1 ;;; mml1991.el --- Old PGP message format (RFC 1991) support for MML
3 ;; Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004,
4 ;; 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
6 ;; Author: Sascha Ldecke <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/>.
31 (unless (fboundp 'declare-function) (defmacro declare-function (&rest r))))
39 (defvar mc-pgp-always-sign)
41 (autoload 'quoted-printable-decode-region "qp")
42 (autoload 'quoted-printable-encode-region "qp")
44 (autoload 'mm-decode-content-transfer-encoding "mm-bodies")
45 (autoload 'mm-encode-content-transfer-encoding "mm-bodies")
46 (autoload 'message-options-get "message")
47 (autoload 'message-options-set "message")
49 (defvar mml1991-use mml2015-use
50 "The package used for PGP.")
52 (defvar mml1991-function-alist
53 '((mailcrypt mml1991-mailcrypt-sign
54 mml1991-mailcrypt-encrypt)
61 "Alist of PGP functions.")
63 (defvar mml1991-verbose mml-secure-verbose
64 "If non-nil, ask the user about the current operation more verbosely.")
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.")
83 (autoload 'mc-sign-generic "mc-toplev"))
85 (defvar mml1991-decrypt-function 'mailcrypt-decrypt)
86 (defvar mml1991-verify-function 'mailcrypt-verify)
88 (defun mml1991-mailcrypt-sign (cont)
89 (let ((text (current-buffer))
91 (result-buffer (get-buffer-create "*GPG Result*")))
92 ;; Save MIME Content[^ ]+: headers from signing
93 (goto-char (point-min))
94 (while (looking-at "^Content[^ ]+:") (forward-line))
96 (setq headers (buffer-string))
97 (delete-region (point-min) (point)))
98 (goto-char (point-max))
101 (quoted-printable-decode-region (point-min) (point-max))
103 (setq signature (current-buffer))
104 (insert-buffer-substring text)
105 (unless (mc-sign-generic (message-options-get 'message-sender)
107 (unless (> (point-max) (point-min))
108 (pop-to-buffer result-buffer)
109 (error "Sign error")))
110 (goto-char (point-min))
111 (while (re-search-forward "\r+$" nil t)
112 (replace-match "" t t))
113 (quoted-printable-encode-region (point-min) (point-max))
115 (delete-region (point-min) (point-max))
116 (if headers (insert headers))
118 (insert-buffer-substring signature)
119 (goto-char (point-max)))))
121 (declare-function mc-encrypt-generic "ext:mc-toplev"
122 (&optional recipients scheme start end from sign))
124 (defun mml1991-mailcrypt-encrypt (cont &optional sign)
125 (let ((text (current-buffer))
127 (or mc-pgp-always-sign
129 (eq t (or (message-options-get 'message-sign-encrypt)
131 'message-sign-encrypt
132 (or (y-or-n-p "Sign the message? ")
136 (result-buffer (get-buffer-create "*GPG Result*")))
137 ;; Strip MIME Content[^ ]: headers since it will be ASCII ARMOURED
138 (goto-char (point-min))
139 (while (looking-at "^Content[^ ]+:") (forward-line))
141 (delete-region (point-min) (point)))
142 (mm-with-unibyte-current-buffer
144 (setq cipher (current-buffer))
145 (insert-buffer-substring text)
146 (unless (mc-encrypt-generic
148 (message-options-get 'message-recipients)
149 (message-options-set 'message-recipients
150 (read-string "Recipients: ")))
152 (point-min) (point-max)
153 (message-options-get 'message-sender)
155 (unless (> (point-max) (point-min))
156 (pop-to-buffer result-buffer)
157 (error "Encrypt error")))
158 (goto-char (point-min))
159 (while (re-search-forward "\r+$" 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))))))
172 (autoload 'gpg-sign-cleartext "gpg"))
174 (declare-function gpg-sign-encrypt "ext:gpg"
175 (plaintext ciphertext result recipients &optional
176 passphrase sign-with-key armor textmode))
177 (declare-function gpg-encrypt "ext:gpg"
178 (plaintext ciphertext result recipients &optional
179 passphrase armor textmode))
181 (defun mml1991-gpg-sign (cont)
182 (let ((text (current-buffer))
184 (result-buffer (get-buffer-create "*GPG Result*")))
185 ;; Save MIME Content[^ ]+: headers from signing
186 (goto-char (point-min))
187 (while (looking-at "^Content[^ ]+:") (forward-line))
189 (setq headers (buffer-string))
190 (delete-region (point-min) (point)))
191 (goto-char (point-max))
194 (quoted-printable-decode-region (point-min) (point-max))
196 (unless (gpg-sign-cleartext text (setq signature (current-buffer))
199 (message-options-get 'message-sender))
200 (unless (> (point-max) (point-min))
201 (pop-to-buffer result-buffer)
202 (error "Sign error")))
203 (goto-char (point-min))
204 (while (re-search-forward "\r+$" nil t)
205 (replace-match "" t t))
206 (quoted-printable-encode-region (point-min) (point-max))
208 (delete-region (point-min) (point-max))
