function link_region($method_name, $params, $user_data)
{
log_message('info', "link_region called");
$config =& get_config();
$req = $params[0];
if (isset($req['region_name']) && strlen($req['region_name']) > 0) {
$region_name = $req['region_name'];
log_message('debug', "Using specified region name {$region_name}");
} else {
$region_name = $config['hypergrid_default_region'];
log_message('debug', "No region name specified - using {$region_name}");
}
$scene = lookup_scene_by_name($region_name);
$response = array();
if ($scene == null) {
log_message('warn', "Unable to link to unknown region {$region_name} - no scene found");
$response['result'] = 'false';
} else {
$response['result'] = 'true';
$response['uuid'] = $scene->SceneID;
// Yay for 64-bit integer bitmath in PHP
$x = $scene->MinPosition->X;
$y = $scene->MinPosition->Y;
$handle = bitShift($x, 32);
$handle = bitOr($handle, (string) $y, 0);
$response['handle'] = (string) $handle;
$response['region_image'] = "http://" . $scene->ExtraData['ExternalAddress'] . ":" . ($response['server_uri'] = $scene->Address);
$response['external_name'] = $scene->Name;
log_message('debug', "Succesfully linked to {$region_name}@" . $scene->Address);
}
return $response;
}
function rsa_decrypt($enc_data, $p, $q, $d)
{
$enc_data = int2bin($enc_data);
$exp = $d;
$modulus = bcmul($p, $q);
$data_len = strlen($enc_data);
$chunk_len = bitLen($modulus) - 1;
$block_len = (int) ceil($chunk_len / 8);
$curr_pos = 0;
$bit_pos = 0;
$plain_data = 0;
while ($curr_pos < $data_len) {
$tmp = bin2int(substr($enc_data, $curr_pos, $block_len));
$tmp = bcpowmod($tmp, $exp, $modulus);
$plain_data = bitOr($plain_data, $tmp, $bit_pos);
$bit_pos += $chunk_len;
$curr_pos += $block_len;
}
return int2bin($plain_data);
}
