lisp/gnus/mml1991.el

   1 ;;; mml1991.el --- Old PGP message format (RFC 1991) support for MML
   2
   3 ;; Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004,
   4 ;;   2005, 2006, 2007 Free Software Foundation, Inc.
   5
   6 ;; Author: Sascha Lüdecke <sascha@meta-x.de>,
   7 ;;      Simon Josefsson <simon@josefsson.org> (Mailcrypt interface, Gnus glue)
   8 ;; Keywords PGP
   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 3, 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
  24 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  25 ;; Boston, MA 02110-1301, USA.
  26
  27 ;;; Commentary:
  28
  29 ;;; Code:
  30
  31 (eval-when-compile
  32   (require 'cl)
  33   (require 'mm-util))
  34
  35 (defvar mc-pgp-always-sign)
  36
  37 (autoload 'quoted-printable-decode-region "qp")
  38 (autoload 'quoted-printable-encode-region "qp")
  39
  40 (defvar mml1991-use mml2015-use
  41   "The package used for PGP.")
  42
  43 (defvar mml1991-function-alist
  44   '((mailcrypt mml1991-mailcrypt-sign
  45                mml1991-mailcrypt-encrypt)
  46     (gpg mml1991-gpg-sign
  47          mml1991-gpg-encrypt)
  48     (pgg mml1991-pgg-sign
  49          mml1991-pgg-encrypt))
  50   "Alist of PGP functions.")
  51
  52 ;;; mailcrypt wrapper
  53
  54 (eval-and-compile
  55   (autoload 'mc-sign-generic "mc-toplev"))
  56
  57 (defvar mml1991-decrypt-function 'mailcrypt-decrypt)
  58 (defvar mml1991-verify-function 'mailcrypt-verify)
  59
  60 (defun mml1991-mailcrypt-sign (cont)
  61   (let ((text (current-buffer))
  62         headers signature
  63         (result-buffer (get-buffer-create "*GPG Result*")))
  64     ;; Save MIME Content[^ ]+: headers from signing
  65     (goto-char (point-min))
  66     (while (looking-at "^Content[^ ]+:") (forward-line))
  67     (unless (bobp)
  68       (setq headers (buffer-string))
  69       (delete-region (point-min) (point)))
  70     (goto-char (point-max))
  71     (unless (bolp)
  72       (insert "\n"))
  73     (quoted-printable-decode-region (point-min) (point-max))
  74     (with-temp-buffer
  75       (setq signature (current-buffer))
  76       (insert-buffer-substring text)
  77       (unless (mc-sign-generic (message-options-get 'message-sender)
  78                                nil nil nil nil)
  79         (unless (> (point-max) (point-min))
  80           (pop-to-buffer result-buffer)
  81           (error "Sign error")))
  82       (goto-char (point-min))
  83       (while (re-search-forward "\r+$" nil t)
  84         (replace-match "" t t))
  85       (quoted-printable-encode-region (point-min) (point-max))
  86       (set-buffer text)
  87       (delete-region (point-min) (point-max))
  88       (if headers (insert headers))
  89       (insert "\n")
  90       (insert-buffer-substring signature)
  91       (goto-char (point-max)))))
  92
  93 (defun mml1991-mailcrypt-encrypt (cont &optional sign)
  94   (let ((text (current-buffer))
  95         (mc-pgp-always-sign
  96          (or mc-pgp-always-sign
  97              sign
  98              (eq t (or (message-options-get 'message-sign-encrypt)
  99                        (message-options-set
 100                         'message-sign-encrypt
 101                         (or (y-or-n-p "Sign the message? ")
 102                             'not))))
 103              'never))
 104         cipher
 105         (result-buffer (get-buffer-create "*GPG Result*")))
 106     ;; Strip MIME Content[^ ]: headers since it will be ASCII ARMOURED
 107     (goto-char (point-min))
 108     (while (looking-at "^Content[^ ]+:") (forward-line))
 109     (unless (bobp)
 110       (delete-region (point-min) (point)))
 111     (mm-with-unibyte-current-buffer
 112       (with-temp-buffer
 113         (setq cipher (current-buffer))
 114         (insert-buffer-substring text)
 115         (unless (mc-encrypt-generic
 116                  (or
 117                   (message-options-get 'message-recipients)
 118                   (message-options-set 'message-recipients
 119                                        (read-string "Recipients: ")))
 120                  nil
 121                  (point-min) (point-max)
 122                  (message-options-get 'message-sender)
 123                  'sign)
 124           (unless (> (point-max) (point-min))
 125             (pop-to-buffer result-buffer)
 126             (error "Encrypt error")))
 127         (goto-char (point-min))
 128         (while (re-search-forward "\r+$" nil t)
