Unicode C

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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Unicode C

#include <C_CkMailManW.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkMailManW mailman;

    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 = CkMailManW_Create();

    //  Configure the SMTP server connection.
    CkMailManW_putSmtpHost(mailman,L"smtp.example.com");
    CkMailManW_putSmtpPort(mailman,465);
    CkMailManW_putSmtpSsl(mailman,TRUE);
    CkMailManW_putSmtpUsername(mailman,L"user@example.com");
    CkMailManW_putSmtpPassword(mailman,L"myPassword");

    //  Load the client certificate from a PEM file.
    success = CkMailManW_SetSslClientCertPem(mailman,L"qa_data/certs/client.pem",L"pem_password");
    if (success == FALSE) {
        wprintf(L"%s\n",CkMailManW_lastErrorText(mailman));
        CkMailManW_Dispose(mailman);
        return;
    }

    success = CkMailManW_VerifySmtpLogin(mailman);
    if (success == FALSE) {
        wprintf(L"%s\n",CkMailManW_lastErrorText(mailman));
        CkMailManW_Dispose(mailman);
        return;
    }

    wprintf(L"Connected using a PEM TLS client certificate.\n");

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


    CkMailManW_Dispose(mailman);

    }