/usr/share/emacs/site-lisp/mailcrypt/mailcrypt.el is in mailcrypt 3.5.9-7.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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;; Copyright (C) 1995 Jin Choi <jin@atype.com>
;; Patrick LoPresti <patl@lcs.mit.edu>
;; (C) 1998 Len Budney <lbudney@pobox.com>
;; (C) 2001 Brian Warner <warner@lothar.com>
;; Any comments or suggestions welcome.
;; Inspired by pgp.el, by Gray Watson <gray@antaire.com>.
;;{{{ Licensing
;; This file is intended to be used with GNU Emacs.
;; This program 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 2, or (at your option)
;; any later version.
;; This program 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, 675 Mass Ave, Cambridge, MA 02139, USA.
;;}}}
;;{{{ Load some required packages
(eval-when-compile
;; Quiet warnings
(autoload 'start-itimer "itimer")
(autoload 'cancel-itimer "itimer")
(autoload 'delete-itimer "itimer"))
(require 'easymenu)
(require 'comint)
(require 'rfc822)
(eval-and-compile
(condition-case nil (require 'itimer) (error nil))
(if (not (featurep 'itimer))
(condition-case nil (require 'timer) (error nil)))
(if (not (fboundp 'buffer-substring-no-properties))
(fset 'buffer-substring-no-properties 'buffer-substring)))
(defconst mc-xemacs-p (string-match "XEmacs" emacs-version))
(autoload 'mc-decrypt "mc-toplev" nil t)
(autoload 'mc-verify "mc-toplev" nil t)
(autoload 'mc-snarf "mc-toplev" nil t)
(autoload 'mc-fetch-key "mc-toplev" nil t)
(autoload 'mc-encrypt "mc-toplev" nil t)
(autoload 'mc-sign "mc-toplev" nil t)
(autoload 'mc-insert-public-key "mc-toplev" nil t)
(autoload 'mc-remail "mc-toplev" nil t)
(autoload 'mc-remailer-encrypt-for-chain "mc-remail" nil t)
(autoload 'mc-remailer-insert-response-block "mc-remail" nil t)
(autoload 'mc-remailer-insert-pseudonym "mc-remail" nil t)
(autoload 'mc-setversion "mc-setversion" nil t)
;;}}}
;;{{{ Minor mode variables and functions
(defvar mc-pgp-always-sign nil
"*If t, always sign encrypted PGP messages, or never sign if 'never.")
(defvar mc-read-mode nil
"Non-nil means Mailcrypt read mode key bindings are available.")
(defvar mc-write-mode nil
"Non-nil means Mailcrypt write mode key bindings are available.")
(make-variable-buffer-local 'mc-read-mode)
(make-variable-buffer-local 'mc-write-mode)
(defvar mc-read-mode-string " MC-r"
"*String to put in mode line when Mailcrypt read mode is active.")
(defvar mc-write-mode-string " MC-w"
"*String to put in mode line when Mailcrypt write mode is active.")
(defvar mc-read-mode-map nil
"Keymap for Mailcrypt read mode bindings.")
(defvar mc-write-mode-map nil
"Keymap for Mailcrypt write mode bindings.")
(or mc-read-mode-map
(progn
(setq mc-read-mode-map (make-sparse-keymap))
(define-key mc-read-mode-map "\C-c/f" 'mc-deactivate-passwd)
(define-key mc-read-mode-map "\C-c/d" 'mc-decrypt)
(define-key mc-read-mode-map "\C-c/v" 'mc-verify)
(define-key mc-read-mode-map "\C-c/a" 'mc-snarf)
(define-key mc-read-mode-map "\C-c/k" 'mc-fetch-key)))
(or mc-write-mode-map
(progn
(setq mc-write-mode-map (make-sparse-keymap))
(define-key mc-write-mode-map "\C-c/f" 'mc-deactivate-passwd)
(define-key mc-write-mode-map "\C-c/e" 'mc-encrypt)
(define-key mc-write-mode-map "\C-c/s" 'mc-sign)
(define-key mc-write-mode-map "\C-c/x" 'mc-insert-public-key)
(define-key mc-write-mode-map "\C-c/k" 'mc-fetch-key)
(define-key mc-write-mode-map "\C-c/r" 'mc-remail)
(define-key mc-write-mode-map "\C-c/b"
'mc-remailer-insert-response-block)
(define-key mc-write-mode-map "\C-c/p"
'mc-remailer-insert-pseudonym)))
(easy-menu-define
mc-read-mode-menu (if mc-xemacs-p nil (list mc-read-mode-map))
"Mailcrypt read mode menu."
