1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
|
;;; org-crypt.el --- Public key encryption for org-mode entries
;; Copyright (C) 2007, 2009, 2010, 2011, 2012 Free Software Foundation, Inc.
;; Emacs Lisp Archive Entry
;; Filename: org-crypt.el
;; Version: 6.33x
;; Keywords: org-mode
;; Author: John Wiegley <johnw@gnu.org>
;; Maintainer: Peter Jones <pjones@pmade.com>
;; Description: Adds public key encryption to org-mode buffers
;; URL: http://www.newartisans.com/software/emacs.html
;; Compatibility: Emacs22
;; 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:
;; Right now this is just a set of functions to play with. It depends
;; on the epg library. Here's how you would use it:
;;
;; 1. To mark an entry for encryption, tag the heading with "crypt".
;; You can change the tag to any complex tag matching string by
;; setting the `org-crypt-tag-matcher' variable.
;;
;; 2. Set the encryption key to use in the `org-crypt-key' variable,
;; or use `M-x org-set-property' to set the property CRYPTKEY to
;; any address in your public keyring. The text of the entry (but
;; not its properties or headline) will be encrypted for this user.
;; For them to read it, the corresponding secret key must be
;; located in the secret key ring of the account where you try to
;; decrypt it. This makes it possible to leave secure notes that
;; only the intended recipient can read in a shared-org-mode-files
;; scenario.
;;
;; 3. To later decrypt an entry, use `org-decrypt-entries' or
;; `org-decrypt-entry'. It might be useful to bind this to a key,
;; like C-c C-/. I hope that in the future, C-c C-r can be might
;; overloaded to also decrypt an entry if it's encrypted, since
;; that fits nicely with the meaning of "reveal".
;;
;; 4. To automatically encrypt all necessary entries when saving a
;; file, call `org-crypt-use-before-save-magic' after loading
;; org-crypt.el.
;;
;; TODO:
;; - Allow symmetric encryption as well
;;; Thanks:
;; - Carsten Dominik
;; - Vitaly Ostanin
(require 'org)
(declare-function epg-decrypt-string "epg" (context cipher))
(declare-function epg-list-keys "epg" (context &optional name mode))
(declare-function epg-make-context "epg"
(&optional protocol armor textmode include-certs
cipher-algorithm digest-algorithm
compress-algorithm))
(declare-function epg-encrypt-string "epg"
(context plain recipients &optional sign always-trust))
(defgroup org-crypt nil
"Org Crypt"
:tag "Org Crypt" :group 'org)
(defcustom org-crypt-tag-matcher "crypt"
"The tag matcher used to find headings whose contents should be
encrypted. See the \"Match syntax\" section of the org manual
for more details."
:type 'string :group 'org-crypt)
(defcustom org-crypt-key nil
"The default key to use when encrypting the contents of a
heading. This can also be overridden in the CRYPTKEY property."
:type 'string :group 'org-crypt)
(defun org-crypt-key-for-heading ()
"Returns the encryption key for the current heading."
(save-excursion
(org-back-to-heading t)
(or (org-entry-get nil "CRYPTKEY" 'selective)
org-crypt-key
(and (boundp 'epa-file-encrypt-to) epa-file-encrypt-to)
(error "No crypt key set"))))
(defun org-encrypt-entry ()
"Encrypt the content of the current headline."
(interactive)
(require 'epg)
(save-excursion
(org-back-to-heading t)
(forward-line)
(when (not (looking-at "-----BEGIN PGP MESSAGE-----"))
(let ((folded (org-invisible-p))
(epg-context (epg-make-context nil t t))
(crypt-key (org-crypt-key-for-heading))
(beg (point))
end encrypted-text)
(org-end-of-subtree t t)
(org-back-over-empty-lines)
(setq end (point)
encrypted-text
(epg-encrypt-string
epg-context
(buffer-substring-no-properties beg end)
(epg-list-keys epg-context crypt-key)))
(delete-region beg end)
(insert encrypted-text)
(when folded
(save-excursion
(org-back-to-heading t)
(hide-subtree)))
nil))))
(defun org-decrypt-entry ()
(interactive)
(require 'epg)
(save-excursion
(org-back-to-heading t)
(forward-line)
(when (looking-at "-----BEGIN PGP MESSAGE-----")
(let* ((beg (point))
(end (save-excursion
(search-forward "-----END PGP MESSAGE-----")
(forward-line)
(point)))
(epg-context (epg-make-context nil t t))
(decrypted-text
(decode-coding-string
(epg-decrypt-string
epg-context
(buffer-substring-no-properties beg end))
'utf-8)))
(delete-region beg end)
(insert decrypted-text)
nil))))
(defun org-encrypt-entries ()
(interactive)
(org-scan-tags
'org-encrypt-entry
(cdr (org-make-tags-matcher org-crypt-tag-matcher))))
(defun org-decrypt-entries ()
(interactive)
(org-scan-tags
'org-decrypt-entry
(cdr (org-make-tags-matcher org-crypt-tag-matcher))))
(defun org-crypt-use-before-save-magic ()
"Adds a hook that will automatically encrypt entries before a
file is saved to disk."
(add-hook
'org-mode-hook
(lambda () (add-hook 'before-save-hook 'org-encrypt-entries nil t))))
(provide 'org-crypt)
;; arch-tag: 8202ed2c-221e-4001-9e4b-54674a7e846e
;;; org-crypt.el ends here
|
