`Sodium.Core` in `net7.0` work but crashes in `net7.0-maccatalyst`. Why? #79502

MartyIX · 2022-12-11T14:02:51Z

MartyIX
Dec 11, 2022

Hey .NET gurus

Would you possibly know a reason why a console application (net7.0) works with Sodium.Core library but when I attempt to call a Sodium.Core function from a vanilla .NET MacCatalyst application (net7.0-maccatalyst), my app crashes with DllNotFoundException because libsodium native library cannot be found (https://github.com/ektrah/libsodium-core/blob/4cc4f449bf186a825456204909996c9cbafb1175/src/Interop/Interop.Core.cs#L8).

I understand that the question is hard to answer but maybe you can just give me a pointer what might be wrong or how to debug the issue. I have spent days on this but given that I don't know low level details of MacCatalyst & .NET, it's pretty hard for me to understand the issue.

Can it possibly be because I need to bundle somehow the libsodium native library with my Mac Catalyst app?

Test console app

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net7.0</TargetFramework>
    <RootNamespace>libsodium_core_console</RootNamespace>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
  </PropertyGroup>

  <ItemGroup>
      <PackageReference Include="Sodium.Core" Version="1.3.1" />
  </ItemGroup>
</Project>

using Sodium;

internal class Program
{
    private static void Main(string[] args)
    {
        Console.WriteLine(SecretAeadAes.IsAvailable);
    }
}

Test MacCatalyst app

Create a vanilla MacCatalyst app using VS for MAC

Add

<ItemGroup>
    <PackageReference Include="Sodium.Core" Version="1.3.1" />
</ItemGroup>

Modify AppDelegate.cs as follows:

namespace libsodium_core_maccatalyst;

using Sodium; // <-- NEW LINE

[Register ("AppDelegate")]
public class AppDelegate : UIApplicationDelegate {
    public override UIWindow? Window {
	    get;
	    set;
    }

    public override bool FinishedLaunching (UIApplication application, NSDictionary launchOptions)
    {
	    // create a new window instance based on the screen size
	    Window = new UIWindow (UIScreen.MainScreen.Bounds);

	    // create a UIViewController with a single UILabel
	    var vc = new UIViewController ();
	    vc.View!.AddSubview (new UILabel (Window!.Frame) {
		    BackgroundColor = UIColor.SystemBackground,
		    TextAlignment = UITextAlignment.Center,
		    Text = SecretAeadAes.IsAvailable.ToString(), // <--- MODIFIED LINE
		    AutoresizingMask = UIViewAutoresizing.All,
	    });
	    Window.RootViewController = vc;

	    // make the window visible
	    Window.MakeKeyAndVisible ();

	    return true;
    }
}