1 ;;; epa.el --- the EasyPG Assistant
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.
29 (eval-when-compile (require 'wid-edit))
32 "The EasyPG Assistant"
35 (defcustom epa-armor nil
36 "If non-nil, epa commands create ASCII armored output."
40 (defcustom epa-textmode nil
41 "If non-nil, epa commands treat input files as text."
45 (defcustom epa-popup-info-window t
46 "If non-nil, status information from epa commands is displayed on
51 (defcustom epa-info-window-height 5
52 "Number of lines used to display status information."
56 (defgroup epa-faces nil
60 (defface epa-validity-high-face
61 '((((class color) (background dark))
62 (:foreground "PaleTurquoise" :bold t))
65 "Face used for displaying the high validity."
67 (defvar epa-validity-high-face 'epa-validity-high-face)
69 (defface epa-validity-medium-face
70 '((((class color) (background dark))
71 (:foreground "PaleTurquoise" :italic t))
74 "Face used for displaying the medium validity."
76 (defvar epa-validity-medium-face 'epa-validity-medium-face)
78 (defface epa-validity-low-face
81 "Face used for displaying the low validity."
83 (defvar epa-validity-low-face 'epa-validity-low-face)
85 (defface epa-validity-disabled-face
87 (:italic t :inverse-video t)))
88 "Face used for displaying the disabled validity."
90 (defvar epa-validity-disabled-face 'epa-validity-disabled-face)
92 (defface epa-string-face
95 (:foreground "lightyellow"))
98 (:foreground "blue4"))
101 "Face used for displaying the string."
103 (defvar epa-string-face 'epa-string-face)
105 (defface epa-mark-face
106 '((((class color) (background dark))
107 (:foreground "orange" :bold t))
109 (:foreground "red" :bold t)))
110 "Face used for displaying the high validity."
112 (defvar epa-mark-face 'epa-mark-face)
114 (defface epa-field-name-face
115 '((((class color) (background dark))
116 (:foreground "PaleTurquoise" :bold t))
118 "Face for the name of the attribute field."
120 (defvar epa-field-name-face 'epa-field-name-face)
122 (defface epa-field-body-face
123 '((((class color) (background dark))
124 (:foreground "turquoise" :italic t))
126 "Face for the body of the attribute field."
128 (defvar epa-field-body-face 'epa-field-body-face)
130 (defcustom epa-validity-face-alist
131 '((unknown . epa-validity-disabled-face)
132 (invalid . epa-validity-disabled-face)
133 (disabled . epa-validity-disabled-face)
134 (revoked . epa-validity-disabled-face)
135 (expired . epa-validity-disabled-face)
136 (none . epa-validity-low-face)
137 (undefined . epa-validity-low-face)
138 (never . epa-validity-low-face)
139 (marginal . epa-validity-medium-face)
140 (full . epa-validity-high-face)
141 (ultimate . epa-validity-high-face))
142 "An alist mapping validity values to faces."
146 (defcustom epa-font-lock-keywords
149 ("^\t\\([^\t:]+:\\)[ \t]*\\(.*\\)$"
150 (1 epa-field-name-face)
151 (2 epa-field-body-face)))
152 "Default expressions to addon in epa-mode."
153 :type '(repeat (list string))
156 (defconst epa-pubkey-algorithm-letter-alist
164 (defvar epa-keys-buffer nil)
165 (defvar epa-key-buffer-alist nil)
167 (defvar epa-list-keys-arguments nil)
169 (defvar epa-keys-mode-map
170 (let ((keymap (make-sparse-keymap)))
171 (define-key keymap "m" 'epa-mark)
172 (define-key keymap "u" 'epa-unmark)
173 (define-key keymap "d" 'epa-decrypt-file)
174 (define-key keymap "v" 'epa-verify-file)
175 (define-key keymap "s" 'epa-sign-file)
176 (define-key keymap "S" 'epa-sign-keys)
177 (define-key keymap "e" 'epa-encrypt-file)
178 (define-key keymap "r" 'epa-delete-keys)
179 (define-key keymap "i" 'epa-import-keys)
180 (define-key keymap "o" 'epa-export-keys)
181 (define-key keymap "g" 'epa-list-keys)
182 (define-key keymap "n" 'next-line)
183 (define-key keymap "p" 'previous-line)
184 (define-key keymap " " 'scroll-up)
185 (define-key keymap [delete] 'scroll-down)
186 (define-key keymap "q" 'epa-exit-buffer)
189 (defvar epa-exit-buffer-function #'bury-buffer)
191 (define-widget 'epa-key 'push-button
192 "Button for representing a epg-key object."
