public static function encrypt($content, $offset, $key, $times)
{
$tempInt = EncryptUtil::bytesToInteger($content, $offset);
$y = $tempInt[0];
$z = $tempInt[1];
$sum = 0;
$a = $key[0];
$b = $key[1];
$c = $key[2];
$d = $key[3];
$delta = 0x9e3779b9;
for ($i = 0; $i < $times; $i++) {
$sum += $delta;
$y += ($z << 4) + $a ^ $z + $sum ^ ($z >> 5) + $b;
$z += ($y << 4) + $c ^ $y + $sum ^ ($y >> 5) + $d;
}
$tempInt[0] = $y;
$tempInt[1] = $z;
return EncryptUtil::integerToBytes($tempInt, 0);
}
