tect against the fault insertions. </td></tr>
    <tr><td class="paramname">Tot</td><td>is totient, a secret value equal to (p-1)*(q-1). if NULL, calculated internally with p and q. </td></tr>
    <tr><td class="paramname">Len</td><td>is length of the full-length integer in bits. </td></tr>
    <tr><td class="paramname">Res</td><td>is result of exponentiation r = (h^e) mod n.</td></tr>
  </table>
  </dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd><ul>
<li>XST_SUCCESS On success.</li>
<li>XSECURE_R