From: Jeremey Barrett <jeremey@veriweb.com>
Date: Sat, 25 Jan 1997 07:55:47 -0800 (PST)
To: cypherpunks@toad.com
Subject: Mailcrypt nym.alias.net support
Message-ID: <199701251555.HAA28063@toad.com>
MIME-Version: 1.0
Content-Type: text/plain


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For those of you who use mailcrypt (Emacs-PGP interface) for email, I
have hacked in support for pseudonyms ala nym.alias.net. In fact,
the code has nym.alias.net hardcoded for now. I'm gonna add more stuff,
but I'm just letting this out as is.

This patch affects mailcrypt.el and mc-remail.el. I made these changes
to mailcrypt 3.4, so your mileage may vary on other versions. I did
this after the C2 party tonight, so typos and bugs are possible. Please
email me if bugs are found. "This value is not configureable" does not
qualify, I know it's not configureable yet.

(BTW there are a couple functions not used, I was doing it one way, then
changed my way of thinking, but the code is ok so I left it.)


Installing it:

 o cd to your lisp directory

 o cat /path/to/the/patch | patch -p0, or something similar
   (You will need to pgp this message before extracting the patch
    to get rid of the leading "- " on some lines.)

 o recompile the .el files, ala:

   emacs -batch -f batch-byte-compile mc-remail.el
   emacs -batch -f batch-byte-compile mailcrypt.el


Using it:

 o You _must_ have a remailer chain defined. This does not work
   with a single remailer (though a chain of length 1 might work).

 o Compose a message or reply as normal. Once you are done (the message
   would go out without nyms or remailers or anything if you hit
   C-c C-c), hit C-c / n.

 o The first question asks for a remailer chain, it will do completions.

 o The second question asks for the name of your nym. This is assumed
   to be @nym.alias.net, DO NOT include @nym.alias.net. If your nym
   is jimbob@nym.alias.net, just answer jimbob. This does not do 
   completions at the moment. Putting your nym in your .emacs file
   is a bit weird anyway.

 o You will be asked for a signature for your nym's private key.

 o The message will be rewritten to send@nym.alias.net and then
   to the remailer chain you chose.

 o Send it.


Hack the code at will, if you make significant enhancements, please
email patches to me. Of course there is no warranty of any sort, if
it blows up your machine you're out a machine.


I will put this on my web page (http://www.veriweb.com/people/jeremey)
for those that prefer that.

Ok, here's the patch:

- ---------------------------------cut here-----------------------------------
*** mailcrypt.el	Tue Oct 10 12:33:45 1995
- --- /usr/home/jeremey/PGP/mailcrypt-3.4/mailcrypt.el	Sat Jan 25 02:45:27 1997
***************
*** 51,56 ****
- --- 51,57 ----
  (autoload 'mc-sign "mc-toplev" nil t)
  (autoload 'mc-insert-public-key "mc-toplev" nil t)
  (autoload 'mc-remailer-encrypt-for-chain "mc-remail" nil t)
+ (autoload 'mc-remailer-encrypt-for-nym "mc-remail" nil t)
  (autoload 'mc-remailer-insert-response-block "mc-remail" nil t)
  (autoload 'mc-remailer-insert-pseudonym "mc-remail" nil t)
  
***************
*** 101,107 ****
        (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))
- --- 102,110 ----
        (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)
!       (define-key mc-write-mode-map "\C-c/n"
! 	'mc-remailer-encrypt-for-nym)))
  
  (easy-menu-define
   mc-read-mode-menu (if mc-xemacs-p nil (list mc-read-mode-map))
*** mc-remail.el	Wed Oct  4 15:45:56 1995
- --- /usr/home/jeremey/PGP/mailcrypt-3.4/mc-remail.el	Sat Jan 25 02:44:16 1997
***************
*** 378,383 ****
- --- 378,401 ----
  	  (re-search-forward "^$" nil 'move)
  	  (cons (copy-marker start) (copy-marker (point)))))))
  
