X509Chain Class

[marcialwushu]

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

class TestX509Chain
{
    static void Main(string[] args)
    {
        //Create new X509 store from local certificate store.
        X509Store store = new X509Store("MY", StoreLocation.CurrentUser);
        store.Open(OpenFlags.OpenExistingOnly | 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.
        X509Certificate2Collection fcollection = (X509Certificate2Collection)store.Certificates;
        X509Certificate2Collection collection = X509Certificate2UI.SelectFromCollection(fcollection, "Select an X509 Certificate", "Choose a certificate to examine.", X509SelectionFlag.SingleSelection);
        X509Certificate2 certificate = collection[0];
        X509Certificate2UI.DisplayCertificate(certificate);

        //Output chain information of the selected certificate.
        X509Chain ch = 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);
    
        foreach (X509ChainElement 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)
            {
                for (int index = 0; index < element.ChainElementStatus.Length; index++)
                {
                    Console.WriteLine (element.ChainElementStatus[index].Status);
                    Console.WriteLine (element.ChainElementStatus[index].StatusInformation);
                }
            }
        }
        store.Close();
    }
}

[marcialwushu]

https://docs.microsoft.com/en-us/dotnet/api/system.security.cryptography.x509certificates.x509chain?view=net-6.0

[marcialwushu]

public static X509ContentType GetCertContentType(byte[] rawData)
        {
            if (rawData == null || rawData.Length == 0)
            {
                throw new ArgumentException(SR.GetString("Arg_EmptyOrNullArray"), "rawData");
            }

            uint contentType = QueryCertBlobType(rawData);
            return X509Utils.MapContentType(contentType);
        }

[marcialwushu]

Dim certPath = "C:\Users\08353153\Documents\Visual Studio 2015\Projects\WindowsApplication2\WindowsApplication2\bin\Debug\8870-thebigchess.pfx"
    Dim certPass = "eduSTAR.NET"
    Dim Collection As New X509Certificate2Collection
    Collection.Import(certPath, certPass, X509KeyStorageFlags.PersistKeySet)

    Dim certOne As X509Certificate2 = Collection(0)
    Dim certTwo As X509Certificate2 = Collection(2)
    Dim certThree As X509Certificate2 = Collection(1)

    Dim personal As New X509Store(StoreName.My, StoreLocation.LocalMachine)
    personal.Open(OpenFlags.ReadWrite)
    personal.Add(certOne)
    personal.Close()

    Dim trust As New X509Store(StoreName.Root, StoreLocation.LocalMachine)
    trust.Open(OpenFlags.ReadWrite)
    trust.Add(certTwo)
    trust.Close()

    Dim intermed As New X509Store(StoreName.CertificateAuthority, StoreLocation.LocalMachine)
    intermed.Open(OpenFlags.ReadWrite)
    intermed.Add(certThree)
    intermed.Close()