(PHP ActiveX) IMAP Download and Verify Signed MIME

Downloads the original MIME of a digitally signed email and saves the .p7s signature along with other MIME parts. It then imports the email into a Chilkat email object to unwrap the S/MIME and verify the signature, and subsequently saves the attachments if they haven't been saved already.

Note: This example requires Chilkat v11.0.0 or greater.

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

$success = 0;

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

$imap = new COM("Chilkat.Imap");

// Connect to an IMAP server.
// Use TLS
$imap->Ssl = 1;
$imap->Port = 993;
$success = $imap->Connect('imap.example.com');
if ($success == 0) {
    print $imap->LastErrorText . "\n";
    exit;
}

$success = $imap->Login('myLogin','myPassword');
if ($success == 0) {
    print $imap->LastErrorText . "\n";
    exit;
}

// Select an IMAP mailbox
$success = $imap->SelectMailbox('Inbox');
if ($success == 0) {
    print $imap->LastErrorText . "\n";
    exit;
}

// Download the 1st email (as MIME) in the Inbox by sequence number.
$sbMime = new COM("Chilkat.StringBuilder");
$success = $imap->FetchSingleAsMimeSb(1,0,$sbMime);
if ($success == 0) {
    print $imap->LastErrorText . "\n";
    exit;
}

// Load it into a MIME object and check to see if it is signed
$mime = new COM("Chilkat.Mime");
$mime->LoadMimeSb($sbMime);
$alreadySavedParts = 0;
if ($mime->ContainsSignedParts() == 1) {

    // This will save the .p7s and other parts...
    $st = new COM("Chilkat.StringTable");
    $success = $mime->PartsToFiles('c:/temp/qa_output',$st);
    if ($success == 1) {
        $numFiles = $st->Count;
        $i = 0;
        while ($i < $numFiles) {
            print 'Created: ' . $st->stringAt($i) . "\n";
            $i = $i + 1;
        }

        $alreadySavedParts = 1;
    }

}

// Load the MIME into an Email object.  This unwraps the security layers and verifies signatures.
$email = new COM("Chilkat.Email");
$email->SetFromMimeSb($sbMime);

if ($email->ReceivedSigned == 1) {

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

    // Check to see if the signatures were verified.
    if ($email->SignaturesValid == 1) {
        print 'Digital signature(s) verified.' . "\n";

        print 'Signer: ' . $email->SignedBy . "\n";

        // The certificate used for signing may be obtained
        // by calling email.GetSignedByCert.
        $cert = new COM("Chilkat.Cert");
        $success = $email->LastSignerCert($i,$cert);
        if ($success == 0) {
            print 'Failed to get signing certificate object.' . "\n";
        }
        else {
            print 'Signing cert: ' . $cert->SubjectCN . "\n";
        }

    }

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

if ($alreadySavedParts != 1) {
    $email->SaveAllAttachments('c:/temp/qa_output');
}


?>