--- /dev/null
+<?php
+/**
+ * A standard random number generator
+ *
+ * @author Roland Haeder <webmaster@ship-simu.org>
+ * @version 0.3.0
+ * @copyright Copyright(c) 2007, 2008 Roland Haeder, this is free software
+ * @license GNU GPL 3.0 or any newer version
+ * @link http://www.mxchange.org
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+class RandomNumberGenerator extends BaseFrameworkSystem {
+ /**
+ * Prime number for better pseudo random numbers
+ */
+ private $prime = 0;
+
+ /**
+ * Add this calculated number to the rng
+ */
+ private $extraNumber = 0;
+
+ /**
+ * Extra salt for secured hashing
+ */
+ private $extraSalt = "";
+
+ /**
+ * Maximum length for random string
+ */
+ private $rndStrLen = 0;
+
+ /**
+ * Protected constructor
+ *
+ * @param $className Name of this class
+ * @return void
+ */
+ protected function __construct ($className = __CLASS__) {
+ // Call parent constructor
+ parent::__construct($className);
+
+ // Set part description
+ $this->setObjectDescription("Standard random number generator");
+
+ // Create unique ID number
+ $this->generateUniqueId();
+
+ // Clean up a little
+ $this->removeNumberFormaters();
+ $this->removeSystemArray();
+ }
+
+ /**
+ * Creates an instance of this class
+ *
+ * @return $rngInstance An instance of this random number generator
+ */
+ public final static function createRandomNumberGenerator () {
+ // Get a new instance
+ $rngInstance = new RandomNumberGenerator();
+
+ // Initialize the RNG now
+ $rngInstance->initRng();
+
+ // Return the instance
+ return $rngInstance;
+ }
+
+ /**
+ * Initializes the random number generator
+ *
+ * @return void
+ */
+ protected function initRng () {
+ // Seed mt_rand()
+ mt_srand((double) microtime() * 1000000);
+
+ // Get the prime number from config
+ $this->prime = $this->getConfigInstance()->readConfig('math_prime');
+
+ // Calculate the extra number which is always the same unless you give
+ // a better prime number
+ $this->extraNumber = ($this->prime * $this->prime / (pi() ^ 2));
+
+ // Set the server IP to cluster
+ $serverIp = "cluster";
+ // Do we have a single server?
+ if ($this->getConfigInstance()->readConfig('is_single_server') == "Y") {
+ // Then use that IP for extra security
+ $serverIp = getenv('SERVER_ADDR');
+ }
+
+ // One-way data we need for "extra-salting" the random number
+ // @TODO Add site for stronger salt!
+ $this->extraSalt = sha1($serverIp . ":" . getenv('SERVER_SOFTWARE') . ":" . $this->getConfigInstance()->readConfig('date_key') . ":" . serialize($this->getDatabaseInstance()->getConnectionData()));
+
+ // Get config entry for max salt length
+ $this->rndStrLen = $this->getConfigInstance()->readConfig('rnd_str_length');
+ }
+
+ /**
+ * Makes a pseudo-random string useable for salts
+ *
+ * @param $length Length of the string, default: 128
+ * @return $randomString The pseudo-random string
+ */
+ public function makeRandomString ($length = -1) {
+ // Is the number <1, then fix it to default length
+ if ($length < 1) $length = $this->rndStrLen;
+
+ // Initialize the string
+ $randomString = "";
+
+ // And generate it
+ for ($idx = 0; $idx < $length; $idx++) {
+ // Add a random character and add it to our string
+ $randomString .= chr($this->randomNumnber(0, 255));
+ }
+
+ // Return the random string mixed up
+ return str_shuffle($randomString);
+ }
+
+ /**
+ * Generate a pseudo-random integer number in a given range
+ *
+ * @param $min Min value to generate
+ * @param $max Max value to generate
+ * @return $num Pseudo-random number
+ */
+ public function randomNumnber ($min, $max) {
+ // @TODO I had a better random number generator here
+ return mt_rand($min, $max);
+ }
+
+ /**
+ * Getter for extra salt
+ *
+ * @return $extraSalt
+ */
+ public final function getExtraSalt () {
+ return $this->extraSalt;
+ }
+}
+
+// [EOF]
+?>