(Excel) Socket TLS Mutual Authentication (Client-Side Certificate)

This example demonstrates how to provide a client-side certificate, also known as "two-way authentication" or "mutual authentication" for servers that require a client certificate.

Download Excel Class Modules Chilkat Excel Class Modules

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

Dim sock As Chilkat.Socket
Set sock = Chilkat.NewSocket

' Set the certificate to be used for mutual TLS authentication
' (i.e. sets the client-side certificate for two-way TLS authentication)

success = sock.SetSslClientCertPfx("/home/bob/pfxFiles/myClientSideCertWithPrivateKey.pfx","pfxPassword")
If (success <> True) Then
    Debug.Print sock.LastErrorText
    Exit Sub
End If

' Note: The certificate used for the client-side of TLS mutual authentication
' must have the associated private key available. (.pfx/.p12 files typically store both
' the certificate and associated private key.)

' Establish the connection using the socket object (with client certificate authentication).

bTls = True

port = 443

maxWaitMs = 5000
success = sock.Connect("www.example.com",port,bTls,maxWaitMs)
If (success <> True) Then
    Debug.Print "Connect Failure Error Code: "; sock.ConnectFailReason
    Debug.Print sock.LastErrorText
    Exit Sub
End If

' At this point, the Socket object is connected and authenticated using the client-side cert

' ...
' ..