[bpt/emacs.git] / lisp / pgg-pgp.el

;;; pgg-pgp.el --- PGP 2.* and 6.* support for PGG.

;; Copyright (C) 1999, 2000, 2002, 2003, 2004,
;;   2005 Free Software Foundation, Inc.

;; Author: Daiki Ueno <ueno@unixuser.org>
;; Created: 1999/11/02
;; Keywords: PGP, OpenPGP

;; 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 2, 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; see the file COPYING.  If not, write to the
;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.

;;; Code:

(eval-when-compile
  (require 'cl)				; for pgg macros
  (require 'pgg))

(defgroup pgg-pgp ()
  "PGP 2.* and 6.* interface."
  :group 'pgg)

(defcustom pgg-pgp-program "pgp"
  "PGP 2.* and 6.* executable."
  :group 'pgg-pgp
  :type 'string)

(defcustom pgg-pgp-shell-file-name "/bin/sh"
  "File name to load inferior shells from.
Bourne shell or its equivalent \(not tcsh) is needed for \"2>\"."
  :group 'pgg-pgp
  :type 'string)

(defcustom pgg-pgp-shell-command-switch "-c"
  "Switch used to have the shell execute its command line argument."
  :group 'pgg-pgp
  :type 'string)

(defcustom pgg-pgp-extra-args nil
  "Extra arguments for every PGP invocation."
  :group 'pgg-pgp
  :type '(choice
	  (const :tag "None" nil)
	  (string :tag "Arguments")))

(defvar pgg-pgp-user-id nil
  "PGP ID of your default identity.")

(defun pgg-pgp-process-region (start end passphrase program args)
  (let* ((errors-file-name (pgg-make-temp-file "pgg-errors"))
	 (args
	  (append args
		  pgg-pgp-extra-args
		  (list (concat "2>" errors-file-name))))
	 (shell-file-name pgg-pgp-shell-file-name)
	 (shell-command-switch pgg-pgp-shell-command-switch)
	 (process-environment process-environment)
	 (output-buffer pgg-output-buffer)
	 (errors-buffer pgg-errors-buffer)
	 (process-connection-type nil)
	 process status exit-status)
    (with-current-buffer (get-buffer-create output-buffer)
      (buffer-disable-undo)
      (erase-buffer))
    (when passphrase
      (setenv "PGPPASSFD" "0"))
    (unwind-protect
	(progn
	  (let ((coding-system-for-read 'binary)
		(coding-system-for-write 'binary))
	    (setq process
		  (apply #'funcall
			 #'start-process-shell-command "*PGP*" output-buffer
			 program args)))
	  (set-process-sentinel process #'ignore)
	  (when passphrase
	    (process-send-string process (concat passphrase "\n")))
	  (process-send-region process start end)
	  (process-send-eof process)
	  (while (eq 'run (process-status process))
	    (accept-process-output process 5))
	  (setq status (process-status process)
		exit-status (process-exit-status process))
	  (delete-process process)
	  (with-current-buffer output-buffer
	    (pgg-convert-lbt-region (point-min)(point-max) 'LF)

	    (if (memq status '(stop signal))
		(error "%s exited abnormally: '%s'" program exit-status))
	    (if (= 127 exit-status)
		(error "%s could not be found" program))

	    (set-buffer (get-buffer-create errors-buffer))
	    (buffer-disable-undo)
	    (erase-buffer)
	    (insert-file-contents errors-file-name)))
      (if (and process (eq 'run (process-status process)))
	  (interrupt-process process))
      (condition-case nil
	  (delete-file errors-file-name)
	(file-error nil)))))

(defun pgg-pgp-lookup-key (string &optional type)
  "Search keys associated with STRING."
  (let ((args (list "+batchmode" "+language=en" "-kv" string)))
    (with-current-buffer (get-buffer-create pgg-output-buffer)
      (buffer-disable-undo)
      (erase-buffer)
      (apply #'call-process pgg-pgp-program nil t nil args)
      (goto-char (point-min))
      (cond
       ((re-search-forward "^pub\\s +[0-9]+/" nil t);PGP 2.*
	(buffer-substring (point)(+ 8 (point))))
       ((re-search-forward "^Type" nil t);PGP 6.*
	(beginning-of-line 2)
	(substring
	 (nth 2 (split-string
		 (buffer-substring (point)(progn (end-of-line) (point)))))
	 2))))))

