1 ;;; pgg.el --- glue for the various PGP implementations.
3 ;; Copyright (C) 1999 Daiki Ueno
5 ;; Author: Daiki Ueno <ueno@ueda.info.waseda.ac.jp>
9 ;; This file is part of SEMI (Secure Emacs MIME Interface).
11 ;; This program is free software; you can redistribute it and/or
12 ;; modify it under the terms of the GNU General Public License as
13 ;; published by the Free Software Foundation; either version 2, or (at
14 ;; your option) any later version.
16 ;; This program is distributed in the hope that it will be useful, but
17 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 ;; General Public License for more details.
21 ;; You should have received a copy of the GNU General Public License
22 ;; along with GNU Emacs; see the file COPYING. If not, write to the
23 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
24 ;; Boston, MA 02111-1307, USA.
34 (eval-and-compile (require 'luna))
44 (in-calist-package 'pgg)
46 (defun pgg-field-match-method-with-containment
47 (calist field-type field-value)
48 (let ((s-field (assq field-type calist)))
50 (cons (cons field-type field-value) calist)
52 ((memq (cdr s-field) field-value)
55 (define-calist-field-match-method 'signature-version
56 #'pgg-field-match-method-with-containment)
58 (define-calist-field-match-method 'symmetric-key-algorithm
59 #'pgg-field-match-method-with-containment)
61 (define-calist-field-match-method 'public-key-algorithm
62 #'pgg-field-match-method-with-containment)
64 (define-calist-field-match-method 'hash-algorithm
65 #'pgg-field-match-method-with-containment)
67 (defvar pgg-verify-condition nil
68 "Condition-tree about which PGP implementation is used for verifying.")
70 (defvar pgg-decrypt-condition nil
71 "Condition-tree about which PGP implementation is used for decrypting.")
73 (ctree-set-calist-strictly
75 '((signature-version 3)(public-key-algorithm RSA)(hash-algorithm MD5)
78 (ctree-set-calist-strictly
79 'pgg-decrypt-condition
80 '((public-key-algorithm RSA)(symmetric-key-algorithm IDEA)
83 (ctree-set-calist-strictly
85 '((signature-version 3 4)
86 (public-key-algorithm RSA ELG DSA)
87 (hash-algorithm MD5 SHA1 RIPEMD160)
90 (ctree-set-calist-strictly
91 'pgg-decrypt-condition
92 '((public-key-algorithm RSA ELG DSA)
93 (symmetric-key-algorithm 3DES CAST5 IDEA)
96 (ctree-set-calist-strictly
98 '((signature-version 3 4)
99 (public-key-algorithm ELG-E DSA ELG)
100 (hash-algorithm MD5 SHA1 RIPEMD160)
103 (ctree-set-calist-strictly
104 'pgg-decrypt-condition
105 '((public-key-algorithm ELG-E DSA ELG)
106 (symmetric-key-algorithm 3DES CAST5 BLOWFISH TWOFISH)
109 ;;; @ definition of the implementation scheme
113 (luna-define-class pgg-scheme ())
115 (luna-define-internal-accessors 'pgg-scheme)
118 (luna-define-generic lookup-key-string (scheme string &optional type)
119 "Search keys associated with STRING")
121 (luna-define-generic encrypt-region (scheme start end recipients)
122 "Encrypt the current region between START and END.")
124 (luna-define-generic decrypt-region (scheme start end)
125 "Decrypt the current region between START and END.")
127 (luna-define-generic sign-region (scheme start end &optional cleartext)
128 "Make detached signature from text between START and END.")
130 (luna-define-generic verify-region (scheme start end &optional signature)
131 "Verify region between START and END
132 as the detached signature SIGNATURE.")
134 (luna-define-generic insert-key (scheme)
135 "Insert public key at point.")
137 (luna-define-generic snarf-keys-region (scheme start end)
138 "Add all public keys in region between START
139 and END to the keyring.")
