pgg-pgp.el

   1 ;;; pgg-pgp.el --- PGP 2.* and 6.* support for PGG.
   2
   3 ;; Copyright (C) 1999 Daiki Ueno
   4
   5 ;; Author: Daiki Ueno <ueno@ueda.info.waseda.ac.jp>
   6 ;; Created: 1999/11/02
   7 ;; Keywords: PGP, OpenPGP
   8
   9 ;; This file is part of SEMI (Secure Emacs MIME Interface).
  10
  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.
  15
  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.
  20
  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.
  25
  26 ;;; Code:
  27
  28 (eval-when-compile (require 'pgg))
  29
  30 (defgroup pgg-pgp ()
  31   "PGP 2.* and 6.* interface"
  32   :group 'pgg)
  33
  34 (defcustom pgg-pgp-program "pgp"
  35   "PGP 2.* and 6.* executable."
  36   :group 'pgg-pgp
  37   :type 'string)
  38
  39 (defcustom pgg-pgp-shell-file-name "/bin/sh"
  40   "The GnuPG executable."
  41   :group 'pgg-pgp
  42   :type 'string)
  43
  44 (defcustom pgg-pgp-extra-args nil
  45   "Extra arguments for every PGP invocation."
  46   :group 'pgg-pgp
  47   :type 'string)
  48
  49 (eval-and-compile
  50   (luna-define-class pgg-scheme-pgp (pgg-scheme))
  51   )
  52
  53 (defvar pgg-pgp-user-id nil
  54   "GnuPG ID of your default identity.")
  55
  56 (defvar pgg-scheme-pgp-instance nil)
  57
  58 ;;;###autoload
  59 (defun pgg-make-scheme-pgp ()
  60   (or pgg-scheme-pgp-instance
  61       (setq pgg-scheme-pgp-instance
  62             (luna-make-entity 'pgg-scheme-pgp))))
  63
  64 (defun pgg-pgp-process-region (start end passphrase program args)
  65   (let* ((errors-file-name
  66           (concat temporary-file-directory
  67                   (make-temp-name "pgg-errors")))
  68          (args
  69           (append args
  70                   pgg-pgp-extra-args
  71                   (list (concat "2>" errors-file-name))))
  72          (shell-file-name pgg-pgp-shell-file-name)
  73          (output-buffer pgg-output-buffer)
  74          (errors-buffer pgg-errors-buffer)
  75          (process-connection-type nil)
  76          process status exit-status)
  77     (with-current-buffer (get-buffer-create output-buffer)
  78       (buffer-disable-undo)
  79       (erase-buffer))
  80     (setq process
  81           (apply #'start-process-shell-command "*PGP*" output-buffer
  82                  program args))
  83     (set-process-sentinel process 'ignore)
  84     (when passphrase
  85       (setenv "PGPPASSFD" "0")
  86       (process-send-string process (concat passphrase "\n")))
  87     (process-send-region process start end)
  88     (process-send-eof process)
  89     (while (eq 'run (process-status process))
  90       (accept-process-output process 5))
  91     (setq status (process-status process)
  92           exit-status (process-exit-status process))
  93     (delete-process process)
  94     (with-current-buffer output-buffer
  95       (goto-char (point-min))
  96       (while (search-forward "\r$" nil t)
  97         (replace-match ""))
  98       (if (memq status '(stop signal))
  99           (error "%s exited abnormally: '%s'" program exit-status))
 100       (if (= 127 exit-status)
 101           (error "%s could not be found" program))
 102
 103       (set-buffer (get-buffer-create errors-buffer))
 104       (buffer-disable-undo)
 105       (erase-buffer)
 106       (insert-file-contents errors-file-name)
 107       (delete-file errors-file-name)
 108
 109       (if (and process (eq 'run (process-status process)))
 110           (interrupt-process process))
 111       )
 112     ))
 113
 114 (luna-define-method encrypt-region ((scheme pgg-scheme-pgp)
 115                                     start end recipients)
 116   (let* ((pgg-pgp-user-id pgg-default-user-id)
 117          (passphrase
 118           (pgg-read-passphrase
 119            (format "PGP passphrase for %s: " pgg-pgp-user-id)))
 120          (args
 121           `("+encrypttoself=off +verbose=1" "+batchmode"