(defun pgg-pgp-encrypt-region (start end recipients)
  "Encrypt the current region between START and END."
  (let* ((pgg-pgp-user-id (or pgg-pgp-user-id pgg-default-user-id))
	 (args
	  `("+encrypttoself=off +verbose=1" "+batchmode"
	    "+language=us" "-fate"
	    ,@(if recipients
		  (mapcar (lambda (rcpt) (concat "\"" rcpt "\""))
			  (append recipients
				  (if pgg-encrypt-for-me
				      (list pgg-pgp-user-id))))))))
    (pgg-pgp-process-region start end nil pgg-pgp-program args)
    (pgg-process-when-success nil)))

(defun pgg-pgp-decrypt-region (start end)
  "Decrypt the current region between START and END."
  (let* ((pgg-pgp-user-id (or pgg-pgp-user-id pgg-default-user-id))
	 (key (pgg-pgp-lookup-key pgg-pgp-user-id 'encrypt))
	 (passphrase
	  (pgg-read-passphrase
	   (format "PGP passphrase for %s: " pgg-pgp-user-id) key))
	 (args
	  '("+verbose=1" "+batchmode" "+language=us" "-f")))
    (pgg-pgp-process-region start end passphrase pgg-pgp-program args)
    (pgg-process-when-success
      (if pgg-cache-passphrase
	  (pgg-add-passphrase-cache key passphrase)))))

(defun pgg-pgp-sign-region (start end &optional clearsign)
  "Make detached signature from text between START and END."
  (let* ((pgg-pgp-user-id (or pgg-pgp-user-id pgg-default-user-id))
	 (passphrase
	  (pgg-read-passphrase
	   (format "PGP passphrase for %s: " pgg-pgp-user-id)
	   (pgg-pgp-lookup-key pgg-pgp-user-id 'sign)))
	 (args
	  (list (if clearsign "-fast" "-fbast")
		"+verbose=1" "+language=us" "+batchmode"
		"-u" pgg-pgp-user-id)))
    (pgg-pgp-process-region start end passphrase pgg-pgp-program args)
    (pgg-process-when-success
      (goto-char (point-min))
      (when (re-search-forward "^-+BEGIN PGP" nil t);XXX
	(let ((packet
	       (cdr (assq 2 (pgg-parse-armor-region
			     (progn (beginning-of-line 2)
				    (point))
			     (point-max))))))
	  (if pgg-cache-passphrase
	      (pgg-add-passphrase-cache
	       (cdr (assq 'key-identifier packet))
	       passphrase)))))))

(defun pgg-pgp-verify-region (start end &optional signature)
  "Verify region between START and END as the detached signature SIGNATURE."
  (let* ((orig-file (pgg-make-temp-file "pgg"))
	 (args '("+verbose=1" "+batchmode" "+language=us"))
	 (orig-mode (default-file-modes)))
    (unwind-protect
	(progn
	  (set-default-file-modes 448)
	  (let ((coding-system-for-write 'binary)
		jka-compr-compression-info-list jam-zcat-filename-list)
	    (write-region start end orig-file)))
      (set-default-file-modes orig-mode))
    (if (stringp signature)
	(progn
	  (copy-file signature (setq signature (concat orig-file ".asc")))
	  (setq args (append args (list signature orig-file))))
      (setq args (append args (list orig-file))))
    (pgg-pgp-process-region (point)(point) nil pgg-pgp-program args)
    (delete-file orig-file)
    (if signature (delete-file signature))
    (pgg-process-when-success
      (goto-char (point-min))
      (let ((case-fold-search t))
	(while (re-search-forward "^warning: " nil t)
	  (delete-region (match-beginning 0)
			 (progn (beginning-of-line 2) (point)))))
      (goto-char (point-min))
      (when (re-search-forward "^\\.$" nil t)
	(delete-region (point-min)
		       (progn (beginning-of-line 2)
			      (point)))))))