194 :button-face-get 'epa-key-widget-button-face-get
195 :value-create 'epa-key-widget-value-create
196 :action 'epa-key-widget-action
197 :help-echo 'epa-key-widget-help-echo)
199 (defun epa-key-widget-action (widget &optional event)
200 (epa-show-key (widget-get widget :value)))
202 (defun epa-key-widget-value-create (widget)
203 (let* ((key (widget-get widget :value))
204 (primary-sub-key (car (epg-key-sub-key-list key)))
205 (primary-user-id (car (epg-key-user-id-list key))))
206 (insert (format "%c "
207 (if (epg-sub-key-validity primary-sub-key)
208 (car (rassq (epg-sub-key-validity primary-sub-key)
209 epg-key-validity-alist))
211 (epg-sub-key-id primary-sub-key)
213 (if (stringp (epg-user-id-string primary-user-id))
214 (epg-user-id-string primary-user-id)
215 (epg-decode-dn (epg-user-id-string primary-user-id))))))
217 (defun epa-key-widget-button-face-get (widget)
218 (let ((validity (epg-sub-key-validity (car (epg-key-sub-key-list
219 (widget-get widget :value))))))
221 (cdr (assq validity epa-validity-face-alist))
224 (defun epa-key-widget-help-echo (widget)
226 (epg-sub-key-id (car (epg-key-sub-key-list
227 (widget-get widget :value))))))
229 (defun epa--temp-buffer-show-function (buffer)
230 (save-selected-window
231 (let ((window (or (get-buffer-window buffer)
233 (select-window (get-largest-window))
234 (split-window-vertically)))))
235 (set-window-buffer window buffer)
237 (select-window window))
238 (unless (pos-visible-in-window-p (point-max))
239 (enlarge-window (- epa-info-window-height (window-height))))
240 (let ((height (window-height)))
241 (if (> height epa-info-window-height)
242 (shrink-window (- height epa-info-window-height)))
243 (set-window-start window (point-min)))
244 (with-current-buffer buffer
245 (setq buffer-read-only t)))))
247 (defun epa-display-verify-result (verify-result)
248 (if epa-popup-info-window
249 (let ((temp-buffer-show-function #'epa--temp-buffer-show-function))
250 (with-output-to-temp-buffer "*Info*"
252 (set-buffer standard-output)
253 (insert (epg-verify-result-to-string verify-result)))))
254 (message "%s" (epg-verify-result-to-string verify-result))))
256 (defun epa-keys-mode ()
257 "Major mode for `epa-list-keys'."
258 (kill-all-local-variables)
259 (buffer-disable-undo)
260 (setq major-mode 'epa-keys-mode
264 (use-local-map epa-keys-mode-map)
265 (set-keymap-parent (current-local-map) widget-keymap)
266 (make-local-variable 'font-lock-defaults)
267 (setq font-lock-defaults '(epa-font-lock-keywords t))
268 ;; In XEmacs, auto-initialization of font-lock is not effective
269 ;; if buffer-file-name is not set.
270 (font-lock-set-defaults)
272 (make-local-variable 'epa-exit-buffer-function)
273 (run-hooks 'epa-keys-mode-hook))
275 (defvar epa-key-mode-map
276 (let ((keymap (make-sparse-keymap)))
277 (define-key keymap "q" 'bury-buffer)
280 (defun epa-key-mode ()
281 "Major mode for `epa-show-key'."
