--- /dev/null
+;;; mml1991.el --- Old PGP message format (RFC 1991) support for MML
+
+;; Copyright (C) 1998-2016 Free Software Foundation, Inc.
+
+;; Author: Sascha Lüdecke <sascha@meta-x.de>,
+;; Simon Josefsson <simon@josefsson.org> (Mailcrypt interface, Gnus glue)
+;; Keywords: PGP
+
+;; 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 3 of the License, 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. If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;;; Code:
+
+(eval-and-compile
+ (if (locate-library "password-cache")
+ (require 'password-cache)
+ (require 'password)))
+
+(eval-when-compile
+ (require 'cl)
+ (require 'mm-util))
+
+(require 'mm-encode)
+(require 'mml-sec)
+
+(defvar mc-pgp-always-sign)
+
+(autoload 'quoted-printable-decode-region "qp")
+(autoload 'quoted-printable-encode-region "qp")
+
+(autoload 'mm-decode-content-transfer-encoding "mm-bodies")
+(autoload 'mm-encode-content-transfer-encoding "mm-bodies")
+(autoload 'message-options-get "message")
+(autoload 'message-options-set "message")
+
+(require 'mml2015)
+
+(defvar mml1991-use mml2015-use
+ "The package used for PGP.")
+
+(defvar mml1991-function-alist
+ '((mailcrypt mml1991-mailcrypt-sign
+ mml1991-mailcrypt-encrypt)
+ (pgg mml1991-pgg-sign
+ mml1991-pgg-encrypt)
+ (epg mml1991-epg-sign
+ mml1991-epg-encrypt))
+ "Alist of PGP functions.")
+
+(defvar mml1991-cache-passphrase mml-secure-cache-passphrase
+ "If t, cache passphrase.")
+(make-obsolete-variable 'mml1991-cache-passphrase
+ 'mml-secure-cache-passphrase
+ "25.1")
+
+(defvar mml1991-passphrase-cache-expiry mml-secure-passphrase-cache-expiry
+ "How many seconds the passphrase is cached.
+Whether the passphrase is cached at all is controlled by
+`mml1991-cache-passphrase'.")
+(make-obsolete-variable 'mml1991-passphrase-cache-expiry
+ 'mml-secure-passphrase-cache-expiry
+ "25.1")
+
+(defvar mml1991-signers nil
+ "A list of your own key ID which will be used to sign a message.")
+
+(defvar mml1991-encrypt-to-self nil
+ "If t, add your own key ID to recipient list when encryption.")
+
+
+;;; mailcrypt wrapper
+
+(autoload 'mc-sign-generic "mc-toplev")
+
+(defvar mml1991-decrypt-function 'mailcrypt-decrypt)
+(defvar mml1991-verify-function 'mailcrypt-verify)
+
+(defun mml1991-mailcrypt-sign (cont)
+ (let ((text (current-buffer))
+ headers signature
+ (result-buffer (get-buffer-create "*GPG Result*")))
+ ;; Save MIME Content[^ ]+: headers from signing
+ (goto-char (point-min))
+ (while (looking-at "^Content[^ ]+:") (forward-line))
+ (unless (bobp)
+ (setq headers (buffer-string))
+ (delete-region (point-min) (point)))
+ (goto-char (point-max))
+ (unless (bolp)
+ (insert "\n"))
+ (quoted-printable-decode-region (point-min) (point-max))
+ (with-temp-buffer
+ (setq signature (current-buffer))
+ (insert-buffer-substring text)
+ (unless (mc-sign-generic (message-options-get 'message-sender)
+ nil nil nil nil)
+ (unless (> (point-max) (point-min))
+ (pop-to-buffer result-buffer)
+ (error "Sign error")))
+ (goto-char (point-min))
+ (while (re-search-forward "\r+$" nil t)
+ (replace-match "" t t))
+ (quoted-printable-encode-region (point-min) (point-max))
+ (set-buffer text)
