>     "keyform", OPT_KEYFORM, 'f', "Private key file format (PEM or ENGINE)"
> 
> while the valid choices seem to be PEM or DER, not PEM or ENGINE:

No, it depends on the command.  Some, for example, expect keys to be stored in 
the ENGINE (presumably an HSM).
The docs are often outdated.  But pem/der is the majority of choices.

The right thing to do is change opt_format to be generic, and specify exactly 
which types of formats are supported.

--  
Principal Security Engineer
Akamai Technologies, Cambridge, MA
IM: rs...@jabber.me; Twitter: RichSalz

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