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Question by superdev · Aug 20, 2013 at 05:08 AM · httpsstrippingcryptographywebclient

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.

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Answer by Lars-Blaabjerg · Aug 08, 2014 at 09:19 AM

Add this to link.xml:

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

It seems some of the classes needed, used through reflection, are in the System assembly rather than in mscorlib.

I use the "Strip assemblies" option. I don't know if that makes a difference.

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Answer by anton_breusov · Apr 21, 2016 at 02:30 PM

You can try following link.xml:

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

The problem is that Crypto code is mixed in many assemblies, not just System and mscorlib.

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