(defun pgg-pgp-insert-key ()
  "Insert public key at point."
  (let* ((pgg-pgp-user-id (or pgg-pgp-user-id pgg-default-user-id))
	 (args
	  (list "+verbose=1" "+batchmode" "+language=us" "-kxaf"
		(concat "\"" pgg-pgp-user-id "\""))))
    (pgg-pgp-process-region (point)(point) nil pgg-pgp-program args)
    (insert-buffer-substring pgg-output-buffer)))

(defun pgg-pgp-snarf-keys-region (start end)
  "Add all public keys in region between START and END to the keyring."
  (let* ((pgg-pgp-user-id (or pgg-pgp-user-id pgg-default-user-id))
	 (key-file (pgg-make-temp-file "pgg"))
	 (args
	  (list "+verbose=1" "+batchmode" "+language=us" "-kaf"
		key-file)))
    (let ((coding-system-for-write 'raw-text-dos))
      (write-region start end key-file))
    (pgg-pgp-process-region start end nil pgg-pgp-program args)
    (delete-file key-file)
    (pgg-process-when-success nil)))

(provide 'pgg-pgp)

;;; arch-tag: 076b7801-37b2-49a6-97c3-218fdecde33c
;;; pgg-pgp.el ends here
Commit	Line	Data
23f87bed MB	1	;;; pgg-pgp.el --- PGP 2.* and 6.* support for PGG.
23f87bed MB	2
e84b4b86 TTN	3	;; Copyright (C) 1999, 2000, 2002, 2003, 2004,
e84b4b86 TTN	4	;; 2005 Free Software Foundation, Inc.
23f87bed MB	5
	6	;; Author: Daiki Ueno <ueno@unixuser.org>
	7	;; Created: 1999/11/02
	8	;; Keywords: PGP, OpenPGP
	9
	10	;; This file is part of GNU Emacs.
	11
	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 2, or (at your option)
	15	;; any later version.
	16
	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.
	21
	22	;; You should have received a copy of the GNU General Public License
	23	;; along with GNU Emacs; see the file COPYING. If not, write to the
3a35cf56 LK	24	;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
3a35cf56 LK	25	;; Boston, MA 02110-1301, USA.
23f87bed MB	26
	27	;;; Code:
	28
	29	(eval-when-compile
	30	(require 'cl) ; for pgg macros
	31	(require 'pgg))
	32
	33	(defgroup pgg-pgp ()
5a210b89	34	"PGP 2.* and 6.* interface."
23f87bed MB	35	:group 'pgg)
	36
	37	(defcustom pgg-pgp-program "pgp"
	38	"PGP 2.* and 6.* executable."
	39	:group 'pgg-pgp
	40	:type 'string)
	41
	42	(defcustom pgg-pgp-shell-file-name "/bin/sh"
	43	"File name to load inferior shells from.
	44	Bourne shell or its equivalent \(not tcsh) is needed for \"2>\"."
	45	:group 'pgg-pgp
	46	:type 'string)
	47
	48	(defcustom pgg-pgp-shell-command-switch "-c"
	49	"Switch used to have the shell execute its command line argument."
	50	:group 'pgg-pgp
	51	:type 'string)
	52
	53	(defcustom pgg-pgp-extra-args nil
	54	"Extra arguments for every PGP invocation."
	55	:group 'pgg-pgp
	56	:type '(choice
	57	(const :tag "None" nil)
	58	(string :tag "Arguments")))
	59
	60	(defvar pgg-pgp-user-id nil
	61	"PGP ID of your default identity.")
	62
	63	(defun pgg-pgp-process-region (start end passphrase program args)
	64	(let* ((errors-file-name (pgg-make-temp-file "pgg-errors"))
	65	(args
	66	(append args
	67	pgg-pgp-extra-args
	68	(list (concat "2>" errors-file-name))))
	69	(shell-file-name pgg-pgp-shell-file-name)
	70	(shell-command-switch pgg-pgp-shell-command-switch)
	71	(process-environment process-environment)
	72	(output-buffer pgg-output-buffer)
	73	(errors-buffer pgg-errors-buffer)
	74	(process-connection-type nil)
	75	process status exit-status)