282 (kill-all-local-variables)
283 (buffer-disable-undo)
284 (setq major-mode 'epa-key-mode
288 (use-local-map epa-key-mode-map)
289 (make-local-variable 'font-lock-defaults)
290 (setq font-lock-defaults '(epa-font-lock-keywords t))
291 ;; In XEmacs, auto-initialization of font-lock is not effective
292 ;; if buffer-file-name is not set.
293 (font-lock-set-defaults)
294 (make-local-variable 'epa-exit-buffer-function)
295 (run-hooks 'epa-key-mode-hook))
298 (defun epa-list-keys (&optional name mode protocol)
300 (if current-prefix-arg
301 (let ((name (read-string "Pattern: "
302 (if epa-list-keys-arguments
303 (car epa-list-keys-arguments)))))
304 (list (if (equal name "") nil name)
305 (y-or-n-p "Secret keys? ")
306 (intern (completing-read "Protocol? "
307 '(("OpenPGP") ("CMS"))
309 (or epa-list-keys-arguments (list nil nil nil))))
310 (unless (and epa-keys-buffer
311 (buffer-live-p epa-keys-buffer))
312 (setq epa-keys-buffer (generate-new-buffer "*Keys*")))
313 (set-buffer epa-keys-buffer)
314 (let ((inhibit-read-only t)
317 (context (epg-make-context protocol)))
318 (unless (get-text-property point 'epa-list-keys)
319 (setq point (next-single-property-change point 'epa-list-keys)))
322 (or (next-single-property-change point 'epa-list-keys)
325 (epa-insert-keys context name mode)
327 (make-local-variable 'epa-list-keys-arguments)
328 (setq epa-list-keys-arguments (list name mode protocol))
329 (goto-char (point-min))
330 (pop-to-buffer (current-buffer)))
332 (defun epa-insert-keys (context name mode)
335 (narrow-to-region (point) (point))
336 (let ((keys (epg-list-keys context name mode))
341 (add-text-properties point (point)
342 (list 'epa-key (car keys)
347 (widget-create 'epa-key :value (car keys))
349 (setq keys (cdr keys))))
350 (add-text-properties (point-min) (point-max)
351 (list 'epa-list-keys t
357 (defun epa-marked-keys ()
359 (set-buffer epa-keys-buffer)
360 (goto-char (point-min))
362 (while (re-search-forward "^\\*" nil t)
363 (if (setq key (get-text-property (match-beginning 0)
365 (setq keys (cons key keys))))
369 (let ((key (get-text-property (point) 'epa-key)))
374 (defun epa-select-keys (context prompt &optional names secret)
375 "Display a user's keyring and ask him to select keys.
