程式碼
複製程式碼 程式碼如下:
/*
* rc4加密演算法
* $pwd 金鑰
* $uncdata 要加密的資料
*/ /$pwd密鑰$data需加密字串
{
$key[] ="";
$box[] ="";
$pwd_length = strlen($pwd);
$data_length = strlen($data) ;
for ($i = 0; $i {
$key[$i] = ord($pwd[$i % $pwd_length]);
$box[$i] = $i ;
}
for ($j = $i = 0; $i {
$j = ($j + $box[$i] + $key[$i]) % 256;
$tmp = $box[$i];
$box[$i] = $box[$j];
$box[$j] = $tmp;
}
for ($a = $j = $i = 0; $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)];
$cipher .= chr(ord($data[$i]) ^ $k);
}
return $cipher;
}