Set the Signing Certificate for an Email

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Demonstrates the Chilkat Email.SetSigningCert method, which sets the certificate (with access to its private key) used to create a digital signature when sending signed email. This example loads the signing certificate from a PFX, sets it, and enables signed sending.

Background: Signing uses your own private key (the opposite of encrypting, which uses the recipient's public key), so the signing certificate must include private-key access. A PFX (PKCS#12) file bundles the certificate and its private key together, which is why it is loaded here with LoadPfxFile. If the certificate and key are in separate files, use SetSigningCert2 instead.

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bool success = false;

//  Demonstrates the SetSigningCert method, which sets the certificate (with access to its
//  private key) used for creating a digital signature when sending signed email.

Chilkat.Email email = new Chilkat.Email();
email.Subject = "Signed email";
email.Body = "This message will be sent with a digital signature.";
email.From = "alice@example.com";
email.AddTo("Bob","bob@example.com");

//  Load a signing certificate together with its private key from a PFX file.
Chilkat.Cert cert = new Chilkat.Cert();
success = cert.LoadPfxFile("qa_data/certs/signer.pfx","pfx_password");
if (success == false) {
    Debug.WriteLine(cert.LastErrorText);
    return;
}

//  Set the certificate used to create the signature.
success = email.SetSigningCert(cert);
if (success == false) {
    Debug.WriteLine(email.LastErrorText);
    return;
}

//  Request that the email be sent with a digital signature.
email.SendSigned = true;

Debug.WriteLine("Signing certificate set.");

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