/**
* Crypts data using mcrypt or userland if not available.
*
* @param string data
* @param string secret key
* @param bool true if it should be crypted,
* false if it should be decrypted
* @return string (de-)crypted data
*
* @access public
*/
function cryptRC4($data, $secret, $crypt = true)
{
if (function_exists('mcrypt_module_open')) {
$td = mcrypt_module_open('tripledes', '', 'ecb', '');
$iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
mcrypt_generic_init($td, $secret, $iv);
if ($crypt) {
$data = mcrypt_generic($td, $data);
} else {
$data = mdecrypt_generic($td, $data);
}
mcrypt_generic_deinit($td);
mcrypt_module_close($td);
} else {
$rc4 =& LiveUser::cryptRC4Factory($secret);
if (!$rc4) {
$this->stack->push(LIVEUSER_ERROR_CONFIG, 'exception', array(), 'RememberMe feature requires either the mcrypt extension or PEAR::Crypt_RC4');
return false;
}
if ($crypt) {
$rc4->crypt($data);
} else {
$rc4->decrypt($data);
}
}
return $data;
}