OPENSSL problem

Hi, I'm stuck for serveral days now on the following problem : whatever I try, i can't get the openssl_seal function to work. Even the sample code in the documentation doesn't work. I precise that the .dll is well loaded, I don't get any error while trying to call the functions of the openssl lib. I use PHP 4.0.4 on a NT4 server, with IIS. I also tried PHP 4.0.4 on a WIN2K server with IIS and Apache. Same result. I use the following code : ---------------------------------- $data="test data"; $fp = fopen("test.cer", "r"); $cert = fread($fp, 8192); fclose($fp); $k = openssl_get_publickey($cert); openssl_seal($data, $sealed, $ekeys, array($k)); openssl_free_key($k); echo $sealed; ----------------------------------- $k returns a correct id BUT $sealed and $ekeys remains ALWAYS blank/false, as if the seal function didn't work at all. I used certs generated by openssl.exe on NT, with bit depth for RSA encoding of 384, 512, and 1024, the result is the same. $sealed is always blank. I precise that with the same certs/private keys couples, the functions openssl_sign & verify are working perfectly. So anyone has an idea of the problem ? Thanks for your help, eXXos.