+ (delete-region (point-min) (point-max))
+ (if headers (insert headers))
+ (insert "\n")
+ (insert-buffer-substring signature)
+ (goto-char (point-max)))))
+
+(declare-function mc-encrypt-generic "ext:mc-toplev"
+ (&optional recipients scheme start end from sign))
+
+(defun mml1991-mailcrypt-encrypt (cont &optional sign)
+ (let ((text (current-buffer))
+ (mc-pgp-always-sign
+ (or mc-pgp-always-sign
+ sign
+ (eq t (or (message-options-get 'message-sign-encrypt)
+ (message-options-set
+ 'message-sign-encrypt
+ (or (y-or-n-p "Sign the message? ")
+ 'not))))
+ 'never))
+ cipher
+ (result-buffer (get-buffer-create "*GPG Result*")))
+ ;; Strip MIME Content[^ ]: headers since it will be ASCII ARMORED
+ (goto-char (point-min))
+ (while (looking-at "^Content[^ ]+:") (forward-line))
+ (unless (bobp)
+ (delete-region (point-min) (point)))
+ (with-temp-buffer
+ (inline (mm-disable-multibyte))
+ (setq cipher (current-buffer))
+ (insert-buffer-substring text)
+ (unless (mc-encrypt-generic
+ (or
+ (message-options-get 'message-recipients)
+ (message-options-set 'message-recipients
+ (read-string "Recipients: ")))
+ nil
+ (point-min) (point-max)
+ (message-options-get 'message-sender)
+ 'sign)
+ (unless (> (point-max) (point-min))
+ (pop-to-buffer result-buffer)
+ (error "Encrypt error")))
+ (goto-char (point-min))
+ (while (re-search-forward "\r+$" nil t)
+ (replace-match "" t t))
+ (set-buffer text)
+ (delete-region (point-min) (point-max))
+ ;;(insert "Content-Type: application/pgp-encrypted\n\n")
+ ;;(insert "Version: 1\n\n")
+ (insert "\n")
+ (insert-buffer-substring cipher)
+ (goto-char (point-max)))))
+
+;; pgg wrapper
+
+(autoload 'pgg-sign-region "pgg")
+(autoload 'pgg-encrypt-region "pgg")
+
+(defvar pgg-default-user-id)
+(defvar pgg-errors-buffer)
+(defvar pgg-output-buffer)
+
+(defun mml1991-pgg-sign (cont)
+ (let ((pgg-text-mode t)
+ (pgg-default-user-id (or (message-options-get 'mml-sender)
+ pgg-default-user-id))
+ headers cte)
+ ;; Don't sign headers.
+ (goto-char (point-min))
+ (when (re-search-forward "^$" nil t)
+ (setq headers (buffer-substring (point-min) (point)))
+ (save-restriction
+ (narrow-to-region (point-min) (point))
+ (setq cte (mail-fetch-field "content-transfer-encoding")))
+ (forward-line 1)
+ (delete-region (point-min) (point))
+ (when cte
+ (setq cte (intern (downcase cte)))
+ (mm-decode-content-transfer-encoding cte)))
+ (unless (pgg-sign-region (point-min) (point-max) t)
+ (pop-to-buffer pgg-errors-buffer)
+ (error "Encrypt error"))
+ (delete-region (point-min) (point-max))
+ (mm-with-unibyte-current-buffer
+ (insert-buffer-substring pgg-output-buffer)
+ (goto-char (point-min))
+ (while (re-search-forward "\r+$" nil t)
+ (replace-match "" t t))
+ (when cte
+ (mm-encode-content-transfer-encoding cte))
+ (goto-char (point-min))
+ (when headers
+ (insert headers))
+ (insert "\n"))
+ t))
+
+(defun mml1991-pgg-encrypt (cont &optional sign)
+ (goto-char (point-min))
+ (when (re-search-forward "^$" nil t)
+ (let ((cte (save-restriction
+ (narrow-to-region (point-min) (point))
+ (mail-fetch-field "content-transfer-encoding"))))
+ ;; Strip MIME headers since it will be ASCII armored.
