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/>.
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)
66 "Alist of PGP functions.")
68 (defvar mml1991-cache-passphrase mml-secure-cache-passphrase
69 "If t, cache passphrase.")
71 (defvar mml1991-passphrase-cache-expiry mml-secure-passphrase-cache-expiry
72 "How many seconds the passphrase is cached.
73 Whether the passphrase is cached at all is controlled by
74 `mml1991-cache-passphrase'.")
76 (defvar mml1991-signers nil
77 "A list of your own key ID which will be used to sign a message.")
79 (defvar mml1991-encrypt-to-self nil
80 "If t, add your own key ID to recipient list when encryption.")
84 (autoload 'mc-sign-generic "mc-toplev")
86 (defvar mml1991-decrypt-function 'mailcrypt-decrypt)
87 (defvar mml1991-verify-function 'mailcrypt-verify)
89 (defun mml1991-mailcrypt-sign (cont)
90 (let ((text (current-buffer))
92 (result-buffer (get-buffer-create "*GPG Result*")))
93 ;; Save MIME Content[^ ]+: headers from signing
94 (goto-char (point-min))
95 (while (looking-at "^Content[^ ]+:") (forward-line))
97 (setq headers (buffer-string))
98 (delete-region (point-min) (point)))
99 (goto-char (point-max))
102 (quoted-printable-decode-region (point-min) (point-max))
104 (setq signature (current-buffer))
105 (insert-buffer-substring text)
106 (unless (mc-sign-generic (message-options-get 'message-sender)
108 (unless (> (point-max) (point-min))
109 (pop-to-buffer result-buffer)
110 (error "Sign error")))
111 (goto-char (point-min))
112 (while (re-search-forward "\r+$" nil t)
113 (replace-match "" t t))
114 (quoted-printable-encode-region (point-min) (point-max))
116 (delete-region (point-min) (point-max))
117 (if headers (insert headers))
119 (insert-buffer-substring signature)
120 (goto-char (point-max)))))
122 (declare-function mc-encrypt-generic "ext:mc-toplev"
123 (&optional recipients scheme start end from sign))
125 (defun mml1991-mailcrypt-encrypt (cont &optional sign)
126 (let ((text (current-buffer))
128 (or mc-pgp-always-sign
130 (eq t (or (message-options-get 'message-sign-encrypt)
132 'message-sign-encrypt
133 (or (y-or-n-p "Sign the message? ")
137 (result-buffer (get-buffer-create "*GPG Result*")))
138 ;; Strip MIME Content[^ ]: headers since it will be ASCII ARMORED
139 (goto-char (point-min))
140 (while (looking-at "^Content[^ ]+:") (forward-line))
142 (delete-region (point-min) (point)))
143 (mm-with-unibyte-current-buffer
145 (inline (mm-disable-multibyte))
146 (setq cipher (current-buffer))
147 (insert-buffer-substring text)
148 (unless (mc-encrypt-generic
150 (message-options-get 'message-recipients)
151 (message-options-set 'message-recipients
152 (read-string "Recipients: ")))
154 (point-min) (point-max)
155 (message-options-get 'message-sender)
157 (unless (> (point-max) (point-min))
158 (pop-to-buffer result-buffer)
159 (error "Encrypt error")))
160 (goto-char (point-min))
161 (while (re-search-forward "\r+$" nil t)
162 (replace-match "" t t))
164 (delete-region (point-min) (point-max))
165 ;;(insert "Content-Type: application/pgp-encrypted\n\n")
166 ;;(insert "Version: 1\n\n")
168 (insert-buffer-substring cipher)
169 (goto-char (point-max))))))
173 (autoload 'gpg-sign-cleartext "gpg")
175 (declare-function gpg-sign-encrypt "ext:gpg"
176 (plaintext ciphertext result recipients &optional
177 passphrase sign-with-key armor textmode))
178 (declare-function gpg-encrypt "ext:gpg"
179 (plaintext ciphertext result recipients &optional
180 passphrase armor textmode))
182 (defun mml1991-gpg-sign (cont)
183 (let ((text (current-buffer))
185 (result-buffer (get-buffer-create "*GPG Result*")))
186 ;; Save MIME Content[^ ]+: headers from signing
187 (goto-char (point-min))
188 (while (looking-at "^Content[^ ]+:") (forward-line))
190 (setq headers (buffer-string))
191 (delete-region (point-min) (point)))
192 (goto-char (point-max))
195 (quoted-printable-decode-region (point-min) (point-max))
197 (unless (gpg-sign-cleartext text (setq signature (current-buffer))
200 (message-options-get 'message-sender))
