+        {
+            var publicKey = new byte[32];
+            var privateKey = new byte[32];
+            WireGuardGenerateKeypair(publicKey, privateKey);
+            return new Keypair(Convert.ToBase64String(publicKey), Convert.ToBase64String(privateKey));
+        }
+    }
+}