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144.98 ms | 1399 KiB | 7 Q<?php
class xxtea {
public function __construct($options) {
parent::__construct($options);
}
public function encrypt($key, $salt = null) {
if (is_null($salt)) {
$strSalt = $this->salt;
} else {
$strSalt = $salt;
}
return str_replace(array('+', '/', '='), array('-', '_', '.'), base64_encode($this->xxteaEncrypt($key, $strSalt)));
}
public function decrypt($value, $salt = null) {
if (is_null($salt)) {
$strSalt = $this->salt;
} else {
$strSalt = $salt;
}
$strValue = str_replace(array('-', '_', '.'), array('+', '/', '='), $value);
return $this->xxteaDecrypt(base64_decode($strValue), $strSalt);
}
private function long2str($v, $w) {
$len = count($v);
$n = ($len - 1) << 2;
if ($w) {
$m = $v[$len - 1];
if (($m < $n - 3) || ($m > $n))
return false;
$n = $m;
}
$s = array();
for ($i = 0; $i < $len; $i++) {
$s[$i] = pack("V", $v[$i]);
}
if ($w) {
return substr(join('', $s), 0, $n);
} else {
return join('', $s);
}
}
private function str2long($s, $w) {
$v = unpack("V*", $s . str_repeat("\0", (4 - strlen($s) % 4) & 3));
$v = array_values($v);
if ($w) {
$v[count($v)] = strlen($s);
}
return $v;
}
private function int32($n) {
while ($n >= 2147483648)
$n -= 4294967296;
while ($n <= -2147483649)
$n += 4294967296;
return (int) $n;
}
private function xxteaEncrypt($str, $key) {
if ($str == "") {
return "";
}
$v = $this->str2long($str, true);
$k = $this->str2long($key, false);
if (count($k) < 4) {
for ($i = count($k); $i < 4; $i++) {
$k[$i] = 0;
}
}
$n = count($v) - 1;
$z = $v[$n];
$y = $v[0];
$delta = 0x9E3779B9;
$q = floor(6 + 52 / ($n + 1));
$sum = 0;
while (0 < $q--) {
$sum = $this->int32($sum + $delta);
$e = $sum >> 2 & 3;
for ($p = 0; $p < $n; $p++) {
$y = $v[$p + 1];
$mx = $this->int32((($z >> 5 & 0x07ffffff) ^ $y << 2) + (($y >> 3 & 0x1fffffff) ^ $z << 4)) ^ $this->int32(($sum ^ $y) + ($k[$p & 3 ^ $e] ^ $z));
$z = $v[$p] = $this->int32($v[$p] + $mx);
}
$y = $v[0];
$mx = $this->int32((($z >> 5 & 0x07ffffff) ^ $y << 2) + (($y >> 3 & 0x1fffffff) ^ $z << 4)) ^ $this->int32(($sum ^ $y) + ($k[$p & 3 ^ $e] ^ $z));
$z = $v[$n] = $this->int32($v[$n] + $mx);
}
return $this->long2str($v, false);
}
private function xxteaDecrypt($str, $key) {
if ($str == "") {
return "";
}
$v = $this->str2long($str, false);
$k = $this->str2long($key, false);
if (count($k) < 4) {
for ($i = count($k); $i < 4; $i++) {
$k[$i] = 0;
}
}
$n = count($v) - 1;
$z = $v[$n];
$y = $v[0];
$delta = 0x9E3779B9;
$q = floor(6 + 52 / ($n + 1));
$sum = $this->int32($q * $delta);
while ($sum != 0) {
$e = $sum >> 2 & 3;
for ($p = $n; $p > 0; $p--) {
$z = $v[$p - 1];
$mx = $this->int32((($z >> 5 & 0x07ffffff) ^ $y << 2) + (($y >> 3 & 0x1fffffff) ^ $z << 4)) ^ $this->int32(($sum ^ $y) + ($k[$p & 3 ^ $e] ^ $z));
$y = $v[$p] = $this->int32($v[$p] - $mx);
}
$z = $v[$n];
$mx = $this->int32((($z >> 5 & 0x07ffffff) ^ $y << 2) + (($y >> 3 & 0x1fffffff) ^ $z << 4)) ^ $this->int32(($sum ^ $y) + ($k[$p & 3 ^ $e] ^ $z));
$y = $v[0] = $this->int32($v[0] - $mx);
$sum = $this->int32($sum - $delta);
}
return $this->long2str($v, true);
}
}
$xxtea = new xxtea();
$vid = $xxtea->decrypt('xSz5rd55YacQwj-sjO8VbQ..', 'KU_6com-2007web2.0');
var_dump($vid);