(Visual Basic 6.0) 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.

Note: This example requires Chilkat v11.0.0 or greater.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

Dim success As Long
success = 0

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

Dim http As New ChilkatHttp

' We're getting the SSL/TLS certificate, so make sure to connect to the SSL/TLS port (443).
Dim sslCert As New ChilkatCert
success = http.GetServerCert("apple.com",443,sslCert)
If (success = 0) Then
    Debug.Print http.LastErrorText
    Exit Sub
End If

Dim certChain As New ChilkatCertChain
success = sslCert.BuildCertChain(certChain)
If (success = 0) Then
    Debug.Print sslCert.LastErrorText
    Exit Sub
End If

Dim cert As New ChilkatCert
Dim i As Long
i = 0
Dim numCerts As Long
numCerts = certChain.NumCerts
Do While i < numCerts
    success = certChain.CertAt(i,cert)
    Debug.Print "SubjectDN " & i & ": " & cert.SubjectDN
    Debug.Print "IssuerDN " & i & ": " & cert.IssuerDN
    i = i + 1
Loop

' If the certificate chain reaches the root CA cert, then the last cert in the chain
' is the root CA cert.
If (certChain.ReachesRoot = 1) Then
    Dim caCert As New ChilkatCert
    success = certChain.CertAt(numCerts - 1,caCert)
    Debug.Print "CA Root Cert: " & caCert.SubjectDN
End If