+ (forward-line 1)
+ (delete-region (point-min) (point))
+ (when cte
+ (mm-decode-content-transfer-encoding (intern (downcase cte))))))
+ (unless (let ((pgg-text-mode t))
+ (pgg-encrypt-region
+ (point-min) (point-max)
+ (split-string
+ (or
+ (message-options-get 'message-recipients)
+ (message-options-set 'message-recipients
+ (read-string "Recipients: ")))
+ "[ \f\t\n\r\v,]+")
+ sign))
+ (pop-to-buffer pgg-errors-buffer)
+ (error "Encrypt error"))
+ (delete-region (point-min) (point-max))
+ (insert "\n")
+ (insert-buffer-substring pgg-output-buffer)
+ t)
+
+;; epg wrapper
+
+(defvar epg-user-id-alist)
+
+(autoload 'epg-make-context "epg")
+(autoload 'epg-passphrase-callback-function "epg")
+(autoload 'epa-select-keys "epa")
+(autoload 'epg-list-keys "epg")
+(autoload 'epg-context-set-armor "epg")
+(autoload 'epg-context-set-textmode "epg")
+(autoload 'epg-context-set-signers "epg")
+(autoload 'epg-context-set-passphrase-callback "epg")
+(autoload 'epg-key-sub-key-list "epg")
+(autoload 'epg-sub-key-capability "epg")
+(autoload 'epg-sub-key-validity "epg")
+(autoload 'epg-sub-key-fingerprint "epg")
+(autoload 'epg-sign-string "epg")
+(autoload 'epg-encrypt-string "epg")
+(autoload 'epg-configuration "epg-config")
+(autoload 'epg-expand-group "epg-config")
+
+(defun mml1991-epg-sign (cont)
+ (let ((inhibit-redisplay t)
+ headers cte)
+ ;; Don't sign headers.
+ (goto-char (point-min))
+ (when (re-search-forward "^$" nil t)
+ (setq headers (buffer-substring (point-min) (point)))
+ (save-restriction
+ (narrow-to-region (point-min) (point))
+ (setq cte (mail-fetch-field "content-transfer-encoding")))
+ (forward-line 1)
+ (delete-region (point-min) (point))
+ (when cte
+ (setq cte (intern (downcase cte)))
+ (mm-decode-content-transfer-encoding cte)))
+ (let* ((pair (mml-secure-epg-sign 'OpenPGP 'clear))
+ (signature (car pair)))
+ (delete-region (point-min) (point-max))
+ (mm-with-unibyte-current-buffer
+ (insert signature)
+ (goto-char (point-min))
+ (while (re-search-forward "\r+$" nil t)
+ (replace-match "" t t))
+ (when cte
+ (mm-encode-content-transfer-encoding cte))
+ (goto-char (point-min))
+ (when headers
+ (insert headers))
+ (insert "\n"))
+ t)))
+
+(defun mml1991-epg-encrypt (cont &optional sign)
+ (goto-char (point-min))
+ (when (re-search-forward "^$" nil t)
+ (let ((cte (save-restriction
+ (narrow-to-region (point-min) (point))
+ (mail-fetch-field "content-transfer-encoding"))))
+ ;; Strip MIME headers since it will be ASCII armored.
+ (forward-line 1)
+ (delete-region (point-min) (point))
+ (when cte
+ (mm-decode-content-transfer-encoding (intern (downcase cte))))))
+ (let ((cipher (mml-secure-epg-encrypt 'OpenPGP cont sign)))
+ (delete-region (point-min) (point-max))
+ (insert "\n" cipher))
+ t)
+
+;;;###autoload
+(defun mml1991-encrypt (cont &optional sign)
+ (let ((func (nth 2 (assq mml1991-use mml1991-function-alist))))
+ (if func
+ (funcall func cont sign)
+ (error "Cannot find encrypt function"))))
+
+;;;###autoload
+(defun mml1991-sign (cont)
+ (let ((func (nth 1 (assq mml1991-use mml1991-function-alist))))
+ (if func
+ (funcall func cont)
+ (error "Cannot find sign function"))))
+
+(provide 'mml1991)
+
+;; Local Variables:
+;; coding: utf-8
+;; End:
+
+;;; mml1991.el ends here
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