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