Functions Php

$message_headers = array('To: p@example.com',
                         'From: b@example.com',
                         'Subject: Summary');
if (openssl_pkcs7_encrypt('espionage_summary.txt', 'espionage_summary.pkcs7',
 file_get_contents('phboss.crt'), $message_headers)) {
  mail('phboss@thingy.exmaple.com',
       'Espionage Summary',
       file_get_contents('espionage_summary.pkcs7'),
       $message_headers);
} else {
  die(openssl_error_string());
}
?>
$cert = file_get_contents('bob.crt');
$pkey = file_get_contents('bob.pem');
if (!openssl_pkcs7_decrypt('new_instructions.pkcs7',
                           'new_instructions.txt',
                           $cert, $pkey)) {
  die(openssl_error_string());
}
? >