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 nil
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)
168 (defvar epa-info-buffer nil)
170 (defvar epa-keys-mode-map
171 (let ((keymap (make-sparse-keymap)))
172 (define-key keymap "m" 'epa-mark)
173 (define-key keymap "u" 'epa-unmark)
174 (define-key keymap "d" 'epa-decrypt-file)
175 (define-key keymap "v" 'epa-verify-file)
176 (define-key keymap "s" 'epa-sign-file)
177 (define-key keymap "S" 'epa-sign-keys)
178 (define-key keymap "e" 'epa-encrypt-file)
179 (define-key keymap "r" 'epa-delete-keys)
180 (define-key keymap "i" 'epa-import-keys)
181 (define-key keymap "o" 'epa-export-keys)
182 (define-key keymap "g" 'epa-list-keys)
183 (define-key keymap "n" 'next-line)
184 (define-key keymap "p" 'previous-line)
185 (define-key keymap " " 'scroll-up)
186 (define-key keymap [delete] 'scroll-down)
187 (define-key keymap "q" 'epa-exit-buffer)
190 (defvar epa-key-mode-map
191 (let ((keymap (make-sparse-keymap)))
192 (define-key keymap "q" 'bury-buffer)
195 (defvar epa-info-mode-map
196 (let ((keymap (make-sparse-keymap)))
197 (define-key keymap "q" 'delete-window)
200 (defvar epa-exit-buffer-function #'bury-buffer)
202 (define-widget 'epa-key 'push-button
203 "Button for representing a epg-key object."
205 :button-face-get 'epa-key-widget-button-face-get
206 :value-create 'epa-key-widget-value-create
207 :action 'epa-key-widget-action
208 :help-echo 'epa-key-widget-help-echo)
210 (defun epa-key-widget-action (widget &optional event)
211 (epa-show-key (widget-get widget :value)))
213 (defun epa-key-widget-value-create (widget)
214 (let* ((key (widget-get widget :value))
215 (primary-sub-key (car (epg-key-sub-key-list key)))
216 (primary-user-id (car (epg-key-user-id-list key))))
217 (insert (format "%c "
218 (if (epg-sub-key-validity primary-sub-key)
219 (car (rassq (epg-sub-key-validity primary-sub-key)
220 epg-key-validity-alist))
222 (epg-sub-key-id primary-sub-key)
224 (if (stringp (epg-user-id-string primary-user-id))
225 (epg-user-id-string primary-user-id)
226 (epg-decode-dn (epg-user-id-string primary-user-id))))))
228 (defun epa-key-widget-button-face-get (widget)
229 (let ((validity (epg-sub-key-validity (car (epg-key-sub-key-list
230 (widget-get widget :value))))))
232 (cdr (assq validity epa-validity-face-alist))
235 (defun epa-key-widget-help-echo (widget)
237 (epg-sub-key-id (car (epg-key-sub-key-list
238 (widget-get widget :value))))))
240 (defun epa-keys-mode ()
241 "Major mode for `epa-list-keys'."
242 (kill-all-local-variables)
243 (buffer-disable-undo)
244 (setq major-mode 'epa-keys-mode
248 (use-local-map epa-keys-mode-map)
249 (set-keymap-parent (current-local-map) widget-keymap)
250 (make-local-variable 'font-lock-defaults)
251 (setq font-lock-defaults '(epa-font-lock-keywords t))
252 ;; In XEmacs, auto-initialization of font-lock is not effective
253 ;; if buffer-file-name is not set.
254 (font-lock-set-defaults)
256 (make-local-variable 'epa-exit-buffer-function)
257 (run-hooks 'epa-keys-mode-hook))
259 (defun epa-key-mode ()
260 "Major mode for `epa-show-key'."
261 (kill-all-local-variables)
262 (buffer-disable-undo)
263 (setq major-mode 'epa-key-mode
267 (use-local-map epa-key-mode-map)
268 (make-local-variable 'font-lock-defaults)
269 (setq font-lock-defaults '(epa-font-lock-keywords t))
270 ;; In XEmacs, auto-initialization of font-lock is not effective
271 ;; if buffer-file-name is not set.
