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[elisp/gnus.git-] / lisp / sasl-cram.el

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+;;; sasl-cram.el --- CRAM-MD5 module for the SASL client framework
+
+;; Copyright (C) 2000 Free Software Foundation, Inc.
+
+;; Author: Daiki Ueno <ueno@unixuser.org>
+;;     Kenichi OKADA <okada@opaopa.org>
+;; Keywords: SASL, CRAM-MD5
+
+;; This file is part of FLIM (Faithful Library about Internet Message).
+
+;; This program 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.
+
+;; This program 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 this program; see the file COPYING.  If not, write to the
+;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
+
+;;; Commentary:
+
+(require 'sasl)
+(require 'hmac-md5)
+
+(defconst sasl-cram-md5-steps
+  '(ignore                             ;no initial response
+    sasl-cram-md5-response))
+
+(defun sasl-cram-md5-response (client step)
+  (let ((passphrase
+        (sasl-read-passphrase
+         (format "CRAM-MD5 passphrase for %s: "
+                 (sasl-client-name client)))))
+    (unwind-protect
+       (concat (sasl-client-name client) " "
+               (encode-hex-string
+                (hmac-md5 (sasl-step-data step) passphrase)))
+      (fillarray passphrase 0))))
+
+(put 'sasl-cram 'sasl-mechanism
+     (sasl-make-mechanism "CRAM-MD5" sasl-cram-md5-steps))
+
+(provide 'sasl-cram)
+
+;;; sasl-cram.el ends here