-;;; epa-file.el --- the EasyPG Assistant hooks for transparent file encryption
+;;; epa-file.el --- the EasyPG Assistant, transparent file encryption
;; Copyright (C) 2006 Daiki Ueno
;; Author: Daiki Ueno <ueno@unixuser.org>
"Regexp which matches filenames to be encrypted with GnuPG."
:type 'regexp
:group 'epa-file)
-
+
+(defcustom epa-file-cache-passphrase-for-symmetric-encryption nil
+ "If non-nil, cache passphrase for symmetric encryption."
+ :type 'boolean
+ :group 'epa-file)
+
+(defcustom epa-file-inhibit-auto-save t
+ "If non-nil, disable auto-saving when opening an encrypted file."
+ :type 'boolean
+ :group 'epa-file)
+
+(defvar epa-file-encrypt-to nil
+ "*Recipient(s) used for encrypting files.
+May either be a string or a list of strings.")
+
+;;;###autoload
+(put 'epa-file-encrypt-to 'safe-local-variable
+ (lambda (val)
+ (or (stringp val)
+ (and (listp val)
+ (catch 'safe
+ (mapc (lambda (elt)
+ (unless (stringp elt)
+ (throw 'safe nil)))
+ val)
+ t)))))
+
+(defvar epa-file-handler
+ (cons epa-file-name-regexp 'epa-file-handler))
+
(defvar epa-file-passphrase-alist nil)
-(defun epa-file-passphrase-callback-function (key-id file)
- (if (eq key-id 'SYM)
+(if (fboundp 'encode-coding-string)
+ (defalias 'epa-file--encode-coding-string 'encode-coding-string)
+ (defalias 'epa-file--encode-coding-string 'identity))
+
+(if (fboundp 'decode-coding-string)
+ (defalias 'epa-file--decode-coding-string 'decode-coding-string)
+ (defalias 'epa-file--decode-coding-string 'identity))
+
+(defun epa-file-passphrase-callback-function (context key-id file)
+ (if (and epa-file-cache-passphrase-for-symmetric-encryption
+ (eq key-id 'SYM))
(let ((entry (assoc file epa-file-passphrase-alist))
passphrase)
(or (copy-sequence (cdr entry))
(setq entry (list file)
epa-file-passphrase-alist (cons entry
epa-file-passphrase-alist)))
- (setq passphrase (epg-passphrase-callback-function key-id nil))
+ (setq passphrase (epa-passphrase-callback-function context
+ key-id nil))
(setcdr entry (copy-sequence passphrase))
passphrase)))
- (epg-passphrase-callback-function key-id nil)))
+ (epa-passphrase-callback-function context key-id nil)))
(defun epa-file-handler (operation &rest args)
(save-match-data
(inhibit-file-name-operation operation))
(apply operation args)))
+(defun epa-file-decode-and-insert (string file visit beg end replace)
+ (if (fboundp 'decode-coding-inserted-region)
+ (save-restriction
+ (narrow-to-region (point) (point))
+ (let ((multibyte enable-multibyte-characters))
+ (set-buffer-multibyte nil)
+ (insert string)
+ (set-buffer-multibyte multibyte)
+ (decode-coding-inserted-region
+ (point-min) (point-max)
+ (substring file 0 (string-match epa-file-name-regexp file))
+ visit beg end replace)))
+ (insert (epa-file--decode-coding-string string (or coding-system-for-read
+ 'undecided)))))
+
(defvar last-coding-system-used)
(defun epa-file-insert-file-contents (file &optional visit beg end replace)
(barf-if-buffer-read-only)
- (if (or beg end)
- (error "Can't read the file partially."))
