def setPin(self, old_pin, new_pin):
        """
        C_SetPIN

        :param old_pin: old PIN
        :param new_pin: new PIN
        """
        old_pin1 = ckbytelist(old_pin)
        new_pin1 = ckbytelist(new_pin)
        rv = self.lib.C_SetPIN(self.session, old_pin1, new_pin1)
        if rv != CKR_OK:
            raise PyKCS11Error(rv)
C_SetPIN

        :param old_pin: old PIN
        :param new_pin: new PIN