lisp/net/hmac-md5.el

   1 ;;; hmac-md5.el --- Compute HMAC-MD5.
   2
   3 ;; Copyright (C) 1999, 2001, 2007-2012  Free Software Foundation, Inc.
   4
   5 ;; Author: Shuhei KOBAYASHI <shuhei@aqua.ocn.ne.jp>
   6 ;; Keywords: HMAC, RFC2104, HMAC-MD5, MD5, KEYED-MD5, CRAM-MD5
   7
   8 ;; This file is part of GNU Emacs.
   9
  10 ;; GNU Emacs is free software: you can redistribute it and/or modify
  11 ;; it under the terms of the GNU General Public License as published by
  12 ;; the Free Software Foundation, either version 3 of the License, or
  13 ;; (at your option) any later version.
  14
  15 ;; GNU Emacs is distributed in the hope that it will be useful,
  16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 ;; GNU General Public License for more details.
  19
  20 ;; You should have received a copy of the GNU General Public License
  21 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  22
  23 ;;; Commentary:
  24
  25 ;; Test cases from RFC 2202, "Test Cases for HMAC-MD5 and HMAC-SHA-1".
  26 ;;
  27 ;; (encode-hex-string (hmac-md5 "Hi There" (make-string 16 ?\x0b)))
  28 ;;  => "9294727a3638bb1c13f48ef8158bfc9d"
  29 ;;
  30 ;; (encode-hex-string (hmac-md5 "what do ya want for nothing?" "Jefe"))
  31 ;;  => "750c783e6ab0b503eaa86e310a5db738"
  32 ;;
  33 ;; (encode-hex-string (hmac-md5 (make-string 50 ?\xdd) (make-string 16 ?\xaa)))
  34 ;;  => "56be34521d144c88dbb8c733f0e8b3f6"
  35 ;;
  36 ;; (encode-hex-string
  37 ;;  (hmac-md5
  38 ;;   (make-string 50 ?\xcd)
  39 ;;   (decode-hex-string "0102030405060708090a0b0c0d0e0f10111213141516171819")))
  40 ;;  => "697eaf0aca3a3aea3a75164746ffaa79"
  41 ;;
  42 ;; (encode-hex-string
  43 ;;  (hmac-md5 "Test With Truncation" (make-string 16 ?\x0c)))
  44 ;;  => "56461ef2342edc00f9bab995690efd4c"
  45 ;;
  46 ;; (encode-hex-string
  47 ;;  (hmac-md5-96 "Test With Truncation" (make-string 16 ?\x0c)))
  48 ;;  => "56461ef2342edc00f9bab995"
  49 ;;
  50 ;; (encode-hex-string
  51 ;;  (hmac-md5
  52 ;;   "Test Using Larger Than Block-Size Key - Hash Key First"
  53 ;;   (make-string 80 ?\xaa)))
  54 ;;  => "6b1ab7fe4bd7bf8f0b62e6ce61b9d0cd"
  55 ;;
  56 ;; (encode-hex-string
  57 ;;  (hmac-md5
  58 ;;   "Test Using Larger Than Block-Size Key and Larger Than One Block-Size Data"
  59 ;;   (make-string 80 ?\xaa)))
  60 ;;  => "6f630fad67cda0ee1fb1f562db3aa53e"
  61
  62 ;;; Code:
  63
  64 (eval-when-compile (require 'hmac-def))
  65 (require 'hex-util)                     ; (decode-hex-string STRING)
  66 (require 'md5)                          ; expects (md5 STRING)
  67
  68 (defun md5-binary (string)
  69   "Return the MD5 of STRING in binary form."
  70   (if (condition-case nil
  71           ;; `md5' of v21 takes 4th arg CODING (and 5th arg NOERROR).
  72           (md5 "" nil nil 'binary)      ; => "d41d8cd98f00b204e9800998ecf8427e"
  73         (wrong-number-of-arguments nil))
  74       (decode-hex-string (md5 string nil nil 'binary))
  75     (decode-hex-string (md5 string))))
  76
  77 (define-hmac-function hmac-md5 md5-binary 64 16) ; => (hmac-md5 TEXT KEY)
  78 (define-hmac-function hmac-md5-96 md5-binary 64 16 96)
  79
  80 (provide 'hmac-md5)
  81
  82 ;;; hmac-md5.el ends here