Xxtea.class.php
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<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
// +----------------------------------------------------------------------
// | Copyright (c) 2009 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------
namespace Think\Crypt\Driver;
// Xxtea 加密实现类
class Xxtea
{
/**
* 加密字符串
*
* @param string $str
* 字符串
* @param string $key
* 加密key
* @param integer $expire
* 有效期（秒）
* @return string
*/
public static function encrypt($str, $key, $expire = 0)
{
$expire = sprintf('%010d', $expire ? $expire + time() : 0);
$str = $expire . $str;
$v = self::str2long($str, true);
$k = self::str2long($key, false);
$n = count($v) - 1;
$z = $v[$n];
$y = $v[0];
$delta = 0x9E3779B9;
$q = floor(6 + 52 / ($n + 1));
$sum = 0;
while (0 < $q --) {
$sum = self::int32($sum + $delta);
$e = $sum >> 2 & 3;
for ($p = 0; $p < $n; $p ++) {
$y = $v[$p + 1];
$mx = self::int32((($z >> 5 & 0x07ffffff) ^ $y << 2) + (($y >> 3 & 0x1fffffff) ^ $z << 4)) ^ self::int32(($sum ^ $y) + ($k[$p & 3 ^ $e] ^ $z));
$z = $v[$p] = self::int32($v[$p] + $mx);
}
$y = $v[0];
$mx = self::int32((($z >> 5 & 0x07ffffff) ^ $y << 2) + (($y >> 3 & 0x1fffffff) ^ $z << 4)) ^ self::int32(($sum ^ $y) + ($k[$p & 3 ^ $e] ^ $z));
$z = $v[$n] = self::int32($v[$n] + $mx);
}
return self::long2str($v, false);
}
/**
* 解密字符串
*
* @param string $str
* 字符串
* @param string $key
* 加密key
* @return string
*/
public static function decrypt($str, $key)
{
$v = self::str2long($str, false);
$k = self::str2long($key, false);
$n = count($v) - 1;
$z = $v[$n];
$y = $v[0];
$delta = 0x9E3779B9;
$q = floor(6 + 52 / ($n + 1));
$sum = self::int32($q * $delta);
while ($sum != 0) {
$e = $sum >> 2 & 3;
for ($p = $n; $p > 0; $p --) {
$z = $v[$p - 1];
$mx = self::int32((($z >> 5 & 0x07ffffff) ^ $y << 2) + (($y >> 3 & 0x1fffffff) ^ $z << 4)) ^ self::int32(($sum ^ $y) + ($k[$p & 3 ^ $e] ^ $z));
$y = $v[$p] = self::int32($v[$p] - $mx);
}
$z = $v[$n];
$mx = self::int32((($z >> 5 & 0x07ffffff) ^ $y << 2) + (($y >> 3 & 0x1fffffff) ^ $z << 4)) ^ self::int32(($sum ^ $y) + ($k[$p & 3 ^ $e] ^ $z));
$y = $v[0] = self::int32($v[0] - $mx);
$sum = self::int32($sum - $delta);
}
$data = self::long2str($v, true);
$expire = substr($data, 0, 10);
if ($expire > 0 && $expire < time()) {
return '';
}
$data = substr($data, 10);
return $data;
}
private static function long2str($v, $w)
{
$len = count($v);
$s = array();
for ($i = 0; $i < $len; $i ++) {
$s[$i] = pack("V", $v[$i]);
}
if ($w) {
return substr(join('', $s), 0, $v[$len - 1]);
} else {
return join('', $s);
}
}
private static function str2long($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 $v;
}
private static function int32($n)
{
while ($n >= 2147483648) {
$n -= 4294967296;
}
while ($n <= - 2147483649) {
$n += 4294967296;
}
return (int) $n;
}
}