+++ /dev/null
-;;; encrypt.el --- file encryption routines
-;; Copyright (C) 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
-
-;; Author: Teodor Zlatanov <tzz@lifelogs.com>
-;; Created: 2003/01/24
-;; Keywords: files
-
-;; 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, 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; see the file COPYING. If not, write to the
-;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
-;; Boston, MA 02110-1301, USA.
-
-;;; Commentary:
-
-;;; This module addresses data encryption. Page breaks are used for
-;;; grouping declarations and documentation relating to each
-;;; particular aspect.
-
-;;; Use in Gnus like this:
-;;; (require 'encrypt)
-;;; (setq
-;;; nnimap-authinfo-file "~/.authinfo.enc"
-;;; nntp-authinfo-file "~/.authinfo.enc"
-;;; smtpmail-auth-credentials "~/.authinfo.enc"
-;;; ;; GnuPG using the AES256 cipher, feel free to use your own favorite
-;;; encrypt-file-alist (quote (("~/.authinfo.enc" (gpg "AES256"))))
-;;; password-cache-expiry 600)
-
-;;; Then write ~/.authinfo.enc:
-
-;;; 1) open the old authinfo
-;;; C-x C-f ~/.authinfo
-
-;;; 2) write the new authinfo.enc
-;;; M-x encrypt-write-file-contents RET ~/.authinfo.enc
-
-;;; 3) verify the new authinfo is correct
-;;; (this will insert the contents in the current buffer)
-
-;;; M-: (encrypt-insert-file-contents "~/.authinfo.enc")
-
-
-;;; Code:
-
-;; autoload password
-(eval-and-compile
- (if (locate-library "password-cache")
- (require 'password-cache)
- (require 'password)))
-
-(defgroup encrypt '((password-cache custom-variable)
- (password-cache-expiry custom-variable))
- "File encryption configuration."
- :group 'applications)
-
-(defcustom encrypt-file-alist nil
- "List of file names or regexes matched with encryptions.
-Format example:
- '((\"beta\"
- (gpg \"AES\"))
- (\"gamma\\\\*\"
- (pgg))
- (\"/home/tzz/alpha\"
- (encrypt-xor \"Semi-Secret\")))"
-
- :type '(repeat
- (list :tag "Encryption entry"
- (radio :tag "What to encrypt"
- (file :tag "Filename")
- (regexp :tag "Regular expression match"))
- (radio :tag "How to encrypt it"
- (list
- :tag "GPG Encryption via PGG (including passphrases)"
- (const :tag "GPG via PGG" pgg))
- (list
- :tag "GPG Encryption"
- (const :tag "GPG Program" gpg)
- (radio :tag "Choose a cipher"
- (const :tag "3DES Encryption" "3DES")
- (const :tag "CAST5 Encryption" "CAST5")
- (const :tag "Blowfish Encryption" "BLOWFISH")
- (const :tag "AES Encryption" "AES")
- (const :tag "AES192 Encryption" "AES192")
- (const :tag "AES256 Encryption" "AES256")
- (const :tag "Twofish Encryption" "TWOFISH")
- (string :tag "Cipher Name")))
- (list
- :tag "Built-in simple XOR"
- (const :tag "XOR Encryption" encrypt-xor)
- (string :tag "XOR Cipher Value (seed value)")))))
- :group 'encrypt)
-
-;; TODO: now, load gencrypt.el and if successful, modify the
-;; custom-type of encrypt-file-alist to add the gencrypt.el options
-
-;; (plist-get (symbol-plist 'encrypt-file-alist) 'custom-type)
-;; then use plist-put
-
-(defcustom encrypt-gpg-path (executable-find "gpg")
- "Path to the GPG program."
- :type '(radio
- (file :tag "Location of the GPG executable")
- (const :tag "GPG is not installed" nil))
- :group 'encrypt)
-
-(defvar encrypt-temp-prefix "encrypt"
- "Prefix for temporary filenames")
-
-;;;###autoload
-(defun encrypt-find-model (filename)
- "Given a filename, find a encrypt-file-alist entry"
- (dolist (entry encrypt-file-alist)
- (let ((match (nth 0 entry))
- (model (nth 1 entry)))
- (when (or (eq match filename)
- (string-match match filename))
- (return model)))))
-
-;;;###autoload
-(defun encrypt-insert-file-contents (file &optional model erase)
- "Decrypt FILE into the current buffer."
