Set a TLS Client Certificate for IMAP

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Demonstrates the Chilkat Imap.SetSslClientCert method, which supplies a client certificate for TLS client-certificate authentication. The only argument is a Cert object that must provide access to its private key. Call it before connecting. This example loads the certificate from a PFX file.

Note: The certificate path is relative to the application's current working directory. Supply the path to your own certificate file.

Background: Most IMAP servers authenticate with a username and password only. A few high-security deployments additionally require mutual TLS, where the client presents its own certificate during the handshake. Because that happens as part of connecting, the certificate must be set before Connect — setting it afterward has no effect on the already-established connection.

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bool success = false;

//  Demonstrates the Imap.SetSslClientCert method, which supplies a client certificate for TLS
//  client-certificate authentication.  The only argument is a Cert object.  It must be called
//  before connecting.

Chilkat.Imap imap = new Chilkat.Imap();

imap.Ssl = true;
imap.Port = 993;

//  The PFX password is not hard-coded in source.  Insert code here to obtain it from an
//  interactive prompt, environment variable, or a secrets vault.
string pfxPassword;

//  Load the client certificate (and its private key) from a PFX file.
Chilkat.Cert cert = new Chilkat.Cert();
success = cert.LoadPfxFile("qa_data/client.pfx",pfxPassword);
if (success == false) {
    Debug.WriteLine(cert.LastErrorText);
    return;
}

//  Provide the client certificate BEFORE connecting.
success = imap.SetSslClientCert(cert);
if (success == false) {
    Debug.WriteLine(imap.LastErrorText);
    return;
}

success = imap.Connect("imap.example.com");
if (success == false) {
    Debug.WriteLine(imap.LastErrorText);
    return;
}

success = imap.Login("user@example.com","myPassword");
if (success == false) {
    Debug.WriteLine(imap.LastErrorText);
    return;
}

success = imap.Disconnect();
if (success == false) {
    Debug.WriteLine(imap.LastErrorText);
    return;
}