5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 * Copyright 2001,2002 Google, Inc.
20 * Copyright 2005 TRI-D Systems, Inc.
24 * IMPORTANT IMPORTANT IMPORTANT IMPORTANT IMPORTANT IMPORTANT
26 * In order to safely use challenge/response (async) mode, you must
27 * - implement a site-specific transform of the challenge, and/or
28 * - only allow async mode from secure locations.
30 * Note that you cannot easily just disallow async mode completely
31 * as you typically must provide a way to resynchronize the token.
33 * Please read the accompanying docs for more info.
35 * IMPORTANT IMPORTANT IMPORTANT IMPORTANT IMPORTANT IMPORTANT
41 static const char rcsid[] = "$Id$";
45 otp_challenge_transform(
47 __attribute__ ((unused))
50 unsigned char challenge[OTP_MAX_CHALLENGE_LEN],
55 for (i = 0; i < clen; ++clen)