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;;; pgg-pgp.el --- PGP 2.* and 6.* support for PGG.
;; Copyright (C) 1999-2000, 2002-2021 Free Software Foundation, Inc.
;; Author: Daiki Ueno <ueno@unixuser.org>
;; Created: 1999/11/02
;; Keywords: PGP, OpenPGP
;; Package: pgg
;; Obsolete-since: 24.1
;; 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 <https://www.gnu.org/licenses/>.
;;; Code:
(eval-when-compile (require 'cl-lib))
(require 'pgg)
(defgroup pgg-pgp ()
"PGP 2.* and 6.* interface."
:group 'pgg)
(defcustom pgg-pgp-program "pgp"
"PGP 2.* and 6.* executable."
:group 'pgg-pgp
:type 'string)
(defcustom pgg-pgp-shell-file-name "/bin/sh"
"File name to load inferior shells from.
Bourne shell or its equivalent \(not tcsh) is needed for \"2>\"."
:group 'pgg-pgp
:type 'string)
(defcustom pgg-pgp-shell-command-switch "-c"
"Switch used to have the shell execute its command line argument."
:group 'pgg-pgp
:type 'string)
(defcustom pgg-pgp-extra-args nil
"Extra arguments for every PGP invocation."
:group 'pgg-pgp
:type '(choice
(const :tag "None" nil)
(string :tag "Arguments")))
(defvar pgg-pgp-user-id nil
"PGP ID of your default identity.")
(defun pgg-pgp-process-region (start end passphrase program args)
(let* ((errors-file-name (pgg-make-temp-file "pgg-errors"))
(args
(concat args
pgg-pgp-extra-args
" 2>" (shell-quote-argument errors-file-name)))
(shell-file-name pgg-pgp-shell-file-name)
(shell-command-switch pgg-pgp-shell-command-switch)
(process-environment process-environment)
(output-buffer pgg-output-buffer)
(errors-buffer pgg-errors-buffer)
(process-connection-type nil)
process status exit-status)
(with-current-buffer (get-buffer-create output-buffer)
(buffer-disable-undo)
(erase-buffer))
(when passphrase
(setenv "PGPPASSFD" "0"))
(unwind-protect
(progn
(let ((coding-system-for-read 'binary)
(coding-system-for-write 'binary))
(setq process
(start-process-shell-command "*PGP*" output-buffer
(concat program " " args))))
(set-process-sentinel process #'ignore)
(when passphrase
(process-send-string process (concat passphrase "\n")))
(process-send-region process start end)
(process-send-eof process)
(while (eq 'run (process-status process))
(accept-process-output process 5))
(setq status (process-status process)
exit-status (process-exit-status process))
(delete-process process)
(with-current-buffer output-buffer
(pgg-convert-lbt-region (point-min)(point-max) 'LF)
(if (memq status '(stop signal))
(error "%s exited abnormally: `%s'" program exit-status))
(if (= 127 exit-status)
(error "%s could not be found" program))
(set-buffer (get-buffer-create errors-buffer))
(buffer-disable-undo)
(erase-buffer)
(insert-file-contents errors-file-name)))
(if (and process (eq 'run (process-status process)))
(interrupt-process process))
(condition-case nil
(delete-file errors-file-name)
(file-error nil)))))
(defun pgg-pgp-lookup-key (string &optional type)
"Search keys associated with STRING."
(let ((args (list "+batchmode" "+language=en" "-kv" string)))
(with-current-buffer (get-buffer-create pgg-output-buffer)
(buffer-disable-undo)
(erase-buffer)
(apply #'call-process pgg-pgp-program nil t nil args)
(goto-char (point-min))
(cond
((re-search-forward "^pub\\s +[0-9]+/" nil t);PGP 2.*
(buffer-substring (point)(+ 8 (point))))
((re-search-forward "^Type" nil t);PGP 6.*
(beginning-of-line 2)
(substring
(nth 2 (split-string
(buffer-substring (point)(progn (end-of-line) (point)))))
2))))))
(defun pgg-pgp-encrypt-region (start end recipients &optional sign passphrase)
"Encrypt the current region between START and END."
(let* ((pgg-pgp-user-id (or pgg-pgp-user-id pgg-default-user-id))
(passphrase (or passphrase
(when sign
(pgg-read-passphrase
(format "PGP passphrase for %s: "
pgg-pgp-user-id)
pgg-pgp-user-id))))
(args
(concat
"+encrypttoself=off +verbose=1 +batchmode +language=us -fate "
(if (or recipients pgg-encrypt-for-me)
(mapconcat 'shell-quote-argument
(append recipients
(if pgg-encrypt-for-me
(list pgg-pgp-user-id))) " "))
(if sign (concat " -s -u " (shell-quote-argument pgg-pgp-user-id))))))
(pgg-pgp-process-region start end nil pgg-pgp-program args)
(pgg-process-when-success nil)))
(defun pgg-pgp-decrypt-region (start end &optional passphrase)
"Decrypt the current region between START and END.