141 ;;; @ interface functions
144 (defvar pgg-fetch-key-function (function pgg-fetch-key-with-w3))
146 (defmacro pgg-make-scheme (scheme)
148 (require (intern (format "pgg-%s" ,scheme)))
149 (funcall (intern (format "pgg-make-scheme-%s"
152 (put 'pgg-save-coding-system 'lisp-indent-function 2)
154 (defmacro pgg-save-coding-system (start end &rest body)
156 (let ((buffer (current-buffer)))
158 (let ((,start ,start) (,end ,end) buffer-undo-list)
159 (set-buffer-multibyte nil)
160 (insert-buffer-substring buffer ,start ,end)
161 (encode-coding-region (point-min)(point-max)
162 buffer-file-coding-system)
163 (setq ,start (point-min) ,end (point-max))
164 (prog1 (save-excursion ,@body)
165 (push nil buffer-undo-list)
166 (ignore-errors (undo)))
170 (defun pgg-display-output-buffer (start end status)
173 (delete-region start end)
174 (insert-buffer-substring pgg-output-buffer)
175 (decode-coding-region start (point)
176 buffer-file-coding-system)
178 (with-output-to-temp-buffer pgg-echo-buffer
179 (set-buffer standard-output)
180 (insert-buffer-substring pgg-errors-buffer)
184 (defun pgg-encrypt-region (start end rcpts)
185 "Encrypt the current region between START and END for RCPTS."
187 (list (region-beginning)(region-end)
188 (split-string (read-string "Recipients: ") "[ \t,]+")))
189 (let* ((entity (pgg-make-scheme pgg-default-scheme))
190 (status (pgg-save-coding-system start end
191 (luna-send entity 'encrypt-region entity
193 (when (interactive-p)
194 (pgg-display-output-buffer start end status))
198 (defun pgg-decrypt-region (start end)
199 "Decrypt the current region between START and END."
201 (let* ((packet (cdr (assq 1 (pgg-parse-armor-region start end))))
206 (in-calist-package 'pgg)
207 (ctree-match-calist pgg-decrypt-condition
210 (entity (pgg-make-scheme scheme))
211 (status (pgg-save-coding-system start end
212 (luna-send entity 'decrypt-region entity start end))))
213 (when (interactive-p)
214 (pgg-display-output-buffer start end status))
218 (defun pgg-sign-region (start end &optional cleartext)
219 "Make the signature from text between START and END.
220 If the optional 3rd argument CLEARTEXT is non-nil, it does not create
221 a detached signature."
223 (let* ((entity (pgg-make-scheme pgg-default-scheme))
224 (status (pgg-save-coding-system start end
225 (luna-send entity 'sign-region entity start end
226 (or (interactive-p) cleartext)))))
227 (when (interactive-p)
228 (pgg-display-output-buffer start end status))
232 (defun pgg-verify-region (start end &optional signature fetch)
233 "Verify the current region between START and END.
234 If the optional 3rd argument SIGNATURE is non-nil, it is treated as
235 the detached signature of the current region.
237 If the optional 4th argument FETCH is non-nil, we attempt to fetch the
238 signer's public key from `pgg-default-keyserver-address'."
241 (if (null signature) nil
243 (buffer-disable-undo)
244 (set-buffer-multibyte nil)
245 (insert-file-contents signature)
246 (cdr (assq 2 (pgg-decode-armor-region (point-min)(point-max))))
252 (in-calist-package 'pgg)
253 (ctree-match-calist pgg-verify-condition
256 (entity (pgg-make-scheme scheme))
257 (key (cdr (assq 'key-identifier packet)))
260 (setq key (concat "0x" (pgg-truncate-key-identifier key)))
261 (null (let ((pgg-scheme scheme))
262 (pgg-lookup-key-string key)))
263 (or fetch (interactive-p))
264 (y-or-n-p (format "Key %s not found; attempt to fetch? " key))
266 (or (cdr (assq 'preferred-key-server packet))
267 pgg-default-keyserver-address))
268 (pgg-fetch-key keyserver key))
269 (setq status (pgg-save-coding-system start end
270 (luna-send entity 'verify-region
271 entity start end signature)))
272 (when (interactive-p)
273 (with-output-to-temp-buffer pgg-echo-buffer
274 (set-buffer standard-output)
275 (insert-buffer-substring (if status pgg-output-buffer
281 (defun pgg-insert-key ()
282 "Insert the ASCII armored public key."
284 (let ((entity (pgg-make-scheme (or pgg-scheme pgg-default-scheme))))
285 (luna-send entity 'insert-key entity)))
288 (defun pgg-snarf-keys-region (start end)
289 "Import public keys in the current region between START and END."