+ (defun mc-find-nym-from-header (name subject &optional insert)
+   ;; Find the header with a "::" immediately after the
+   ;; mail-header-separator.  Return region enclosing header.  Optional
+   ;; arg INSERT means insert the header if it does not exist already.
+   (save-excursion
+     (goto-char (point-min))
+     (re-search-forward
+      (concat "^" (regexp-quote mail-header-separator) "\n"))
+     (if (or (and (looking-at "From") (forward-line 1))
+ 	    (and insert
+ 		 (progn
+ 		   (insert-before-markers 
+ 		    (concat "From: " name "\nTo: \nSubject:" subject "\n\n"))
+ 		   (forward-line -1))))
+ 	(let ((start (point)))
+ 	  (re-search-forward "^$" nil 'move)
+ 	  (cons (copy-marker start) (copy-marker (point)))))))
+ 
  (defun mc-find-hash-header (&optional insert)
    (save-excursion
      (goto-char (point-min))
***************
*** 400,411 ****
- --- 418,442 ----
  (defsubst mc-replace-main-field (field replacement)
    (mc-replace-field field replacement (mc-find-main-header t)))
  
+ (defsubst mc-nuke-main-field (field)
+   (mc-nuke-field field (mc-find-main-header t)))
+ 
  (defsubst mc-replace-hash-field (field replacement)
    (mc-replace-field field replacement (mc-find-hash-header t)))
  
  (defsubst mc-replace-colon-field (field replacement)
    (mc-replace-field field replacement (mc-find-colon-header t)))
  
+ (defsubst mc-insert-nym-header (replacement)
+   (mc-find-nym-from-header replacement 
+ 			   (cdr (car (mc-get-fields "Subject" 
+ 						    (mc-find-main-header)))) t)
+   (mc-replace-main-field "To" "send@nym.alias.net")
+   (mc-nuke-main-field "Cc")
+   (mc-nuke-main-field "Organization")
+   (mc-nuke-main-field "Subject")
+   (mc-nuke-main-field "From"))
+ 
  (defun mc-recipient-is-remailerp ()
    (let ((to (mc-get-fields "To" (mc-find-main-header))))
      (and to
***************
*** 516,521 ****
- --- 547,568 ----
  	(setq pseudonym (concat pseudonym " <x@x.x>")))
      (mc-replace-colon-field "From" pseudonym)))
  
+ (defun mc-remailer-insert-nym-nym ()
+   "Insert pseudonym as a From field in the hash-mark header.
+ 
+ See the documentation for the variable `mc-remailer-pseudonyms' for
+ more information."
+   (interactive)
+   (let ((completion-ignore-case t)
+ 	pseudonym)
+     (setq pseudonym
+ 	  (cond ((null mc-remailer-pseudonyms)
+ 		 (read-from-minibuffer "Pseudonym: "))
+ 		(t
+ 		 (completing-read "Pseudonym: "
+ 				  (mapcar 'list mc-remailer-pseudonyms)))))
+     (mc-insert-nym-header pseudonym)))
+ 
  ;;}}}
  ;;{{{ Mixmaster support
  (defvar mc-mixmaster-path nil
***************
*** 730,735 ****
- --- 777,826 ----
        (error "Unable to encrypt message to %s"
  	     (mc-remailer-userid remailer)))))
  