	76	(with-current-buffer (get-buffer-create output-buffer)
	77	(buffer-disable-undo)
	78	(erase-buffer))
	79	(when passphrase
	80	(setenv "PGPPASSFD" "0"))
	81	(unwind-protect
	82	(progn
	83	(let ((coding-system-for-read 'binary)
	84	(coding-system-for-write 'binary))
	85	(setq process
	86	(apply #'funcall
	87	#'start-process-shell-command "PGP" output-buffer
	88	program args)))
	89	(set-process-sentinel process #'ignore)
	90	(when passphrase
	91	(process-send-string process (concat passphrase "\n")))
	92	(process-send-region process start end)
	93	(process-send-eof process)
	94	(while (eq 'run (process-status process))
	95	(accept-process-output process 5))
	96	(setq status (process-status process)
	97	exit-status (process-exit-status process))
	98	(delete-process process)
99	(with-current-buffer output-buffer
100	(pgg-convert-lbt-region (point-min)(point-max) 'LF)
101
102	(if (memq status '(stop signal))
103	(error "%s exited abnormally: '%s'" program exit-status))
104	(if (= 127 exit-status)
105	(error "%s could not be found" program))
106
107	(set-buffer (get-buffer-create errors-buffer))
108	(buffer-disable-undo)
109	(erase-buffer)
110	(insert-file-contents errors-file-name)))
111	(if (and process (eq 'run (process-status process)))
112	(interrupt-process process))
113	(condition-case nil
114	(delete-file errors-file-name)
115	(file-error nil)))))
116
117	(defun pgg-pgp-lookup-key (string &optional type)
118	"Search keys associated with STRING."
119	(let ((args (list "+batchmode" "+language=en" "-kv" string)))
120	(with-current-buffer (get-buffer-create pgg-output-buffer)
121	(buffer-disable-undo)
122	(erase-buffer)
123	(apply #'call-process pgg-pgp-program nil t nil args)
124	(goto-char (point-min))
125	(cond
126	((re-search-forward "^pub\\s +[0-9]+/" nil t);PGP 2.*
127	(buffer-substring (point)(+ 8 (point))))
128	((re-search-forward "^Type" nil t);PGP 6.*
129	(beginning-of-line 2)
130	(substring
131	(nth 2 (split-string
132	(buffer-substring (point)(progn (end-of-line) (point)))))
133	2))))))
134
135	(defun pgg-pgp-encrypt-region (start end recipients)
136	"Encrypt the current region between START and END."
137	(let* ((pgg-pgp-user-id (or pgg-pgp-user-id pgg-default-user-id))
138	(args
139	`("+encrypttoself=off +verbose=1" "+batchmode"
140	"+language=us" "-fate"
141	,@(if recipients
142	(mapcar (lambda (rcpt) (concat "\"" rcpt "\""))
143	(append recipients
144	(if pgg-encrypt-for-me
145	(list pgg-pgp-user-id))))))))
146	(pgg-pgp-process-region start end nil pgg-pgp-program args)
147	(pgg-process-when-success nil)))
148
149	(defun pgg-pgp-decrypt-region (start end)
150	"Decrypt the current region between START and END."
151	(let* ((pgg-pgp-user-id (or pgg-pgp-user-id pgg-default-user-id))
710f2e1b	152	(key (pgg-pgp-lookup-key pgg-pgp-user-id 'encrypt))
23f87bed MB	153	(passphrase
23f87bed MB	154	(pgg-read-passphrase
710f2e1b	155	(format "PGP passphrase for %s: " pgg-pgp-user-id) key))
23f87bed MB	156	(args
	157	'("+verbose=1" "+batchmode" "+language=us" "-f")))
	158	(pgg-pgp-process-region start end passphrase pgg-pgp-program args)
710f2e1b SJ	159	(pgg-process-when-success
	160	(if pgg-cache-passphrase
	161	(pgg-add-passphrase-cache key passphrase)))))
23f87bed MB	162
