--- /dev/null
+;;; mime-pgp.el --- mime-view internal methods for PGP.
+
+;; Copyright (C) 1995,1996,1997 MORIOKA Tomohiko
+
+;; Author: MORIOKA Tomohiko <morioka@jaist.ac.jp>
+;; Created: 1995/12/7
+;; Version: $Id: mime-pgp.el,v 0.0 1997-02-27 08:09:32 tmorioka Exp $
+;; Keywords: mail, news, MIME, multimedia, PGP, security
+
+;; This file is part of SEMI (SEMI is Emacs MIME Interfaces).
+
+;; 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., 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
+
+;;; Commentary:
+
+;; This module is based on 2 drafts about PGP MIME integration:
+
+;; - RFC 2015: "MIME Security with Pretty Good Privacy (PGP)"
+;; by Michael Elkins <elkins@aero.org> (1996/6)
+;;
+;; - draft-kazu-pgp-mime-00.txt: "PGP MIME Integration"
+;; by Kazuhiko Yamamoto <kazu@is.aist-nara.ac.jp>
+;; (1995/10; expired)
+;;
+;; These drafts may be contrary to each other. You should decide
+;; which you support. (Maybe you should use PGP/MIME)
+
+;;; Code:
+
+(require 'mime-play)
+
+
+;;; @ internal method for application/pgp
+;;;
+;;; It is based on draft-kazu-pgp-mime-00.txt
+
+(defun mime-article/view-application/pgp (beg end cal)
+ (let* ((cnum (mime-article/point-content-number beg))
+ (cur-buf (current-buffer))
+ (p-win (or (get-buffer-window mime::article/preview-buffer)
+ (get-largest-window)))
+ (new-name (format "%s-%s" (buffer-name) cnum))
+ (mother mime::article/preview-buffer)
+ (mode major-mode)
+ code-converter
+ (str (buffer-substring beg end))
+ )
+ (set-buffer (get-buffer-create new-name))
+ (erase-buffer)
+ (insert str)
+ (cond ((progn
+ (goto-char (point-min))
+ (re-search-forward "^-+BEGIN PGP SIGNED MESSAGE-+$" nil t)
+ )
+ (funcall (pgp-function 'verify))
+ (goto-char (point-min))
+ (delete-region
+ (point-min)
+ (and
+ (re-search-forward "^-+BEGIN PGP SIGNED MESSAGE-+\n\n")
+ (match-end 0))
+ )
+ (delete-region
+ (and (re-search-forward "^-+BEGIN PGP SIGNATURE-+")
+ (match-beginning 0))
+ (point-max)
+ )
+ (goto-char (point-min))
+ (while (re-search-forward "^- -" nil t)
+ (replace-match "-")
+ )
+ (setq code-converter
+ (or
+ (cdr (assq mode mime-viewer/code-converter-alist))
+ (function mime-viewer/default-code-convert-region)))
+ )
+ ((progn
+ (goto-char (point-min))
+ (re-search-forward "^-+BEGIN PGP MESSAGE-+$" nil t)
+ )
+ (as-binary-process (funcall (pgp-function 'decrypt)))
+ (goto-char (point-min))
+ (delete-region (point-min)
+ (and
+ (search-forward "\n\n")
+ (match-end 0)))
+ (setq code-converter (function mime-charset/decode-buffer))
+ ))
+ (setq major-mode 'mime/show-message-mode)
+ (setq mime::article/code-converter code-converter)
+ (save-window-excursion (mime/viewer-mode mother))
+ (set-window-buffer p-win mime::article/preview-buffer)
+ ))
+
+(set-atype 'mime/content-decoding-condition
+ '((type . "application/pgp")
+ (method . mime-article/view-application/pgp)
+ ))
+
+(set-atype 'mime/content-decoding-condition
+ '((type . "text/x-pgp")
+ (method . mime-article/view-application/pgp)
+ ))
+
+
+;;; @ Internal method for application/pgp-signature
+;;;
+;;; It is based on RFC 2015.
+
+(defvar mime-pgp-default-language 'en
+ "*Symbol of language for pgp.
+It should be ISO 639 2 letter language code such as en, ja, ...")
+
+(defvar mime-pgp-good-signature-regexp-alist
+ '((en . "Good signature from user.*$"))
+ "Alist of language vs regexp to detect ``Good signature''.")
+
+(defvar mime-pgp-key-expected-regexp-alist
+ '((en . "Key matching expected Key ID \\(\\S +\\) not found"))
+ "Alist of language vs regexp to detect ``Key expected''.")