+ (if (and visit (or beg end))
+ (error "Attempt to visit less than an entire file"))
+ (if epa-file-inhibit-auto-save
+ (auto-save-mode 0))
(setq file (expand-file-name file))
(let ((local-copy (epa-file-run-real-handler #'file-local-copy (list file)))
(context (epg-make-context))
- point length entry)
+ string length entry)
(if visit
(setq buffer-file-name file))
(epg-context-set-passphrase-callback
context
(cons #'epa-file-passphrase-callback-function
file))
+ (epg-context-set-progress-callback context
+ #'epa-progress-callback-function)
(unwind-protect
(progn
(if replace
(goto-char (point-min)))
- (setq point (point))
(condition-case error
- (insert (epg-decrypt-file context file nil))
- (error (signal 'file-error
- (cons "Opening input file"
- (nthcdr 2 error)))))
- (setq length (- (point) point))
- (if replace
- (delete-region (point) (point-max)))
- (decode-coding-region point (point) 'undecided)
- (if (boundp 'last-coding-system-used)
- (set-buffer-file-coding-system last-coding-system-used)
- (set-buffer-file-coding-system default-buffer-file-coding-system))
- (goto-char point))
+ (setq string (epg-decrypt-file context file nil))
+ (error
+ (if (setq entry (assoc file epa-file-passphrase-alist))
+ (setcdr entry nil))
+ (signal 'file-error
+ (cons "Opening input file" (cdr error)))))
+ (if (or beg end)
+ (setq string (substring string (or beg 0) end)))
+ (save-excursion
+ (save-restriction
+ (narrow-to-region (point) (point))
+ (epa-file-decode-and-insert string file visit beg end replace)
+ (setq length (- (point-max) (point-min))))
+ (if replace
+ (delete-region (point) (point-max)))))
(if (and local-copy
(file-exists-p local-copy))
(delete-file local-copy)))
(if append
(error "Can't append to the file."))
(setq file (expand-file-name file))
- (let* ((coding-system (if (boundp 'last-coding-system-used)
- (condition-case nil
- (write-region (point-min) (point-max) "/")
- (error last-coding-system-used))
- buffer-file-coding-system))
+ (let* ((coding-system (or coding-system-for-write
+ (if (fboundp 'select-safe-coding-system)
+ ;; This is needed since Emacs 22 has
+ ;; no-conversion setting for *.gpg in
+ ;; `auto-coding-alist'.
+ (let ((buffer-file-name
+ (file-name-sans-extension file)))
+ (select-safe-coding-system
+ (point-min) (point-max)))
+ buffer-file-coding-system)))
(context (epg-make-context))
- (coding-system-for-write 'binary))
+ (coding-system-for-write 'binary)
+ string entry)
(epg-context-set-passphrase-callback
context
(cons #'epa-file-passphrase-callback-function
file))
+ (epg-context-set-progress-callback context
+ #'epa-progress-callback-function)
+ (condition-case error
+ (setq string
+ (epg-encrypt-string
+ context
+ (if (stringp start)
+ (epa-file--encode-coding-string start coding-system)
+ (epa-file--encode-coding-string (buffer-substring start end)
+ coding-system))
+ (unless (assoc file epa-file-passphrase-alist)
+ (epa-select-keys
+ context
+ "Select recipents for encryption.
+If no one is selected, symmetric encryption will be performed. "
+ (cond
+ ((listp epa-file-encrypt-to) epa-file-encrypt-to)
+ ((stringp epa-file-encrypt-to) (list epa-file-encrypt-to)))))))
+ (error
+ (if (setq entry (assoc file epa-file-passphrase-alist))
+ (setcdr entry nil))
+ (signal 'file-error (cons "Opening output file" (cdr error)))))
(epa-file-run-real-handler
#'write-region
- (list (epg-encrypt-string
- context
- (encode-coding-string (buffer-string) coding-system)
- (mapcar (lambda (key)
- (epg-sub-key-id (car (epg-key-sub-key-list key))))
- (unless (assoc file epa-file-passphrase-alist)
- (epa-select-keys
- "Select recipents for encryption.
-If no one is selected, symmetric encryption will be performed. "))))
- nil file append visit lockname mustbenew))
+ (list string nil file append visit lockname mustbenew))
(if (boundp 'last-coding-system-used)
(setq last-coding-system-used coding-system))
(if (eq visit t)
(message "Wrote %s" buffer-file-name))))
(put 'write-region 'epa-file 'epa-file-write-region)
+;;;###autoload
+(defun epa-file-enable ()
+ (interactive)
+ (if (memq epa-file-handler file-name-handler-alist)
+ (message "`epa-file' already enabled")
+ (setq file-name-handler-alist
+ (cons epa-file-handler file-name-handler-alist))
+ (message "`epa-file' enabled")))
+
+;;;###autoload
+(defun epa-file-disable ()
+ (interactive)
+ (if (memq epa-file-handler file-name-handler-alist)
+ (progn
+ (setq file-name-handler-alist
+ (delq epa-file-handler file-name-handler-alist))
+ (message "`epa-file' disabled"))
+ (message "`epa-file' already disabled")))
+
(provide 'epa-file)
;;; epa-file.el ends here
projects / elisp / epg.git / blobdiff