	163	(defun pgg-pgp-sign-region (start end &optional clearsign)
	164	"Make detached signature from text between START and END."
	165	(let* ((pgg-pgp-user-id (or pgg-pgp-user-id pgg-default-user-id))
	166	(passphrase
	167	(pgg-read-passphrase
	168	(format "PGP passphrase for %s: " pgg-pgp-user-id)
	169	(pgg-pgp-lookup-key pgg-pgp-user-id 'sign)))
	170	(args
	171	(list (if clearsign "-fast" "-fbast")
	172	"+verbose=1" "+language=us" "+batchmode"
	173	"-u" pgg-pgp-user-id)))
	174	(pgg-pgp-process-region start end passphrase pgg-pgp-program args)
	175	(pgg-process-when-success
	176	(goto-char (point-min))
	177	(when (re-search-forward "^-+BEGIN PGP" nil t);XXX
	178	(let ((packet
	179	(cdr (assq 2 (pgg-parse-armor-region
	180	(progn (beginning-of-line 2)
	181	(point))
	182	(point-max))))))
	183	(if pgg-cache-passphrase
	184	(pgg-add-passphrase-cache
	185	(cdr (assq 'key-identifier packet))
	186	passphrase)))))))
	187
	188	(defun pgg-pgp-verify-region (start end &optional signature)
	189	"Verify region between START and END as the detached signature SIGNATURE."
	190	(let* ((orig-file (pgg-make-temp-file "pgg"))
	191	(args '("+verbose=1" "+batchmode" "+language=us"))
	192	(orig-mode (default-file-modes)))
	193	(unwind-protect
	194	(progn
	195	(set-default-file-modes 448)
	196	(let ((coding-system-for-write 'binary)
	197	jka-compr-compression-info-list jam-zcat-filename-list)
	198	(write-region start end orig-file)))
	199	(set-default-file-modes orig-mode))
	200	(if (stringp signature)
	201	(progn
	202	(copy-file signature (setq signature (concat orig-file ".asc")))
	203	(setq args (append args (list signature orig-file))))
	204	(setq args (append args (list orig-file))))
	205	(pgg-pgp-process-region (point)(point) nil pgg-pgp-program args)
	206	(delete-file orig-file)
	207	(if signature (delete-file signature))
	208	(pgg-process-when-success
	209	(goto-char (point-min))
	210	(let ((case-fold-search t))
	211	(while (re-search-forward "^warning: " nil t)
	212	(delete-region (match-beginning 0)
	213	(progn (beginning-of-line 2) (point)))))
	214	(goto-char (point-min))
	215	(when (re-search-forward "^\\.$" nil t)
	216	(delete-region (point-min)
	217	(progn (beginning-of-line 2)
	218	(point)))))))
	219
	220	(defun pgg-pgp-insert-key ()
	221	"Insert public key at point."
	222	(let* ((pgg-pgp-user-id (or pgg-pgp-user-id pgg-default-user-id))
	223	(args
	224	(list "+verbose=1" "+batchmode" "+language=us" "-kxaf"
	225	(concat "\"" pgg-pgp-user-id "\""))))
226	(pgg-pgp-process-region (point)(point) nil pgg-pgp-program args)
227	(insert-buffer-substring pgg-output-buffer)))
228
229	(defun pgg-pgp-snarf-keys-region (start end)
230	"Add all public keys in region between START and END to the keyring."
231	(let* ((pgg-pgp-user-id (or pgg-pgp-user-id pgg-default-user-id))
232	(key-file (pgg-make-temp-file "pgg"))
233	(args
234	(list "+verbose=1" "+batchmode" "+language=us" "-kaf"
235	key-file)))
236	(let ((coding-system-for-write 'raw-text-dos))
237	(write-region start end key-file))
238	(pgg-pgp-process-region start end nil pgg-pgp-program args)
239	(delete-file key-file)
240	(pgg-process-when-success nil)))
241
242	(provide 'pgg-pgp)
243
244	;;; arch-tag: 076b7801-37b2-49a6-97c3-218fdecde33c
245	;;; pgg-pgp.el ends here