1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
|
;;; epa-mail.el --- the EasyPG Assistant, minor-mode for mail composer -*- lexical-binding: t -*-
;; Copyright (C) 2006-2014 Free Software Foundation, Inc.
;; Author: Daiki Ueno <ueno@unixuser.org>
;; Keywords: PGP, GnuPG, mail, message
;; Package: epa
;; This file is part of GNU Emacs.
;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
;;; Code:
(require 'epa)
(require 'mail-utils)
(defvar epa-mail-mode-map
(let ((keymap (make-sparse-keymap)))
(define-key keymap "\C-c\C-ed" 'epa-mail-decrypt)
(define-key keymap "\C-c\C-ev" 'epa-mail-verify)
(define-key keymap "\C-c\C-es" 'epa-mail-sign)
(define-key keymap "\C-c\C-ee" 'epa-mail-encrypt)
(define-key keymap "\C-c\C-ei" 'epa-mail-import-keys)
(define-key keymap "\C-c\C-eo" 'epa-insert-keys)
(define-key keymap "\C-c\C-e\C-d" 'epa-mail-decrypt)
(define-key keymap "\C-c\C-e\C-v" 'epa-mail-verify)
(define-key keymap "\C-c\C-e\C-s" 'epa-mail-sign)
(define-key keymap "\C-c\C-e\C-e" 'epa-mail-encrypt)
(define-key keymap "\C-c\C-e\C-i" 'epa-mail-import-keys)
(define-key keymap "\C-c\C-e\C-o" 'epa-insert-keys)
keymap))
(defvar epa-mail-mode-hook nil)
(defvar epa-mail-mode-on-hook nil)
(defvar epa-mail-mode-off-hook nil)
;;;###autoload
(define-minor-mode epa-mail-mode
"A minor-mode for composing encrypted/clearsigned mails.
With a prefix argument ARG, enable the mode if ARG is positive,
and disable it otherwise. If called from Lisp, enable the mode
if ARG is omitted or nil."
nil " epa-mail" epa-mail-mode-map)
(defun epa-mail--find-usable-key (keys usage)
"Find a usable key from KEYS for USAGE.
USAGE would be `sign' or `encrypt'."
(catch 'found
(while keys
(let ((pointer (epg-key-sub-key-list (car keys))))
(while pointer
(if (and (memq usage (epg-sub-key-capability (car pointer)))
(not (memq (epg-sub-key-validity (car pointer))
'(revoked expired))))
(throw 'found (car keys)))
(setq pointer (cdr pointer))))
(setq keys (cdr keys)))))
;;;###autoload
(defun epa-mail-decrypt ()
"Decrypt OpenPGP armors in the current buffer.
The buffer is expected to contain a mail message.
Don't use this command in Lisp programs!"
(interactive)
(epa-decrypt-armor-in-region (point-min) (point-max)))
;;;###autoload
(defun epa-mail-verify ()
"Verify OpenPGP cleartext signed messages in the current buffer.
The buffer is expected to contain a mail message.
Don't use this command in Lisp programs!"
(interactive)
(epa-verify-cleartext-in-region (point-min) (point-max)))
;;;###autoload
(defun epa-mail-sign (start end signers mode)
"Sign the current buffer.
The buffer is expected to contain a mail message.
Don't use this command in Lisp programs!"
(interactive
(save-excursion
(goto-char (point-min))
(if (search-forward mail-header-separator nil t)
(forward-line))
(setq epa-last-coding-system-specified
(or coding-system-for-write
(epa--select-safe-coding-system (point) (point-max))))
(let ((verbose current-prefix-arg))
(list (point) (point-max)
(if verbose
(epa-select-keys (epg-make-context epa-protocol)
"Select keys for signing.
If no one is selected, default secret key is used. "
nil t))
(if verbose
(epa--read-signature-type)
'clear)))))
(let ((inhibit-read-only t))
(epa-sign-region start end signers mode)))
(defun epa-mail-default-recipients ()
"Return the default list of encryption recipients for a mail buffer."
