' 导入命名空间
Imports System.Security.Cryptography
Imports System.Security.Cryptography.X509Certificates
Imports System.IO

Class TestX509Chain

    Shared Sub Main(ByVal args() As String)
        'Create new X509 store from local certificate store.
        Dim store As New X509Store("MY", StoreLocation.CurrentUser)
        store.Open(OpenFlags.OpenExistingOnly Or OpenFlags.ReadWrite)

        'Output store information.
        Console.WriteLine("Store Information")
        Console.WriteLine("Number of certificates in the store: {0}", store.Certificates.Count)
        Console.WriteLine("Store location: {0}", store.Location)
        Console.WriteLine("Store name: {0} {1}", store.Name, Environment.NewLine)

        'Put certificates from the store into a collection so user can select one.
        Dim fcollection As X509Certificate2Collection = CType(store.Certificates, X509Certificate2Collection)
        Dim collection As X509Certificate2Collection = X509Certificate2UI.SelectFromCollection(fcollection, "Select an X509 Certificate", "Choose a certificate to examine.", X509SelectionFlag.SingleSelection)
        Dim certificate As X509Certificate2 = collection(0)
        X509Certificate2UI.DisplayCertificate(certificate)

        'Output chain information of the selected certificate.
        Dim ch As New X509Chain()
        ch.ChainPolicy.RevocationMode = X509RevocationMode.Online
        ch.Build(certificate)
        Console.WriteLine("Chain Information")
        Console.WriteLine("Chain revocation flag: {0}", ch.ChainPolicy.RevocationFlag)
        Console.WriteLine("Chain revocation mode: {0}", ch.ChainPolicy.RevocationMode)
        Console.WriteLine("Chain verification flag: {0}", ch.ChainPolicy.VerificationFlags)
        Console.WriteLine("Chain verification time: {0}", ch.ChainPolicy.VerificationTime)
        Console.WriteLine("Chain status length: {0}", ch.ChainStatus.Length)
        Console.WriteLine("Chain application policy count: {0}", ch.ChainPolicy.ApplicationPolicy.Count)
        Console.WriteLine("Chain certificate policy count: {0} {1}", ch.ChainPolicy.CertificatePolicy.Count, Environment.NewLine)

        'Output chain element information.
        Console.WriteLine("Chain Element Information")
        Console.WriteLine("Number of chain elements: {0}", ch.ChainElements.Count)
        Console.WriteLine("Chain elements synchronized? {0} {1}", ch.ChainElements.IsSynchronized, Environment.NewLine)

        Dim element As X509ChainElement
        For Each element In ch.ChainElements
            Console.WriteLine("Element issuer name: {0}", element.Certificate.Issuer)
            Console.WriteLine("Element certificate valid until: {0}", element.Certificate.NotAfter)
            Console.WriteLine("Element certificate is valid: {0}", element.Certificate.Verify())
            Console.WriteLine("Element error status length: {0}", element.ChainElementStatus.Length)
            Console.WriteLine("Element information: {0}", element.Information)
            Console.WriteLine("Number of element extensions: {0}{1}", element.Certificate.Extensions.Count, Environment.NewLine)

            If ch.ChainStatus.Length > 1 Then
                Dim index As Integer
                For index = 0 To element.ChainElementStatus.Length
                    Console.WriteLine(element.ChainElementStatus(index).Status)
                    Console.WriteLine(element.ChainElementStatus(index).StatusInformation)
                Next index
            End If
        Next element
        store.Close()
    End Sub
End Class