lisp/epa-mail.el

   1 ;;; epa-mail.el --- the EasyPG Assistant, minor-mode for mail composer
   2 ;; Copyright (C) 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
   3
   4 ;; Author: Daiki Ueno <ueno@unixuser.org>
   5 ;; Keywords: PGP, GnuPG, mail, message
   6
   7 ;; This file is part of GNU Emacs.
   8
   9 ;; GNU Emacs 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 3 of the License, or
  12 ;; (at your option) any later version.
  13
  14 ;; GNU Emacs 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.
  18
  19 ;; You should have received a copy of the GNU General Public License
  20 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  21
  22 ;;; Code:
  23
  24 (require 'epa)
  25 (require 'mail-utils)
  26
  27 (defvar epa-mail-mode-map
  28   (let ((keymap (make-sparse-keymap)))
  29     (define-key keymap "\C-c\C-ed" 'epa-mail-decrypt)
  30     (define-key keymap "\C-c\C-ev" 'epa-mail-verify)
  31     (define-key keymap "\C-c\C-es" 'epa-mail-sign)
  32     (define-key keymap "\C-c\C-ee" 'epa-mail-encrypt)
  33     (define-key keymap "\C-c\C-ei" 'epa-mail-import-keys)
  34     (define-key keymap "\C-c\C-eo" 'epa-insert-keys)
  35     (define-key keymap "\C-c\C-e\C-d" 'epa-mail-decrypt)
  36     (define-key keymap "\C-c\C-e\C-v" 'epa-mail-verify)
  37     (define-key keymap "\C-c\C-e\C-s" 'epa-mail-sign)
  38     (define-key keymap "\C-c\C-e\C-e" 'epa-mail-encrypt)
  39     (define-key keymap "\C-c\C-e\C-i" 'epa-mail-import-keys)
  40     (define-key keymap "\C-c\C-e\C-o" 'epa-insert-keys)
  41     keymap))
  42
  43 (defvar epa-mail-mode-hook nil)
  44 (defvar epa-mail-mode-on-hook nil)
  45 (defvar epa-mail-mode-off-hook nil)
  46
  47 ;;;###autoload
  48 (define-minor-mode epa-mail-mode
  49   "A minor-mode for composing encrypted/clearsigned mails."
  50   nil " epa-mail" epa-mail-mode-map)
  51
  52 (defun epa-mail--find-usable-key (keys usage)
  53   "Find a usable key from KEYS for USAGE."
  54   (catch 'found
  55     (while keys
  56       (let ((pointer (epg-key-sub-key-list (car keys))))
  57         (while pointer
  58           (if (and (memq usage (epg-sub-key-capability (car pointer)))
  59                    (not (memq (epg-sub-key-validity (car pointer))
  60                               '(revoked expired))))
  61               (throw 'found (car keys)))
  62           (setq pointer (cdr pointer))))
  63       (setq keys (cdr keys)))))
  64
  65 ;;;###autoload
  66 (defun epa-mail-decrypt ()
  67   "Decrypt OpenPGP armors in the current buffer.
  68 The buffer is expected to contain a mail message.
  69
  70 Don't use this command in Lisp programs!"
  71   (interactive)
  72   (epa-decrypt-armor-in-region (point-min) (point-max)))
  73
  74 ;;;###autoload
  75 (defun epa-mail-verify ()
  76   "Verify OpenPGP cleartext signed messages in the current buffer.
  77 The buffer is expected to contain a mail message.
  78
  79 Don't use this command in Lisp programs!"
  80   (interactive)
  81   (epa-verify-cleartext-in-region (point-min) (point-max)))
  82
  83 ;;;###autoload
  84 (defun epa-mail-sign (start end signers mode)
  85   "Sign the current buffer.
