如何验证已签名的DLL已经由我签名？

using System;
using System.IO;
using System.Runtime.InteropServices;
using System.Security.Cryptography.X509Certificates;

public class Authenticode
{
    [DllImport("Wintrust.dll", ExactSpelling = true, SetLastError = false, CharSet = CharSet.Unicode)]
    static extern bool WinVerifyTrust(IntPtr hwnd, Guid pgActionID, WinTrustData pWVTData);

    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
    struct WinTrustData
    {
        public uint StructSize;
        public IntPtr PolicyCallbackData;
        public IntPtr SIPClientData;
        public uint UIChoice;
        public uint RevocationChecks;
        public uint UnionChoice;
        public IntPtr FileOrCatalogOrBlobOrSgnrOrCert;
        public IntPtr StateAction;
        public IntPtr StateData;
        public string URLReference;
        public uint ProviderFlags;
        public uint UIContext;
        public string SignatureSettings;
    }

    const int WINTRUST_ACTION_GENERIC_VERIFY_V2 = 102;

    static bool Verify(string fileName)
    {
        WinTrustData wtd = new WinTrustData();
        wtd.StructSize = (uint)Marshal.SizeOf(typeof(WinTrustData));
        wtd.UnionChoice = 1;
        wtd.FileOrCatalogOrBlobOrSgnrOrCert = Marshal.StringToHGlobalUni(fileName);
        wtd.UIChoice = 2;

        bool result = WinVerifyTrust(IntPtr.Zero, new Guid("{00AAC56B-CD44-11d0-8CC2-00C04FC295EE}"), wtd);

        Marshal.FreeHGlobal(wtd.FileOrCatalogOrBlobOrSgnrOrCert);

        return result;
    }

    static void Main(string[] args)
    {
        string dllPath = @"C:\path\to\your\dll.dll";
        bool isVerified = Verify(dllPath);

        if (isVerified)
        {
            Console.WriteLine("DLL is signed and verified.");
        }
        else
        {
            Console.WriteLine("DLL is not signed or verification failed.");
        }
    }
}