@Test(timeout=120000)
public void testRandomBytes() throws Exception {

  OsSecureRandom random = getOsSecureRandom();
  // len = 16
  checkRandomBytes(random, 16);
  // len = 32
  checkRandomBytes(random, 32);
  // len = 128
  checkRandomBytes(random, 128);
  // len = 256
  checkRandomBytes(random, 256);
  random.close();
}