376 CONTEXT is an epg-context.
377 PROMPT is a string to prompt with.
378 NAMES is a list of strings to be matched with keys. If it is nil, all
380 If SECRET is non-nil, list secret keys instead of public keys."
382 (unless (and epa-keys-buffer
383 (buffer-live-p epa-keys-buffer))
384 (setq epa-keys-buffer (generate-new-buffer "*Keys*")))
385 (let ((inhibit-read-only t)
388 (set-buffer epa-keys-buffer)
392 :notify (lambda (&rest ignore) (abort-recursive-edit))
394 (substitute-command-keys
395 "Click here or \\[abort-recursive-edit] to cancel")
398 :notify (lambda (&rest ignore) (exit-recursive-edit))
400 (substitute-command-keys
401 "Click here or \\[exit-recursive-edit] to finish")
407 (epa-insert-keys context (car names) secret)
410 (goto-char (point-max))
411 (setq names (cdr names)))
412 (epa-insert-keys context nil secret))
414 (setq epa-exit-buffer-function #'abort-recursive-edit)
415 (goto-char (point-min))
416 (pop-to-buffer (current-buffer)))
421 (if (get-buffer-window epa-keys-buffer)
422 (delete-window (get-buffer-window epa-keys-buffer)))
423 (kill-buffer epa-keys-buffer))))
425 (defun epa-show-key (key)
426 (let* ((primary-sub-key (car (epg-key-sub-key-list key)))
427 (entry (assoc (epg-sub-key-id primary-sub-key)
428 epa-key-buffer-alist))
429 (inhibit-read-only t)
433 (setq entry (cons (epg-sub-key-id primary-sub-key) nil)
434 epa-key-buffer-alist (cons entry epa-key-buffer-alist)))
435 (unless (and (cdr entry)
436 (buffer-live-p (cdr entry)))
437 (setcdr entry (generate-new-buffer
438 (format "*Key*%s" (epg-sub-key-id primary-sub-key)))))
439 (set-buffer (cdr entry))
440 (make-local-variable 'epa-key)
443 (setq pointer (epg-key-user-id-list key))
446 (if (epg-user-id-validity (car pointer))
448 (car (rassq (epg-user-id-validity (car pointer))
449 epg-key-validity-alist)))
452 (if (stringp (epg-user-id-string (car pointer)))
453 (epg-user-id-string (car pointer))
454 (epg-decode-dn (epg-user-id-string (car pointer))))
456 (setq pointer (cdr pointer)))
457 (setq pointer (epg-key-sub-key-list key))
460 (if (epg-sub-key-validity (car pointer))
462 (car (rassq (epg-sub-key-validity (car pointer))
463 epg-key-validity-alist)))
466 (epg-sub-key-id (car pointer))
469 (epg-sub-key-length (car pointer)))
471 (cdr (assq (epg-sub-key-algorithm (car pointer))
472 epg-pubkey-algorithm-alist))
474 (epg-sub-key-creation-time (car pointer))
475 (if (epg-sub-key-expiration-time (car pointer))
476 (format "\n\tExpires: %s" (epg-sub-key-expiration-time
480 (mapconcat #'symbol-name
481 (epg-sub-key-capability (car pointer))
484 (epg-sub-key-fingerprint (car pointer))
486 (setq pointer (cdr pointer)))
487 (goto-char (point-min))
488 (pop-to-buffer (current-buffer))
491 (defun epa-show-key-notify (widget &rest ignore)
492 (epa-show-key (widget-get widget :value)))
494 (defun epa-mark (&optional arg)
495 "Mark the current line.
496 If ARG is non-nil, unmark the current line."
498 (let ((inhibit-read-only t)
502 (setq properties (text-properties-at (point)))
504 (insert (if arg " " "*"))
505 (set-text-properties (1- (point)) (point) properties)
508 (defun epa-unmark (&optional arg)
509 "Unmark the current line.
510 If ARG is non-nil, mark the current line."
512 (epa-mark (not arg)))
514 (defun epa-exit-buffer ()
515 "Exit the current buffer.
516 `epa-exit-buffer-function' is called if it is set."
518 (funcall epa-exit-buffer-function))
521 (defun epa-decrypt-file (file)
523 (interactive "fFile: ")
524 (let* ((default-name (file-name-sans-extension file))
525 (plain (expand-file-name
527 (concat "To file (default "
528 (file-name-nondirectory default-name)
530 (file-name-directory default-name)
532 (context (epg-make-context)))
533 (message "Decrypting %s..." (file-name-nondirectory file))
534 (epg-decrypt-file context file plain)
535 (message "Decrypting %s...done" (file-name-nondirectory file))
536 (if (epg-context-result-for context 'verify)
537 (epa-display-verify-result (epg-context-result-for context 'verify)))))
540 (defun epa-verify-file (file)
542 (interactive "fFile: ")
543 (let* ((context (epg-make-context))
544 (plain (if (equal (file-name-extension file) "sig")
545 (file-name-sans-extension file))))
546 (message "Verifying %s..." (file-name-nondirectory file))
547 (epg-verify-file context file plain)
548 (message "Verifying %s...done" (file-name-nondirectory file))
549 (if (epg-context-result-for context 'verify)
550 (epa-display-verify-result (epg-context-result-for context 'verify)))))
553 (defun epa-sign-file (file signers mode)
554 "Sign FILE by SIGNERS keys selected."