209 (if headers (insert headers))
211 (insert-buffer-substring signature)
212 (goto-char (point-max)))))
214 (defun mml1991-gpg-encrypt (cont &optional sign)
215 (let ((text (current-buffer))
217 (result-buffer (get-buffer-create "*GPG Result*")))
218 ;; Strip MIME Content[^ ]: headers since it will be ASCII ARMOURED
219 (goto-char (point-min))
220 (while (looking-at "^Content[^ ]+:") (forward-line))
222 (delete-region (point-min) (point)))
223 (mm-with-unibyte-current-buffer
225 (flet ((gpg-encrypt-func
226 (sign plaintext ciphertext result recipients &optional
227 passphrase sign-with-key armor textmode)
230 plaintext ciphertext result recipients passphrase
231 sign-with-key armor textmode)
233 plaintext ciphertext result recipients passphrase
235 (unless (gpg-encrypt-func
237 text (setq cipher (current-buffer))
241 (message-options-get 'message-recipients)
242 (message-options-set 'message-recipients
243 (read-string "Recipients: ")))
246 (message-options-get 'message-sender)
247 t t) ; armor & textmode
248 (unless (> (point-max) (point-min))
249 (pop-to-buffer result-buffer)
250 (error "Encrypt error"))))
251 (goto-char (point-min))
252 (while (re-search-forward "\r+$" nil t)
253 (replace-match "" t t))
255 (delete-region (point-min) (point-max))
256 ;;(insert "Content-Type: application/pgp-encrypted\n\n")
257 ;;(insert "Version: 1\n\n")
259 (insert-buffer-substring cipher)
260 (goto-char (point-max))))))
264 (defvar pgg-default-user-id)
265 (defvar pgg-errors-buffer)
266 (defvar pgg-output-buffer)
268 (defun mml1991-pgg-sign (cont)
269 (let ((pgg-text-mode t)
270 (pgg-default-user-id (or (message-options-get 'mml-sender)
271 pgg-default-user-id))
273 ;; Don't sign headers.
274 (goto-char (point-min))
275 (when (re-search-forward "^$" nil t)
276 (setq headers (buffer-substring (point-min) (point)))
278 (narrow-to-region (point-min) (point))
279 (setq cte (mail-fetch-field "content-transfer-encoding")))
281 (delete-region (point-min) (point))
283 (setq cte (intern (downcase cte)))
284 (mm-decode-content-transfer-encoding cte)))
285 (unless (pgg-sign-region (point-min) (point-max) t)
286 (pop-to-buffer pgg-errors-buffer)
287 (error "Encrypt error"))
288 (delete-region (point-min) (point-max))
289 (mm-with-unibyte-current-buffer
290 (insert-buffer-substring pgg-output-buffer)
291 (goto-char (point-min))
292 (while (re-search-forward "\r+$" nil t)
293 (replace-match "" t t))
295 (mm-encode-content-transfer-encoding cte))
296 (goto-char (point-min))
302 (defun mml1991-pgg-encrypt (cont &optional sign)
303 (goto-char (point-min))
304 (when (re-search-forward "^$" nil t)
305 (let ((cte (save-restriction
306 (narrow-to-region (point-min) (point))
307 (mail-fetch-field "content-transfer-encoding"))))
308 ;; Strip MIME headers since it will be ASCII armoured.
310 (delete-region (point-min) (point))
312 (mm-decode-content-transfer-encoding (intern (downcase cte))))))
313 (unless (let ((pgg-text-mode t))
315 (point-min) (point-max)
318 (message-options-get 'message-recipients)
319 (message-options-set 'message-recipients
320 (read-string "Recipients: ")))
323 (pop-to-buffer pgg-errors-buffer)
324 (error "Encrypt error"))
325 (delete-region (point-min) (point-max))
327 (insert-buffer-substring pgg-output-buffer)
332 (defvar epg-user-id-alist)
333 (defvar password-cache-expiry)
336 (autoload 'epg-make-context "epg")
337 (autoload 'epg-passphrase-callback-function "epg")
338 (autoload 'epa-select-keys "epa")
339 (autoload 'epg-list-keys "epg")
340 (autoload 'epg-context-set-armor "epg")
341 (autoload 'epg-context-set-textmode "epg")
342 (autoload 'epg-context-set-signers "epg")
343 (autoload 'epg-context-set-passphrase-callback "epg")
344 (autoload 'epg-sign-string "epg")
345 (autoload 'epg-encrypt-string "epg")
346 (autoload 'epg-configuration "epg-config")
347 (autoload 'epg-expand-group "epg-config"))
349 (defvar mml1991-epg-secret-key-id-list nil)
351 (defun mml1991-epg-passphrase-callback (context key-id ignore)
353 (epg-passphrase-callback-function context key-id nil)
354 (let* ((entry (assoc key-id epg-user-id-alist))
357 (format "GnuPG passphrase for %s: "
365 (let ((password-cache-expiry mml1991-passphrase-cache-expiry))
366 (password-cache-add key-id passphrase))
367 (setq mml1991-epg-secret-key-id-list
368 (cons key-id mml1991-epg-secret-key-id-list))
369 (copy-sequence passphrase)))))
371 (defun mml1991-epg-sign (cont)
372 (let ((context (epg-make-context))
373 headers cte signers signature)
375 (setq signers (epa-select-keys context "Select keys for signing.