272 (font-lock-set-defaults)
273 (make-local-variable 'epa-exit-buffer-function)
274 (run-hooks 'epa-key-mode-hook))
277 (defun epa-list-keys (&optional name mode protocol)
279 (if current-prefix-arg
280 (let ((name (read-string "Pattern: "
281 (if epa-list-keys-arguments
282 (car epa-list-keys-arguments)))))
283 (list (if (equal name "") nil name)
284 (y-or-n-p "Secret keys? ")
285 (intern (completing-read "Protocol? "
286 '(("OpenPGP") ("CMS"))
288 (or epa-list-keys-arguments (list nil nil nil))))
289 (unless (and epa-keys-buffer
290 (buffer-live-p epa-keys-buffer))
291 (setq epa-keys-buffer (generate-new-buffer "*Keys*")))
292 (set-buffer epa-keys-buffer)
293 (let ((inhibit-read-only t)
296 (context (epg-make-context protocol)))
297 (unless (get-text-property point 'epa-list-keys)
298 (setq point (next-single-property-change point 'epa-list-keys)))
301 (or (next-single-property-change point 'epa-list-keys)
304 (epa-insert-keys context name mode)
306 (make-local-variable 'epa-list-keys-arguments)
307 (setq epa-list-keys-arguments (list name mode protocol))
308 (goto-char (point-min))
309 (pop-to-buffer (current-buffer)))
311 (defun epa-insert-keys (context name mode)
314 (narrow-to-region (point) (point))
315 (let ((keys (epg-list-keys context name mode))
320 (add-text-properties point (point)
321 (list 'epa-key (car keys)
326 (widget-create 'epa-key :value (car keys))
328 (setq keys (cdr keys))))
329 (add-text-properties (point-min) (point-max)
330 (list 'epa-list-keys t
336 (defun epa-marked-keys ()
338 (set-buffer epa-keys-buffer)
339 (goto-char (point-min))
341 (while (re-search-forward "^\\*" nil t)
342 (if (setq key (get-text-property (match-beginning 0)
344 (setq keys (cons key keys))))
348 (let ((key (get-text-property (point) 'epa-key)))
353 (defun epa-select-keys (context prompt &optional names secret)
354 "Display a user's keyring and ask him to select keys.
355 CONTEXT is an epg-context.
356 PROMPT is a string to prompt with.
357 NAMES is a list of strings to be matched with keys. If it is nil, all
359 If SECRET is non-nil, list secret keys instead of public keys."
361 (unless (and epa-keys-buffer
362 (buffer-live-p epa-keys-buffer))
363 (setq epa-keys-buffer (generate-new-buffer "*Keys*")))
364 (let ((inhibit-read-only t)
367 (set-buffer epa-keys-buffer)
371 :notify (lambda (&rest ignore) (abort-recursive-edit))
373 (substitute-command-keys
374 "Click here or \\[abort-recursive-edit] to cancel")
377 :notify (lambda (&rest ignore) (exit-recursive-edit))
379 (substitute-command-keys
380 "Click here or \\[exit-recursive-edit] to finish")
386 (epa-insert-keys context (car names) secret)
389 (goto-char (point-max))
390 (setq names (cdr names)))
391 (epa-insert-keys context nil secret))
393 (setq epa-exit-buffer-function #'abort-recursive-edit)
394 (goto-char (point-min))
395 (pop-to-buffer (current-buffer)))
400 (if (get-buffer-window epa-keys-buffer)
401 (delete-window (get-buffer-window epa-keys-buffer)))
402 (kill-buffer epa-keys-buffer))))
404 (defun epa-show-key (key)
405 (let* ((primary-sub-key (car (epg-key-sub-key-list key)))
406 (entry (assoc (epg-sub-key-id primary-sub-key)
407 epa-key-buffer-alist))
408 (inhibit-read-only t)
412 (setq entry (cons (epg-sub-key-id primary-sub-key) nil)
413 epa-key-buffer-alist (cons entry epa-key-buffer-alist)))
414 (unless (and (cdr entry)
415 (buffer-live-p (cdr entry)))
416 (setcdr entry (generate-new-buffer
417 (format "*Key*%s" (epg-sub-key-id primary-sub-key)))))
418 (set-buffer (cdr entry))
419 (make-local-variable 'epa-key)
422 (setq pointer (epg-key-user-id-list key))
425 (if (epg-user-id-validity (car pointer))
