public static string FindPfxbyThubmprintinLinux(string thumbprint)
    {
        if (string.IsNullOrEmpty(thumbprint))
            return $"Certificate with thumbprint {thumbprint} was not found";

        string finalPath = $"/var/ssl/private/{thumbprint}.p12";
        var bytes2 = File.ReadAllBytes(finalPath);
        var cert = new X509Certificate2(bytes2);
        return cert.ToString(); 
    }

using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.FileProviders;
using System.Security.Cryptography.X509Certificates;

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.

var app = builder.Build();

// Configure the HTTP request pipeline.

app.UseHttpsRedirection();

app.UseStaticFiles(new StaticFileOptions()
{
    FileProvider = new PhysicalFileProvider(Path.Combine(Directory.GetCurrentDirectory(), "Images")),
    RequestPath = new PathString("/Images")
});



app.MapGet("/loadpfxbyname", ([FromQuery(Name = "name")] string filename, [FromQuery(Name = "pwd")] string pwd) =>
{
    var content = pfxTesting.LoadPfx(filename, pwd);
    return content;
});

app.MapGet("/loadpfx/{pwd}", (string pwd) =>
{

    var content = pfxTesting.LoadPfx(null, pwd);
    return content;
});

app.MapGet("/findpfx/{certThumbprint}", (string certThumbprint) =>
{

    var content = pfxTesting.FindPfx(certThumbprint);
    return content;
});



app.Run();

class pfxTesting
{
    public static string LoadPfx(string? filename, string password = "")
    {
        try
        {
            if (filename == null) filename = "contoso.com.pfx";

            var bytes = File.ReadAllBytes(filename);
            var cert = new X509Certificate2(bytes, password);

            return cert.ToString();
        }
        catch (Exception ex)
        {
            return ex.Message;
        }
    }

    public static string FindPfx(string certThumbprint = "")
    {
        try
        {
            bool validOnly = false;
            using (X509Store certStore = new X509Store(StoreName.My, StoreLocation.CurrentUser))
            {
                certStore.Open(OpenFlags.ReadOnly);

                X509Certificate2Collection certCollection = certStore.Certificates.Find(
                                            X509FindType.FindByThumbprint,
                                            // Replace below with your certificate's thumbprint
                                            certThumbprint,
                                            validOnly);
                // Get the first cert with the thumbprint
                X509Certificate2 cert = certCollection.OfType<X509Certificate2>().FirstOrDefault();

                if (cert is null)
                    return FindPfxbyThubmprintinLinux(certThumbprint);
                    //throw new Exception($"Certificate with thumbprint {certThumbprint} was not found");

                return cert.ToString();

            }
        }
        catch (Exception ex) { return ex.Message; }
    }

    public static string FindPfxbyThubmprintinLinux(string thumbprint)
    {
        if (string.IsNullOrEmpty(thumbprint))
            return $"Certificate with thumbprint {thumbprint} was not found";

        string finalPath = $"/var/ssl/private/{thumbprint}.p12";
        var bytes2 = File.ReadAllBytes(finalPath);
        var cert = new X509Certificate2(bytes2);
        return cert.ToString(); 
    }
}