556 (list (expand-file-name (read-file-name "File: "))
557 (epa-select-keys (epg-make-context) "Select keys for signing.
558 If no one is selected, default secret key is used. "
560 (if (y-or-n-p "Make a detached signature? ")
562 (if (y-or-n-p "Make a cleartext signature? ")
564 (let ((signature (concat file
566 (not (memq mode '(nil t normal detached))))
568 (if (memq mode '(t detached))
571 (context (epg-make-context)))
572 (epg-context-set-armor context epa-armor)
573 (epg-context-set-textmode context epa-textmode)
574 (epg-context-set-signers context signers)
575 (message "Signing %s..." (file-name-nondirectory file))
576 (epg-sign-file context file signature mode)
577 (message "Signing %s...done" (file-name-nondirectory file))))
580 (defun epa-encrypt-file (file recipients)
581 "Encrypt FILE for RECIPIENTS."
583 (list (expand-file-name (read-file-name "File: "))
584 (epa-select-keys (epg-make-context) "Select recipents for encryption.
585 If no one is selected, symmetric encryption will be performed. ")))
586 (let ((cipher (concat file (if epa-armor ".asc" ".gpg")))
587 (context (epg-make-context)))
588 (epg-context-set-armor context epa-armor)
589 (epg-context-set-textmode context epa-textmode)
590 (message "Encrypting %s..." (file-name-nondirectory file))
591 (epg-encrypt-file context file recipients cipher)
592 (message "Encrypting %s...done" (file-name-nondirectory file))))
595 (defun epa-decrypt-region (start end)
596 "Decrypt the current region between START and END.
598 Don't use this command in Lisp programs!"
601 (let ((context (epg-make-context))
603 (message "Decrypting...")
604 (setq plain (epg-decrypt-string context (buffer-substring start end)))
605 (message "Decrypting...done")
606 (delete-region start end)
608 (insert (decode-coding-string plain coding-system-for-read))
609 (if (epg-context-result-for context 'verify)
610 (epa-display-verify-result (epg-context-result-for context 'verify))))))
613 (defun epa-decrypt-armor-in-region (start end)
614 "Decrypt OpenPGP armors in the current region between START and END.
616 Don't use this command in Lisp programs!"
620 (narrow-to-region start end)
622 (let (armor-start armor-end charset coding-system)
623 (while (re-search-forward "-----BEGIN PGP MESSAGE-----$" nil t)
624 (setq armor-start (match-beginning 0)
625 armor-end (re-search-forward "^-----END PGP MESSAGE-----$"
628 (error "No armor tail"))
629 (goto-char armor-start)
630 (if (re-search-forward "^Charset: \\(.*\\)" armor-end t)
631 (setq charset (match-string 1)))
632 (if coding-system-for-read
633 (setq coding-system coding-system-for-read)
635 (setq coding-system (intern (downcase charset)))
636 (setq coding-system 'utf-8)))
637 (let ((coding-system-for-read coding-system))
638 (epa-decrypt-region start end)))))))
641 (defun epa-verify-region (start end)
642 "Verify the current region between START and END.
644 Don't use this command in Lisp programs!"
646 (let ((context (epg-make-context)))
647 (epg-verify-string context
648 (encode-coding-string
649 (buffer-substring start end)
650 coding-system-for-write))
651 (if (epg-context-result-for context 'verify)
652 (epa-display-verify-result (epg-context-result-for context 'verify)))))
655 (defun epa-verify-armor-in-region (start end)
656 "Verify OpenPGP armors in the current region between START and END.