(let ((config (epg-configuration))
recipients-string real-recipients)
(save-excursion
(goto-char (point-min))
(save-restriction
(narrow-to-region (point)
(if (search-forward mail-header-separator nil 0)
(match-beginning 0)
(point)))
(setq recipients-string
(mapconcat #'identity
(nconc (mail-fetch-field "to" nil nil t)
(mail-fetch-field "cc" nil nil t)
(mail-fetch-field "bcc" nil nil t))
","))
(setq recipients-string
(mail-strip-quoted-names
(with-temp-buffer
(insert "to: " recipients-string "\n")
(expand-mail-aliases (point-min) (point-max))
(car (mail-fetch-field "to" nil nil t))))))
(setq real-recipients
(split-string recipients-string "," t "[ \t\n]*"))
;; Process all the recipients thru the list of GnuPG groups.
;; Expand GnuPG group names to what they stand for.
(setq real-recipients
(apply #'nconc
(mapcar
(lambda (recipient)
(or (epg-expand-group config recipient)
(list recipient)))
real-recipients)))
;; Process all the recipients thru the user's list
;; of encryption aliases.
(setq real-recipients
(apply #'nconc
(mapcar
(lambda (recipient)
(let ((tem (assoc recipient epa-mail-aliases)))
(if tem (cdr tem)
(list recipient))))
real-recipients)))
)))
;;;###autoload
(defun epa-mail-encrypt (&optional recipients signers)
"Encrypt the outgoing mail message in the current buffer.
Takes the recipients from the text in the header in the buffer
and translates them through `epa-mail-aliases'.
With prefix argument, asks you to select among them interactively
and also whether and how to sign.
Called from Lisp, the optional argument RECIPIENTS is a list
of recipient addresses, t to perform symmetric encryption,
or nil meaning use the defaults.
SIGNERS is a list of keys to sign the message with."
(interactive
(let ((verbose current-prefix-arg)
(context (epg-make-context epa-protocol)))
(list (if verbose
(or (epa-select-keys
context
"Select recipients for encryption.
If no one is selected, symmetric encryption will be performed. "
(epa-mail-default-recipients))
t))
(and verbose (y-or-n-p "Sign? ")
(epa-select-keys context
"Select keys for signing. ")))))
(let (start recipient-keys default-recipients)
(save-excursion
(setq recipient-keys
(cond ((eq recipients t)
nil)
(recipients recipients)
(t
(setq default-recipients
(epa-mail-default-recipients))
;; Convert recipients to keys.
(apply
'nconc
(mapcar
(lambda (recipient)
(let ((recipient-key
(epa-mail--find-usable-key
(epg-list-keys
(epg-make-context epa-protocol)
(if (string-match "@" recipient)
(concat "<" recipient ">")
recipient))
'encrypt)))
(unless (or recipient-key
(y-or-n-p
(format
"No public key for %s; skip it? "
recipient)))
(error "No public key for %s" recipient))
(if recipient-key (list recipient-key))))
default-recipients)))))
(goto-char (point-min))
(if (search-forward mail-header-separator nil t)
(forward-line))
(setq start (point))
(setq epa-last-coding-system-specified
(or coding-system-for-write
(epa--select-safe-coding-system (point) (point-max)))))
;; Don't let some read-only text stop us from encrypting.
(let ((inhibit-read-only t))
(epa-encrypt-region start (point-max) recipient-keys signers signers))))
;;;###autoload
(defun epa-mail-import-keys ()
"Import keys in the OpenPGP armor format in the current buffer.
The buffer is expected to contain a mail message.
Don't use this command in Lisp programs!"
(interactive)
(epa-import-armor-in-region (point-min) (point-max)))
;;;###autoload
(define-minor-mode epa-global-mail-mode
"Minor mode to hook EasyPG into Mail mode.
With a prefix argument ARG, enable the mode if ARG is positive,
and disable it otherwise. If called from Lisp, enable the mode
if ARG is omitted or nil."
:global t :init-value nil :group 'epa-mail :version "23.1"
(remove-hook 'mail-mode-hook 'epa-mail-mode)
(if epa-global-mail-mode
(add-hook 'mail-mode-hook 'epa-mail-mode)))
(provide 'epa-mail)
;;; epa-mail.el ends here
|
