1 ;;; epg-config.el --- configuration of the EasyPG Library
2 ;; Copyright (C) 2006 Daiki Ueno
4 ;; Author: Daiki Ueno <ueno@unixuser.org>
5 ;; Keywords: PGP, GnuPG
7 ;; This file is part of EasyPG.
9 ;; This program is free software; you can redistribute it and/or modify
10 ;; it under the terms of the GNU General Public License as published by
11 ;; the Free Software Foundation; either version 2, or (at your option)
14 ;; This program is distributed in the hope that it will be useful,
15 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
16 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 ;; GNU General Public License for more details.
19 ;; You should have received a copy of the GNU General Public License
20 ;; along with GNU Emacs; see the file COPYING. If not, write to the
21 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
22 ;; Boston, MA 02110-1301, USA.
30 (defcustom epg-gpg-program "gpg"
31 "The `gpg' executable."
35 (defcustom epg-gpgsm-program "gpgsm"
36 "The `gpgsm' executable."
40 (defcustom epg-gpg-home-directory nil
41 "The directory which contains the configuration files of `epg-gpg-program'."
43 :type '(choice (const :tag "Default" nil) directory))
45 (defcustom epg-passphrase-coding-system nil
46 "Coding system to use with messages from `epg-gpg-program'."
50 (defcustom epg-debug nil
51 "If non-nil, debug output goes to the \" *epg-debug*\" buffer.
52 Note that the buffer name starts with a space."
56 (defconst epg-version-number "0.0.9")
58 (defconst epg-gpg-minimum-version "1.4.3")
61 (defun epg-configuration ()
62 "Return a list of internal configuration parameters of `epg-gpg-program'."
63 (let (config groups type args)
65 (apply #'call-process epg-gpg-program nil (list t nil) nil
66 (append (if epg-gpg-home-directory
67 (list "--homedir" epg-gpg-home-directory))
68 '("--with-colons" "--list-config")))
69 (goto-char (point-min))
70 (while (re-search-forward "^cfg:\\([^:]+\\):\\(.*\\)" nil t)
71 (setq type (intern (match-string 1))
72 args (match-string 2))
75 (if (string-match "\\`\\([^:]+\\):" args)
77 (cons (cons (downcase (match-string 1 args))
78 (delete "" (split-string
84 (message "Invalid group configuration: %S" args))))
85 ((memq type '(pubkey cipher digest compress))
86 (if (string-match "\\`\\([0-9]+\\)\\(;[0-9]+\\)*" args)
89 (mapcar #'string-to-number
90 (delete "" (split-string args ";"))))
93 (message "Invalid %S algorithm configuration: %S"
96 (setq config (cons (cons type args) config))))))
98 (cons (cons 'groups groups) config)
101 (defun epg-config--parse-version (string)
104 (while (eq index (string-match "\\([0-9]+\\)\\.?" string index))
105 (setq version (cons (string-to-number (match-string 1 string))
107 index (match-end 0)))
110 (defun epg-config--compare-version (v1 v2)
111 (while (and v1 v2 (= (car v1) (car v2)))
112 (setq v1 (cdr v1) v2 (cdr v2)))
113 (- (or (car v1) 0) (or (car v2) 0)))
116 (defun epg-check-configuration (config &optional minimum-version)
117 "Verify that a sufficient version of GnuPG is installed."
118 (let ((entry (assq 'version config))
121 (stringp (cdr entry)))
122 (error "Undetermined version: %S" entry))
123 (setq version (epg-config--parse-version (cdr entry))
124 minimum-version (epg-config--parse-version
126 epg-gpg-minimum-version)))
127 (unless (>= (epg-config--compare-version version minimum-version) 0)
128 (error "Unsupported version: %s" (cdr entry)))))
131 (defun epg-expand-group (config group)
132 "Look at CONFIG and try to expand GROUP."
133 (let ((entry (assq 'groups config)))
135 (setq entry (assoc (downcase group) (cdr entry))))
138 (provide 'epg-config)
140 ;;; epg-config.el ends here