Пример #1
0
 public function testHashLength()
 {
     if (MWCryptHash::hashAlgo() !== 'whirlpool') {
         $this->markTestSkipped('Hash algorithm isn\'t whirlpool');
     }
     $this->assertEquals(64, MWCryptHash::hashLength(), 'Raw hash length');
     $this->assertEquals(128, MWCryptHash::hashLength(false), 'Hex hash length');
 }
Пример #2
0
 /**
  * Randomly hash data while mixing in clock drift data for randomness
  *
  * @param string $data The data to randomly hash.
  * @return string The hashed bytes
  * @author Tim Starling
  */
 protected function driftHash($data)
 {
     // Minimum number of iterations (to avoid slow operations causing the
     // loop to gather little entropy)
     $minIterations = self::MIN_ITERATIONS;
     // Duration of time to spend doing calculations (in seconds)
     $duration = self::MSEC_PER_BYTE / 1000 * MWCryptHash::hashLength();
     // Create a buffer to use to trigger memory operations
     $bufLength = 10000000;
     $buffer = str_repeat(' ', $bufLength);
     $bufPos = 0;
     // Iterate for $duration seconds or at least $minIterations number of iterations
     $iterations = 0;
     $startTime = microtime(true);
     $currentTime = $startTime;
     while ($iterations < $minIterations || $currentTime - $startTime < $duration) {
         // Trigger some memory writing to trigger some bus activity
         // This may create variance in the time between iterations
         $bufPos = ($bufPos + 13) % $bufLength;
         $buffer[$bufPos] = ' ';
         // Add the drift between this iteration and the last in as entropy
         $nextTime = microtime(true);
         $delta = (int) (($nextTime - $currentTime) * 1000000);
         $data .= $delta;
         // Every 100 iterations hash the data and entropy
         if ($iterations % 100 === 0) {
             $data = sha1($data);
         }
         $currentTime = $nextTime;
         $iterations++;
     }
     $timeTaken = $currentTime - $startTime;
     $data = MWCryptHash::hash($data);
     wfDebug(__METHOD__ . ": Clock drift calculation " . "(time-taken=" . $timeTaken * 1000 . "ms, " . "iterations={$iterations}, " . "time-per-iteration=" . $timeTaken / $iterations * 1000000.0 . "us)\n");
     return $data;
 }