* 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
- * automatically.
+ * automatically. The `return_public_key' and `return_private_key' may
+ * be NULL.
*
* The `passphrase' is the passphrase that is used to encrypt the
* private key file. It is recommended that you would protect your