427 (car (rassq (epg-user-id-validity (car pointer))
428 epg-key-validity-alist)))
431 (if (stringp (epg-user-id-string (car pointer)))
432 (epg-user-id-string (car pointer))
433 (epg-decode-dn (epg-user-id-string (car pointer))))
435 (setq pointer (cdr pointer)))
436 (setq pointer (epg-key-sub-key-list key))
439 (if (epg-sub-key-validity (car pointer))
441 (car (rassq (epg-sub-key-validity (car pointer))
442 epg-key-validity-alist)))
445 (epg-sub-key-id (car pointer))
448 (epg-sub-key-length (car pointer)))
450 (cdr (assq (epg-sub-key-algorithm (car pointer))
451 epg-pubkey-algorithm-alist))
453 (format-time-string "%Y-%m-%d"
454 (epg-sub-key-creation-time (car pointer)))
455 (if (epg-sub-key-expiration-time (car pointer))
456 (format "\n\tExpires: %s"
457 (format-time-string "%Y-%m-%d"
458 (epg-sub-key-expiration-time
462 (mapconcat #'symbol-name
463 (epg-sub-key-capability (car pointer))
466 (epg-sub-key-fingerprint (car pointer))
468 (setq pointer (cdr pointer)))
469 (goto-char (point-min))
470 (pop-to-buffer (current-buffer))
473 (defun epa-show-key-notify (widget &rest ignore)
474 (epa-show-key (widget-get widget :value)))
476 (defun epa-mark (&optional arg)
477 "Mark the current line.
478 If ARG is non-nil, unmark the current line."
480 (let ((inhibit-read-only t)
484 (setq properties (text-properties-at (point)))
486 (insert (if arg " " "*"))
487 (set-text-properties (1- (point)) (point) properties)
490 (defun epa-unmark (&optional arg)
491 "Unmark the current line.
492 If ARG is non-nil, mark the current line."
494 (epa-mark (not arg)))
496 (defun epa-exit-buffer ()
497 "Exit the current buffer.
498 `epa-exit-buffer-function' is called if it is set."
500 (funcall epa-exit-buffer-function))
502 (defun epa-display-verify-result (verify-result)
503 (if epa-popup-info-window
505 (unless epa-info-buffer
506 (setq epa-info-buffer (generate-new-buffer "*Info*")))
508 (set-buffer epa-info-buffer)
509 (let ((inhibit-read-only t)
512 (insert (epg-verify-result-to-string verify-result)))
514 (pop-to-buffer epa-info-buffer)
515 (if (> (window-height) epa-info-window-height)
516 (shrink-window (- (window-height) epa-info-window-height)))
517 (goto-char (point-min)))
518 (message "%s" (epg-verify-result-to-string verify-result))))
520 (defun epa-info-mode ()
521 "Major mode for `epa-info-buffer'."
522 (kill-all-local-variables)
523 (buffer-disable-undo)
524 (setq major-mode 'epa-info-mode
528 (use-local-map epa-info-mode-map)
529 (run-hooks 'epa-info-mode-hook))
532 (defun epa-decrypt-file (file)
534 (interactive "fFile: ")
535 (let* ((default-name (file-name-sans-extension file))
536 (plain (expand-file-name
538 (concat "To file (default "
539 (file-name-nondirectory default-name)
541 (file-name-directory default-name)
543 (context (epg-make-context)))
544 (message "Decrypting %s..." (file-name-nondirectory file))
545 (epg-decrypt-file context file plain)
546 (message "Decrypting %s...done" (file-name-nondirectory file))
547 (if (epg-context-result-for context 'verify)
548 (epa-display-verify-result (epg-context-result-for context 'verify)))))
551 (defun epa-verify-file (file)
553 (interactive "fFile: ")
554 (let* ((context (epg-make-context))
555 (plain (if (equal (file-name-extension file) "sig")
556 (file-name-sans-extension file))))
557 (message "Verifying %s..." (file-name-nondirectory file))
558 (epg-verify-file context file plain)
559 (message "Verifying %s...done" (file-name-nondirectory file))
560 (if (epg-context-result-for context 'verify)
561 (epa-display-verify-result (epg-context-result-for context 'verify)))))
564 (defun epa-sign-file (file signers mode)
565 "Sign FILE by SIGNERS keys selected."
