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;;; mime-pgp.el --- mime-view internal methods for EasyPG.
;; Copyright (C) 1995,1996,1997,1998,1999,2000 Free Software Foundation, Inc.
;; Author: MORIOKA Tomohiko <tomo@m17n.org>
;; Daiki Ueno <ueno@unixuser.org>
;; Kazuhiro Ito <kzhr@d1.dion.ne.jp>
;; Created: 1995/12/7
;; Renamed: 1997/2/27 from tm-pgp.el
;; Renamed: 2010/11/27 from mime-pgp.el in emiko-epg
;; Renamed: 2012/10/05 from mime-epg.el
;; Keywords: PGP, security, MIME, multimedia, mail, news
;; This file is part of SEMI (Secure Emacs MIME Interface).
;; This program 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.
;; This program 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.
;;; Commentary:
;;; Code:
(require 'mime-play)
(require 'epg)
(require 'epa)
(eval-when-compile (require 'mmgeneric))
(defcustom mime-pgp-decrypt-when-preview nil
"When non-nil, decrypt encrypted part while viewing."
:group 'mime-view
:type 'boolean)
;;; @ Internal method for multipart/signed
(defun mime-verify-multipart/signed (entity situation)
"Internal method to verify multipart/signed."
(mime-play-entity
(nth 1 (mime-entity-children entity)) ; entity-info of signature
(list (assq 'mode situation)) ; play-mode
))
;;; @ Internal method for multipart/encrypted
(defun mime-display-multipart/pgp-encrypted (entity situation)
(let ((original-major-mode-cell (assq 'major-mode situation))
(default-situation
(cdr (assq 'childrens-situation situation)))
child-situation)
(unless mime-pgp-decrypt-when-preview
(insert "This part is encrypted.\n"))
(when original-major-mode-cell
(setq default-situation
(cons original-major-mode-cell default-situation)))
(mapc
(lambda (child)
(setq child-situation
(mime-find-entity-preview-situation child default-situation))
(if (and (eq (cdr (assq 'type child-situation)) 'application)
(eq (cdr (assq 'subtype child-situation)) 'pgp-encrypted))
(mime-display-entity
child (put-alist 'body (if mime-pgp-decrypt-when-preview
'visible
'invisible)
(copy-alist child-situation)))
(when mime-view-multipart-show-all-children
(mime-display-entity
child (put-alist 'body 'invisible (copy-alist child-situation))))))
(mime-entity-children entity))))
;;; @ Internal method for application/*-signature
(defun mime-verify-application/*-signature-internal (entity situation)
(let* ((mother (mime-entity-parent entity))
(orig-entity (car (mime-entity-children mother)))
(protocol (cdr (assoc "protocol" (mime-entity-parameters mother))))
context)
(if (null protocol)
"No protocol is specified."
(setq context
(epg-make-context
(cond
((equal protocol "application/pgp-signature")
'OpenPGP)
((string-match
"\\`application/\\(x-\\)?pkcs7-signature\\'" protocol)
'CMS))))
(if (null context)
(format "Unknown protocol: %s." protocol)
(epg-verify-string context
(mime-entity-content entity)
(with-temp-buffer
(if (fboundp 'set-buffer-multibyte)
(set-buffer-multibyte nil))
(mime-insert-entity orig-entity)
(goto-char (point-min))
(while (search-forward "\n" nil t)
(replace-match "\r\n"))
(buffer-substring (point-min) (point-max))))
(epg-context-result-for context 'verify)))))
(defun mime-verify-application/*-signature (entity situation)
(let ((verify-result
(mime-verify-application/*-signature-internal entity situation)))
(cond
((stringp verify-result)
(mime-show-echo-buffer verify-result))
((> (length verify-result) 1)
(mime-show-echo-buffer (epg-verify-result-to-string verify-result)))
(verify-result
(epa-display-info (epg-verify-result-to-string verify-result))))))
(defun mime-preview-application/*-signature (entity situation)
(let ((verify-result
(mime-verify-application/*-signature-internal entity situation))
string)
(if (stringp verify-result)
(insert verify-result)
(setq string (epg-verify-result-to-string verify-result))
(when (> (length string) 0)
(unless (string-equal (substring string -1) "\n")
(setq string (concat string "\n")))
