title: Convert RSA to OPENSSH
body: <p>I will preface this that I am extremely inexperienced with certs/keys and I am using a Mac.</p>
  <p>My problem is with RSA and OPENSSH certs/keys. I currently have a valid RSA cert/key, but I need to convert them to OpenSSH. From my understanding, I want to do the opposite of this thread: <a href="https://stackoverflow.com/questions/54994641/openssh-private-key-to-rsa-private-key">Openssh Private Key to RSA Private Key</a></p>
  <p>I have a file that starts with:</p>
  <pre><code>-----BEGIN RSA PRIVATE KEY-----
  </code></pre>
  <p>But I need to convert it to this:</p>
  <pre><code>-----BEGIN OPENSSH PRIVATE KEY-----
  </code></pre>
  <p>I have tried <code>ssh-keygen -p -N &quot;&quot; -m pem -f /path/to/key</code> and <code>ssh-keygen -f /path/to/key -m pem</code> but it does not output with the <code>OPENSSH</code> header I expected.</p>
  <ol>
  <li>Is this possible?</li>
  <li>If it is possible, what can I use to perform this conversion and what would a potential command be?</li>
  <li>Do I need to do anything to convert the cert if I converted the key?</li>
  <li>If I do need to convert the cert, what is the command for that?</li>
  <li>If there is any further explanation on what converting from RSA to OPENSSH is, I would really appreciate it.</li>
  </ol>