Win32.cs

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using System.Runtime.InteropServices;
using Microsoft.Win32.SafeHandles;
 
namespace System.Security.Principal;
 
internal static class Win32
{
    internal static int OpenThreadToken(TokenAccessLevels dwDesiredAccess, System.Security.Principal.WinSecurityContext dwOpenAs, out SafeTokenHandle phThreadToken)
    {
        int num = 0;
        bool bOpenAsSelf = true;
        if (dwOpenAs == System.Security.Principal.WinSecurityContext.Thread)
        {
            bOpenAsSelf = false;
        }
        if (!global::Interop.Advapi32.OpenThreadToken((IntPtr)(-2), dwDesiredAccess, bOpenAsSelf, out phThreadToken))
        {
            if (dwOpenAs == System.Security.Principal.WinSecurityContext.Both)
            {
                bOpenAsSelf = false;
                num = 0;
                if (!global::Interop.Advapi32.OpenThreadToken((IntPtr)(-2), dwDesiredAccess, bOpenAsSelf, out phThreadToken))
                {
                    num = Marshal.GetHRForLastWin32Error();
                }
            }
            else
            {
                num = Marshal.GetHRForLastWin32Error();
            }
        }
        if (num != 0)
        {
            phThreadToken = null;
        }
        return num;
    }
 
    internal static int SetThreadToken(SafeTokenHandle hToken)
    {
        int result = 0;
        if (!global::Interop.Advapi32.SetThreadToken(IntPtr.Zero, hToken))
        {
            result = Marshal.GetHRForLastWin32Error();
        }
        return result;
    }
}