password is required by crypto engine. !!
** Verify must not fail on NODATA premature if auto-key-retrieval failed.
It should not fail silently if it knows there is an error. !!!
-** decrypt-verify sets wrong_key_usage even if not "verify.keyusage" is
- encountered, but "decrypt.keyusage". Is this correct? !!
** All operations: Better error reporting. !!
** Export status handler need much more work. !!!
** Import should return a useful error when one happened.