(PHP ActiveX) Send Signed Email using PFX File (long version)

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;

// Load a PFX file into a certificate store object.
// Then locate the certificate matching the  sender's email address,
// and use it for signing.
// (a PFX file may contain more than one certificate.)
// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.CertStore')
$certStore = new COM("Chilkat.CertStore");
// The 1st argument is the path of the PFX file, the 2nd arg is the 
// PFX file's password:
$success = $certStore->LoadPfxFile('/pfx_files/chilkatsoft_secret.pfx','secret');
if ($success != 1) {
    print $certStore->LastErrorText . "\n";
    exit;
}

// cert is a Chilkat.Cert
$cert = $certStore->FindCertBySubjectE('admin@chilkatsoft.com');
if ($certStore->LastMethodSuccess == 0) {
    print $certStore->LastErrorText . "\n";
    exit;
}

// Alternatively, if a PFX file is known to contain a single certificate,
// you may load it directly into a Chilkat certificate object.
// This snippet of source code shows how:
// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Cert')
$cert2 = new COM("Chilkat.Cert");
// The 1st argument is the filename, the 2nd arg is the 
// PFX file's password:
$success = $cert2->LoadPfxFile('/pfx_files/chilkatsoft_secret.pfx','secret');
if ($success != 1) {
    print $cert2->LastErrorText . "\n";

    exit;
}

// This example will use the cert from the certStore...
$success = $email->SetSigningCert($cert);

// 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";
}


?>