1/*
2 * Copyright (c) 1995, 1996, 1997 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * 3. Neither the name of the Institute nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#ifdef HAVE_CONFIG_H
35#include "config.h"
36RCSID("$Id$");
37#endif
38
39#include "otp_locl.h"
40
41extern const char *const std_dict[];
42
43unsigned
44otp_checksum (OtpKey key)
45{
46  int i;
47  unsigned sum = 0;
48
49  for (i = 0; i < OTPKEYSIZE; ++i)
50    sum += ((key[i] >> 0) & 0x03)
51      + ((key[i] >> 2) & 0x03)
52      + ((key[i] >> 4) & 0x03)
53      + ((key[i] >> 6) & 0x03);
54  sum &= 0x03;
55  return sum;
56}
57
58void
59otp_print_stddict (OtpKey key, char *str, size_t sz)
60{
61  unsigned sum;
62
63  sum = otp_checksum (key);
64  snprintf (str, sz,
65	    "%s %s %s %s %s %s",
66	    std_dict[(key[0] << 3) | (key[1] >> 5)],
67	    std_dict[((key[1] & 0x1F) << 6) | (key[2] >> 2)],
68	    std_dict[((key[2] & 0x03) << 9) | (key[3] << 1) | (key[4] >> 7)],
69	    std_dict[((key[4] & 0x7F) << 4) | (key[5] >> 4)],
70	    std_dict[((key[5] & 0x0F) << 7) | (key[6] >> 1)],
71	    std_dict[((key[6] & 0x01) << 10) | (key[7] << 2) | sum]);
72}
73
74void
75otp_print_hex (OtpKey key, char *str, size_t sz)
76{
77  snprintf (str, sz,
78	    "%02x%02x%02x%02x%02x%02x%02x%02x",
79	    key[0], key[1], key[2], key[3],
80	    key[4], key[5], key[6], key[7]);
81}
82
83void
84otp_print_hex_extended (OtpKey key, char *str, size_t sz)
85{
86  strlcpy (str, OTP_HEXPREFIX, sz);
87  otp_print_hex (key,
88		 str + strlen(OTP_HEXPREFIX),
89		 sz - strlen(OTP_HEXPREFIX));
90}
91
92void
93otp_print_stddict_extended (OtpKey key, char *str, size_t sz)
94{
95  strlcpy (str, OTP_WORDPREFIX, sz);
96  otp_print_stddict (key,
97		     str + strlen(OTP_WORDPREFIX),
98		     sz - strlen(OTP_WORDPREFIX));
99}
100