Created key must always be looked for as it is not assigned to the
passed in null key.
Delete local context and loopback passphrase provider.
Parameter expires was ignored in CreateKeyWithEngineDefaultAlgo.
In-place editing with a popup if user is allowed in app config file.
User must of course manage at least a private key. User identities of
target key may be selectively chosen. Optionally, certification may be
exportable and non-revocable.