* and `prv_filename' is the public key and private key filenames.
* The `pub_identifier' is the public key identifier (for example:
* "UN=foobar, HN=hostname"), or if NULL the routine generates it
* and `prv_filename' is the public key and private key filenames.
* The `pub_identifier' is the public key identifier (for example:
* "UN=foobar, HN=hostname"), or if NULL the routine generates it