tripcode.php

<?php

function event() {
    global $events;

    $args = func_get_args();

    $event = $args[0];

    $args = array_splice($args, 1);

    if (!isset($events[$event]))
        return false;

    foreach ($events[$event] as $callback) {
        if (!is_callable($callback))
            error('Event handler for ' . $event . ' is not callable!');
        if ($error = call_user_func_array($callback, $args))
            return $error;
    }

    return false;
}

function generate_tripcode($name) {
    global $config;

    if ($trip = event('tripcode', $name))
      return $trip;

	if (!preg_match('/^([^#]+)?(###|##|#)(.+)$/', $name, $match))
          return array($name);

	$name = $match[1];
	$secure = $match[2] == '##';
	$secure2 = $match[2] == '###';
	$trip = $match[3];


	// convert to SHIT_JIS encoding
	$trip = mb_convert_encoding($trip, 'Shift_JIS', 'UTF-8');


	// generate salt
	$salt = substr($trip . 'H..', 1, 2);
	$salt = preg_replace('/[^.-z]/', '.', $salt);
	$salt = strtr($salt, ':;<=>?@[\]^_`', 'ABCDEFGabcdef');
	if ($secure) {
          if (isset($config['custom_tripcode']["##{$trip}"])) {
              $trip = $config['custom_tripcode']["##{$trip}"];
          }
          else{
              $trip = '!!' . substr(crypt($trip, str_replace('+', '.', '_..A.' . substr(base64_encode(sha1($trip . $config['secure_trip_salt'], true)), 0, 4))), -10);
          }


	} elseif ($secure2) {
          if (isset($config['custom_tripcode']["###{$trip}"]))
                  $trip = $config['custom_tripcode']["###{$trip}"];
          else
                  $trip = '!!!' . substr(base64_encode(hash('sha256', $trip . $config['secure_trip_salt'])), 0,16);
	} else {
          if (isset($config['custom_tripcode']["#{$trip}"]))
                  $trip = $config['custom_tripcode']["#{$trip}"];
          else
                  $trip = '!' . substr(crypt($trip, $salt), -10);
	}
  return array($name, $trip);
}

print_r(generate_tripcode("##test"));