- (interactive "fFile to insert: ")
- (let* ((model (or model (encrypt-find-model file)))
- (method (nth 0 model))
- (cipher (nth 1 model))
- (passphrase (encrypt-get-passphrase-if-needed file method cipher t))
- (buffer-file-coding-system 'binary)
- (coding-system-for-read 'binary)
- outdata)
-
- ;; note we only insert-file-contents if the method is known to be valid
- (with-temp-buffer
- (cond
- ((eq method 'gpg)
- (insert-file-contents file)
- (setq outdata (encrypt-gpg-decode-buffer passphrase cipher)))
- ((eq method 'pgg)
- (insert-file-contents file)
- (setq outdata (encrypt-pgg-decode-buffer)))
- ((eq method 'encrypt-xor)
- (insert-file-contents file)
- (setq outdata (encrypt-xor-decode-buffer passphrase cipher)))))
-
- (if outdata
- (progn
- (message "%s was decrypted with %s"
- file
- (encrypt-message-method-and-cipher method cipher))
- (when erase
- (delete-region (point-min) (point-max)))
- (insert outdata))
- ;; the decryption failed, alas
- (password-cache-remove (encrypt-password-key file method cipher))
- (gnus-error 5 "%s was NOT decrypted with %s"
- file
- (encrypt-message-method-and-cipher method cipher)))))
-
-(defun encrypt-get-file-contents (file &optional model)
- "Decrypt FILE and return the contents."
- (interactive "fFile to decrypt: ")
- (with-temp-buffer
- (encrypt-insert-file-contents file model)
- (buffer-string)))
-
-(defun encrypt-put-file-contents (file data &optional model)
- "Encrypt the DATA to FILE, then continue normally."
- (with-temp-buffer
- (insert data)
- (encrypt-write-file-contents file model)))
-
-(defun encrypt-write-file-contents (file &optional model)
- "Encrypt the current buffer to FILE, then continue normally."
- (interactive "sFile to write: ")
- (setq model (or model (encrypt-find-model file)))
- (if model
- (let* ((method (nth 0 model))
- (cipher (nth 1 model))
- (passphrase
- (encrypt-get-passphrase-if-needed file method cipher))
- (outdata
- (cond
- ((eq method 'gpg)
- (encrypt-gpg-encode-buffer passphrase cipher))
- ((eq method 'pgg)
- (encrypt-pgg-encode-buffer))
- ((eq method 'encrypt-xor)
- (encrypt-xor-encode-buffer passphrase cipher)))))
-
- (if outdata
- (progn
- (message "%s was encrypted with %s"
- file
- (encrypt-message-method-and-cipher method cipher))
- (with-temp-buffer
- (insert outdata)
- ;; do not confirm overwrites
- (write-file file nil)))
- ;; the decryption failed, alas
- (password-cache-remove (encrypt-password-key file method cipher))
- (gnus-error 5 "%s was NOT encrypted with %s"
- file
- (encrypt-message-method-and-cipher method cipher))))
- (gnus-error
- 1
- "%s has no associated encryption model! See encrypt-file-alist."
- file)))
-
-(defun encrypt-password-key (file method cipher)
- (format "encrypt-password-%s-%s %s" (symbol-name method) cipher file))
-
-(defun encrypt-get-passphrase-if-needed (file method cipher &optional add)
- "Read the passphrase for FILE, METHOD, CIPHER if necessary."
