 the private key to be returned. The corresponding certificate chain for the
 private key is also returned.

 <p>
 If the <i>request</i> object is null, the handler of the callback relies on its own default.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>request</code> - Identifier for the private key, or null.</dd>
</dl>
</li>
</ul>
</li>
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