lisp/net/sasl-cram.el

   1 ;;; sasl-cram.el --- CRAM-MD5 module for the SASL client framework
   2
   3 ;; Copyright (C) 2000, 2007-2013 Free Software Foundation, Inc.
   4
   5 ;; Author: Daiki Ueno <ueno@unixuser.org>
   6 ;;      Kenichi OKADA <okada@opaopa.org>
   7 ;; Keywords: SASL, CRAM-MD5
   8 ;; Package: sasl
   9
  10 ;; This file is part of GNU Emacs.
  11
  12 ;; GNU Emacs is free software: you can redistribute it and/or modify
  13 ;; it under the terms of the GNU General Public License as published by
  14 ;; the Free Software Foundation, either version 3 of the License, or
  15 ;; (at your option) any later version.
  16
  17 ;; GNU Emacs is distributed in the hope that it will be useful,
  18 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 ;; GNU General Public License for more details.
  21
  22 ;; You should have received a copy of the GNU General Public License
  23 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  24
  25 ;;; Commentary:
  26
  27 (require 'sasl)
  28 (require 'hmac-md5)
  29
  30 (defconst sasl-cram-md5-steps
  31   '(ignore                              ;no initial response
  32     sasl-cram-md5-response))
  33
  34 (defun sasl-cram-md5-response (client step)
  35   (let ((passphrase
  36          (sasl-read-passphrase
  37           (format "CRAM-MD5 passphrase for %s: "
  38                   (sasl-client-name client)))))
  39     (unwind-protect
  40         (concat (sasl-client-name client) " "
  41                 (encode-hex-string
  42                  (hmac-md5 (sasl-step-data step) passphrase)))
  43       (fillarray passphrase 0))))
  44
  45 (put 'sasl-cram 'sasl-mechanism
  46      (sasl-make-mechanism "CRAM-MD5" sasl-cram-md5-steps))
  47
  48 (provide 'sasl-cram)
  49
  50 ;;; sasl-cram.el ends here