'("Mailcrypt"
["Decrypt Message" mc-decrypt t]
["Verify Signature" mc-verify t]
["Snarf Keys" mc-snarf t]
["Fetch Key" mc-fetch-key t]
["Forget Passphrase(s)" mc-deactivate-passwd t]))
(easy-menu-define
mc-write-mode-menu (if mc-xemacs-p nil (list mc-write-mode-map))
"Mailcrypt write mode menu."
'("Mailcrypt"
["Encrypt Message" mc-encrypt t]
["Sign Message" mc-sign t]
["Insert Public Key" mc-insert-public-key t]
["Fetch Key" mc-fetch-key t]
["Encrypt for Remailer(s)" mc-remail t]
["Insert Pseudonym" mc-remailer-insert-pseudonym t]
["Insert Response Block" mc-remailer-insert-response-block t]
["Forget Passphrase(s)" mc-deactivate-passwd t]))
(or (assq 'mc-read-mode minor-mode-map-alist)
(setq minor-mode-map-alist
(cons (cons 'mc-read-mode mc-read-mode-map)
minor-mode-map-alist)))
(or (assq 'mc-write-mode minor-mode-map-alist)
(setq minor-mode-map-alist
(cons (cons 'mc-write-mode mc-write-mode-map)
minor-mode-map-alist)))
(or (assq 'mc-read-mode minor-mode-alist)
(setq minor-mode-alist
(cons '(mc-read-mode mc-read-mode-string) minor-mode-alist)))
(or (assq 'mc-write-mode minor-mode-alist)
(setq minor-mode-alist
(cons '(mc-write-mode mc-write-mode-string) minor-mode-alist)))
;;;###autoload
(defun mc-read-mode (&optional arg)
"\nMinor mode for interfacing with cryptographic functions.
\\<mc-read-mode-map>
\\[mc-decrypt]\t\tDecrypt an encrypted message
\\[mc-verify]\t\tVerify signature on a clearsigned message
\\[mc-snarf]\t\tAdd public key(s) to keyring
\\[mc-fetch-key]\t\tFetch a PGP key via finger or HTTP
\\[mc-deactivate-passwd]\t\tForget passphrase(s)\n"
(interactive)
(setq mc-read-mode
(if (null arg) (not mc-read-mode)
(> (prefix-numeric-value arg) 0)))
(and mc-read-mode mc-write-mode (mc-write-mode nil))
(if mc-read-mode
(easy-menu-add mc-read-mode-menu)
(easy-menu-remove mc-read-mode-menu)))
(defun mc-write-mode (&optional arg)
"\nMinor mode for interfacing with cryptographic functions.
