Sulu\Component\Security\Authentication\SaltGenerator::getRandomSalt PHP Method

    public function getRandomSalt()
    {
        $generator = new SecureRandom();
        return base64_encode($generator->nextBytes(32));
    }

 /**
  * Generates a random salt for the password.
  *
  * @return string
  */
 private function generateSalt()
 {
     return $this->saltGenerator->getRandomSalt();
 }