tation of X25519 gives you a key that is not
  fully reduced and has its high bit set, the computation will fail. On the
  other hand, it also means you may use this bit for other purposes (such as
  parity flipping for Ed25519 compatibility).</div>
<table class="foot">
  <tr>
    <td class="foot-date">March 31, 2020</td>
    <td class="foot-os">Linux 4.15.0-46-generic</td>
  </tr>
</table>
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