\\<mc-write-mode-map>
\\[mc-encrypt]\t\tEncrypt (and optionally sign) message
\\[mc-sign]\t\tClearsign message
\\[mc-insert-public-key]\t\tExtract public key from keyring and insert into message
\\[mc-fetch-key]\t\tFetch a PGP key via finger or HTTP
\\[mc-remail]\t\tEncrypt message for remailing
\\[mc-remailer-insert-pseudonym]\t\tInsert a pseudonym (for remailing)
\\[mc-remailer-insert-response-block]\t\tInsert a response block (for remailing)
\\[mc-deactivate-passwd]\t\tForget passphrase(s)\n"
(interactive)
(setq mc-write-mode
(if (null arg) (not mc-write-mode)
(> (prefix-numeric-value arg) 0)))
(and mc-write-mode mc-read-mode (mc-read-mode nil))
(if mc-write-mode
(easy-menu-add mc-write-mode-menu)
(easy-menu-remove mc-write-mode-menu)))
;;;###autoload
(defun mc-install-read-mode ()
(interactive)
(mc-read-mode 1))
;;;###autoload
(defun mc-install-write-mode ()
(interactive)
(mc-write-mode 1))
;;}}}
;;{{{ Note:
;; The funny triple braces you see are used by `folding-mode', a minor
;; mode by Jamie Lokier, available from the elisp archive.
;;}}}
;;{{{ User variables.
(defconst mc-version "3.5.9")
(defvar mc-temp-directory
(cond ((fboundp 'temp-directory) (temp-directory))
((boundp 'temporary-file-directory) temporary-file-directory)
("/tmp/"))
"*Default temp directory to be used by Mailcrypt.")
(defvar mc-default-scheme 'mc-scheme-pgp
"*Specifies the encryption scheme for Mailcrypt to use. Defaults
to pgp 2.6 for backward compatibility.")
(defvar mc-default-remailer-scheme 'mc-remailer-scheme-type1
"*Specifies the remailer scheme to use. Defaults to Type-1 for backward
compatibility.")
(defvar mc-passwd-timeout 60
"*Time to deactivate password in seconds after a use.
nil or 0 means deactivate immediately. If the only timer package available
is the 'timer' package, then this can be a string in timer format.")
(defvar mc-ripem-user-id (or (getenv "RIPEM_USER_NAME")
(user-full-name) "*Your RIPEM user ID."))
(defvar mc-always-replace nil
"*If t, decrypt mail messages in place without prompting.
If 'never, always use a viewer instead of replacing.")
(defvar mc-use-default-recipients nil "*Assume that the message should
be encoded for everyone listed in the To, Cc, and Bcc fields.")
(defvar mc-encrypt-for-me nil "*Encrypt all outgoing messages with
user's public key.")
(defvar mc-pre-signature-hook nil
"*List of hook functions to run immediately before signing.")
(defvar mc-post-signature-hook nil
"*List of hook functions to run immediately after signing.")
(defvar mc-pre-encryption-hook nil
"*List of hook functions to run immediately before encrypting.")
(defvar mc-post-encryption-hook nil
"*List of hook functions to run after encrypting.")
(defvar mc-pre-decryption-hook nil
"*List of hook functions to run immediately before decrypting.")
(defvar mc-post-decryption-hook nil
"*List of hook functions to run after decrypting.")
(defconst mc-buffer-name "*MailCrypt*"
"Name of temporary buffer for mailcrypt")
(defvar mc-modes-alist
'((rmail-mode (decrypt . mc-rmail-decrypt-message)
(verify . mc-rmail-verify-signature))
(rmail-summary-mode (decrypt . mc-rmail-summary-decrypt-message)
(verify . mc-rmail-summary-verify-signature)
(snarf . mc-rmail-summary-snarf-keys))
(mew-draft-mode (encrypt . mc-encrypt-message)
(remailer-encrypt . mc-remail-message)
(sign . mc-sign-message))
(mew-message-mode (decrypt . mc-mew-decrypt-message))
(mew-summary-mode (decrypt . mc-mew-summary-decrypt-message)
(verify . mc-mew-summary-verify-signature)
