Daiki Ueno <ueno@unixuser.org> writes:

> Presumably this might be the culprit.  It copies the function
> `netrc-store-data' from netrc.el and most likely the format is different
> from the one used by netrc.el included in XEmacs packages.

Sorry I was missing the point.  Please ignore my guess the above.

After debugging with XEmacs (I could reproduce the problem), now I
suspect that the cause is elsewhere.  Even with or without the above
change, (netrc-parse "~/.authinfo.gpg") always returns nil except the
first time, because the netrc-cache handling is buggy.  netrc saves the
content of the file in a form mangled with base64 and rot13.  However,
XEmacs does not have rot13-string and dgnushack.el defines rot13-string
as a macro:

(defmacro rot13-string (string)
  "Return ROT13 encryption of STRING."
  `(with-temp-buffer
    (insert ,string)
    (translate-region (point-min) (point-max) ,rot13-display-table)
    (buffer-string)))

netrc-parse uses it as to save the contents:

(setq netrc-cache ... (rot13-string (base64-encode-string (buffer-string))))

Guess what will happen.  Since buffer-string is called from the buffer
created by rot13-string, it will always return "".

I'm attaching a patch.