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+;;; org-crypt.el --- Public Key Encryption for Org Entries -*- lexical-binding: t; -*-
+;;
+;; Copyright (C) 2007-2021 Free Software Foundation, Inc.
+
+;; Author: John Wiegley <johnw@gnu.org>
+
+;; 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/>.
+
+;;; 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.
+;;    If the key is not set, org-crypt will default to symmetric encryption.
+;;
+;; 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-/.
+;;
+;; 4. To automatically encrypt all necessary entries when saving a
+;;    file, call `org-crypt-use-before-save-magic' after loading
+;;    org-crypt.el.
+
+;;; Thanks:
+
+;; - Carsten Dominik
+;; - Vitaly Ostanin
+
+;;; Code:
+
+(require 'org-macs)
+(require 'org-compat)
+
+(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))
+(defvar epg-context)
+
+(declare-function org-back-over-empty-lines "org" ())
+(declare-function org-back-to-heading "org" (&optional invisible-ok))
+(declare-function org-before-first-heading-p "org" ())
+(declare-function org-end-of-meta-data "org" (&optional full))
+(declare-function org-end-of-subtree "org" (&optional invisible-ok to-heading))
+(declare-function org-entry-get "org" (pom property &optional inherit literal-nil))
+(declare-function org-flag-subtree "org" (flag))
+(declare-function org-make-tags-matcher "org" (match))
+(declare-function org-previous-visible-heading "org" (arg))
+(declare-function org-scan-tags "org" (action matcher todo-only &optional start-level))
+(declare-function org-set-property "org" (property value))
+
+(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 ""
+  "The default key to use when encrypting the contents of a heading.
+
+If this variable is nil, always use symmetric encryption, unconditionally.
+
+Otherwise, The string is matched against all keys in the key ring.
+In particular, the empty string matches no key.  If no key is found,
+look for the `epa-file-encrypt-to' local variable.  Ultimately fall back
+to symmetric encryption.
+
+This setting can be overridden in the CRYPTKEY property."
+  :group 'org-crypt
+  :type '(choice
+	  (string :tag "Public key(s) matching")
+	  (const :tag "Symmetric encryption" nil)))
+
+(defcustom org-crypt-disable-auto-save 'ask
+  "What org-decrypt should do if `auto-save-mode' is enabled.
+
+t        : Disable auto-save-mode for the current buffer
+           prior to decrypting an entry.
+
+nil      : Leave auto-save-mode enabled.
+           This may cause data to be written to disk unencrypted!
+
+`ask'    : Ask user whether or not to disable auto-save-mode
+           for the current buffer.
+
+`encrypt': Leave auto-save-mode enabled for the current buffer,
+           but automatically re-encrypt all decrypted entries
+           *before* auto-saving.
+           NOTE: This only works for entries which have a tag
+           that matches `org-crypt-tag-matcher'."
+  :group 'org-crypt
+  :version "24.1"
+  :type '(choice (const :tag "Always"  t)
+                 (const :tag "Never"   nil)
+                 (const :tag "Ask"     ask)
+                 (const :tag "Encrypt" encrypt)))
+
+(defun org-crypt--encrypted-text (beg end)
+  "Return encrypted text in between BEG and END."
+  ;; Ignore indentation.
+  (replace-regexp-in-string
+   "^[ \t]*" ""
+   (buffer-substring-no-properties beg end)))
+
+(defun org-at-encrypted-entry-p ()
+  "Is the current entry encrypted?
+When the entry is encrypted, return a pair (BEG . END) where BEG
+and END are buffer positions delimiting the encrypted area."
+  (org-with-wide-buffer
+   (unless (org-before-first-heading-p)
+     (org-back-to-heading t)
+     (org-end-of-meta-data 'standard)
+     (let ((case-fold-search nil)
+	   (banner-start (rx (seq bol
+				  (zero-or-more (any "\t "))
+				  "-----BEGIN PGP MESSAGE-----"
+				  eol))))
+       (when (looking-at banner-start)
+	 (let ((start (point))
+	       (banner-end (rx (seq bol
+				    (or (group (zero-or-more (any "\t "))
+					       "-----END PGP MESSAGE-----"
+					       eol)
+					(seq (one-or-more "*") " "))))))
+	   (when (and (re-search-forward banner-end nil t) (match-string 1))
+	     (cons start (line-beginning-position 2)))))))))
+
+(defun org-crypt-check-auto-save ()
+  "Check whether auto-save-mode is enabled for the current buffer.
+
+`auto-save-mode' may cause leakage when decrypting entries, so
+check whether it's enabled, and decide what to do about it.
+
+See `org-crypt-disable-auto-save'."
+  (when buffer-auto-save-file-name
+    (cond
+     ((or
+       (eq org-crypt-disable-auto-save t)
+       (and
+	(eq org-crypt-disable-auto-save 'ask)
+	(y-or-n-p "org-decrypt: auto-save-mode may cause leakage.  Disable it for current buffer? ")))
+      (message "org-decrypt: Disabling auto-save-mode for %s"
+               (or (buffer-file-name) (current-buffer)))
+      ;; The argument to auto-save-mode has to be "-1", since
+      ;; giving a "nil" argument toggles instead of disabling.
