Verify whether an executable is signed or not (signtool used to sign that exe)

In my application I need to verify whether it's signed or not. If it's signed continue the execution and exit the application 开发者_运维问答if not. The signtool will be used to sign the application. Is there any C# code to do that?

Here is a utility method that does it:

var signed = IsSigned(@"c:\windows\explorer.exe");
...
public static bool IsSigned(string filePath)
{
    if (filePath == null)
        throw new ArgumentNullException(nameof(filePath));

    var file = new WINTRUST_FILE_INFO();
    file.cbStruct = Marshal.SizeOf(typeof(WINTRUST_FILE_INFO));
    file.pcwszFilePath = filePath;

    var data = new WINTRUST_DATA();
    data.cbStruct = Marshal.SizeOf(typeof(WINTRUST_DATA));
    data.dwUIChoice = WTD_UI_NONE;
    data.dwUnionChoice = WTD_CHOICE_FILE;
    data.fdwRevocationChecks = WTD_REVOKE_NONE;
    data.pFile = Marshal.AllocHGlobal(file.cbStruct);
    Marshal.StructureToPtr(file, data.pFile, false);

    int hr;
    try
    {
        hr = WinVerifyTrust(INVALID_HANDLE_VALUE, WINTRUST_ACTION_GENERIC_VERIFY_V2, ref data);
    }
    finally
    {
        Marshal.FreeHGlobal(data.pFile);
    }
    return hr == 0;
}

[StructLayoutAttribute(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
private struct WINTRUST_FILE_INFO
{
    public int cbStruct;
    public string pcwszFilePath;
    public IntPtr hFile;
    public IntPtr pgKnownSubject;
}

[StructLayoutAttribute(LayoutKind.Sequential)]
private struct WINTRUST_DATA
{
    public int cbStruct;
    public IntPtr pPolicyCallbackData;
    public IntPtr pSIPClientData;
    public int dwUIChoice;
    public int fdwRevocationChecks;
    public int dwUnionChoice;
    public IntPtr pFile;
    public int dwStateAction;
    public IntPtr hWVTStateData;
    public IntPtr pwszURLReference;
    public int dwProvFlags;
    public int dwUIContext;
    public IntPtr pSignatureSettings;
}

private const int WTD_UI_NONE = 2;
private const int WTD_REVOKE_NONE = 0;
private const int WTD_CHOICE_FILE = 1;
private static readonly IntPtr INVALID_HANDLE_VALUE = new IntPtr(-1);
private static readonly Guid WINTRUST_ACTION_GENERIC_VERIFY_V2 = new Guid("{00AAC56B-CD44-11d0-8CC2-00C04FC295EE}");

[DllImport("wintrust.dll")]
private static extern int WinVerifyTrust(IntPtr hwnd, [MarshalAs(UnmanagedType.LPStruct)] Guid pgActionID, ref WINTRUST_DATA pWVTData);

    Try
        Dim objCertificate As New Security.Cryptography.X509Certificates.X509Certificate2(Security.Cryptography.X509Certificates.X509Certificate.CreateFromSignedFile(strFile))
        Return True

    Catch ex As Exception
        Return False
    End Try

   private bool IsAssemblySigned()
    {
        var assembly = Assembly.GetAssembly(GetType());

        var assemblyName = assembly.GetName();
        var key = assemblyName.GetPublicKey();
        return key.Length > 0;
    }

I would suggest you use the 'CryptUIWizDigitalSign' API. This link can be used as a reference.