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Use a PFX TLS Client Certificate

Demonstrates the Chilkat MailMan.SetSslClientCertPfx method, which sets the client-side certificate for SSL/TLS connections, loading it from a PFX/PKCS#12 file. The first argument is the path to the PFX file and the second is its password. This example loads a client certificate directly from a PFX.

Background: This is the convenience form of SetSslClientCert: rather than loading a Cert object first, you point straight at the PFX file and password. A PFX (PKCS#12) bundles the certificate with its private key — exactly what mutual TLS requires, since the client must prove possession of the key during the handshake. It is the usual client-credential format on Windows.

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const std = @import("std");
const chilkat = @import("chilkat");

pub fn main(init: std.process.Init) !void {
    const alloc = init.arena.allocator();

    var success: bool = false;

    // Demonstrates the MailMan.SetSslClientCertPfx method, which sets the client-side
    // certificate for SSL/TLS connections, loading it from a PFX/PKCS#12 file.  The 1st argument
    // is the PFX path and the 2nd is the PFX password.

    const mailman = try chilkat.MailMan.init();
    defer mailman.deinit();

    // 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 directly from a PFX file.
    success = if (mailman.setSslClientCertPfx("qa_data/certs/client.pfx", "pfx_password")) true else |_| false;
    if (!success) {
        std.debug.print("{s}\n", .{try mailman.getLastErrorText(alloc)});
        return;
    }

    success = mailman.verifySmtpLogin();
    if (!success) {
        std.debug.print("{s}\n", .{try mailman.getLastErrorText(alloc)});
        return;
    }

    std.debug.print("Connected using a PFX TLS client certificate.\n", .{});

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