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
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
|
/*
* X9.9 calculator
* This software is provided AS IS with no express or implied warranty
* October 1995, Paul Borman <prb@krystal.com>
*/
#include <sys/param.h>
#include <sys/stat.h>
#include <ctype.h>
#include <err.h>
#include <pwd.h>
#include <readpassphrase.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <des.h>
#define KEYFILE ".keyfile.des"
#define HEXDIGITS "0123456789abcdef"
#define DECDIGITS "0123456789012345"
void predict(des_key_schedule, char *, int);
char *digits = HEXDIGITS;
extern char *__progname;
int
main(int argc, char **argv)
{
int i;
char buf[256];
des_key_schedule ks;
des_cblock key;
char _keyfile[MAXPATHLEN];
char *keyfile = 0;
FILE *fp;
int init = 0;
int hex = 1;
int cnt = 1;
unsigned int pin;
struct passwd *pwd;
while ((i = getopt(argc, argv, "dk:in:")) != -1) {
switch (i) {
case 'k':
keyfile = optarg;
break;
case 'i':
init = 1;
break;
case 'd':
hex = 0;
break;
case 'n':
cnt = atoi(optarg);
if (cnt <= 0)
err(1, "invalid count: %s", optarg);
break;
default:
fprintf(stderr, "usage: %s [-n cnt] [-h] [-k keyfile]\n"
" %s -i [-k keyfile]\n", __progname,
__progname);
exit(1);
}
}
if (!keyfile) {
if ((pwd = getpwuid(getuid())) == NULL) {
fprintf(stderr, "Say, just who are you, anyhow?\n");
exit(1);
}
snprintf(_keyfile, sizeof(_keyfile), "%s/%s", pwd->pw_dir,
KEYFILE);
keyfile = _keyfile;
}
if (init)
readpassphrase("Enter Key: ", buf, sizeof(buf), 0);
else if ((fp = fopen(keyfile, "r")) == NULL)
err(1, "unable to open %s", keyfile);
else {
if (fgets(buf, sizeof(buf), fp) == NULL) {
fprintf(stderr, "No key in %s\n", keyfile);
exit(1);
}
fclose(fp);
}
memset(key, 0, sizeof(key));
if (init && buf[3] == ' ') {
char *b = buf;
/* Assume octal input */
for (i = 0; i < 8; ++i) {
if (!*b) {
fprintf(stderr, "%s: invalid key\n", buf);
}
while (isdigit(*b))
key[i] = key[i] << 3 | *b++ - '0';
while (*b && !isdigit(*b))
++b;
}
} else {
for (i = 0; i < 16; ++i) {
int d;
if (islower(buf[i]))
buf[i] = toupper(buf[i]);
if (buf[i] >= '0' && buf[i] <= '9')
d = buf[i] - '0';
else if (buf[i] >= 'A' && buf[i] <= 'F')
d = buf[i] - 'A' + 10;
else {
fprintf(stderr, "invalid key: %s\n", buf);
exit(1);
}
key[i>>1] |= d << ((i & 1) ? 0 : 4);
}
}
/* XXX - should warn on non-space or non-digit */
readpassphrase("Enter Pin: ", buf, sizeof(buf), 0);
for (i = 0, pin = 0; buf[i] && buf[i] != '\n'; ++i)
if (isdigit(buf[i]))
pin = pin * 16 + buf[i] - '0' + 1;
if ((pin & 0xffff0000) == 0)
pin |= pin << 16;
for (i = 0; i < 8; ++i)
key[0] ^= (pin >> ((i * 7) % 26)) & 0x7f;
if (init) {
if ((fp = fopen(keyfile, "w")) == NULL)
err(1, "could not open %s for writing", keyfile);
fchmod(fileno(fp), 0600);
for (i = 0; i < 8; ++i) {
fprintf(fp, "%c", digits[(key[i]>>4)&0xf]);
fprintf(fp, "%c", digits[(key[i]>>0)&0xf]);
}
fputc('\n', fp);
fclose(fp);
exit(0);
}
des_fixup_key_parity(&key);
des_key_sched(&key, ks);
buf[0] = '\0';
readpassphrase("Enter challenge: ", buf, sizeof(buf), RPP_ECHO_ON);
if (buf[0] == '\0')
exit(0);
for (i = 0; i < 8; ++i)
if (buf[i] == '\n')
buf[i] = '\0';
if (!hex)
digits = DECDIGITS;
predict(ks, buf, cnt);
memset(&ks, 0, sizeof(ks));
memset(buf, 0, sizeof(buf));
exit(0);
}
void
predict(des_key_schedule ks, char *chal, int cnt)
{
int i;
des_cblock cb;
while (cnt-- > 0) {
printf("%.8s: ", chal);
des_ecb_encrypt((des_cblock *)chal, &cb, ks, DES_ENCRYPT);
for (i = 0; i < 4; ++i) {
printf("%c", digits[(cb[i]>>4) & 0xf]);
printf("%c", digits[(cb[i]>>0) & 0xf]);
}
putchar('\n');
for (i = 0; i < 8; ++i) {
if ((cb[i] &= 0xf) > 9)
cb[i] -= 10;
cb[i] |= 0x30;
}
}
memset(&cb, 0, sizeof(cb));
}
|
