PHP ActiveX

Set the Signing Certificate for an Email

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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<?php

$success = 0;

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

$email = new COM("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.
$cert = new COM("Chilkat.Cert");
$success = $cert->LoadPfxFile('qa_data/certs/signer.pfx','pfx_password');
if ($success == 0) {
    print $cert->LastErrorText . "\n";
    exit;
}

//  Set the certificate used to create the signature.
$success = $email->SetSigningCert($cert);
if ($success == 0) {
    print $email->LastErrorText . "\n";
    exit;
}

//  Request that the email be sent with a digital signature.
$email->SendSigned = 1;

print 'Signing certificate set.' . "\n";

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

?>