 129           (replace-match "" t t))
 130         (set-buffer text)
 131         (delete-region (point-min) (point-max))
 132         ;;(insert "Content-Type: application/pgp-encrypted\n\n")
 133         ;;(insert "Version: 1\n\n")
 134         (insert "\n")
 135         (insert-buffer-substring cipher)
 136         (goto-char (point-max))))))
 137
 138 ;;; gpg wrapper
 139
 140 (eval-and-compile
 141   (autoload 'gpg-sign-cleartext "gpg"))
 142
 143 (defun mml1991-gpg-sign (cont)
 144   (let ((text (current-buffer))
 145         headers signature
 146         (result-buffer (get-buffer-create "*GPG Result*")))
 147     ;; Save MIME Content[^ ]+: headers from signing
 148     (goto-char (point-min))
 149     (while (looking-at "^Content[^ ]+:") (forward-line))
 150     (unless (bobp)
 151       (setq headers (buffer-string))
 152       (delete-region (point-min) (point)))
 153     (goto-char (point-max))
 154     (unless (bolp)
 155       (insert "\n"))
 156     (quoted-printable-decode-region (point-min) (point-max))
 157     (with-temp-buffer
 158       (unless (gpg-sign-cleartext text (setq signature (current-buffer))
 159                                   result-buffer
 160                                   nil
 161                                   (message-options-get 'message-sender))
 162         (unless (> (point-max) (point-min))
 163           (pop-to-buffer result-buffer)
 164           (error "Sign error")))
 165       (goto-char (point-min))
 166       (while (re-search-forward "\r+$" nil t)
 167         (replace-match "" t t))
 168       (quoted-printable-encode-region (point-min) (point-max))
 169       (set-buffer text)
 170       (delete-region (point-min) (point-max))
 171       (if headers (insert headers))
 172       (insert "\n")
 173       (insert-buffer-substring signature)
 174       (goto-char (point-max)))))
 175
 176 (defun mml1991-gpg-encrypt (cont &optional sign)
 177   (let ((text (current-buffer))
 178         cipher
 179         (result-buffer (get-buffer-create "*GPG Result*")))
 180     ;; Strip MIME Content[^ ]: headers since it will be ASCII ARMOURED
 181     (goto-char (point-min))
 182     (while (looking-at "^Content[^ ]+:") (forward-line))
 183     (unless (bobp)
 184       (delete-region (point-min) (point)))
 185     (mm-with-unibyte-current-buffer
 186       (with-temp-buffer
 187         (flet ((gpg-encrypt-func
 188                 (sign plaintext ciphertext result recipients &optional
 189                       passphrase sign-with-key armor textmode)
 190                 (if sign
 191                     (gpg-sign-encrypt
 192                      plaintext ciphertext result recipients passphrase
 193                      sign-with-key armor textmode)
 194                   (gpg-encrypt
 195                    plaintext ciphertext result recipients passphrase
 196                    armor textmode))))
 197           (unless (gpg-encrypt-func
 198                    sign
 199                    text (setq cipher (current-buffer))
 200                    result-buffer
 201                    (split-string
 202                     (or
 203                      (message-options-get 'message-recipients)
 204                      (message-options-set 'message-recipients
 205                                           (read-string "Recipients: ")))
 206                     "[ \f\t\n\r\v,]+")
 207                    nil
 208                    (message-options-get 'message-sender)
 209                    t t) ; armor & textmode
 210             (unless (> (point-max) (point-min))
 211               (pop-to-buffer result-buffer)
 212               (error "Encrypt error"))))
 213         (goto-char (point-min))
 214         (while (re-search-forward "\r+$" nil t)
 215           (replace-match "" t t))
 216         (set-buffer text)
 217         (delete-region (point-min) (point-max))
 218         ;;(insert "Content-Type: application/pgp-encrypted\n\n")
 219         ;;(insert "Version: 1\n\n")
 220         (insert "\n")
 221         (insert-buffer-substring cipher)
 222         (goto-char (point-max))))))
 223
 224 ;; pgg wrapper
 225
 226 (eval-when-compile
 227   (defvar pgg-default-user-id)
 228   (defvar pgg-errors-buffer)
 229   (defvar pgg-output-buffer))
 230
 231 (defun mml1991-pgg-sign (cont)
 232   (let ((pgg-text-mode t)
 233         (pgg-default-user-id (or (message-options-get 'mml-sender)
 234                                  pgg-default-user-id))
 235         headers cte)
 236     ;; Don't sign headers.
