+++ /dev/null
-;;; rfc2104.el --- RFC2104 Hashed Message Authentication Codes
-;; Copyright (C) 1998, 1999, 2000 Free Software Foundation, Inc.
-
-;; Author: Simon Josefsson <jas@pdc.kth.se>
-;; 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
-
-;;; 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-bitstring (str)
- (let (out)
- (while (< 0 (length str))
- (push (rfc2104-hex-to-int (substring str -2)) out)
- (setq str (substring str 0 -2)))
- (concat 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 (concat k_opad (rfc2104-hexstring-to-bitstring
- ;; perform inner hash
- (funcall hash (concat k_ipad text)))))))
-
-(provide 'rfc2104)
-
-;;; rfc2104.el ends here
projects / elisp / gnus.git- / blobdiff