291 (let ((entity (pgg-make-scheme (or pgg-scheme pgg-default-scheme))))
292 (pgg-save-coding-system start end
293 (luna-send entity 'snarf-keys-region entity start end))))
295 (defun pgg-lookup-key-string (string &optional type)
296 (let ((entity (pgg-make-scheme (or pgg-scheme pgg-default-scheme))))
297 (luna-send entity 'lookup-key-string entity string type)))
299 (defvar pgg-insert-url-function (function pgg-insert-url-with-w3))
301 (defun pgg-insert-url-with-w3 (url)
304 (let (buffer-file-name)
305 (url-insert-file-contents url)))
307 (defvar pgg-insert-url-extra-arguments nil)
308 (defvar pgg-insert-url-program nil)
310 (defun pgg-insert-url-with-program (url)
311 (let ((args (copy-sequence pgg-insert-url-extra-arguments))
316 (apply #'start-process " *PGG url*" (current-buffer)
317 pgg-insert-url-program (nconc args (list url))))
318 (set-process-sentinel process #'ignore)
319 (while (eq 'run (process-status process))
320 (accept-process-output process 5))
321 (delete-process process)
322 (if (and process (eq 'run (process-status process)))
323 (interrupt-process process))
327 (defun pgg-fetch-key (keyserver key)
328 "Attempt to fetch a KEY from KEYSERVER for addition to PGP or GnuPG keyring."
329 (with-current-buffer (get-buffer-create pgg-output-buffer)
330 (buffer-disable-undo)
332 (let ((proto (if (string-match "^[a-zA-Z\\+\\.\\\\-]+:" keyserver)
333 (substring keyserver 0 (1- (match-end 0))))))
335 (funcall pgg-insert-url-function
337 (format "http://%s:11371/pks/lookup?op=get&search=%s"
339 (when (re-search-forward "^-+BEGIN" nil 'last)
340 (delete-region (point-min) (match-beginning 0))
341 (when (re-search-forward "^-+END" nil t)
342 (delete-region (progn (end-of-line) (point))
346 (insert-buffer-substring pgg-output-buffer)
347 (pgg-snarf-keys-region (point-min)(point-max))))
351 ;;; @ utility functions
354 (defvar pgg-passphrase-cache-expiry 16)
355 (defvar pgg-passphrase-cache (make-vector 7 0))
357 (defvar pgg-read-passphrase nil)
358 (defun pgg-read-passphrase (prompt &optional key)
359 (if (not pgg-read-passphrase)
360 (if (functionp 'read-passwd)
361 (setq pgg-read-passphrase 'read-passwd)
362 (if (load "passwd" t)
363 (setq pgg-read-passphrase 'read-passwd)
364 (autoload 'ange-ftp-read-passwd "ange-ftp")
365 (setq pgg-read-passphrase 'ange-ftp-read-passwd))))
366 (or (and key (setq key (pgg-truncate-key-identifier key))
367 (symbol-value (intern-soft key pgg-passphrase-cache)))
368 (funcall pgg-read-passphrase prompt)))
370 (defun pgg-add-passphrase-cache (key passphrase)
371 (setq key (pgg-truncate-key-identifier key))
372 (set (intern key pgg-passphrase-cache)
374 (run-at-time pgg-passphrase-cache-expiry nil
375 #'pgg-remove-passphrase-cache
378 (defun pgg-remove-passphrase-cache (key)
379 (unintern key pgg-passphrase-cache))
381 (defmacro pgg-convert-lbt-region (start end lbt)
382 `(let ((pgg-conversion-end (set-marker (make-marker) ,end)))
388 (> (marker-position pgg-conversion-end) (point)))
392 (while (re-search-forward "\r$" pgg-conversion-end t)
393 (replace-match ""))))
396 (put 'pgg-as-lbt 'lisp-indent-function 3)
398 (defmacro pgg-as-lbt (start end lbt &rest body)
399 `(let ((inhibit-read-only t)
402 (pgg-convert-lbt-region ,start ,end ,lbt)
403 (let ((,end (point)))
405 (push nil buffer-undo-list)
406 (ignore-errors (undo))))
409 ;;; @ postprocess macros
412 (put 'pgg-process-when-success 'lisp-indent-function 0)
414 (defmacro pgg-process-when-success (&rest body)
415 `(with-current-buffer pgg-output-buffer
416 (if (zerop (buffer-size)) nil ,@body t)))