1 ;;; mml1991.el --- Old PGP message format (RFC 1991) support for MML
3 ;; Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
4 ;; 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
6 ;; Author: Sascha Lüdecke <sascha@meta-x.de>,
7 ;; Simon Josefsson <simon@josefsson.org> (Mailcrypt interface, Gnus glue)
10 ;; This file is part of GNU Emacs.
12 ;; GNU Emacs is free software: you can redistribute it and/or modify
13 ;; it under the terms of the GNU General Public License as published by
14 ;; the Free Software Foundation, either version 3 of the License, or
15 ;; (at your option) any later version.
17 ;; GNU Emacs is distributed in the hope that it will be useful,
18 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 ;; GNU General Public License for more details.
22 ;; You should have received a copy of the GNU General Public License
23 ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
30 ;; For Emacs <22.2 and XEmacs.
31 (unless (fboundp 'declare-function) (defmacro declare-function (&rest r)))
33 (if (locate-library "password-cache")
34 (require 'password-cache)
44 (defvar mc-pgp-always-sign)
46 (autoload 'quoted-printable-decode-region "qp")
47 (autoload 'quoted-printable-encode-region "qp")
49 (autoload 'mm-decode-content-transfer-encoding "mm-bodies")
50 (autoload 'mm-encode-content-transfer-encoding "mm-bodies")
51 (autoload 'message-options-get "message")
52 (autoload 'message-options-set "message")
54 (defvar mml1991-use mml2015-use
55 "The package used for PGP.")
57 (defvar mml1991-function-alist
58 '((mailcrypt mml1991-mailcrypt-sign
59 mml1991-mailcrypt-encrypt)
64 "Alist of PGP functions.")
66 (defvar mml1991-cache-passphrase mml-secure-cache-passphrase
67 "If t, cache passphrase.")
69 (defvar mml1991-passphrase-cache-expiry mml-secure-passphrase-cache-expiry
70 "How many seconds the passphrase is cached.
71 Whether the passphrase is cached at all is controlled by
72 `mml1991-cache-passphrase'.")
74 (defvar mml1991-signers nil
75 "A list of your own key ID which will be used to sign a message.")
77 (defvar mml1991-encrypt-to-self nil
78 "If t, add your own key ID to recipient list when encryption.")
82 (autoload 'mc-sign-generic "mc-toplev")
84 (defvar mml1991-decrypt-function 'mailcrypt-decrypt)
85 (defvar mml1991-verify-function 'mailcrypt-verify)
87 (defun mml1991-mailcrypt-sign (cont)
88 (let ((text (current-buffer))
90 (result-buffer (get-buffer-create "*GPG Result*")))
91 ;; Save MIME Content[^ ]+: headers from signing
92 (goto-char (point-min))
93 (while (looking-at "^Content[^ ]+:") (forward-line))
95 (setq headers (buffer-string))
96 (delete-region (point-min) (point)))
97 (goto-char (point-max))
100 (quoted-printable-decode-region (point-min) (point-max))
102 (setq signature (current-buffer))
103 (insert-buffer-substring text)
104 (unless (mc-sign-generic (message-options-get 'message-sender)
106 (unless (> (point-max) (point-min))
107 (pop-to-buffer result-buffer)
108 (error "Sign error")))
109 (goto-char (point-min))
110 (while (re-search-forward "\r+$" nil t)
111 (replace-match "" t t))
112 (quoted-printable-encode-region (point-min) (point-max))
114 (delete-region (point-min) (point-max))
115 (if headers (insert headers))
117 (insert-buffer-substring signature)
118 (goto-char (point-max)))))
120 (declare-function mc-encrypt-generic "ext:mc-toplev"
121 (&optional recipients scheme start end from sign))
123 (defun mml1991-mailcrypt-encrypt (cont &optional sign)
124 (let ((text (current-buffer))
126 (or mc-pgp-always-sign
128 (eq t (or (message-options-get 'message-sign-encrypt)
130 'message-sign-encrypt
131 (or (y-or-n-p "Sign the message? ")
135 (result-buffer (get-buffer-create "*GPG Result*")))
136 ;; Strip MIME Content[^ ]: headers since it will be ASCII ARMORED
137 (goto-char (point-min))
138 (while (looking-at "^Content[^ ]+:") (forward-line))
140 (delete-region (point-min) (point)))
141 (mm-with-unibyte-current-buffer
143 (inline (mm-disable-multibyte))
144 (setq cipher (current-buffer))
145 (insert-buffer-substring text)
146 (unless (mc-encrypt-generic
148 (message-options-get 'message-recipients)
149 (message-options-set 'message-recipients
150 (read-string "Recipients: ")))
152 (point-min) (point-max)
153 (message-options-get 'message-sender)
155 (unless (> (point-max) (point-min))
156 (pop-to-buffer result-buffer)
157 (error "Encrypt error")))
158 (goto-char (point-min))
159 (while (re-search-forward "\r+$" nil t)
160 (replace-match "" t t))
162 (delete-region (point-min) (point-max))
163 ;;(insert "Content-Type: application/pgp-encrypted\n\n")
164 ;;(insert "Version: 1\n\n")
166 (insert-buffer-substring cipher)
167 (goto-char (point-max))))))
171 (defvar pgg-default-user-id)
172 (defvar pgg-errors-buffer)
173 (defvar pgg-output-buffer)
175 (defun mml1991-pgg-sign (cont)
176 (let ((pgg-text-mode t)
177 (pgg-default-user-id (or (message-options-get 'mml-sender)
178 pgg-default-user-id))
180 ;; Don't sign headers.
