tional, max 255 bytes.</p></dd><dt class="param">metadata</dt><dd class="cmt"><p>arbitrary user-defined machine-readable data of this SSH Certificate Authority. optional, max 4096 bytes.</p></dd><dt class="param">privateKeyType</dt><dd class="cmt"><p>the type of private key to generate. one of <code>rsa</code>, <code>ecdsa</code>, <code>ed25519</code></p></dd><dt class="param">ellipticCurve</dt><dd class="cmt"><p>the type of elliptic curve to use when creating an ECDSA key</p></dd><dt class="param">keySize<