XOR string in PHP with key

Question

I need to XOR a string/text in PHP the base64 encode it, but something goes wrong:

Answer 1

$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; // Josh

http://ideone.com/NSIe7K

I'm sure you can reverse it and create a function, that "crypts" the data ;-)