567 (list (expand-file-name (read-file-name "File: "))
568 (epa-select-keys (epg-make-context) "Select keys for signing.
569 If no one is selected, default secret key is used. "
571 (if (y-or-n-p "Make a detached signature? ")
573 (if (y-or-n-p "Make a cleartext signature? ")
575 (let ((signature (concat file
577 (not (memq mode '(nil t normal detached))))
579 (if (memq mode '(t detached))
582 (context (epg-make-context)))
583 (epg-context-set-armor context epa-armor)
584 (epg-context-set-textmode context epa-textmode)
585 (epg-context-set-signers context signers)
586 (message "Signing %s..." (file-name-nondirectory file))
587 (epg-sign-file context file signature mode)
588 (message "Signing %s...done" (file-name-nondirectory file))))
591 (defun epa-encrypt-file (file recipients)
592 "Encrypt FILE for RECIPIENTS."
594 (list (expand-file-name (read-file-name "File: "))
595 (epa-select-keys (epg-make-context) "Select recipents for encryption.
596 If no one is selected, symmetric encryption will be performed. ")))
597 (let ((cipher (concat file (if epa-armor ".asc" ".gpg")))
598 (context (epg-make-context)))
599 (epg-context-set-armor context epa-armor)
600 (epg-context-set-textmode context epa-textmode)
601 (message "Encrypting %s..." (file-name-nondirectory file))
602 (epg-encrypt-file context file recipients cipher)
603 (message "Encrypting %s...done" (file-name-nondirectory file))))
606 (defun epa-decrypt-region (start end)
607 "Decrypt the current region between START and END.
609 Don't use this command in Lisp programs!"
612 (let ((context (epg-make-context))
614 (message "Decrypting...")
615 (setq plain (epg-decrypt-string context (buffer-substring start end)))
616 (message "Decrypting...done")
617 (delete-region start end)
619 (insert (decode-coding-string plain coding-system-for-read))
620 (if (epg-context-result-for context 'verify)
621 (epa-display-verify-result (epg-context-result-for context 'verify))))))
624 (defun epa-decrypt-armor-in-region (start end)
625 "Decrypt OpenPGP armors in the current region between START and END.
627 Don't use this command in Lisp programs!"
631 (narrow-to-region start end)
633 (let (armor-start armor-end charset coding-system)
634 (while (re-search-forward "-----BEGIN PGP MESSAGE-----$" nil t)
635 (setq armor-start (match-beginning 0)
636 armor-end (re-search-forward "^-----END PGP MESSAGE-----$"
639 (error "No armor tail"))
640 (goto-char armor-start)
641 (if (re-search-forward "^Charset: \\(.*\\)" armor-end t)
642 (setq charset (match-string 1)))
643 (if coding-system-for-read
644 (setq coding-system coding-system-for-read)
646 (setq coding-system (intern (downcase charset)))
647 (setq coding-system 'utf-8)))
648 (let ((coding-system-for-read coding-system))
649 (epa-decrypt-region start end)))))))
652 (defun epa-verify-region (start end)
653 "Verify the current region between START and END.
655 Don't use this command in Lisp programs!"
657 (let ((context (epg-make-context)))
658 (epg-verify-string context
659 (encode-coding-string
660 (buffer-substring start end)
661 coding-system-for-write))
662 (if (epg-context-result-for context 'verify)
663 (epa-display-verify-result (epg-context-result-for context 'verify)))))
666 (defun epa-verify-armor-in-region (start end)
667 "Verify OpenPGP armors in the current region between START and END.
