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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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/types.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
static char t1[ROTORSZ];
static char t2[ROTORSZ];
static char t3[ROTORSZ];
static char deck[ROTORSZ];
static char buf[13];
static void shuffle(char *);
static void setup(char *);
static void
setup(char *pw)
{
int ic, i, k, temp;
char salt[3];
unsigned rnd;
int32_t seed;
char *cryptpw;
strlcpy(salt, pw, sizeof(salt));
cryptpw = crypt(pw, salt);
if (cryptpw == NULL) {
fprintf(stderr, "crypt(3) failure\n");
exit(1);
}
memcpy(buf, cryptpw, sizeof(buf));
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];
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(int argc, char *argv[])
{
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;
}
static void
shuffle(char deckary[])
{
int i, ic, k, temp;
unsigned rnd;
static int32_t 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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