function valid_padding($key, $enc, $iv) { $plain = decrypt_aes_cbc($key, $enc, $iv); $len = strlen($plain); $pad = ord($plain[$len - 1]); return substr($plain, $len - $pad) == str_repeat(chr($pad), $pad); }
function check_cookie($enc, $key) { return strpos(decrypt_aes_cbc($key, $enc, 'YELLOW SUBMARINE'), ';admin=true;') !== false; }