function encrypt($data, $key)
{
$key = md5($key);
$x = 0;
$len = strlen($data);
$l = strlen($key);
for ($i = 0; $i
if ($x == $l) {
$x = 0;
}
$char .= $key{$x};
$x++;
}
for ($i = 0; $i
$str .= chr(ord($data{$i}) + (ord($char{$i})) % 256);
}
return base64_encode($str);
}
function decrypt($data, $key)
{
$key = md5($key);
$x = 0;
$data = base64_decode($data);
$len = strlen($data);
$l = strlen($key);
for ($i = 0; $i
if ($x == $l) {
$x = 0;
}
$char .= substr($key, $x, 1);
$x++;
}
for ($i = 0; $i
if (ord(substr($data, $i, 1))
$str .= chr((ord(substr($data, $i, 1)) + 256) - ord(substr($char, $i, 1)));
} else {
$str .= chr(ord(substr($data, $i, 1)) - ord(substr($char, $i, 1)));
}
}
return $str;
}
$data = 'PHP加密解密算法'; // 被加密信息
$key = '123'; // 密钥
$encrypt = encrypt($data, $key);
$decrypt = decrypt($encrypt, $key);
echo $encrypt, "n", $decrypt;
来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/3026/viewspace-2803246/ ，如需转载，请注明出处，否则将追究法律责任。