658 Don't use this command in Lisp programs!"
662 (narrow-to-region start end)
664 (let (armor-start armor-end)
665 (while (re-search-forward "-----BEGIN PGP\\( SIGNED\\)? MESSAGE-----$"
667 (setq armor-start (match-beginning 0))
668 (if (match-beginning 1) ;cleartext signed message
670 (unless (re-search-forward "^-----BEGIN PGP SIGNATURE-----$"
672 (error "Invalid cleartext signed message"))
673 (setq armor-end (re-search-forward
674 "^-----END PGP SIGNATURE-----$"
676 (setq armor-end (re-search-forward
677 "^-----END PGP MESSAGE-----$"
680 (error "No armor tail"))
681 (epa-verify-region armor-start armor-end))))))
684 (defun epa-sign-region (start end signers mode)
685 "Sign the current region between START and END by SIGNERS keys selected.
687 Don't use this command in Lisp programs!"
689 (list (region-beginning) (region-end)
690 (epa-select-keys (epg-make-context) "Select keys for signing.
691 If no one is selected, default secret key is used. "
693 (if (y-or-n-p "Make a detached signature? ")
695 (if (y-or-n-p "Make a cleartext signature? ")
698 (let ((context (epg-make-context))
700 (epg-context-set-armor context epa-armor)
701 (epg-context-set-textmode context epa-textmode)
702 (epg-context-set-signers context signers)
703 (message "Signing...")
704 (setq signature (epg-sign-string context
705 (encode-coding-string
706 (buffer-substring start end)
707 coding-system-for-write)
709 (message "Signing...done")
710 (delete-region start end)
711 (insert (decode-coding-string signature coding-system-for-read)))))
714 (defun epa-encrypt-region (start end recipients)
715 "Encrypt the current region between START and END for RECIPIENTS.
717 Don't use this command in Lisp programs!"
719 (list (region-beginning) (region-end)
720 (epa-select-keys (epg-make-context) "Select recipents for encryption.
721 If no one is selected, symmetric encryption will be performed. ")))
723 (let ((context (epg-make-context))
725 (epg-context-set-armor context epa-armor)
726 (epg-context-set-textmode context epa-textmode)
727 (message "Encrypting...")
728 (setq cipher (epg-encrypt-string context
729 (encode-coding-string
730 (buffer-substring start end)
731 coding-system-for-write)
733 (message "Encrypting...done")
734 (delete-region start end)
738 (defun epa-delete-keys (keys &optional allow-secret)
739 "Delete selected KEYS."
741 (let ((keys (epa-marked-keys)))
743 (error "No keys selected"))
745 (eq (nth 1 epa-list-keys-arguments) t))))
746 (let ((context (epg-make-context)))
747 (message "Deleting...")
748 (epg-delete-keys context keys allow-secret)
749 (message "Deleting...done")
750 (apply #'epa-list-keys epa-list-keys-arguments)))
753 (defun epa-import-keys (file)
754 "Import keys from FILE."
755 (interactive "fFile: ")
756 (let ((context (epg-make-context)))
757 (message "Importing %s..." (file-name-nondirectory file))
758 (epg-import-keys-from-file context (expand-file-name file))
759 (message "Importing %s...done" (file-name-nondirectory file))
760 (apply #'epa-list-keys epa-list-keys-arguments)))
763 (defun epa-export-keys (keys file)
764 "Export selected KEYS to FILE."
766 (let ((keys (epa-marked-keys))
769 (error "No keys selected"))
772 (concat (epg-sub-key-id (car (epg-key-sub-key-list (car keys))))
773 (if epa-armor ".asc" ".gpg"))
778 (concat "To file (default "
779 (file-name-nondirectory default-name)
781 (file-name-directory default-name)
783 (let ((context (epg-make-context)))
784 (epg-context-set-armor context epa-armor)
785 (message "Exporting to %s..." (file-name-nondirectory file))
786 (epg-export-keys-to-file context keys file)
787 (message "Exporting to %s...done" (file-name-nondirectory file))))
790 (defun epa-sign-keys (keys &optional local)
792 If LOCAL is non-nil, the signature is marked as non exportable."
794 (let ((keys (epa-marked-keys)))
796 (error "No keys selected"))
797 (list keys current-prefix-arg)))
798 (let ((context (epg-make-context)))
799 (message "Signing keys...")
800 (epg-sign-keys context keys local)
801 (message "Signing keys...done")))