181 (goto-char (point-min))
182 (when (re-search-forward "^$" nil t)
183 (setq headers (buffer-substring (point-min) (point)))
185 (narrow-to-region (point-min) (point))
186 (setq cte (mail-fetch-field "content-transfer-encoding")))
188 (delete-region (point-min) (point))
190 (setq cte (intern (downcase cte)))
191 (mm-decode-content-transfer-encoding cte)))
192 (unless (pgg-sign-region (point-min) (point-max) t)
193 (pop-to-buffer pgg-errors-buffer)
194 (error "Encrypt error"))
195 (delete-region (point-min) (point-max))
196 (mm-with-unibyte-current-buffer
197 (insert-buffer-substring pgg-output-buffer)
198 (goto-char (point-min))
199 (while (re-search-forward "\r+$" nil t)
200 (replace-match "" t t))
202 (mm-encode-content-transfer-encoding cte))
203 (goto-char (point-min))
209 (defun mml1991-pgg-encrypt (cont &optional sign)
210 (goto-char (point-min))
211 (when (re-search-forward "^$" nil t)
212 (let ((cte (save-restriction
213 (narrow-to-region (point-min) (point))
214 (mail-fetch-field "content-transfer-encoding"))))
215 ;; Strip MIME headers since it will be ASCII armored.
217 (delete-region (point-min) (point))
219 (mm-decode-content-transfer-encoding (intern (downcase cte))))))
220 (unless (let ((pgg-text-mode t))
222 (point-min) (point-max)
225 (message-options-get 'message-recipients)
226 (message-options-set 'message-recipients
227 (read-string "Recipients: ")))
230 (pop-to-buffer pgg-errors-buffer)
231 (error "Encrypt error"))
232 (delete-region (point-min) (point-max))
234 (insert-buffer-substring pgg-output-buffer)
239 (defvar epg-user-id-alist)
241 (autoload 'epg-make-context "epg")
242 (autoload 'epg-passphrase-callback-function "epg")
243 (autoload 'epa-select-keys "epa")
244 (autoload 'epg-list-keys "epg")
245 (autoload 'epg-context-set-armor "epg")
246 (autoload 'epg-context-set-textmode "epg")
247 (autoload 'epg-context-set-signers "epg")
248 (autoload 'epg-context-set-passphrase-callback "epg")
249 (autoload 'epg-sign-string "epg")
250 (autoload 'epg-encrypt-string "epg")
251 (autoload 'epg-configuration "epg-config")
252 (autoload 'epg-expand-group "epg-config")
254 (defvar mml1991-epg-secret-key-id-list nil)
256 (defun mml1991-epg-passphrase-callback (context key-id ignore)
258 (epg-passphrase-callback-function context key-id nil)
259 (let* ((entry (assoc key-id epg-user-id-alist))
262 (format "GnuPG passphrase for %s: "
270 (let ((password-cache-expiry mml1991-passphrase-cache-expiry))
271 (password-cache-add key-id passphrase))
272 (setq mml1991-epg-secret-key-id-list
273 (cons key-id mml1991-epg-secret-key-id-list))
274 (copy-sequence passphrase)))))
276 (defun mml1991-epg-sign (cont)
277 (let ((context (epg-make-context))
278 headers cte signers signature)
279 (if (eq mm-sign-option 'guided)
280 (setq signers (epa-select-keys context "Select keys for signing.