201 (unless (> (point-max) (point-min))
202 (pop-to-buffer result-buffer)
203 (error "Sign error")))
204 (goto-char (point-min))
205 (while (re-search-forward "\r+$" nil t)
206 (replace-match "" t t))
207 (quoted-printable-encode-region (point-min) (point-max))
209 (delete-region (point-min) (point-max))
210 (if headers (insert headers))
212 (insert-buffer-substring signature)
213 (goto-char (point-max)))))
215 (defun mml1991-gpg-encrypt (cont &optional sign)
216 (let ((text (current-buffer))
218 (result-buffer (get-buffer-create "*GPG Result*")))
219 ;; Strip MIME Content[^ ]: headers since it will be ASCII ARMORED
220 (goto-char (point-min))
221 (while (looking-at "^Content[^ ]+:") (forward-line))
223 (delete-region (point-min) (point)))
224 (mm-with-unibyte-current-buffer
226 (inline (mm-disable-multibyte))
227 (flet ((gpg-encrypt-func
228 (sign plaintext ciphertext result recipients &optional
229 passphrase sign-with-key armor textmode)
232 plaintext ciphertext result recipients passphrase
233 sign-with-key armor textmode)
235 plaintext ciphertext result recipients passphrase
237 (unless (gpg-encrypt-func
239 text (setq cipher (current-buffer))
243 (message-options-get 'message-recipients)
244 (message-options-set 'message-recipients
245 (read-string "Recipients: ")))
248 (message-options-get 'message-sender)
249 t t) ; armor & textmode
250 (unless (> (point-max) (point-min))
251 (pop-to-buffer result-buffer)
252 (error "Encrypt error"))))
253 (goto-char (point-min))
254 (while (re-search-forward "\r+$" nil t)
255 (replace-match "" t t))
257 (delete-region (point-min) (point-max))
258 ;;(insert "Content-Type: application/pgp-encrypted\n\n")
259 ;;(insert "Version: 1\n\n")
261 (insert-buffer-substring cipher)
262 (goto-char (point-max))))))
266 (defvar pgg-default-user-id)
267 (defvar pgg-errors-buffer)
268 (defvar pgg-output-buffer)
270 (defun mml1991-pgg-sign (cont)
271 (let ((pgg-text-mode t)
272 (pgg-default-user-id (or (message-options-get 'mml-sender)
273 pgg-default-user-id))
275 ;; Don't sign headers.
276 (goto-char (point-min))
277 (when (re-search-forward "^$" nil t)
278 (setq headers (buffer-substring (point-min) (point)))
280 (narrow-to-region (point-min) (point))
281 (setq cte (mail-fetch-field "content-transfer-encoding")))
283 (delete-region (point-min) (point))
285 (setq cte (intern (downcase cte)))
286 (mm-decode-content-transfer-encoding cte)))
287 (unless (pgg-sign-region (point-min) (point-max) t)
288 (pop-to-buffer pgg-errors-buffer)
289 (error "Encrypt error"))
290 (delete-region (point-min) (point-max))
291 (mm-with-unibyte-current-buffer
292 (insert-buffer-substring pgg-output-buffer)
293 (goto-char (point-min))
294 (while (re-search-forward "\r+$" nil t)
295 (replace-match "" t t))
297 (mm-encode-content-transfer-encoding cte))
298 (goto-char (point-min))
304 (defun mml1991-pgg-encrypt (cont &optional sign)
305 (goto-char (point-min))
306 (when (re-search-forward "^$" nil t)
307 (let ((cte (save-restriction
308 (narrow-to-region (point-min) (point))
309 (mail-fetch-field "content-transfer-encoding"))))
310 ;; Strip MIME headers since it will be ASCII armored.
312 (delete-region (point-min) (point))
314 (mm-decode-content-transfer-encoding (intern (downcase cte))))))
315 (unless (let ((pgg-text-mode t))
317 (point-min) (point-max)
320 (message-options-get 'message-recipients)
321 (message-options-set 'message-recipients
322 (read-string "Recipients: ")))
325 (pop-to-buffer pgg-errors-buffer)
326 (error "Encrypt error"))
327 (delete-region (point-min) (point-max))
329 (insert-buffer-substring pgg-output-buffer)
334 (defvar epg-user-id-alist)
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)
374 (if (eq mm-sign-option 'guided)
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 armored.
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)
454 (if (eq mm-encrypt-option 'guided)
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")))
472 (if (eq mm-sign-option 'guided)
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 ;;; mml1991.el ends here