Added basic functionality to query package information.

PackageSupport.cs

@@ -0,0 +1,42 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace NSspi
+{
+    public static class PackageSupport
+    {
+        public static SecPkgInfo GetPackageCapabilities( string packageName )
+        {
+            SecPkgInfo info;
+            SecurityStatus status;
+            SecurityStatus freeStatus;
+
+            IntPtr rawInfoPtr;
+            
+            rawInfoPtr = new IntPtr();
+            info = new SecPkgInfo();
+
+            RuntimeHelpers.PrepareConstrainedRegions();
+            try
+            { }
+            finally
+            {
+                status = NativeMethods.QuerySecurityPackageInfo( packageName, ref rawInfoPtr );
+
+                if( status == SecurityStatus.OK && rawInfoPtr != IntPtr.Zero )
+                {
+                    Marshal.PtrToStructure( rawInfoPtr, info );
+                    freeStatus = NativeMethods.FreeContextBuffer( rawInfoPtr );
+                }
+            }
+
+            return info;
+        }
+
+    }
+}