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    Hi Yu Xue,<br>
    <br>
    <blockquote
      cite="mid:AANLkTikZ8K0EcsV2A7DKSCR_OMrQvxB9x-oaqY63uQdE@mail.gmail.com"
      type="cite">I wrote a short informal test program. It looks that
      our results are agreed.</blockquote>
    <br>
    Good!<br>
    <br>
    <blockquote
      cite="mid:AANLkTikZ8K0EcsV2A7DKSCR_OMrQvxB9x-oaqY63uQdE@mail.gmail.com"
      type="cite">
      <div class="gmail_quote">
        <blockquote class="gmail_quote" style="padding-left: 1ex;
          margin: 0px 0px 0px 0.8ex; border-left: 1px solid rgb(204,
          204, 204);">beyond the test vectors given in the RFC, maybe by
          utilizing the concept<br>
          proposed by Niels Ferguson for testing AES:<br>
          <a moz-do-not-send="true"
href="http://blogs.msdn.com/b/si_team/archive/2006/05/19/aes-test-vectors.aspx"
            target="_blank">http://blogs.msdn.com/b/si_team/archive/2006/05/19/aes-test-vectors.aspx</a><br>
        </blockquote>
      </div>
    </blockquote>
    <br>
    The values you used were the offical test vectors, but looking at
    the test coverage of my implementation[0], I think we don't really
    need more as pretty much everything is already covered by the unit
    test.<br>
    <br>
    <br>
    Best,<br>
    <br>
    Nils<br>
    <br>
    <br>
    [0] <a
      href="https://gnunet.org/coverage/src/util/crypto_hkdf.c.gcov.html">https://gnunet.org/coverage/src/util/crypto_hkdf.c.gcov.html</a>
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