 237     (goto-char (point-min))
 238     (when (re-search-forward "^$" nil t)
 239       (setq headers (buffer-substring (point-min) (point)))
 240       (save-restriction
 241         (narrow-to-region (point-min) (point))
 242         (setq cte (mail-fetch-field "content-transfer-encoding")))
 243       (forward-line 1)
 244       (delete-region (point-min) (point))
 245       (when cte
 246         (setq cte (intern (downcase cte)))
 247         (mm-decode-content-transfer-encoding cte)))
 248     (unless (pgg-sign-region (point-min) (point-max) t)
 249       (pop-to-buffer pgg-errors-buffer)
 250       (error "Encrypt error"))
 251     (delete-region (point-min) (point-max))
 252     (mm-with-unibyte-current-buffer
 253       (insert-buffer-substring pgg-output-buffer)
 254       (goto-char (point-min))
 255       (while (re-search-forward "\r+$" nil t)
 256         (replace-match "" t t))
 257       (when cte
 258         (mm-encode-content-transfer-encoding cte))
 259       (goto-char (point-min))
 260       (when headers
 261         (insert headers))
 262       (insert "\n"))
 263     t))
 264
 265 (defun mml1991-pgg-encrypt (cont &optional sign)
 266   (goto-char (point-min))
 267   (when (re-search-forward "^$" nil t)
 268     (let ((cte (save-restriction
 269                  (narrow-to-region (point-min) (point))
 270                  (mail-fetch-field "content-transfer-encoding"))))
 271       ;; Strip MIME headers since it will be ASCII armoured.
 272       (forward-line 1)
 273       (delete-region (point-min) (point))
 274       (when cte
 275         (mm-decode-content-transfer-encoding (intern (downcase cte))))))
 276   (unless (let ((pgg-text-mode t))
 277             (pgg-encrypt-region
 278              (point-min) (point-max)
 279              (split-string
 280               (or
 281                (message-options-get 'message-recipients)
 282                (message-options-set 'message-recipients
 283                                     (read-string "Recipients: ")))
 284               "[ \f\t\n\r\v,]+")
 285              sign))
 286     (pop-to-buffer pgg-errors-buffer)
 287     (error "Encrypt error"))
 288   (delete-region (point-min) (point-max))
 289   (insert "\n")
 290   (insert-buffer-substring pgg-output-buffer)
 291   t)
 292
 293 ;;;###autoload
 294 (defun mml1991-encrypt (cont &optional sign)
 295   (let ((func (nth 2 (assq mml1991-use mml1991-function-alist))))
 296     (if func
 297         (funcall func cont sign)
 298       (error "Cannot find encrypt function"))))
 299
 300 ;;;###autoload
 301 (defun mml1991-sign (cont)
 302   (let ((func (nth 1 (assq mml1991-use mml1991-function-alist))))
 303     (if func
 304         (funcall func cont)
 305       (error "Cannot find sign function"))))
 306
 307 (provide 'mml1991)
 308
 309 ;; Local Variables:
 310 ;; coding: iso-8859-1
 311 ;; End:
 312
 313 ;;; arch-tag: e542be18-ab28-4393-9b33-97fe9cf30706
 314 ;;; mml1991.el ends here