Swift

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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func chilkatTest() {
    var success: Bool = false

    //  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.

    let mailman = CkoMailMan()!

    //  Configure the SMTP server connection.
    mailman.smtpHost = "smtp.example.com"
    mailman.smtpPort = 465
    mailman.smtpSsl = true
    mailman.smtpUsername = "user@example.com"
    mailman.smtpPassword = "myPassword"

    //  Load the client certificate from a PEM file.
    success = mailman.setSslClientCertPem(pemDataOrPath: "qa_data/certs/client.pem", pemPassword: "pem_password")
    if success == false {
        print("\(mailman.lastErrorText!)")
        return
    }

    success = mailman.verifySmtpLogin()
    if success == false {
        print("\(mailman.lastErrorText!)")
        return
    }

    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.

}