Signing in Linux

When I try to sign with `dotnet-mage -Sign Application.application -CertFile /root/file.pfx -Publisher "publisher"` in Linux it says

`Internal error, please try again. Unable to load shared library 'Kernel32.dll' or one of its dependencies. In order to help diagnose loading problems, consider setting the LD_DEBUG environment variable: libKernel32.dll: cannot open shared object file: No such file or directory`

I found in the source code, that CryptoAPI is only supported in Windows.
Are there any alternatives to get manifests signed without Windows?