Commercial SSH keys vs. OpenSSH keys.

[ewheeler]

To all:

I am trying get a commercial-ssh 2.4.0 to public-key authenticate me from
an OpenSSH OpenSSH_2.5.1p2 private key.  Unfortunatly, the formats are
very different.  How can I either derive a new public key from my OpenSSH
private key that will be compatible w/ the commercial ssh or convert my
OpenSSH poublic key to a format that commercial ssh will work with?

--Eric