function bcdechex($num)
{
$res = "";
while ($num != '0') {
$byte = bcand($num, 255);
$hex = dechex($byte);
if (strlen($hex) == 1) {
$hex = '0' . $hex;
}
$res = $hex . $res;
$num = bcrightshift($num, 8);
}
if ($res == '') {
$res = 0;
}
return $res;
}
function decryptMessageID($messageID)
{
// saving last information for debug log
$oldmid = $messageID;
$oldkey = $this->enc_key1 >> 16 & 0x7fff;
// calculating the encryption key
$messageID = hexdec($messageID);
$this->enc_key1 = bcand($this->enc_key3 + bcand(bcmul($this->enc_key1, $this->enc_key2), 0xffffffff), 0xffffffff) + 0;
//$this->echo_save("$this->nl ".dechex($this->enc_key1)." ".dechex($this->enc_key2)." ".dechex($this->enc_key3)."\n");
$newkey = $this->enc_key1 >> 16 & 0x7fff;
// xoring the message id
$messageID = ($messageID ^ $newkey) & 0xffff;
$messageID = strtoupper(str_pad(dechex($messageID), 4, "0", STR_PAD_LEFT));
// sting format to allow array lookup
//$this->echo_save("$this->nl Encrypted MID : ".dechex($oldkey).",".dechex($newkey)." $oldmid,$messageID \n");
return $messageID;
}
function hash2location($hash)
{
$value = bchexdec($hash);
$bits128 = $this->bits128;
$location = bcxor(bcrightshift($value, 128), bcand($value, $bits128));
return $this->leftPadHex(bcdechex($location), 32);
}
