Visual Basic 6.0

Use a PEM TLS Client Certificate

Demonstrates the Chilkat MailMan.SetSslClientCertPem method, which sets the client-side certificate for SSL/TLS connections, loading it from PEM data or from a PEM file. The first argument may contain the PEM text itself or a path to a PEM file; the second is the PEM password. This example loads the client certificate from a PEM file.

Background: PEM is the familiar Base64 text format bracketed by -----BEGIN CERTIFICATE----- lines, and a single PEM can hold both a certificate and its (optionally encrypted) private key. It is the common format in Unix/OpenSSL environments, whereas PFX is more typical on Windows. Because this method accepts either the PEM text or a filename, you can supply credentials straight from a config value or secret store without writing them to disk.

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Visual Basic 6.0

Dim success As Long
success = 0

'  Demonstrates the MailMan.SetSslClientCertPem method, which sets the client-side
'  certificate for SSL/TLS connections, loading it from PEM data or from a PEM file.  The
'  1st argument may contain PEM text or a PEM file path; the 2nd is the PEM password.

Dim mailman As New ChilkatMailMan

'  Configure the SMTP server connection.
mailman.SmtpHost = "smtp.example.com"
mailman.SmtpPort = 465
mailman.SmtpSsl = 1
mailman.SmtpUsername = "user@example.com"
mailman.SmtpPassword = "myPassword"

'  Load the client certificate from a PEM file.
success = mailman.SetSslClientCertPem("qa_data/certs/client.pem","pem_password")
If (success = 0) Then
    Debug.Print mailman.LastErrorText
    Exit Sub
End If

success = mailman.VerifySmtpLogin()
If (success = 0) Then
    Debug.Print mailman.LastErrorText
    Exit Sub
End If

Debug.Print "Connected using a PEM TLS client certificate."

'  Note: The path "qa_data/certs/client.pem" is a relative local filesystem path,
'  relative to the current working directory of the running application.