(VB.NET UWP/WinRT) Get the Server Certificate, Certificate Chain, and Root CA Certificate

Demonstrates how to get the HTTP server certificate, its certificate chain, and the root CA certificate.

Chilkat Universal Windows Platform (UWP) / WinRT Downloads Chilkat for the Universal Windows Platform (UWP)

' This example assumes the Chilkat API to have been previously unlocked.
' See Global Unlock Sample for sample code.

Dim http As New Chilkat.Http

' We're getting the SSL/TLS certificate, so make sure to connect to the SSL/TLS port (443).
Dim sslCert As Chilkat.Cert = Await http.GetServerSslCertAsync("nationalgeographic.com",443)
If (http.LastMethodSuccess = False) Then
    Debug.WriteLine(http.LastErrorText)
    Exit Sub
End If


' Note: Prior to v9.5.0.50, this method would fail if the certificate chain could not 
' be completed to the root.  Starting in v9.5.0.50, the incomplete certificate chain 
' will be returned.  The certificate chain's ReachesRoot property can be examined to 
' see if the chain was completed to the root.
Dim certChain As Chilkat.CertChain = sslCert.GetCertChain()
If (sslCert.LastMethodSuccess = False) Then
    Debug.WriteLine(sslCert.LastErrorText)

    Exit Sub
End If


Dim i As Integer = 0
Dim numCerts As Integer = certChain.NumCerts
While i < numCerts
    Dim cert As Chilkat.Cert = certChain.GetCert(i)
    Debug.WriteLine("SubjectDN " & i & ": " & cert.SubjectDN)
    Debug.WriteLine("IssuerDN " & i & ": " & cert.IssuerDN)

    i = i + 1
End While

' If the certificate chain reaches the root CA cert, then the last cert in the chain
' is the root CA cert.
If (certChain.ReachesRoot = True) Then
    Dim caCert As Chilkat.Cert = certChain.GetCert(numCerts - 1)
    Debug.WriteLine("CA Root Cert: " & caCert.SubjectDN)

End If