static function ExtractDataPacket($data, $key, $options = array())
{
$data = (string) $data;
if (isset($options["key2"])) {
$options2 = $options;
if (isset($options["iv2"])) {
$options["iv"] = $options["iv2"];
} else {
unset($options["iv"]);
}
if (self::IsMcryptAvailable()) {
$data = self::McryptDecrypt($data, $options["key2"], $options);
} else {
if (!isset($options["bits2"])) {
$options["bits2"] = strlen($options["key2"]) * 8;
}
if ($options["mode"] == "CBC" && !isset($options["iv"])) {
$options["iv"] = "";
}
$bf = new SSO_Blowfish();
if ($options["mode"] == "CBC") {
$bf->SetBlockMode("CBC");
$bf->SetInitVector($options["iv"]);
}
$bf->SetKey($options["key2"], $options["bits2"]);
$bf->AddData($data);
$bf->Finalize();
$data = $bf->Decrypt();
}
$data = substr($data, 1) . substr($data, 0, 1);
$options = $options2;
}
if (self::IsMcryptAvailable()) {
$data = self::McryptDecrypt($data, $key, $options);
} else {
if (!isset($options["bits"])) {
$options["bits"] = strlen($key) * 8;
}
if (!isset($options["mode"])) {
$options["mode"] = "ECB";
}
if ($options["mode"] == "CBC" && !isset($options["iv"])) {
$options["iv"] = "";
}
$bf = new SSO_Blowfish();
if ($options["mode"] == "CBC") {
$bf->SetBlockMode("CBC");
$bf->SetInitVector($options["iv"]);
}
$bf->SetKey($key, $options["bits"]);
$bf->AddData($data);
$bf->Finalize();
$data = $bf->Decrypt();
}
if ($data === false) {
return false;
}
$pos = strpos($data, "\n");
if ($pos === false) {
return false;
}
$data = substr($data, $pos + 1);
$pos = strpos($data, "\n");
if ($pos === false) {
return false;
}
$check = substr($data, 0, $pos);
$data = substr($data, $pos + 1);
$pos = strrpos($data, "\n");
if ($pos === false) {
return false;
}
$data = substr($data, 0, $pos);
if (!isset($options["lightweight"]) || !$options["lightweight"]) {
if ($check !== strtolower(sha1($data))) {
return false;
}
} else {
if ($check !== strtolower(dechex(crc32($data)))) {
return false;
}
}
return $data;
}