 122             "+language=us" "-fate"
 123             ,@(if recipients
 124                   (mapcar (lambda (rcpt) (concat "\"" rcpt "\""))
 125                           recipients)))))
 126     (pgg-pgp-process-region start end passphrase
 127                             pgg-pgp-program args)
 128     (with-current-buffer pgg-output-buffer
 129       (when (zerop (buffer-size))
 130         (insert-buffer-substring pgg-errors-buffer)))
 131     ))
 132
 133 (luna-define-method decrypt-region ((scheme pgg-scheme-pgp)
 134                                     start end)
 135   (let* ((pgg-pgp-user-id pgg-default-user-id)
 136          (passphrase
 137           (pgg-read-passphrase
 138            (format "PGP passphrase for %s: " pgg-pgp-user-id)))
 139          (args
 140           '("+verbose=1" "+batchmode" "+language=us" "-f")))
 141     (pgg-pgp-process-region start end passphrase
 142                             pgg-pgp-program args)
 143     (with-current-buffer pgg-output-buffer
 144       (when (zerop (buffer-size))
 145         (insert-buffer-substring pgg-errors-buffer)))
 146     ))
 147
 148 (luna-define-method sign-region ((scheme pgg-scheme-pgp)
 149                                  start end)
 150   (let* ((pgg-pgp-user-id pgg-default-user-id)
 151          (passphrase
 152           (pgg-read-passphrase
 153            (format "PGP passphrase for %s: " pgg-pgp-user-id)))
 154          (args
 155           (list "-fbast" "+verbose=1" "+language=us" "+batchmode"
 156                 "-u" pgg-pgp-user-id)))
 157     (pgg-pgp-process-region start end passphrase
 158                              pgg-pgp-program args)
 159     (with-current-buffer pgg-output-buffer
 160       (when (zerop (buffer-size))
 161         (insert-buffer-substring pgg-errors-buffer)))
 162     ))
 163
 164 (luna-define-method verify-region ((scheme pgg-scheme-pgp)
 165                                    start end &optional signature)
 166   (let* ((basename (expand-file-name "pgg" temporary-file-directory))
 167          (orig-file (make-temp-name basename))
 168          (args '("+verbose=1" "+batchmode" "+language=us")))
 169     (write-region-as-binary start end orig-file)
 170     (when (stringp signature)
 171       (copy-file signature (setq signature (concat orig-file ".asc")))
 172       (setq args (append args (list signature orig-file)))
 173       )
 174     (pgg-pgp-process-region (point-min)(point-max) nil
 175                             pgg-pgp-program args)
 176     (delete-file orig-file)
 177     (delete-file signature)
 178     (set-buffer pgg-output-buffer)
 179     (with-current-buffer pgg-output-buffer
 180       (when (zerop (buffer-size))
 181         (insert-buffer-substring pgg-errors-buffer)))
 182     ))
 183
 184 (luna-define-method insert-key ((scheme pgg-scheme-pgp))
 185   (let* ((pgg-pgp-user-id pgg-default-user-id)
 186          (args
 187           (list "+verbose=1" "+batchmode" "+language=us" "-kxaf"
 188                 (concat "\"" pgg-pgp-user-id "\""))))
 189     (pgg-pgp-process-region (point)(point) nil
 190                              pgg-pgp-program args)
 191     (insert-buffer-substring pgg-output-buffer)
 192     ))
 193
 194 (luna-define-method snarf-keys-region ((scheme pgg-scheme-pgp)
 195                                        start end)
 196   (let* ((pgg-pgp-user-id pgg-default-user-id)
 197          (basename (expand-file-name "pgg" temporary-file-directory))
 198          (key-file (make-temp-name basename))
 199          (args
 200           (list "+verbose=1" "+batchmode" "+language=us" "-kaf"
 201                 key-file)))
 202     (write-region-as-raw-text-CRLF start end key-file)
 203     (pgg-pgp-process-region start end nil
 204                             pgg-pgp-program args)
 205     (delete-file key-file)
 206     ))
 207
 208 (provide 'pgg-pgp)
 209
 210 ;;; pgg-pgp.el ends here