Studying mcrypt

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Hello Php,

  It's my first time I use mcrypt.
I've done everything like it's written in the php manuals, here is the code:

<?php
$d=mcrypt_module_open("rijndael-256", "", "ofb", "");
$iv=mcrypt_create_iv(mcrypt_enc_get_iv_size($d), MCRYPT_DEV_RANDOM);
$ks=mcrypt_enc_get_key_size($d);
$key=substr(md5("Secret key"), 0, $ks);
mcrypt_generic_init($d, $key, $iv);
$cpass=mcrypt_generic($d, $_POST['opass']);
mcrypt_generic_deinit($d);
mcrypt_module_close($d);
?>

And here's what I get:
Original password: asdfasdfasdf
Encrypted password: Q�j�����*

Question: Is it normal to have such strange characters in the encrypted string?
I'm hosted at http://godaddy.com/, shared hosting, if it does matter.
Thanks!

-- 
With best regards from Ukraine,
Andre
Skype: Francophile
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