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/*
* "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.
*/
#ifndef lint
static const char rcsid[] =
"$FreeBSD$";
#endif /* not lint */
#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(char *);
void
setup(pw)
char *pw;
{
int ic, i, k, temp, pf[2], pid;
unsigned rnd;
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", "-", (char *)0);
execl("/usr/libexec/makekey", "-", (char *)0); /* BSDI */
execl("/usr/lib/makekey", "-", (char *)0);
execl("/usr/bin/makekey", "-", (char *)0); /* IBM */
execl("/lib/makekey", "-", (char *)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;
}
rnd = seed % 65521;
k = ROTORSZ-1 - i;
ic = (rnd&MASK)%(k+1);
rnd >>= 8;
temp = t1[k];
t1[k] = t1[ic];
t1[ic] = temp;
if(t3[k]!=0) continue;
ic = (rnd&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)
int argc;
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(deckary)
char deckary[];
{
int i, ic, k, temp;
unsigned rnd;
static long seed = 123;
for(i=0;i<ROTORSZ;i++) {
seed = 5*seed + buf[i%13];
rnd = seed % 65521;
k = ROTORSZ-1 - i;
ic = (rnd&MASK)%(k+1);
temp = deckary[k];
deckary[k] = deckary[ic];
deckary[ic] = temp;
}
}
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