eturns:</span></dt>
<dd>The Request object which identifies the private key to be returned, or null. If null, the handler of the
 callback relies on its own default.</dd>
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<h4>setKey</h4>
<pre>public&nbsp;void&nbsp;setKey(<a href="https://docs.oracle.com/javase/8/docs/api/java/security/PrivateKey.html?is-external=true" title="class or interface in java.s