376 If no one is selected, default secret key is used. "
379 (setq signers (mapcar (lambda (name)
380 (car (epg-list-keys context name t)))
382 (epg-context-set-armor context t)
383 (epg-context-set-textmode context t)
384 (epg-context-set-signers context signers)
385 (if mml1991-cache-passphrase
386 (epg-context-set-passphrase-callback
388 #'mml1991-epg-passphrase-callback))
389 ;; Don't sign headers.
390 (goto-char (point-min))
391 (when (re-search-forward "^$" nil t)
392 (setq headers (buffer-substring (point-min) (point)))
394 (narrow-to-region (point-min) (point))
395 (setq cte (mail-fetch-field "content-transfer-encoding")))
397 (delete-region (point-min) (point))
399 (setq cte (intern (downcase cte)))
400 (mm-decode-content-transfer-encoding cte)))
401 (condition-case error
402 (setq signature (epg-sign-string context (buffer-string) 'clear)
403 mml1991-epg-secret-key-id-list nil)
405 (while mml1991-epg-secret-key-id-list
406 (password-cache-remove (car mml1991-epg-secret-key-id-list))
407 (setq mml1991-epg-secret-key-id-list
408 (cdr mml1991-epg-secret-key-id-list)))
409 (signal (car error) (cdr error))))
410 (delete-region (point-min) (point-max))
411 (mm-with-unibyte-current-buffer
413 (goto-char (point-min))
414 (while (re-search-forward "\r+$" nil t)
415 (replace-match "" t t))
417 (mm-encode-content-transfer-encoding cte))
418 (goto-char (point-min))
424 (defun mml1991-epg-encrypt (cont &optional sign)
425 (goto-char (point-min))
426 (when (re-search-forward "^$" nil t)
427 (let ((cte (save-restriction
428 (narrow-to-region (point-min) (point))
429 (mail-fetch-field "content-transfer-encoding"))))
430 ;; Strip MIME headers since it will be ASCII armoured.
432 (delete-region (point-min) (point))
434 (mm-decode-content-transfer-encoding (intern (downcase cte))))))
435 (let ((context (epg-make-context))
437 (if (message-options-get 'message-recipients)
439 (message-options-get 'message-recipients)
441 cipher signers config)
442 ;; We should remove this check if epg-0.0.6 is released.
443 (if (and (condition-case nil
444 (require 'epg-config)
446 (functionp #'epg-expand-group))
447 (setq config (epg-configuration)
450 (mapcar (lambda (recipient)
451 (or (epg-expand-group config recipient)
456 (epa-select-keys context "Select recipients for encryption.
457 If no one is selected, symmetric encryption will be performed. "
460 (delq nil (mapcar (lambda (name)
461 (car (epg-list-keys context name)))
463 (if mml1991-encrypt-to-self
467 (mapcar (lambda (name)
468 (car (epg-list-keys context name)))
470 (error "mml1991-signers not set")))
473 (setq signers (epa-select-keys context "Select keys for signing.
474 If no one is selected, default secret key is used. "
477 (setq signers (mapcar (lambda (name)
478 (car (epg-list-keys context name t)))
480 (epg-context-set-signers context signers))
481 (epg-context-set-armor context t)
482 (epg-context-set-textmode context t)
483 (if mml1991-cache-passphrase
484 (epg-context-set-passphrase-callback
486 #'mml1991-epg-passphrase-callback))
487 (condition-case error
489 (epg-encrypt-string context (buffer-string) recipients sign)
490 mml1991-epg-secret-key-id-list nil)
492 (while mml1991-epg-secret-key-id-list
493 (password-cache-remove (car mml1991-epg-secret-key-id-list))
494 (setq mml1991-epg-secret-key-id-list
495 (cdr mml1991-epg-secret-key-id-list)))
496 (signal (car error) (cdr error))))
497 (delete-region (point-min) (point-max))
498 (insert "\n" cipher))
502 (defun mml1991-encrypt (cont &optional sign)
503 (let ((func (nth 2 (assq mml1991-use mml1991-function-alist))))
505 (funcall func cont sign)
506 (error "Cannot find encrypt function"))))
509 (defun mml1991-sign (cont)
510 (let ((func (nth 1 (assq mml1991-use mml1991-function-alist))))
513 (error "Cannot find sign function"))))
518 ;; coding: iso-8859-1
521 ;; arch-tag: e542be18-ab28-4393-9b33-97fe9cf30706
522 ;;; mml1991.el ends here