System.Security.Cryptography, link.xml and bytecode stripping

I am trying to create an iOS build with stripping level set to strip bytecode.

In my project I have a test certificate validator that looks something like this:

 public static bool Validator (object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors PolicyErrors)
 {
     Debug.Log("This is actually working!!");
     return true;
 }

and my link.xml looks like this:

 <linker>
        <assembly fullname="mscorlib">
                <namespace fullname="System.Security.Cryptography" preserve="all"/>
        </assembly>
 </linker>

My problem is that even my validator never gets hit and I'm getting security errors from my server. I read in the troubleshooting guide and build optimization guide that there is problems with reflection and using System.Security.Cryptography types and methods so, that is where I got my example for the link.xml file.

Is there any way to get this to work?

I've tried to put a lot of things into the link.xml and none of it seems to work. I even tried what this guy was doing: Crash on a stripped iOS binary

I'm using the WebClient class that is why I have to use a cert validator. I've gotten to the point of no return on using this, that is why I can't switch to the WWW class.

Thanks in advance!

Update: I opened the System.dll file that gets created from the build process and it looks as though all the referenced classes that I need are in there, but the above ServicePointManager.ServerCertificateValidationCallback is never being hit.