(snarf . mc-mew-summary-snarf-keys))
(vm-mode (decrypt . mc-vm-decrypt-message)
(verify . mc-vm-verify-signature)
(snarf . mc-vm-snarf-keys))
(vm-virtual-mode (decrypt . mc-vm-decrypt-message)
(verify . mc-vm-verify-signature)
(snarf . mc-vm-snarf-keys))
(vm-summary-mode (decrypt . mc-vm-decrypt-message)
(verify . mc-vm-verify-signature)
(snarf . mc-vm-snarf-keys))
(mh-folder-mode (decrypt . mc-mh-decrypt-message)
(verify . mc-mh-verify-signature)
(snarf . mc-mh-snarf-keys))
(message-mode (encrypt . mc-encrypt-message)
(remailer-encrypt . mc-remail-message)
(sign . mc-sign-message))
(gnus-summary-mode (decrypt . mc-gnus-decrypt-message)
(verify . mc-gnus-verify-signature)
(snarf . mc-gnus-snarf-keys))
(gnus-article-mode (decrypt . mc-gnus-decrypt-message)
(verify . mc-gnus-verify-signature)
(snarf . mc-gnus-snarf-keys))
(mail-mode (encrypt . mc-encrypt-message)
(remailer-encrypt . mc-remail-message)
(sign . mc-sign-message))
(vm-mail-mode (encrypt . mc-encrypt-message)
(remailer-encrypt . mc-remail-message)
(sign . mc-sign-message))
(mh-letter-mode (encrypt . mc-encrypt-message)
(remailer-encrypt . mc-remail-message)
(sign . mc-sign-message))
(news-reply-mode (encrypt . mc-encrypt-message)
(remailer-encrypt . mc-remail-message)
(sign . mc-sign-message))
;; wanderlust: http://www.gohome.org/wl/
;; or perhaps http://www.lab3.kuis.kyoto-u.ac.jp/~tsumura/emacs/wl.html
(wl-draft-mode (encrypt . mc-encrypt-message)
(remailer-encrypt . mc-remail-message)
(sign . mc-sign-message))
)
"Association list (indexed by major mode) of association lists
(indexed by operation) of functions to call for each major mode.")
;;}}}
;;{{{ Program variables and constants.
(defvar mc-timer nil "Timer object for password deactivation.")
(defvar mc-passwd-cache nil "Cache for passphrases.")
(defvar mc-schemes '(("pgp50" . mc-scheme-pgp50)
("pgp65" . mc-scheme-pgp65)
("pgp" . mc-scheme-pgp)
("gpg" . mc-scheme-gpg)
))
(defvar mc-remailer-schemes '(("type1" . mc-remailer-scheme-type1)
("mixmaster" . mc-remailer-scheme-mixmaster)
("mixminion" . mc-remailer-scheme-mixminion)
))
;;}}}
;;{{{ Utility functions.
(defun mc-message-delimiter-positions (start-re end-re &optional begin)
;; Returns pair of integers (START . END) that delimit message marked off
;; by the regular expressions start-re and end-re. Optional argument BEGIN
;; determines where we should start looking from.
(setq begin (or begin (point-min)))
(let (start)
(save-excursion
(goto-char begin)
(and (re-search-forward start-re nil t)
(setq start (match-beginning 0))
(re-search-forward end-re nil t)
(cons start (point))))))
(defun mc-split (regexp str)
"Splits STR into a list of elements which were separated by REGEXP,
stripping initial and trailing whitespace."
(let ((data (match-data))
(retval '())
beg end)
(unwind-protect
(progn
(string-match "[ \t\n]*" str) ; Will always match at 0
(setq beg (match-end 0))
(setq end (string-match "[ \t\n]*\\'" str))
(while (string-match regexp str beg)
(setq retval
(cons (substring str beg (match-beginning 0))
retval))
(setq beg (match-end 0)))
(if (not (= (length str) beg)) ; Not end
(setq retval (cons (substring str beg end) retval)))
(nreverse retval))
(store-match-data data))))
;;; FIXME - Function never called?
;(defun mc-temp-display (beg end &optional name)
; (let (tmp)
; (if (not name)
; (setq name mc-buffer-name))
; (if (string-match name "*ERROR*")
; (progn
; (message "mailcrypt: An error occured! See *ERROR* buffer.")
