- chr: documentation ( source)
- base64_decode: documentation ( source)
- base64_encode: documentation ( source)
- str_split: documentation ( source)
- ord: documentation ( source)
<?php
$mustget = 'Kw4SCQ==';
$key = 'frtkj';
$key_length = strlen($key);
$encoded_data = base64_decode($mustget);
$result = '';
$length = strlen($encoded_data);
for ($i = 0; $i < $length; $i++) {
$tmp = $encoded_data[$i];
for ($j = 0; $j < $key_length; $j++) {
$tmp = chr(ord($tmp) ^ ord($key[$j]));
}
$result .= $tmp;
}
echo $result;
$mustget = 'Kw4SCQ==';
$string = 'Josh';
echo("Must get: " . $mustget . "\n");
echo("We got: " . base64_encode(xor_this($string)) . "\n");
function xor_this($text) {
$key = 'frtkj';
$i = 0;
$encrypted = '';
foreach (str_split($text) as $char) {
$encrypted .= chr(ord($char) ^ ord($key{$i++ % strlen($key)}));
}
return $encrypted;
}