igest of this MAC based on the data previously specified in
 <code><a href="../../../reference/javax/crypto/MacSpi.html#engineUpdate(byte)">engineUpdate(byte)</a></code> calls.
 <p>
 This <code>MacSpi</code> instance is reverted to its initial state and
 can be used to start the next MAC computation with the same parameters or
 initialized with different parameters.</p></div>
  <div class="jd-tagdata">
      <h5 class="jd-tagtitle">Returns</h5>
      <ul class="nolist"><li>the generated digest.
</li></ul>
 