POP3 Verify Signed (S/MIME) Email

Demonstrates how to download and verify digitally signed S/MIME email.

Download Chilkat Email ActiveX

<?php

$mailman = new COM("Chilkat.MailMan2");

//  Any string argument automatically begins the 30-day trial.
$success = $mailman->UnlockComponent('30-day trial');
if ($success != true) {
    print $mailman->lastErrorText() . "\n";
    exit;
}

//  Set the POP3 server's hostname
$mailman->MailHost = 'mail.chilkatsoft.com';

//  Set the POP3 login/password.
$mailman->PopUsername = 'myLogin';
$mailman->PopPassword = 'myPassword';

// sa is a Chilkat.CkStringArray
$sa = $mailman->GetUidls();
if (is_null($sa)) {
    print $mailman->lastErrorText() . "\n";
    exit;
}

$n = $sa->Count;

for ($i = 0; $i <= $n - 1; $i++) {

    $uidl = $sa->getString($i);

    // email is a Chilkat.Email
    $email = $mailman->FetchEmail($uidl);
    if (is_null($email)) {
        print $mailman->lastErrorText() . "\n";
        break;
    }

    print $email->from() . "\n";
    print $email->subject() . "\n";

    //  The security layers of signed and/or encrypted emails
    //  are automatically "unwrapped" when loaded into
    //  a Chilkat email object.
    //  An application only needs to check to see if an email
    //  was received signed or encrypted, and then examine
    //  the success/failure.  For example:
    if ($email->ReceivedSigned == true) {

        print 'This email was signed.' . "\n";

        //  Check to see if the signatures were verified.
        if ($email->SignaturesValid == true) {
            print 'Digital signature(s) verified.' . "\n";

            print 'Signer: ' . $email->signedBy() . "\n";

            //  The certificate used for signing may be obtained
            //  by calling email.GetSignedByCert.

            // cert is a Chilkat.Cert
            $cert = $email->GetSignedByCert();
            if (is_null($cert)) {
                print 'Failed to get signing certificate object.' . "\n";
            }
            else {
                print 'Signing cert: ' . $cert->subjectCN() . "\n";

            }

        }
        else {
            print 'Digital signature verification failed.' . "\n";
        }

    }

}

$mailman->Pop3EndSession();
?>