VB.NET

Get the Server Certificate, Certificate Chain, and Root CA Certificate

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

Dim success As Boolean = False

' 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 New Chilkat.Cert
success = http.GetServerCert("apple.com",443,sslCert)
If (success = False) Then
    Debug.WriteLine(http.LastErrorText)
    Exit Sub
End If


Dim certChain As New Chilkat.CertChain
success = sslCert.BuildCertChain(certChain)
If (success = False) Then
    Debug.WriteLine(sslCert.LastErrorText)
    Exit Sub
End If


Dim cert As New Chilkat.Cert
Dim i As Integer = 0
Dim numCerts As Integer = certChain.NumCerts
While i < numCerts
    certChain.CertAt(i,cert)
    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 New Chilkat.Cert
    certChain.CertAt(numCerts - 1,caCert)
    Debug.WriteLine("CA Root Cert: " & caCert.SubjectDN)
End If