$di->set('crypt', function(){

    $crypt = new \Phalcon\Crypt();

    return $crypt;

}, true);

或者：

$di['crypt'] = function(){

   $crypt=new \Phalcon\Crypt();

   return $crypt;

};

关于调用：

$this->crypt;

或者

$this->di['crypt'];

或者

$this->di->crypt;

        $key = "le password";

        $password = "this is a secret text";

            //加密

            $crypt = new \Phalcon\Crypt();

            $encrypted = $crypt->encrypt($password, $key);

            echo $encrypted;

            //解密

            $crypt = new \Phalcon\Crypt();

            $encrypted = $crypt->encrypt($password, $key);

            //

            $password = $crypt->decrypt($encrypted, $key);

            echo $password;

      $crypt = new \Phalcon\Crypt();

       // $crypt->setCipher('blowfish');

        $key = "le password";

        $password = "this is a sicret text";

        //加密

        $encrypted = $crypt->encryptBase64($password, $key);

        echo $encrypted;

        echo "<br>";

       //解密

        $password = $crypt->decryptBase64($encrypted, $key);

        echo $password;