; (beep)))
; (setq tmp (buffer-substring beg end))
; (delete-region beg end)
; (save-excursion
; (save-window-excursion
; (with-output-to-temp-buffer name
; (princ tmp))))))
;; In case I ever decide to do this right.
;; LRB - Thanks Pat! This helped a lot in updating mixmaster support.
;; mc-field-name-regexp now catches precisely those email headers
;; which are RFC-822 compliant.
(defconst mc-field-name-regexp
(concat
"^\\(["
(char-to-string 33) "-" (char-to-string 57)
(char-to-string 59) "-" (char-to-string 126)
"]*\\)"))
(defconst mc-field-body-regexp "\\(.*\\(\n[ \t].*\\)*\n\\)")
(defun mc-get-fields (&optional matching bounds nuke)
"Get all header fields within BOUNDS. Return as an
alist ((FIELD-NAME . FIELD-BODY) (FIELD-NAME . FIELD-BODY) ...).
Argument MATCHING, if present, is a regexp which each FIELD-NAME
must match exactly. Matching is case-insensitive.
Optional arg NUKE, if non-nil, means eliminate all fields returned."
(save-excursion
(save-restriction
(let ((case-fold-search t)
(header-field-regexp
(concat mc-field-name-regexp ":" mc-field-body-regexp))
ret name body field-start field-end)
;; Ensure exact match
(if matching
(setq matching (concat "^\\(" matching "\\)$")))
(if bounds
(narrow-to-region (car bounds) (cdr bounds)))
(goto-char (point-max))
(while (re-search-backward header-field-regexp nil 'move)
(setq field-start (match-beginning 0))
(setq field-end (match-end 0))
(setq name (buffer-substring-no-properties
(match-beginning 1) (match-end 1)))
(setq body (buffer-substring-no-properties
(match-beginning 2) (match-end 2)))
(if (or (null matching) (string-match matching name))
(progn
(setq ret (cons (cons name body) ret))
(if nuke
(delete-region field-start field-end)))))
ret))))
(defsubst mc-strip-address (addr)
"Strip everything from ADDR except the basic Email address."
(car (rfc822-addresses addr)))
(defun mc-strip-addresses (addr-list)
"Strip everything from the addresses in ADDR-LIST except the basic
Email address. ADDR-LIST may be a single string or a list of strings."
(if (not (listp addr-list)) (setq addr-list (list addr-list)))
(setq addr-list
(mapcar
(function (lambda (s) (rfc822-addresses s)))
addr-list))
(setq addr-list (apply 'append addr-list))
(mapconcat 'mc-strip-address addr-list ", "))
(defun mc-display-buffer (buffer)
"Like display-buffer, but always display top of the buffer."
(save-excursion
(set-buffer buffer)
(goto-char (point-min))
(display-buffer buffer)))
(defun mc-message (msg &optional buffer default)
;; returns t if we used msg, nil if we used default
(let ((retval t))
(if buffer
(setq msg
(save-excursion
(set-buffer buffer)
(goto-char (point-min))
(if (re-search-forward msg nil t)
(buffer-substring-no-properties
(match-beginning 0) (match-end 0))
(setq retval nil)
default))))
(if msg (message-or-box "%s" msg))
retval))
(defun mc-message-sigstatus (msg &optional attention)
"Emit a signature status line. If ATTENTION is non-nil, be noisy about it."
