Security
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<?
/*
TransCrypt Encrytion functions
Description: TransCrypt is an encrytion library. It simply uses look up tables to translate bytes. The look up tables are generated by the LFSR algorithm.
Example:
include("trans_crypt.php");
$secret = "I like encrytion";
$crypted_data = trans_encrypt($secret);
$decrypted_data = trans_decrypt($crypted_data);
echo "secret = $decrypted_data";
*/
function trans_encrypt($data){
for($i = 0, $key = 27, $c = 48; $i <= 255; $i++){
$c = 255 & ($key ^ ($c << 1));
$table[$key] = $c;
$key = 255 & ($key + 1);
}
$len = strlen($data);
for($i = 0; $i < $len; $i++){
$data[$i] = chr($table[ord($data[$i])]);
}
return base64_encode($data);
}
function trans_decrypt($data){
$data = base64_decode($data);
for($i = 0, $key = 27, $c = 48; $i <= 255; $i++){
$c = 255 & ($key ^ ($c << 1));
$table[$c] = $key;
$key = 255 & ($key + 1);
}
$len = strlen($data);
for($i = 0; $i < $len; $i++){
$data[$i] = chr($table[ord($data[$i])]);
}
return $data;
}
?>
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Usage Example
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include("trans_crypt.php");
$secret = "I like encrytion";
$crypted_data = trans_encrypt($secret);
$decrypted_data = trans_decrypt($crypted_data);
echo "secret = $decrypted_data";
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