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/*
* S/KEY v1.1b (skey.c)
*
* Authors:
* Neil M. Haller <nmh@thumper.bellcore.com>
* Philip R. Karn <karn@chicago.qualcomm.com>
* John S. Walden <jsw@thumper.bellcore.com>
* Scott Chasin <chasin@crimelab.com>
*
*
* Stand-alone program for computing responses to S/Key challenges.
* Takes the iteration count and seed as command line args, prompts
* for the user's key, and produces both word and hex format responses.
*
* Usage example:
* >skey 88 ka9q2
* Enter password:
* OMEN US HORN OMIT BACK AHOY
* >
*
* $Id: skey.c,v 1.1 1995/10/18 08:46:07 deraadt Exp $
*/
#include <sys/cdefs.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <sgtty.h>
#include "md4.h"
#include "skey.h"
void usage __P((char *));
int
main(argc, argv)
int argc;
char *argv[];
{
int n, cnt, i, pass = 0;
char passwd[256], key[8], buf[33], *seed, *slash;
extern int optind;
extern char *optarg;
cnt = 1;
while ((i = getopt(argc, argv, "n:p:")) != EOF) {
switch (i) {
case 'n':
cnt = atoi(optarg);
break;
case 'p':
strcpy(passwd, optarg);
pass = 1;
break;
}
}
/* could be in the form <number>/<seed> */
if (argc <= optind + 1) {
/* look for / in it */
if (argc <= optind)
usage(argv[0]);
slash = strchr(argv[optind], '/');
if (slash == NULL)
usage(argv[0]);
*slash++ = '\0';
seed = slash;
if ((n = atoi(argv[optind])) < 0) {
fprintf(stderr, "%s not positive\n", argv[optind]);
usage(argv[0]);
}
} else {
if ((n = atoi(argv[optind])) < 0) {
fprintf(stderr, "%s not positive\n", argv[optind]);
usage(argv[0]);
}
seed = argv[++optind];
}
/* Get user's secret password */
if (!pass) {
fprintf(stderr, "Enter secret password: ");
readpass(passwd, sizeof(passwd));
}
rip(passwd);
/* Crunch seed and password into starting key */
if (keycrunch(key, seed, passwd) != 0) {
fprintf(stderr, "%s: key crunch failed\n", argv[0]);
exit(1);
}
if (cnt == 1) {
while (n-- != 0)
f(key);
printf("%s\n", btoe(buf, key));
#ifdef HEXIN
printf("%s\n", put8(buf, key));
#endif
} else {
for (i = 0; i <= n - cnt; i++)
f(key);
for (; i <= n; i++) {
#ifdef HEXIN
printf("%d: %-29s %s\n", i, btoe(buf, key), put8(buf, key));
#else
printf("%d: %-29s\n", i, btoe(buf, key));
#endif
f(key);
}
}
exit(0);
}
void
usage(s)
char *s;
{
fprintf(stderr,
"Usage: %s [-n count] [-p password ] sequence# [/] key\n", s);
exit(1);
}
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