Java

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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import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.MailMan;

public class ChilkatExample {

    public static void main(String[] args) {
        boolean success = 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.

        MailMan mailman = new MailMan();

        // Configure the SMTP server connection.
        mailman.setSmtpHost("smtp.example.com");
        mailman.setSmtpPort(465);
        mailman.setSmtpSsl(true);
        mailman.setSmtpUsername("user@example.com");
        mailman.setSmtpPassword("myPassword");

        // Load the client certificate from a PEM file.
        try {
            mailman.setSslClientCertPem("qa_data/certs/client.pem", "pem_password");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        success = mailman.verifySmtpLogin();
        if (!success) {
            System.out.println(mailman.getLastErrorText());
            return;
        }

        System.out.println("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.
    }
}