[Emacs-diffs] Changes to emacs/lisp/gnus/rfc2104.el [emacs-unicode-2]

[Kenichi Handa]

Index: emacs/lisp/gnus/rfc2104.el
diff -c /dev/null emacs/lisp/gnus/rfc2104.el:1.4.6.1
*** /dev/null   Thu Nov 13 03:49:29 2003
--- emacs/lisp/gnus/rfc2104.el  Thu Nov 13 03:49:29 2003
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*** 0 ****
--- 1,121 ----
+ ;;; rfc2104.el --- RFC2104 Hashed Message Authentication Codes
+ ;; Copyright (C) 1998, 1999, 2000 Free Software Foundation, Inc.
+ 
+ ;; Author: Simon Josefsson <address@hidden>
+ ;; Keywords: mail
+ 
+ ;; 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 2, 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., 59 Temple Place - Suite 330,
+ ;; Boston, MA 02111-1307, USA.
+ 
+ ;;; Commentary:
+ 
+ ;;; This is a quick'n'dirty, low performance, implementation of RFC2104.
+ ;;;
+ ;;; Example:
+ ;;;
+ ;;; (require 'md5)
+ ;;; (rfc2104-hash 'md5 64 16 "Jefe" "what do ya want for nothing?")
+ ;;; "750c783e6ab0b503eaa86e310a5db738"
+ ;;;
+ ;;; (require 'sha-1)
+ ;;; (rfc2104-hash 'sha1-encode 64 20 "Jefe" "what do ya want for nothing?")
+ ;;; "effcdf6ae5eb2fa2d27416d5f184df9c259a7c79"
+ ;;;
+ ;;; 64 is block length of hash function (64 for MD5 and SHA), 16 is
+ ;;; resulting hash length (16 for MD5, 20 for SHA).
+ ;;;
+ ;;; Tested with Emacs 20.2 and XEmacs 20.3.
+ ;;;
+ ;;; Test case reference: RFC 2202.
+ 
+ ;;; Release history:
+ ;;;
+ ;;; 1998-08-16  initial release posted to gnu.emacs.sources
+ ;;; 1998-08-17  use append instead of char-list-to-string
+ ;;; 1998-08-26  don't require hexl
+ ;;; 1998-09-25  renamed from hmac.el to rfc2104.el, also renamed functions
+ ;;; 1999-10-23  included in pgnus
+ ;;; 2000-08-15  `rfc2104-hexstring-to-bitstring'
+ ;;; 2000-05-12  added sha-1 example, added test case reference
+ ;;; 2003-11-13  change rfc2104-hexstring-to-bitstring to ...-byte-list
+ 
+ ;;; Code:
+ 
+ (eval-when-compile (require 'cl))
+ 
+ ;; Magic character for inner HMAC round. 0x36 == 54 == '6'
+ (defconst rfc2104-ipad ?\x36)
+ 
+ ;; Magic character for outer HMAC round. 0x5C == 92 == '\'
+ (defconst rfc2104-opad ?\x5C)
+ 
+ ;; Not so magic character for padding the key. 0x00
+ (defconst rfc2104-zero ?\x00)
+ 
+ ;; Alist for converting hex to decimal.
+ (defconst rfc2104-hex-alist
+   '((?0 . 0)        (?a . 10)       (?A . 10)
+     (?1 . 1)        (?b . 11)       (?B . 11)
+     (?2 . 2)        (?c . 12)       (?C . 12)
+     (?3 . 3)        (?d . 13)       (?D . 13)
+     (?4 . 4)        (?e . 14)       (?E . 14)
+     (?5 . 5)        (?f . 15)       (?F . 15)
+     (?6 . 6)
+     (?7 . 7)
+     (?8 . 8)
+     (?9 . 9)))
+ 
+ (defun rfc2104-hex-to-int (str)
+   (if str
+       (if (listp str)
+         (+ (* 16 (rfc2104-hex-to-int (cdr str)))
+            (cdr (assoc (car str) rfc2104-hex-alist)))
+       (rfc2104-hex-to-int (reverse (append str nil))))
+     0))
+ 
+ (defun rfc2104-hexstring-to-byte-list (str)
+   (let (out)
+     (while (< 0 (length str))
+       (push (rfc2104-hex-to-int (substring str -2)) out)
+       (setq str (substring str 0 -2)))
+     out))
+ 
+ (defun rfc2104-hash (hash block-length hash-length key text)
+   (let* (;; if key is longer than B, reset it to HASH(key)
+        (key (if (> (length key) block-length)
+                 (funcall hash key) key))
+        (k_ipad (append key nil))
+        (k_opad (append key nil)))
+     ;; zero pad k_ipad/k_opad
+     (while (< (length k_ipad) block-length)
+       (setq k_ipad (append k_ipad (list rfc2104-zero))))
+     (while (< (length k_opad) block-length)
+       (setq k_opad (append k_opad (list rfc2104-zero))))
+     ;; XOR key with ipad/opad into k_ipad/k_opad
+     (setq k_ipad (mapcar (lambda (c) (logxor c rfc2104-ipad)) k_ipad))
+     (setq k_opad (mapcar (lambda (c) (logxor c rfc2104-opad)) k_opad))
+     ;; perform outer hash
+     (funcall hash
+            (encode-coding-string
+             (concat k_opad (rfc2104-hexstring-to-byte-list
+                             ;; perform inner hash
+                             (funcall hash (concat k_ipad text))))
+             'iso-latin-1))))
+ 
+ (provide 'rfc2104)
+ 
+ ;;; rfc2104.el ends here