RandomNumberGenerator.GetInt32 throws DllNotFoundException on iOS

[PieEatingNinjas]

Description

When using System.Security.Cryptography.RandomNumberGenerator.GetInt32 on iOS a DLLNotFoundException is thrown.

Exception message: libcoreclr.so
Stacktrace:

   at Interop.AppleCrypto.GetRandomBytes(Byte* pbBuffer, Int32 count) in System.Security.Cryptography.Algorithms.dll:token 0x600002e+0x0
   at System.Security.Cryptography.RandomNumberGeneratorImplementation.GetBytes(Byte* pbBuffer, Int32 count) in System.Security.Cryptography.Algorithms.dll:token 0x60001c3+0x0
   at System.Security.Cryptography.RandomNumberGeneratorImplementation.FillSpan(Span`1 data) in System.Security.Cryptography.Algorithms.dll:token 0x60001bd+0x15
   at System.Security.Cryptography.RandomNumberGenerator.GetInt32(Int32 fromInclusive, Int32 toExclusive) in System.Security.Cryptography.Algorithms.dll:token 0x60001e3+0x4b
   at System.Security.Cryptography.RandomNumberGenerator.GetInt32(Int32 toExclusive) in System.Security.Cryptography.Algorithms.dll:token 0x60001e4+0x14

No problems on Android or Windows.

Take a look at the Repro.

Steps to Reproduce

1. Create new MAUI project
2. Add using Microsoft.Maui.Hosting; in AppDelegate.cs
3. Add the following code to the constuctor of MainPage var x = RandomNumberGenerator.GetInt32(10);
4. See it crash when running the app on iOS

Tested on physical iPhone via Hot Restart.

Version with bug

Preview 10 (current)

Last version that worked well

Unknown/Other

Affected platforms

iOS

Affected platform versions

iOS 15.1

Did you find any workaround?

Using new Random().Next to generate a random number.

Relevant log output

[0:] An error occurred: 'libcoreclr.so'. Callstack: '   at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) in System.Private.CoreLib.dll:token 0x6004f51+0x6a'
The app has been terminated.

[Eilon]

Looks like the same root issue as #3406.

[Eilon]

Looks like this was fixed for .NET 6 RC1 as part of this PR: xamarin/xamarin-macios#12323 (I followed a trail starting at dotnet/runtime#58185)

[Eilon]

BTW if for some reason this still occurs on the most recent builds, please file an issue at https://github.com/xamarin/xamarin-macios with the details and versions you are running.