;; this function exists to be overridden by the unit tests
(if attention (ding))
(message-or-box "%s" msg)
)
(defun mc-process-region (beg end passwd program args parser &optional buffer)
(let ((obuf (current-buffer))
(process-connection-type nil)
mybuf result rgn proc)
(unwind-protect
(progn
(setq mybuf (or buffer (generate-new-buffer " *mailcrypt temp")))
(set-buffer mybuf)
(erase-buffer)
(set-buffer obuf)
(buffer-disable-undo mybuf)
(setq proc
(apply 'start-process "*PGP*" mybuf program args))
(if passwd
(progn
(process-send-string proc (concat passwd "\n"))
(or mc-passwd-timeout (mc-deactivate-passwd t))))
(process-send-region proc beg end)
(process-send-eof proc)
(while (eq 'run (process-status proc))
(accept-process-output proc 5))
(setq result (process-exit-status proc))
;; Hack to force a status_notify() in Emacs 19.29
(delete-process proc)
(set-buffer mybuf)
(goto-char (point-max))
(if (re-search-backward "\nProcess \\*PGP.*\n\\'" nil t)
(delete-region (match-beginning 0) (match-end 0)))
(goto-char (point-min))
;; CRNL -> NL
(while (search-forward "\r\n" nil t)
(replace-match "\n"))
;; Hurm. FIXME; must get better result codes.
(if (stringp result)
(error "%s exited abnormally: '%s'" program result)
(setq rgn (funcall parser result))
;; If the parser found something, migrate it
(if (consp rgn)
(progn
(set-buffer obuf)
(delete-region beg end)
(goto-char beg)
(insert-buffer-substring mybuf (car rgn) (cdr rgn))
(set-buffer mybuf)
(delete-region (car rgn) (cdr rgn)))))
;; Return nil on failure and exit code on success
(if rgn result))
;; Cleanup even on nonlocal exit
(if (and proc (eq 'run (process-status proc)))
(interrupt-process proc))
(set-buffer obuf)
(or buffer (null mybuf) (kill-buffer mybuf)))))
;;}}}
;;{{{ Passphrase management
(defun mc-activate-passwd (id &optional prompt)
"Activate the passphrase matching ID, using PROMPT for a prompt.
Return the passphrase. If PROMPT is nil, only return value if cached."
(cond ((featurep 'itimer)
(if mc-timer (delete-itimer mc-timer))
(setq mc-timer (if mc-passwd-timeout
(start-itimer "mc-itimer"
'mc-deactivate-passwd
mc-passwd-timeout)
nil)))
((featurep 'timer)
(let ((string-time (if (integerp mc-passwd-timeout)
(format "%d sec" mc-passwd-timeout)
mc-passwd-timeout)))
(if mc-timer (cancel-timer mc-timer))
(setq mc-timer (if string-time
(run-at-time string-time
nil 'mc-deactivate-passwd)
nil)))))
(let ((cell (assoc id mc-passwd-cache))
passwd)
(setq passwd (cdr-safe cell))
(if (and (not passwd) prompt)
(setq passwd (comint-read-noecho prompt)))
(if cell
(setcdr cell passwd)
(setq mc-passwd-cache (cons (cons id passwd) mc-passwd-cache)))
passwd))
;;;###autoload
(defun mc-deactivate-passwd (&optional inhibit-message)
"*Deactivate the passphrase cache."
(interactive)
(if mc-timer
(cond ((featurep 'itimer) (delete-itimer mc-timer))
((featurep 'timer) (cancel-timer mc-timer))))
(mapcar
(function
(lambda (cell)
(if (stringp (cdr-safe cell)) (fillarray (cdr cell) 0))
(setcdr cell nil)))
mc-passwd-cache)
(or inhibit-message
(not (interactive-p))
(message "Passphrase%s deactivated"
(if (> (length mc-passwd-cache) 1) "s" ""))))
;;}}}
;;{{{ Define several aliases so that an apropos on `mailcrypt' will
;; return something.
(defalias 'mailcrypt-encrypt 'mc-encrypt)
(defalias 'mailcrypt-decrypt 'mc-decrypt)
(defalias 'mailcrypt-sign 'mc-sign)
(defalias 'mailcrypt-verify 'mc-verify)
(defalias 'mailcrypt-insert-public-key 'mc-insert-public-key)
(defalias 'mailcrypt-snarf 'mc-snarf)
;;}}}
(provide 'mailcrypt)
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