Digital Email Signing

Add an option for digital email signing. I manually coded it for our site so emails the board sends out are signed. It helps us stay out of the spam folder and it was easy to implement.

I did it like this:
// Send message ...
$mail_to = ($to == '') ? 'undisclosed-recipients:;' : $to;
$err_msg = '';
//----added for signing ATE 2017--------------
$fp = fopen("/var/www/ssl/ext/phpbbservices/digests/includes/msg.txt", "w"); 
$this->msg = "".'Content-Type: text/html; charset="iso-8859-1" 
Content-Transfer-Encoding: 8bit'. "\n\n" .  $this->msg . "\n";
fwrite($fp, $this->msg); 
fclose($fp);
 
openssl_pkcs7_sign("/var/www/ssl/ext/phpbbservices/digests/includes/msg.txt", "/var/www/ssl/ext/phpbbservices/digests/includes/signed.txt", file_get_contents("/var/www/ssl/ext/phpbbservices/digests/includes/publicCert.pem"), array(file_get_contents("/var/www/ssl/ext/phpbbservices/digests/includes/privateKey.pem"), 'PASSWORD_FOR_PRIVATE_KEY'), $headers); 
$data = file_get_contents("/var/www/ssl/ext/phpbbservices/digests/includes/signed.txt"); 
$parts = explode("\n\n", $data, 2);
$newHeader = explode("\n", $parts[0]);
 
$newMessage =  $parts[1];
//-------end od signing changes --------------------------
if ($config['smtp_delivery'])

{ $result = smtpmail($this->addresses, mail_encode($this->subject), wordwrap(utf8_wordwrap($this->msg), 997, "\n", true), $err_msg, $headers); }

else

{   //$result = phpbb_mail($mail_to, $this->subject, $this->msg, $headers, PHP_EOL, $err_msg); $result = phpbb_mail($mail_to, $this->subject, $newMessage, $newHeader, PHP_EOL, $err_msg);   }

 
if (!$result)

{ $this->error('EMAIL', $err_msg); return false; }

 
return true;
}
 
}