+      (auto-save-mode -1))
+     ((eq org-crypt-disable-auto-save nil)
+      (message "org-decrypt: Decrypting entry with auto-save-mode enabled.  This may cause leakage."))
+     ((eq org-crypt-disable-auto-save 'encrypt)
+      (message "org-decrypt: Enabling re-encryption on auto-save.")
+      (add-hook 'auto-save-hook
+		(lambda ()
+		  (message "org-crypt: Re-encrypting all decrypted entries due to auto-save.")
+		  (org-encrypt-entries))
+		nil t))
+     (t nil))))
+
+(defun org-crypt-key-for-heading ()
+  "Return the encryption key(s) for the current heading.
+Assume `epg-context' is set."
+  (and org-crypt-key
+       (or (epg-list-keys epg-context
+			  (or (org-entry-get nil "CRYPTKEY" 'selective)
+			      org-crypt-key))
+	   (bound-and-true-p epa-file-encrypt-to)
+	   (progn
+	     (message "No crypt key set, using symmetric encryption.")
+	     nil))))
+
+;;;###autoload
+(defun org-encrypt-entry ()
+  "Encrypt the content of the current headline."
+  (interactive)
+  (unless (org-at-encrypted-entry-p)
+    (require 'epg)
+    (setq-local epg-context (epg-make-context nil t t))
+    (org-with-wide-buffer
+     (org-back-to-heading t)
+     (let ((start-heading (point))
+	   (crypt-key (org-crypt-key-for-heading))
+	   (folded? (org-invisible-p (line-beginning-position))))
+       (org-end-of-meta-data 'standard)
+       (let ((beg (point))
+	     (folded-heading
+	      (and folded?
+		   (save-excursion
+		     (org-previous-visible-heading 1)
+		     (point)))))
+	 (goto-char start-heading)
+	 (org-end-of-subtree t t)
+	 (org-back-over-empty-lines)
+	 (let* ((contents (delete-and-extract-region beg (point)))
+		(key (get-text-property 0 'org-crypt-key contents))
+		(checksum (get-text-property 0 'org-crypt-checksum contents)))
+	   (condition-case err
+	       (insert
+		;; Text and key have to be identical, otherwise we
+		;; re-crypt.
+		(if (and (equal crypt-key key)
+			 (string= checksum (sha1 contents)))
+		    (get-text-property 0 'org-crypt-text contents)
+		  (epg-encrypt-string epg-context contents crypt-key)))
+	     ;; If encryption failed, make sure to insert back entry
+	     ;; contents in the buffer.
+	     (error
+	      (insert contents)
+	      (error (error-message-string err)))))
+	 (when folded-heading
+	   (goto-char folded-heading)
+	   (org-flag-subtree t))
+	 nil)))))
+
+;;;###autoload
+(defun org-decrypt-entry ()
+  "Decrypt the content of the current headline."
+  (interactive)
+  (pcase (org-at-encrypted-entry-p)
+    (`(,beg . ,end)
+     (require 'epg)
+     (setq-local epg-context (epg-make-context nil t t))
+     (org-with-point-at beg
+       (org-crypt-check-auto-save)
+       (let* ((folded-heading
+	       (and (org-invisible-p)
+		    (save-excursion
+		      (org-previous-visible-heading 1)
+		      (point))))
+	      (encrypted-text (org-crypt--encrypted-text beg end))
+	      (decrypted-text
+	       (decode-coding-string
+		(epg-decrypt-string epg-context encrypted-text)
+		'utf-8)))
+	 ;; Delete region starting just before point, because the
+	 ;; outline property starts at the \n of the heading.
+	 (delete-region (1- (point)) end)
+	 ;; Store a checksum of the decrypted and the encrypted text
+	 ;; value.  This allows reusing the same encrypted text if the
+	 ;; text does not change, and therefore avoid a re-encryption
+	 ;; process.
+	 (insert "\n"
+		 (propertize decrypted-text
+			     'org-crypt-checksum (sha1 decrypted-text)
+			     'org-crypt-key (org-crypt-key-for-heading)
+			     'org-crypt-text encrypted-text))
+	 (when folded-heading
+	   (goto-char folded-heading)
+	   (org-flag-subtree t))
+	 nil)))
+    (_ nil)))
+
+(defvar org--matcher-tags-todo-only)
+
+;;;###autoload
+(defun org-encrypt-entries ()
+  "Encrypt all top-level entries in the current buffer."
+  (interactive)
+  (let ((org--matcher-tags-todo-only nil))
+    (org-scan-tags
+     'org-encrypt-entry
+     (cdr (org-make-tags-matcher org-crypt-tag-matcher))
+     org--matcher-tags-todo-only)))
+
+;;;###autoload
+(defun org-decrypt-entries ()
+  "Decrypt all entries in the current buffer."
+  (interactive)
+  (let ((org--matcher-tags-todo-only nil))
+    (org-scan-tags
+     'org-decrypt-entry
+     (cdr (org-make-tags-matcher org-crypt-tag-matcher))
+     org--matcher-tags-todo-only)))
+
+;;;###autoload
+(defun org-crypt-use-before-save-magic ()
+  "Add a hook to 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))))
+
+(add-hook 'org-reveal-start-hook 'org-decrypt-entry)
+
+(provide 'org-crypt)
+
+;;; org-crypt.el ends here