$m = mcrypt_module_open('rijndael-256', '', 'ofb', '');
/* Extract key and iv. */
$crypt_key = $k;
$m = mcrypt_module_open('rijndael-256', '', 'ofb', '');
/* Extract key and iv. */
$crypt_key = $k;
$iv = jirafeau_crypt_create_iv($hash_key, mcrypt_enc_get_iv_size($m));
/* Init module. */
mcrypt_generic_init($m, $hash_key, $iv);
$iv = jirafeau_crypt_create_iv($hash_key, mcrypt_enc_get_iv_size($m));
/* Init module. */
mcrypt_generic_init($m, $hash_key, $iv);