- it技术
- PHP RC4算法
public function encrypRc4($encryptKey, $str)
{
$cipher = '';
$key[] = "";
$box[] = "";
$pwd_length = strlen($encryptKey);
$data_length = strlen($str);
for ($i = 0; $i < 256; $i++) {
$key[$i] = ord($encryptKey[$i % $pwd_length]);
$box[$i] = $i;
}
for ($j = $i = 0; $i < 256; $i++) {
$j = ($j + $box[$i] + $key[$i]) % 256;
$tmp = $box[$i];
$box[$i] = $box[$j];
$box[$j] = $tmp;
}
for ($a = $j = $i = 0; $i < $data_length; $i++) {
$a = ($a + 1) % 256;
$j = ($j + $box[$a]) % 256;
$tmp = $box[$a];
$box[$a] = $box[$j];
$box[$j] = $tmp;
$k = $box[(($box[$a] + $box[$j]) % 256)];
$cipher .= dechex(ord($str[$i]) ^ $k);
}
return $cipher;
}
