title: convert ed25519 private ssh key to RSA private key
body: <p>I'm looking to convert an ed25519 private key to an rsa private key using <code>ssh-keygen</code>.</p>
  <p>I found <a href="https://man.openbsd.org/ssh-keygen" rel="nofollow noreferrer">this helpful guide</a> but I am having trouble figuring out how to specify that the input format is ed25519 and the export format should be rsa.</p>
  <p>I've tried a bunch of different ways trying to match the synopsis and the description of flags, but every time I try, I get &quot;<code>Too many arguments</code>&quot; error from <code>ssh-keygen</code>.</p>
  <p>I'd also like to find the command to generate a public key from a ed25519 private key to verify that it works.</p>