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
|
/*
* "enigma.c" is in file cbw.tar from
* anonymous FTP host watmsg.waterloo.edu: pub/crypt/cbw.tar.Z
*
* A one-rotor machine designed along the lines of Enigma
* but considerably trivialized.
*
* A public-domain replacement for the UNIX "crypt" command.
*
* Upgraded to function properly on 64-bit machines.
*/
#include <sys/types.h>
#include <sys/wait.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define MINUSKVAR "CrYpTkEy"
#define ECHO 010
#define ROTORSZ 256
#define MASK 0377
char t1[ROTORSZ];
char t2[ROTORSZ];
char t3[ROTORSZ];
char deck[ROTORSZ];
char buf[13];
void shuffle(char *);
void
setup(pw)
char *pw;
{
int ic, i, k, temp, pf[2], pid;
unsigned random;
long seed;
strncpy(buf, pw, 8);
while (*pw)
*pw++ = '\0';
buf[8] = buf[0];
buf[9] = buf[1];
pipe(pf);
if ((pid=fork())==0) {
close(0);
close(1);
dup(pf[0]);
dup(pf[1]);
execlp("makekey", "-", 0);
execl("/usr/libexec/makekey", "-", 0); /* BSDI */
execl("/usr/lib/makekey", "-", 0);
execl("/usr/bin/makekey", "-", 0); /* IBM */
execl("/lib/makekey", "-", 0);
perror("makekey");
fprintf(stderr, "enigma: cannot execute 'makekey', aborting\n");
exit(1);
}
write(pf[1], buf, 10);
close(pf[1]);
i=wait((int *)NULL);
if (i<0) perror("enigma: wait");
if (i!=pid) {
fprintf(stderr, "enigma: expected pid %d, got pid %d\n", pid, i);
exit(1);
}
if ((i=read(pf[0], buf, 13)) != 13) {
fprintf(stderr, "enigma: cannot generate key, read %d\n",i);
exit(1);
}
seed = 123;
for (i=0; i<13; i++)
seed = seed*buf[i] + i;
for(i=0;i<ROTORSZ;i++) {
t1[i] = i;
deck[i] = i;
}
for(i=0;i<ROTORSZ;i++) {
seed = 5*seed + buf[i%13];
if( sizeof(long) > 4 ) {
/* Force seed to stay in 32-bit signed math */
if( seed & 0x80000000 )
seed = seed | (-1L & ~0xFFFFFFFFL);
else
seed &= 0x7FFFFFFF;
}
random = seed % 65521;
k = ROTORSZ-1 - i;
ic = (random&MASK)%(k+1);
random >>= 8;
temp = t1[k];
t1[k] = t1[ic];
t1[ic] = temp;
if(t3[k]!=0) continue;
ic = (random&MASK) % k;
while(t3[ic]!=0) ic = (ic+1) % k;
t3[k] = ic;
t3[ic] = k;
}
for(i=0;i<ROTORSZ;i++)
t2[t1[i]&MASK] = i;
}
int
main(argc, argv)
char *argv[];
{
register int i, n1, n2, nr1, nr2;
int secureflg = 0, kflag = 0;
char *cp;
if (argc > 1 && argv[1][0] == '-') {
if (argv[1][1] == 's') {
argc--;
argv++;
secureflg = 1;
} else if (argv[1][1] == 'k') {
argc--;
argv++;
kflag = 1;
}
}
if (kflag) {
if ((cp = getenv(MINUSKVAR)) == NULL) {
fprintf(stderr, "%s not set\n", MINUSKVAR);
exit(1);
}
setup(cp);
} else if (argc != 2) {
setup(getpass("Enter key:"));
}
else
setup(argv[1]);
n1 = 0;
n2 = 0;
nr2 = 0;
while((i=getchar()) != -1) {
if (secureflg) {
nr1 = deck[n1]&MASK;
nr2 = deck[nr1]&MASK;
} else {
nr1 = n1;
}
i = t2[(t3[(t1[(i+nr1)&MASK]+nr2)&MASK]-nr2)&MASK]-nr1;
putchar(i);
n1++;
if(n1==ROTORSZ) {
n1 = 0;
n2++;
if(n2==ROTORSZ) n2 = 0;
if (secureflg) {
shuffle(deck);
} else {
nr2 = n2;
}
}
}
return 0;
}
void
shuffle(deck)
char deck[];
{
int i, ic, k, temp;
unsigned random;
static long seed = 123;
for(i=0;i<ROTORSZ;i++) {
seed = 5*seed + buf[i%13];
random = seed % 65521;
k = ROTORSZ-1 - i;
ic = (random&MASK)%(k+1);
temp = deck[k];
deck[k] = deck[ic];
deck[ic] = temp;
}
}
|
