(PHP Extension) POP3 Verify Signed (S/MIME) Email

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

Chilkat PHP Downloads PHP Extension for Windows, Linux, MacOS, Alpine Linux

<?php

include("chilkat.php");
// Use "chilkat_9_5_0.php" for versions of Chilkat < 10.0.0

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

$mailman = new CkMailMan();

// Set the POP3 server's hostname
$mailman->put_MailHost('pop.someMailServer.com');

// Set the POP3 login/password.
$mailman->put_PopUsername('myLogin');
$mailman->put_PopPassword('myPassword');

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

$i = 0;
while ($i < $sa->get_Count()) {

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

    // email is a CkEmail
    $email = $mailman->FetchEmail($uidl);
    if ($mailman->get_LastMethodSuccess() == false) {
        print $mailman->lastErrorText() . "\n";

        exit;
    }

    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->get_ReceivedSigned() == true) {

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

        // Check to see if the signatures were verified.
        if ($email->get_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 CkCert
            $cert = $email->GetSignedByCert();
            if ($email->get_LastMethodSuccess() == false) {
                print 'Failed to get signing certificate object.' . "\n";
            }
            else {
                print 'Signing cert: ' . $cert->subjectCN() . "\n";

            }

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

    }

    $i = $i + 1;
}

$mailman->Pop3EndSession();

?>