  86 The buffer is expected to contain a mail message.
  87
  88 Don't use this command in Lisp programs!"
  89   (interactive
  90    (save-excursion
  91      (goto-char (point-min))
  92      (if (search-forward mail-header-separator nil t)
  93          (forward-line))
  94      (setq epa-last-coding-system-specified
  95            (or coding-system-for-write
  96                (epa--select-safe-coding-system (point) (point-max))))
  97      (let ((verbose current-prefix-arg))
  98        (list (point) (point-max)
  99              (if verbose
 100                  (epa-select-keys (epg-make-context epa-protocol)
 101                                   "Select keys for signing.
 102 If no one is selected, default secret key is used.  "
 103                                   nil t))
 104              (if verbose
 105                  (epa--read-signature-type)
 106                'clear)))))
 107   (epa-sign-region start end signers mode))
 108
 109 ;;;###autoload
 110 (defun epa-mail-encrypt (start end recipients sign signers)
 111   "Encrypt the current buffer.
 112 The buffer is expected to contain a mail message.
 113
 114 Don't use this command in Lisp programs!"
 115   (interactive
 116    (save-excursion
 117      (let ((verbose current-prefix-arg)
 118            (context (epg-make-context epa-protocol))
 119            recipients recipient-key)
 120        (goto-char (point-min))
 121        (save-restriction
 122          (narrow-to-region (point)
 123                            (if (search-forward mail-header-separator nil 0)
 124                                (match-beginning 0)
 125                              (point)))
 126          (setq recipients
 127                (mail-strip-quoted-names
 128                 (mapconcat #'identity
 129                            (nconc (mail-fetch-field "to" nil nil t)
 130                                   (mail-fetch-field "cc" nil nil t)
 131                                   (mail-fetch-field "bcc" nil nil t))
 132                            ","))))
 133        (if recipients
 134            (setq recipients (delete ""
 135                                     (split-string recipients "[ \t\n]+"))))
 136        (goto-char (point-min))
 137        (if (search-forward mail-header-separator nil t)
 138            (forward-line))
 139        (setq epa-last-coding-system-specified
 140              (or coding-system-for-write
 141                  (epa--select-safe-coding-system (point) (point-max))))
 142        (list (point) (point-max)
 143              (if verbose
 144                  (epa-select-keys
 145                   context
 146                   "Select recipients for encryption.
 147 If no one is selected, symmetric encryption will be performed.  "
 148                   recipients)
 149                (if recipients
 150                    (mapcar
 151                     (lambda (recipient)
 152                       (setq recipient-key
 153                             (epa-mail--find-usable-key
 154                              (epg-list-keys
 155                               (epg-make-context epa-protocol)
 156                               (concat "<" recipient ">"))
 157                              'encrypt))
 158                       (unless (or recipient-key
 159                                   (y-or-n-p
 160                                    (format
 161                                     "No public key for %s; skip it? "
 162                                     recipient)))
 163                         (error "No public key for %s" recipient))
 164                       recipient-key)
 165                     recipients)))
 166              (setq sign (if verbose (y-or-n-p "Sign? ")))
 167              (if sign
 168                  (epa-select-keys context
 169                                   "Select keys for signing.  "))))))
 170   (epa-encrypt-region start end recipients sign signers))
 171
 172 ;;;###autoload
 173 (defun epa-mail-import-keys ()
 174   "Import keys in the OpenPGP armor format in the current buffer.
 175 The buffer is expected to contain a mail message.
 176
 177 Don't use this command in Lisp programs!"
 178   (interactive)
 179   (epa-import-armor-in-region (point-min) (point-max)))
 180
 181 ;;;###autoload
 182 (define-minor-mode epa-global-mail-mode
 183   "Minor mode to hook EasyPG into Mail mode."
 184   :global t :init-value nil :group 'epa-mail :version "23.1"
 185   (remove-hook 'mail-mode-hook 'epa-mail-mode)
 186   (if epa-global-mail-mode
 187       (add-hook 'mail-mode-hook 'epa-mail-mode)))
 188
 189 (provide 'epa-mail)
 190
 191 ;; arch-tag: a6f82b3f-d177-4a11-af95-040da55927d2
 192 ;;; epa-mail.el ends here