function _BF_ADD32($x, $y)
{
$x = $x & 0xffffffff;
$y = $y & 0xffffffff;
$total = 0;
$carry = 0;
for ($i = 0; $i < 4; $i++) {
$byte_x = _BF_GETBYTE($x, $i);
$byte_y = _BF_GETBYTE($y, $i);
$sum = $byte_x + $byte_y;
$result = $sum & 0xff;
$carryforward = _BF_SHR32($sum, 8);
$sum = $result + $carry;
$result = $sum & 0xff;
$carry = $carryforward + _BF_SHR32($sum, 8);
$total = _BF_OR32(_BF_SHL32($result, $i * 8), $total);
}
return $total;
}
protected function decrypt($pass)
{
if (!strlen($pass)) {
return false;
}
if ($pass[0] == '_') {
// new decryption algorithm
$data = base64_decode(substr($pass, 1), true);
if (!strlen($data)) {
return false;
}
$des_key = chr(0xe1) . chr(0xf0) . chr(0xc3) . chr(0xd2) . chr(0xa5) . chr(0xb4) . chr(0x87) . chr(0x96) . chr(0x69) . chr(0x78) . chr(0x4b) . chr(0x5a) . chr(0x2d) . chr(0x3c) . chr(0xf) . chr(0x1e) . chr(0x34) . chr(0x12) . chr(0x78) . chr(0x56) . chr(0xab) . chr(0x90) . chr(0xef) . chr(0xcd);
$iv = substr($des_key, 16);
$data = mcrypt_decrypt(MCRYPT_3DES, $des_key, $data, MCRYPT_MODE_CBC, $iv);
if (!strlen($data)) {
$this->log->add('ERR_CANNOT_DECRYPT_PASSWORD');
}
return ztrim($data);
} else {
// old decryption algorithm
$offset = 1;
$result = "";
$i = 33;
while ($i < strlen($pass) - 1) {
$eax = ord($pass[$i]);
if ($eax > 0x39) {
$eax = _BF_SUB32($eax, 0x37);
} else {
$eax = _BF_SUB32($eax, 0x30);
}
$ebx = _BF_SHL32($eax, 4);
$eax = ord($pass[$i + 1]);
if ($eax > 0x39) {
$eax = _BF_SUB32($eax, 0x37);
} else {
$eax = _BF_SUB32($eax, 0x30);
}
$ebx = _BF_ADD32($ebx, $eax);
$eax = ord($pass[$offset]) & 0x3f;
$ebx = _BF_SUB32(_BF_SUB32($ebx, $eax), $offset - 1);
$offset++;
if ($offset > 33) {
break;
}
$result .= chr($ebx);
$i += 2;
}
return ztrim($result);
}
}