+
+(defun mime::article/call-pgp-to-check-signature (output-buffer orig-file)
+ (save-excursion
+ (set-buffer output-buffer)
+ (erase-buffer)
+ )
+ (let* ((lang (or mime-pgp-default-language 'en))
+ (status
+ (call-process-region (point-min)(point-max)
+ "pgp" nil output-buffer nil orig-file
+ (format "+language=%s" lang)
+ ))
+ (regexp (cdr (assq lang mime-pgp-good-signature-regexp-alist)))
+ )
+ (if (= status 0)
+ (save-excursion
+ (set-buffer output-buffer)
+ (goto-char (point-min))
+ (message
+ (cond ((not (stringp regexp))
+ "Please specify right regexp for specified language")
+ ((re-search-forward regexp nil t)
+ (buffer-substring (match-beginning 0) (match-end 0))
+ )
+ (t
+ "Bad signature"
+ )))
+ ))))
+
+(defun mime-article/check-pgp-signature (beg end cal)
+ (let* ((encoding (cdr (assq 'encoding cal)))
+ (cnum (mime-article/point-content-number beg))
+ (rcnum (reverse cnum))
+ (rmcnum (cdr rcnum))
+ (knum (car rcnum))
+ (onum (if (> knum 0)
+ (1- knum)
+ (1+ knum)))
+ (oinfo (mime-article/rcnum-to-cinfo (cons onum rmcnum)
+ mime::article/content-info))
+ status str kbuf
+ (basename (expand-file-name "tm" mime/tmp-dir))
+ (orig-file (make-temp-name basename))
+ (sig-file (concat orig-file ".sig"))
+ )
+ (save-excursion
+ (setq str (buffer-substring
+ (mime::content-info/point-min oinfo)
+ (mime::content-info/point-max oinfo)
+ ))
+ (set-buffer (get-buffer-create mime/temp-buffer-name))
+ (insert str)
+ (goto-char (point-min))
+ (while (re-search-forward "\n" nil t)
+ (replace-match "\r\n")
+ )
+ (as-binary-output-file (write-file orig-file))
+ (kill-buffer (current-buffer))
+ )
+ (save-excursion
+ (mime-article/show-output-buffer)
+ )
+ (save-excursion
+ (setq str (buffer-substring
+ (save-excursion
+ (goto-char beg)
+ (and (search-forward "\n\n")
+ (match-end 0)))
+ end))
+ (set-buffer (setq kbuf (get-buffer-create mime/temp-buffer-name)))
+ (insert str)
+ (mime-decode-region (point-min)(point-max) encoding)
+ (as-binary-output-file (write-file sig-file))
+ (or (mime::article/call-pgp-to-check-signature
+ mime/output-buffer-name orig-file)
+ (let (pgp-id)
+ (save-excursion
+ (set-buffer mime/output-buffer-name)
+ (goto-char (point-min))
+ (let ((regexp (cdr (assq (or mime-pgp-default-language 'en)
+ mime-pgp-key-expected-regexp-alist))))
+ (cond ((not (stringp regexp))
+ (message
+ "Please specify right regexp for specified language")
+ )
+ ((re-search-forward regexp nil t)
+ (setq pgp-id
+ (concat "0x" (buffer-substring-no-properties
+ (match-beginning 1)
+ (match-end 1))))
+ ))))
+ (if (and pgp-id
+ (y-or-n-p
+ (format "Key %s not found; attempt to fetch? " pgp-id))
+ )
+ (progn
+ (funcall (pgp-function 'fetch-key) (cons nil pgp-id))
+ (mime::article/call-pgp-to-check-signature
+ mime/output-buffer-name orig-file)
+ ))
+ ))
+ (let ((other-window-scroll-buffer mime/output-buffer-name))
+ (scroll-other-window 8)
+ )
+ (kill-buffer kbuf)
+ (delete-file orig-file)
+ (delete-file sig-file)
+ )))
+
+(set-atype 'mime/content-decoding-condition
+ '((type . "application/pgp-signature")
+ (method . mime-article/check-pgp-signature)
+ ))
+
+
+;;; @ Internal method for application/pgp-encrypted
+;;;
+;;; It is based on RFC 2015.
+
+(defun mime-article/decrypt-pgp (beg end cal)
+ (let* ((cnum (mime-article/point-content-number beg))
+ (rcnum (reverse cnum))
+ (rmcnum (cdr rcnum))
+ (knum (car rcnum))
+ (onum (if (> knum 0)
+ (1- knum)
+ (1+ knum)))
+ (oinfo (mime-article/rcnum-to-cinfo (cons onum rmcnum)
+ mime::article/content-info))
+ (obeg (mime::content-info/point-min oinfo))
+ (oend (mime::content-info/point-max oinfo))
+ )
+ (mime-article/view-application/pgp obeg oend cal)
+ ))
+
+(set-atype 'mime/content-decoding-condition
+ '((type . "application/pgp-encrypted")
+ (method . mime-article/decrypt-pgp)
+ ))
+
+
+;;; @ Internal method for application/pgp-keys
+;;;
+;;; It is based on RFC 2015.
+
+(defun mime-article/add-pgp-keys (beg end cal)
+ (let* ((cnum (mime-article/point-content-number beg))
+ (cur-buf (current-buffer))
+ (new-name (format "%s-%s" (buffer-name) cnum))
+ (mother mime::article/preview-buffer)
+ (charset (cdr (assoc "charset" cal)))
+ (encoding (cdr (assq 'encoding cal)))
+ (mode major-mode)
+ str)
+ (setq str (buffer-substring beg end))
+ (switch-to-buffer new-name)
+ (setq buffer-read-only nil)
+ (erase-buffer)
+ (insert str)
+ (goto-char (point-min))
+ (if (re-search-forward "^\n" nil t)
+ (delete-region (point-min) (match-end 0))
+ )
+ (mime-decode-region (point-min)(point-max) encoding)
+ (funcall (pgp-function 'snarf-keys))
+ (kill-buffer (current-buffer))
+ ))
+
+(set-atype 'mime/content-decoding-condition
+ '((type . "application/pgp-keys")
+ (method . mime-article/add-pgp-keys)
+ ))
+
+
+;;; @ end
+;;;
+
+(provide 'mime-pgp)
+
+(run-hooks 'mime-pgp-load-hook)
+
+;;; mime-pgp.el ends here
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