openssl_seal

int openssl_seal ( string $data , string &$sealed_data , array &$env_keys , array $pub_key_ids [, string $method = "RC4" [, string &$iv ]] )

<?php
//?$data?is?assumed?to?contain?the?data?to?be?sealed

//?fetch?public?keys?for?our?recipients,?and?ready?them
$fp?=?fopen("/src/openssl-0.9.6/demos/maurice/cert.pem",?"r");
$cert?=?fread($fp,?8192);
fclose($fp);
$pk1?=?openssl_get_publickey($cert);
//?Repeat?for?second?recipient
$fp?=?fopen("/src/openssl-0.9.6/demos/sign/cert.pem",?"r");
$cert?=?fread($fp,?8192);
fclose($fp);
$pk2?=?openssl_get_publickey($cert);

//?seal?message,?only?owners?of?$pk1?and?$pk2?can?decrypt?$sealed?with?keys
//?$ekeys[0]?and?$ekeys[1]?respectively.
openssl_seal($data,?$sealed,?$ekeys,?array($pk1,?$pk2));

//?free?the?keys?from?memory
openssl_free_key($pk1);
openssl_free_key($pk2);
?>