(PHP ActiveX) Send Signed Email using PFX File

Demonstrates how to send a signed email using a digital certificate w/ private key stored in a PFX file.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows Note: The php_com_dotnet.dll may need to be enabled inside of php.ini.

<?php

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

// The mailman object is used for sending and receiving email.
// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.MailMan')
$mailman = new COM("Chilkat.MailMan");

// Set the SMTP server.
$mailman->SmtpHost = 'smtp.mymailserver.com';

// Create a new email object
// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Email')
$email = new COM("Chilkat.Email");

$email->Subject = 'This email is signed';
$email->Body = 'This is a digitally signed mail';
$email->From = 'Chilkat Admin <admin@chilkatsoft.com>';
$success = $email->AddTo('Chilkat Support','support@chilkatsoft.com');

// Indicate that the email should be sent signed.
$email->SendSigned = 1;

// Tell the mailman to use a PFX file as a source for locating
// the certificate and private key required for signing.
// The certificate chosen for signing will be the one that
// matches the sender's email address, which also has
// a private key.  All intermediate certs in the chain of 
// authentication, up to and including the root, will
// be included in the signature.
$success = $mailman->AddPfxSourceFile('/pfx_files/chilkatsoft_secret.pfx','secret');
if ($success != 1) {
    print $mailman->LastErrorText . "\n";
    exit;
}

// Signed email can be sent in two different ways.  
// In a multipart/signed email, the signature is attached as a separate MIME part.
// In an opaque email (signedData) the content of the email is encapsulated within the signature
// and the email is sent as "application/pkcs7-mime". 
// Either should be fine, but some receiving systems might require one or the other..
$mailman->OpaqueSigning = 0;

// Send a signed email.
$success = $mailman->SendEmail($email);
if ($success != 1) {
    print $mailman->LastErrorText . "\n";
}
else {
    // The LastErrorText property provides information
    // even when successful.
    print $mailman->LastErrorText . "\n";
    print 'Mail Sent!' . "\n";
}


?>