- (when (not (eq method 'pgg))
- (let ((password-key (encrypt-password-key file method cipher))
- (password-question
- (format "password for %s (file %s)? "
- (encrypt-message-method-and-cipher method cipher)
- file)))
- (if add
- (password-read-and-add password-question password-key)
- (password-read password-question password-key)))))
-
-
-(defun encrypt-message-method-and-cipher (method cipher)
- (format "method %s%s"
- (symbol-name method)
- (if cipher (format " (cipher %s)" cipher) "")))
-
-(defun encrypt-xor-encode-buffer (passphrase cipher)
- (encrypt-xor-process-buffer passphrase cipher t))
-
-(defun encrypt-xor-decode-buffer (passphrase cipher)
- (encrypt-xor-process-buffer passphrase cipher nil))
-
-(defun encrypt-xor-process-buffer (passphrase
- cipher
- &optional encode)
- "Given PASSPHRASE, xor-encode or decode the contents of the current buffer."
- (let* ((bs (buffer-substring-no-properties (point-min) (point-max)))
- ;; passphrase-sum is a simple additive checksum of the
- ;; passphrase and the cipher
- (passphrase-sum
- (when (stringp passphrase)
- (apply '+ (append cipher passphrase nil))))
- new-list)
-
- (with-temp-buffer
- (if encode
- (progn
- (dolist (x (append bs nil))
- (setq new-list (cons (logxor x passphrase-sum) new-list)))
-
- (dolist (x new-list)
- (insert (format "%d " x))))
- (progn
- (setq new-list (reverse (split-string bs)))
- (dolist (x new-list)
- (setq x (string-to-number x))
- (insert (format "%c" (logxor x passphrase-sum))))))
- (buffer-substring-no-properties (point-min) (point-max)))))
-
-(defun encrypt-gpg-encode-buffer (passphrase cipher)
- (encrypt-gpg-process-buffer passphrase cipher t))
-
-(defun encrypt-gpg-decode-buffer (passphrase cipher)
- (encrypt-gpg-process-buffer passphrase cipher nil))
-
-(defun encrypt-gpg-process-buffer (passphrase
- cipher
- &optional encode)
- "With PASSPHRASE, use GPG to encode or decode the current buffer."
- (let* ((program encrypt-gpg-path)
- (input (buffer-substring-no-properties (point-min) (point-max)))
- (temp-maker (if (fboundp 'make-temp-file)
- 'make-temp-file
- 'make-temp-name))
- (temp-file (funcall temp-maker encrypt-temp-prefix))
- (default-enable-multibyte-characters nil)
- (args `("--cipher-algo" ,cipher
- "--status-fd" "2"
- "--logger-fd" "2"
- "--passphrase-fd" "0"
- "--no-tty"))
- exit-status exit-data)
-
- (when encode
- (setq args
- (append args
- '("--symmetric"
- "--armor"))))
-
- (if program
- (with-temp-buffer
- (when passphrase
- (insert passphrase "\n"))
- (insert input)
- (setq exit-status
- (apply #'call-process-region (point-min) (point-max) program
- t `(t ,temp-file) nil args))
- (if (equal exit-status 0)
- (setq exit-data
- (buffer-substring-no-properties (point-min) (point-max)))
- (with-temp-buffer
- (when (file-exists-p temp-file)
- (insert-file-contents temp-file))
- (gnus-error 5 (format "%s exited abnormally: '%s' [%s]"
- program exit-status (buffer-string)))))
- (delete-file temp-file))
- (gnus-error 5 "GPG is not installed."))
- exit-data))
-
-(defun encrypt-pgg-encode-buffer ()
- (encrypt-pgg-process-buffer t))
-
-(defun encrypt-pgg-decode-buffer ()
- (encrypt-pgg-process-buffer))
-
-(defun encrypt-pgg-process-buffer (&optional encode)
- "Use PGG to encode or decode the current buffer."
- (let ((pfft (if encode 'pgg-encrypt-symmetric 'pgg-decrypt))
- (default-enable-multibyte-characters nil)
- (input (buffer-substring-no-properties (point-min) (point-max)))
- exit-data)
- (with-temp-buffer
- (insert input)
- ;; note that we call pfft before pgg-display-output-buffer
- (pgg-display-output-buffer (point-min) (point-max) (funcall pfft))
- (setq exit-data
- (buffer-substring-no-properties (point-min) (point-max))))
- (debug exit-data)
- exit-data))
-
-(provide 'encrypt)
-
-;;; encrypt.el ends here
projects / gnus / commitdiff