281 If no one is selected, default secret key is used. "
284 (setq signers (mapcar (lambda (name)
285 (car (epg-list-keys context name t)))
287 (epg-context-set-armor context t)
288 (epg-context-set-textmode context t)
289 (epg-context-set-signers context signers)
290 (if mml1991-cache-passphrase
291 (epg-context-set-passphrase-callback
293 #'mml1991-epg-passphrase-callback))
294 ;; Don't sign headers.
295 (goto-char (point-min))
296 (when (re-search-forward "^$" nil t)
297 (setq headers (buffer-substring (point-min) (point)))
299 (narrow-to-region (point-min) (point))
300 (setq cte (mail-fetch-field "content-transfer-encoding")))
302 (delete-region (point-min) (point))
304 (setq cte (intern (downcase cte)))
305 (mm-decode-content-transfer-encoding cte)))
306 (condition-case error
307 (setq signature (epg-sign-string context (buffer-string) 'clear)
308 mml1991-epg-secret-key-id-list nil)
310 (while mml1991-epg-secret-key-id-list
311 (password-cache-remove (car mml1991-epg-secret-key-id-list))
312 (setq mml1991-epg-secret-key-id-list
313 (cdr mml1991-epg-secret-key-id-list)))
314 (signal (car error) (cdr error))))
315 (delete-region (point-min) (point-max))
316 (mm-with-unibyte-current-buffer
318 (goto-char (point-min))
319 (while (re-search-forward "\r+$" nil t)
320 (replace-match "" t t))
322 (mm-encode-content-transfer-encoding cte))
323 (goto-char (point-min))
329 (defun mml1991-epg-encrypt (cont &optional sign)
330 (goto-char (point-min))
331 (when (re-search-forward "^$" nil t)
332 (let ((cte (save-restriction
333 (narrow-to-region (point-min) (point))
334 (mail-fetch-field "content-transfer-encoding"))))
335 ;; Strip MIME headers since it will be ASCII armored.
337 (delete-region (point-min) (point))
339 (mm-decode-content-transfer-encoding (intern (downcase cte))))))
340 (let ((context (epg-make-context))
342 (if (message-options-get 'message-recipients)
344 (message-options-get 'message-recipients)
346 cipher signers config)
347 ;; We should remove this check if epg-0.0.6 is released.
348 (if (and (condition-case nil
349 (require 'epg-config)
351 (functionp #'epg-expand-group))
352 (setq config (epg-configuration)
355 (mapcar (lambda (recipient)
356 (or (epg-expand-group config recipient)
359 (if (eq mm-encrypt-option 'guided)
361 (epa-select-keys context "Select recipients for encryption.
362 If no one is selected, symmetric encryption will be performed. "
365 (delq nil (mapcar (lambda (name)
366 (car (epg-list-keys context name)))
368 (if mml1991-encrypt-to-self
372 (mapcar (lambda (name)
373 (car (epg-list-keys context name)))
375 (error "mml1991-signers not set")))
377 (if (eq mm-sign-option 'guided)
378 (setq signers (epa-select-keys context "Select keys for signing.
379 If no one is selected, default secret key is used. "
382 (setq signers (mapcar (lambda (name)
383 (car (epg-list-keys context name t)))
385 (epg-context-set-signers context signers))
386 (epg-context-set-armor context t)
387 (epg-context-set-textmode context t)
388 (if mml1991-cache-passphrase
389 (epg-context-set-passphrase-callback
391 #'mml1991-epg-passphrase-callback))
392 (condition-case error
394 (epg-encrypt-string context (buffer-string) recipients sign)
395 mml1991-epg-secret-key-id-list nil)
397 (while mml1991-epg-secret-key-id-list
398 (password-cache-remove (car mml1991-epg-secret-key-id-list))
399 (setq mml1991-epg-secret-key-id-list
400 (cdr mml1991-epg-secret-key-id-list)))
401 (signal (car error) (cdr error))))
402 (delete-region (point-min) (point-max))
403 (insert "\n" cipher))
407 (defun mml1991-encrypt (cont &optional sign)
408 (let ((func (nth 2 (assq mml1991-use mml1991-function-alist))))
410 (funcall func cont sign)
411 (error "Cannot find encrypt function"))))
414 (defun mml1991-sign (cont)
415 (let ((func (nth 1 (assq mml1991-use mml1991-function-alist))))
418 (error "Cannot find sign function"))))
423 ;; coding: iso-8859-1
426 ;;; mml1991.el ends here