(Perl) IMAP Download and Verify Signed (S/MIME) Email

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

Chilkat Perl Downloads Perl Module for Windows, MacOS, Linux, Alpine Linux, Solaris

use chilkat();

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

$imap = chilkat::CkImap->new();

# Connect to an IMAP server.
# Use TLS
$imap->put_Ssl(1);
$imap->put_Port(993);
$success = $imap->Connect("imap.someMailServer.com");
if ($success != 1) {
    print $imap->lastErrorText() . "\r\n";
    exit;
}

$success = $imap->Login("myLogin","myPassword");
if ($success != 1) {
    print $imap->lastErrorText() . "\r\n";
    exit;
}

# Select an IMAP mailbox
$success = $imap->SelectMailbox("Inbox");
if ($success != 1) {
    print $imap->lastErrorText() . "\r\n";
    exit;
}

# We can choose to fetch UIDs or sequence numbers.
$fetchUids = 1;

# Get the message IDs of all the emails in the mailbox
# messageSet is a MessageSet
$messageSet = $imap->Search("ALL",$fetchUids);
if ($imap->get_LastMethodSuccess() != 1) {
    print $imap->lastErrorText() . "\r\n";
    exit;
}

# Scan for emails with attachments, and save the attachments
# to a sub-directory.
$i = 0;
while ($i < $messageSet->get_Count()) {

    $uid = $messageSet->GetId($i);
    print "uid: " . $uid . "\r\n";

    # email is a Email
    $email = $imap->FetchSingle($uid,1);

    # 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() == 1) {

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

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

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

            # The certificate used for signing may be obtained
            # by calling email.GetSignedByCert.
            # cert is a Cert
            $cert = $email->GetSignedByCert();
            if ($email->get_LastMethodSuccess() != 1) {
                print "Failed to get signing certificate object." . "\r\n";
            }
            else {
                print "Signing cert: " . $cert->subjectCN() . "\r\n";

            }

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

    }

    $i = $i + 1;
}

# Disconnect from the IMAP server.
$success = $imap->Disconnect();