+ (defun mc-rewrite-for-nym-internal (nym &optional pause)
+   ;; Rewrite the current mail buffer for nym.alias.net.  This
+   ;; includes pulling down the To: and Subject: headers, changing
+   ;; the To: header, and encrypting to send@nym.alias.net and signing 
+   ;; with the nym's key. This should be used only as part of
+   ;; mc-rewrite-for-nym since it will subsequently chain the message
+   ;; through a set of remailers.
+   (let ((addr "send@nym.alias.net")
+ 	(main-header (mc-find-main-header)))
+ 
+     ;; Move "Subject" lines down.
+     (goto-char (cdr main-header))
+     (forward-line 1)
+     (mapcar
+      (function (lambda (f) (insert (car f) ":" (cdr f))))
+      (mc-get-fields "Subject" main-header t))
+     (insert "\n")
+ 
+     ;; Move "To" lines down.
+     (goto-char (cdr main-header))
+     (forward-line 1)
+     (mapcar
+      (function (lambda (f) (insert (car f) ":" (cdr f))))
+      (mc-get-fields "To" main-header t))
+ 
+     ;; Insert "From" for nym.alias.net
+     (goto-char (cdr main-header))
+     (forward-line 1)
+     (insert (concat "From: " nym "\n"))
+ 
+     (goto-char (car main-header))
+     (insert "To: send@nym.alias.net\n")
+ 
+     (if pause
+ 	(let ((cursor-in-echo-area t))
+ 	  (message "SPC to encrypt for %s : " addr)
+ 	  (read-char-exclusive)))
+     (setq main-header (mc-find-main-header))
+     (goto-char (cdr main-header))
+     (forward-line 1)
+     (let ((mc-encrypt-for-me nil))
+       (mc-encrypt-message "send@nym.alias.net" nil (point) nil 
+ 			  (concat nym "@nym.alias.net") t))))
+ 
  (defun mc-rewrite-for-chain (chain &optional pause)
    ;; Rewrite the current buffer for a chain of remailers.
    ;; CHAIN must be in canonical form.
***************
*** 744,749 ****
- --- 835,856 ----
  	  (mc-rewrite-for-remailer (car chain) pause)
  	(mc-rewrite-for-mixmaster chain pause)))))
  
+ (defun mc-rewrite-for-nym (nym chain &optional pause)
+   ;; Rewrite the current buffer for nym.alias.net through a
+   ;; chain of remailers. CHAIN must be in canonical form.
+   ;; nym is assumed to be the nym's name WITHOUT @nym.alias.net on it.
+   (let (rest)
+     (if mc-mixmaster-path
+ 	(setq rest (mc-mixmaster-skip chain))
+       (setq rest chain))
+     (if (null chain) nil
+       (mc-rewrite-for-nym-internal nym pause)
+       (mc-rewrite-for-chain
+        (if (eq rest chain) (cdr rest) rest) pause)
+       (if (eq rest chain)
+ 	  (mc-rewrite-for-remailer (car chain) pause)
+ 	(mc-rewrite-for-mixmaster chain pause)))))
+ 
  (defun mc-unparse-chain (chain)
    ;; Unparse CHAIN into a string suitable for printing.
    (if (null chain)
***************
*** 782,787 ****
- --- 889,926 ----
  	   (cdr (assoc chain-name chains))
  	   chains))
      (mc-rewrite-for-chain chain pause)
+     (if chain
+ 	(save-excursion
+ 	  (set-buffer buffer)
+ 	  (erase-buffer)
+ 	  (insert "Rewritten for chain `" chain-name "':\n\n"
+ 		  (mc-unparse-chain chain))
+ 	  (message "Done.  See %s buffer for details." mc-buffer-name)))))
+ 
+ ;;}}}
+ 
+ (defun mc-remailer-encrypt-for-nym (&optional pause)
+   "Encrypt message for a nym server, to be resent, prompting for chain to use.
+ 
+ With \\[universal-argument], pause before each encryption."
+   (interactive "P")
+   (let ((chains (mc-remailer-make-chains-alist))
+ 	(buffer (get-buffer-create mc-buffer-name))
+ 	chain-name chain nym)
+     (mc-nuke-field "CC")
+     (mc-nuke-field "Organization")
+     (mc-disallow-field "FCC")
+     (mc-disallow-field "BCC")
+     (setq chain-name
+ 	  (completing-read
+ 	   "Choose a remailer or chain: " chains nil 'strict-match))
+     (setq nym
+ 	  (read-from-minibuffer "Pseudonym: "))
+     (setq chain
+ 	  (mc-remailer-canonicalize-chain
+ 	   (cdr (assoc chain-name chains))
+ 	   chains))
+     (mc-rewrite-for-nym nym chain pause)
      (if chain
  	(save-excursion
  	  (set-buffer buffer)
- ---------------------------------cut here-----------------------------------

- -- 
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Jeremey Barrett
Senior Software Engineer                         jeremey@veriweb.com
VeriWeb Internet Corp.                           http://www.veriweb.com/

PGP Key fingerprint =  3B 42 1E D4 4B 17 0D 80  DC 59 6F 59 04 C3 83 64
PGP Public Key: http://www.veriweb.com/people/jeremey/pgpkey.txt
                
		"less is more."  -- Mies van de Rohe.
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=


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