I have the following encryption function:
function RC4( $data) { //ecncrypt $data with the key in $keyfile with an rc4
algorithm
$pwd = implode('', file(/key.php'));
$pwd_length = strlen($pwd);
for ($i = 0; $i < 255; $i++) {
$key[$i] = ord(substr($pwd, ($i % $pwd_length)+1, 1));
$counter[$i] = $i;
}
for ($i = 0; $i < 255; $i++) {
$x = ($x + $counter[$i] + $key[$i]) % 256;
$temp_swap = $counter[$i];
$counter[$i] = $counter[$x];
$counter[$x] = $temp_swap;
}
for ($i = 0; $i < strlen($data); $i++) {
$a = ($a + 1) % 256;
$j = ($j + $counter[$a]) % 256;
$temp = $counter[$a];
$counter[$a] = $counter[$j];
$counter[$j] = $temp;
$k = $counter[(($counter[$a] + $counter[$j]) % 256)];
$Zcipher = ord(substr($data, $i, 1)) ^ $k;
$Zcrypt .= chr($Zcipher);
}
return $Zcrypt;
}
source: zend code gallery
When I encrypt a string that ends in e it shows up as a space in the
database, when I pull it back out of the database, the string is missing the
e. I tried converting the field in the database to a blob and that didn't
work either. My next idea is to add a bin2hex and then a hex2bin:
function hex2bin($hexdata) {
$bindata="";
for ($i=0;$i<strlen($hexdata);$i+=2) {
$bindata.=chr(hexdec(substr($hexdata,$i,2)));
}
return $bindata;
}
source: phil at internetprojectmanagers dot com
I was hoping to get some feedback if this is a good way to go about this.
Thanks, Mark
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