(Classic ASP) 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 ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

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

' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.Http")
set http = Server.CreateObject("Chilkat.Http")

' We're getting the SSL/TLS certificate, so make sure to connect to the SSL/TLS port (443).
' sslCert is a Chilkat.Cert
Set sslCert = http.GetServerSslCert("nationalgeographic.com",443)
If (http.LastMethodSuccess = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( http.LastErrorText) & "</pre>"
    Response.End
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.
' certChain is a Chilkat.CertChain
Set certChain = sslCert.GetCertChain()
If (sslCert.LastMethodSuccess = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( sslCert.LastErrorText) & "</pre>"

    Response.End
End If

i = 0
numCerts = certChain.NumCerts
Do While i < numCerts
    ' cert is a Chilkat.Cert
    Set cert = certChain.GetCert(i)
    Response.Write "<pre>" & Server.HTMLEncode( "SubjectDN " & i & ": " & cert.SubjectDN) & "</pre>"
    Response.Write "<pre>" & Server.HTMLEncode( "IssuerDN " & i & ": " & cert.IssuerDN) & "</pre>"

    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
    ' caCert is a Chilkat.Cert
    Set caCert = certChain.GetCert(numCerts - 1)
    Response.Write "<pre>" & Server.HTMLEncode( "CA Root Cert: " & caCert.SubjectDN) & "</pre>"

End If


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