If optional PASSPHRASE is not specified, it will be obtained from the
passphrase cache or user."
(let* ((pgg-pgp-user-id (or pgg-pgp-user-id pgg-default-user-id))
(key (pgg-pgp-lookup-key pgg-pgp-user-id 'encrypt))
(passphrase
(or passphrase
(pgg-read-passphrase
(format "PGP passphrase for %s: " pgg-pgp-user-id) key)))
(args
"+verbose=1 +batchmode +language=us -f"))
(pgg-pgp-process-region start end passphrase pgg-pgp-program args)
(pgg-process-when-success
(if pgg-cache-passphrase
(pgg-add-passphrase-to-cache key passphrase)))))
(defun pgg-pgp-sign-region (start end &optional clearsign passphrase)
"Make detached signature from text between START and END.
If optional PASSPHRASE is not specified, it will be obtained from the
passphrase cache or user."
(let* ((pgg-pgp-user-id (or pgg-pgp-user-id pgg-default-user-id))
(passphrase
(or passphrase
(pgg-read-passphrase
(format "PGP passphrase for %s: " pgg-pgp-user-id)
(pgg-pgp-lookup-key pgg-pgp-user-id 'sign))))
(args
(concat (if clearsign "-fast" "-fbast")
" +verbose=1 +language=us +batchmode"
" -u " (shell-quote-argument pgg-pgp-user-id))))
(pgg-pgp-process-region start end passphrase pgg-pgp-program args)
(pgg-process-when-success
(goto-char (point-min))
(when (re-search-forward "^-+BEGIN PGP" nil t);XXX
(let ((packet
(cdr (assq 2 (pgg-parse-armor-region
(progn (beginning-of-line 2)
(point))
(point-max))))))
(if pgg-cache-passphrase
(pgg-add-passphrase-to-cache
(cdr (assq 'key-identifier packet))
passphrase)))))))
(defun pgg-pgp-verify-region (start end &optional signature)
"Verify region between START and END as the detached signature SIGNATURE."
(let* ((orig-file (pgg-make-temp-file "pgg"))
(args "+verbose=1 +batchmode +language=us"))
(with-file-modes 448
(let ((coding-system-for-write 'binary)
jka-compr-compression-info-list jam-zcat-filename-list)
(write-region start end orig-file)))
(if (stringp signature)
(progn
(copy-file signature (setq signature (concat orig-file ".asc")))
(setq args (concat args " " (shell-quote-argument signature)))))
(setq args (concat args " " (shell-quote-argument orig-file)))
(pgg-pgp-process-region (point)(point) nil pgg-pgp-program args)
(delete-file orig-file)
(if signature (delete-file signature))
(pgg-process-when-success
(goto-char (point-min))
(let ((case-fold-search t))
(while (re-search-forward "^warning: " nil t)
(delete-region (match-beginning 0)
(progn (beginning-of-line 2) (point)))))
(goto-char (point-min))
(when (re-search-forward "^\\.$" nil t)
(delete-region (point-min)
(progn (beginning-of-line 2)
(point)))))))
(defun pgg-pgp-insert-key ()
"Insert public key at point."
(let* ((pgg-pgp-user-id (or pgg-pgp-user-id pgg-default-user-id))
(args
(concat "+verbose=1 +batchmode +language=us -kxaf "
(shell-quote-argument pgg-pgp-user-id))))
(pgg-pgp-process-region (point)(point) nil pgg-pgp-program args)
(insert-buffer-substring pgg-output-buffer)))
(defun pgg-pgp-snarf-keys-region (start end)
"Add all public keys in region between START and END to the keyring."
(let* ((pgg-pgp-user-id (or pgg-pgp-user-id pgg-default-user-id))
(key-file (pgg-make-temp-file "pgg"))
(args
(concat "+verbose=1 +batchmode +language=us -kaf "
(shell-quote-argument key-file))))
(let ((coding-system-for-write 'raw-text-dos))
(write-region start end key-file))
(pgg-pgp-process-region start end nil pgg-pgp-program args)
(delete-file key-file)
(pgg-process-when-success nil)))
(provide 'pgg-pgp)
;;; pgg-pgp.el ends here
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