(require 'epa)
-(defgroup 'epa-file
+(defgroup epa-file nil
"The EasyPG Assistant hooks for transparent file encryption"
:group 'epa)
:group 'epa-file)
(defvar epa-file nil)
+(defvar epa-passphrase nil)
+(defun epa-file-passphrase-callback-function (key-id buffer)
+ (save-excursion
+ (set-buffer buffer)
+ (if (and (eq key-id 'SYM)
+ epa-file)
+ (or epa-passphrase
+ (let ((passphrase (epg-passphrase-callback-function
+ key-id buffer)))
+ (setq epa-passphrase (copy-sequence passphrase))
+ passphrase))
+ (epg-passphrase-callback-function key-id buffer))))
+
+(defvar last-coding-system-used)
(defun epa-find-file ()
(when (string-match epa-file-name-regexp (buffer-file-name))
- (if (= (buffer-size) 0)
- (progn
- (set-auto-mode)
- (hack-local-variables)
- (auto-save-mode nil))
+ (when (file-exists-p (expand-file-name (buffer-file-name)))
+ (if (fboundp 'set-buffer-multibyte)
+ (set-buffer-multibyte t))
(goto-char (point-min))
- (insert (epg-decrypt-file (epg-make-context)
- (expand-file-name (buffer-file-name))
- nil))
- (delete-region (point) (point-max)))
+ (let ((context (epg-make-context)))
+ (epg-context-set-passphrase-callback
+ context
+ (cons #'epa-file-passphrase-callback-function
+ (current-buffer)))
+ (insert (epg-decrypt-file context
+ (expand-file-name (buffer-file-name))
+ nil)))
+ (delete-region (point) (point-max))
+ (decode-coding-region (point-min) (point-max) 'undecided)
+ (if (boundp 'last-coding-system-used)
+ (set-buffer-file-coding-system last-coding-system-used))
+ (set-auto-mode)
+ (hack-local-variables)
+ (auto-save-mode nil)
+ (set-buffer-modified-p nil)
+ (setq buffer-undo-list nil))
(make-local-variable 'epa-file)
- (setq epa-file (buffer-file-name))))
+ (setq epa-file (buffer-file-name))
+ (make-local-variable 'epa-passphrase)))
(defun epa-write-file ()
(when epa-file
- (write-region
- (epg-encrypt-string
- (epg-make-context)
- (buffer-string)
- (mapcar (lambda (key)
- (epg-sub-key-id
- (car (epg-key-sub-key-list key))))
- (epa-select-keys
- "Select recipents for encryption.
-If no one is selected, symmetric encryption will be performed. ")))
- nil (expand-file-name (buffer-file-name)))
+ (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))
+ (coding-system-for-write 'binary)
+ (context (epg-make-context)))
+ (epg-context-set-passphrase-callback
+ context
+ (cons #'epa-file-passphrase-callback-function
+ (current-buffer)))
+ (write-region
+ (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 epa-passphrase
+ (epa-select-keys
+ "Select recipents for encryption.
+If no one is selected, symmetric encryption will be performed. "))))
+ nil (expand-file-name (buffer-file-name))))
+ (set-visited-file-modtime)
(set-buffer-modified-p nil)
t))