algorithm parameter file, created with <code>openssl genpkey -genparam</code> or an X.509 certificate for a key with appropriate algorithm.</p>

<p><b>param:</b><i>file</i> generates a key using the parameter file or certificate <i>file</i>, the algorithm is determined by the parameters.</p>

<p><i>algname</i>[:<i>file</i>] generates a key using the given algorithm <i>algname</i>. If a parameter file <i>file</i> is given then the parameters specified there are used, where the algorithm parameters must match