669 Don't use this command in Lisp programs!"
673 (narrow-to-region start end)
675 (let (armor-start armor-end)
676 (while (re-search-forward "-----BEGIN PGP\\( SIGNED\\)? MESSAGE-----$"
678 (setq armor-start (match-beginning 0))
679 (if (match-beginning 1) ;cleartext signed message
681 (unless (re-search-forward "^-----BEGIN PGP SIGNATURE-----$"
683 (error "Invalid cleartext signed message"))
684 (setq armor-end (re-search-forward
685 "^-----END PGP SIGNATURE-----$"
687 (setq armor-end (re-search-forward
688 "^-----END PGP MESSAGE-----$"
691 (error "No armor tail"))
692 (epa-verify-region armor-start armor-end))))))
695 (defun epa-sign-region (start end signers mode)
696 "Sign the current region between START and END by SIGNERS keys selected.
698 Don't use this command in Lisp programs!"
700 (list (region-beginning) (region-end)
701 (epa-select-keys (epg-make-context) "Select keys for signing.
702 If no one is selected, default secret key is used. "
704 (if (y-or-n-p "Make a detached signature? ")
706 (if (y-or-n-p "Make a cleartext signature? ")
709 (let ((context (epg-make-context))
711 (epg-context-set-armor context epa-armor)
712 (epg-context-set-textmode context epa-textmode)
713 (epg-context-set-signers context signers)
714 (message "Signing...")
715 (setq signature (epg-sign-string context
716 (encode-coding-string
717 (buffer-substring start end)
718 coding-system-for-write)
720 (message "Signing...done")
721 (delete-region start end)
722 (insert (decode-coding-string signature coding-system-for-read)))))
725 (defun epa-encrypt-region (start end recipients)
726 "Encrypt the current region between START and END for RECIPIENTS.
728 Don't use this command in Lisp programs!"
730 (list (region-beginning) (region-end)
731 (epa-select-keys (epg-make-context) "Select recipents for encryption.
732 If no one is selected, symmetric encryption will be performed. ")))
734 (let ((context (epg-make-context))
736 (epg-context-set-armor context epa-armor)
737 (epg-context-set-textmode context epa-textmode)
738 (message "Encrypting...")
739 (setq cipher (epg-encrypt-string context
740 (encode-coding-string
741 (buffer-substring start end)
742 coding-system-for-write)
744 (message "Encrypting...done")
745 (delete-region start end)
749 (defun epa-delete-keys (keys &optional allow-secret)
750 "Delete selected KEYS."
752 (let ((keys (epa-marked-keys)))
754 (error "No keys selected"))
756 (eq (nth 1 epa-list-keys-arguments) t))))
757 (let ((context (epg-make-context)))
758 (message "Deleting...")
759 (epg-delete-keys context keys allow-secret)
760 (message "Deleting...done")
761 (apply #'epa-list-keys epa-list-keys-arguments)))
764 (defun epa-import-keys (file)
765 "Import keys from FILE."
766 (interactive "fFile: ")
767 (let ((context (epg-make-context)))
768 (message "Importing %s..." (file-name-nondirectory file))
769 (epg-import-keys-from-file context (expand-file-name file))
770 (message "Importing %s...done" (file-name-nondirectory file))
771 (apply #'epa-list-keys epa-list-keys-arguments)))
774 (defun epa-export-keys (keys file)
775 "Export selected KEYS to FILE."
777 (let ((keys (epa-marked-keys))
780 (error "No keys selected"))
783 (concat (epg-sub-key-id (car (epg-key-sub-key-list (car keys))))
784 (if epa-armor ".asc" ".gpg"))
789 (concat "To file (default "
790 (file-name-nondirectory default-name)
792 (file-name-directory default-name)
794 (let ((context (epg-make-context)))
795 (epg-context-set-armor context epa-armor)
796 (message "Exporting to %s..." (file-name-nondirectory file))
797 (epg-export-keys-to-file context keys file)
798 (message "Exporting to %s...done" (file-name-nondirectory file))))
801 (defun epa-sign-keys (keys &optional local)
803 If LOCAL is non-nil, the signature is marked as non exportable."
805 (let ((keys (epa-marked-keys)))
807 (error "No keys selected"))
808 (list keys current-prefix-arg)))
809 (let ((context (epg-make-context)))
810 (message "Signing keys...")
811 (epg-sign-keys context keys local)
812 (message "Signing keys...done")))