(insert string)))))
;;; @ Internal method for application/pgp-encrypted
(defun mime-decrypt-application/pgp-encrypted (entity situation)
(let* ((mother (mime-entity-parent entity))
(encrypted-entity (nth 1 (mime-entity-children mother)))
(p-win (or (get-buffer-window (current-buffer))
(get-largest-window)))
(new-name
(format "%s-%s" (buffer-name) (mime-entity-number entity)))
(mother (current-buffer))
(preview-buffer (concat "*Preview-" (buffer-name) "*"))
representation-type message-buf context plain verify-result)
(set-buffer (setq message-buf (get-buffer-create new-name)))
(erase-buffer)
(mime-insert-entity encrypted-entity)
(goto-char (point-min))
(setq context (epg-make-context)
plain (decode-coding-string
(epg-decrypt-string
context
(buffer-substring (point-min)(point-max)))
'raw-text))
(delete-region (point-min)(point-max))
(insert plain)
(setq representation-type 'binary
major-mode 'mime-show-message-mode)
(save-window-excursion
(mime-view-buffer nil preview-buffer mother
nil representation-type)
(make-local-variable 'mime-view-temp-message-buffer)
(setq mime-view-temp-message-buffer message-buf))
(set-window-buffer p-win preview-buffer)
(setq verify-result (epg-context-result-for context 'verify))
(if (> (length verify-result) 1)
(mime-show-echo-buffer (epg-verify-result-to-string verify-result))
(if verify-result
(epa-display-info (epg-verify-result-to-string verify-result))))))
(defvar mime-pgp-decrypted-buffers nil)
(defun mime-pgp-kill-decrypted-buffers ()
(mapc (lambda (buffer)
(when (bufferp buffer)
(kill-buffer buffer)))
mime-pgp-decrypted-buffers))
;; Imported and modified from Wanderlust.
(defun mime-preview-application/pgp-encrypted (entity situation)
(let ((p (point-max))
beg end buffer decrypted-entity)
(goto-char p)
(save-restriction
(narrow-to-region p p)
(setq buffer (generate-new-buffer (concat mime-temp-buffer-name "PGP*")))
(add-hook 'kill-buffer-hook 'mime-pgp-kill-decrypted-buffers nil t)
(make-local-variable 'mime-pgp-decrypted-buffers)
(add-to-list 'mime-pgp-decrypted-buffers buffer)
(with-current-buffer buffer
(mime-insert-entity
(nth 1 (mime-entity-children (mime-entity-parent entity))))
(setq beg (point-min)
end (point-max))
(insert (prog1 (decode-coding-string
(epg-decrypt-string
(epg-make-context) (buffer-substring beg end))
'raw-text)
(delete-region beg end)))
(setq decrypted-entity
(mime-parse-message
(mm-expand-class-name 'buffer)
nil entity (mime-entity-node-id-internal entity))
buffer-read-only t))
(mime-display-entity
decrypted-entity nil '((header . visible)
(body . visible)
(entity-button . invisible))))))
;;; @ Internal method for application/pgp-keys
(defun mime-add-application/pgp-keys (entity situation)
(epg-import-keys-from-string (epg-make-context)
(mime-entity-content entity)))
;;; @ Internal method for application/pkcs7-mime
(defun mime-view-application/pkcs7-mime (entity situation)
(let* ((p-win (or (get-buffer-window (current-buffer))
(get-largest-window)))
(new-name
(format "%s-%s" (buffer-name) (mime-entity-number entity)))
(mother (current-buffer))
(preview-buffer (concat "*Preview-" (buffer-name) "*"))
(context (epg-make-context 'CMS))
message-buf)
(when (memq (or (cdr (assq 'smime-type situation)) 'enveloped-data)
'(enveloped-data signed-data))
(set-buffer (setq message-buf (get-buffer-create new-name)))
(let ((inhibit-read-only t)
buffer-read-only)
(erase-buffer)
(insert (epg-decrypt-string context (mime-entity-content entity))))
(setq major-mode 'mime-show-message-mode)
(save-window-excursion
(mime-view-buffer nil preview-buffer mother
nil 'binary)
(make-local-variable 'mime-view-temp-message-buffer)
(setq mime-view-temp-message-buffer message-buf))
(set-window-buffer p-win preview-buffer))))
;;; @ end
;;;
(provide 'mime-pgp)
(run-hooks 'mime-pgp-load-hook)
;;; mime-pgp.el ends here
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