Visual Basic 6.0

SSL Client Certificate

See more Socket/SSL/TLS Examples

Demonstrates how to connect to an SSL server using a client-side certificate, send a simple message, receive a simple response, and disconnect. Visual Basic 6.0

Dim success As Long
success = 0

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

Dim socket As New ChilkatSocket

' Create an instance of a certificate store object, load a PFX file,
' locate the certificate we need, and use it for signing.
' (a PFX file may contain more than one certificate.)
Dim certStore As New ChilkatCertStore
' The 1st argument is the filename, the 2nd arg is the 
' PFX file's password:
success = certStore.LoadPfxFile("chilkat_secret.pfx","secret")
If (success <> 1) Then
    Debug.Print certStore.LastErrorText
    Exit Sub
End If

' Find the certificate by the subject common name:
Dim jsonCN As New ChilkatJsonObject
success = jsonCN.UpdateString("CN","cert common name")

Dim cert As New ChilkatCert
success = certStore.FindCert(jsonCN,cert)
If (success = 0) Then
    Debug.Print certStore.LastErrorText
    Exit Sub
End If

success = socket.SetSslClientCert(cert)

Dim ssl As Long
ssl = 1
Dim maxWaitMillisec As Long
maxWaitMillisec = 20000

' The SSL server hostname may be an IP address, a domain name,
' or "localhost".  You'll need to change this:
Dim sslServerHost As String
sslServerHost = "123.123.88.88"
Dim sslServerPort As Long
sslServerPort = 8123

' Connect to the SSL server:
success = socket.Connect(sslServerHost,sslServerPort,ssl,maxWaitMillisec)
If (success <> 1) Then
    Debug.Print socket.LastErrorText
    Exit Sub
End If

' Set maximum timeouts for reading an writing (in millisec)
socket.MaxReadIdleMs = 20000
socket.MaxSendIdleMs = 20000

' Send a "Hello Server! -EOM-" message:
success = socket.SendString("Hello Server! -EOM-")
If (success <> 1) Then
    Debug.Print socket.LastErrorText
    Exit Sub
End If

' The server (in this example) is going to send a "Hello Client! -EOM-" 
' message.  Read it:
Dim receivedMsg As String
receivedMsg = socket.ReceiveUntilMatch("-EOM-")
If (socket.LastMethodSuccess <> 1) Then
    Debug.Print socket.LastErrorText
    Exit Sub
End If

' Close the connection with the server
' Wait a max of 20 seconds (20000 millsec)
success = socket.Close(20000)

Debug.Print receivedMsg