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<?php
session_start();
function encrypt($str) {
$kunci = '979a218e0632df2935317f98d47956c7';
for ($i = 0; $i < strlen($str); $i++) {
$karakter = substr($str, $i, 1);
$kuncikarakter = substr($kunci, ($i % strlen($kunci))-1, 1);
$karakter = chr(ord($karakter)+ord($kuncikarakter));
$hasil .= $karakter;
}
return urlencode(base64_encode($hasil));
}
function decrypt($str) {
$str = base64_decode(urldecode($str));
$hasil = '';
$kunci = '979a218e0632df2935317f98d47956c7';
for ($i = 0; $i < strlen($str); $i++) {
$karakter = substr($str, $i, 1);
$kuncikarakter = substr($kunci, ($i % strlen($kunci))-1, 1);
$karakter = chr(ord($karakter)-ord($kuncikarakter));
$hasil .= $karakter;
}
return $hasil;
}
function login_validate() {
$timeout = 30;
$_SESSION['expires_by'] = time() + $timeout;
}
function login_check() {
$exp_time = $_SESSION['expires_by'];
if (time() < $exp_time) {
login_validate();
return true;
} else {
unset($_SESSION['expires_by']);
return false;
}
}
?>