127 lines
2.5 KiB
C
127 lines
2.5 KiB
C
/*
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* S/KEY v1.1b (skey.c)
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*
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* Authors:
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* Neil M. Haller <nmh@thumper.bellcore.com>
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* Philip R. Karn <karn@chicago.qualcomm.com>
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* John S. Walden <jsw@thumper.bellcore.com>
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* Scott Chasin <chasin@crimelab.com>
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*
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*
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* Stand-alone program for computing responses to S/Key challenges.
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* Takes the iteration count and seed as command line args, prompts
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* for the user's key, and produces both word and hex format responses.
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*
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* Usage example:
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* >skey 88 ka9q2
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* Enter password:
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* OMEN US HORN OMIT BACK AHOY
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* >
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*
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* $Id: skey.c,v 1.3 1995/06/05 19:55:40 pk Exp $
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*/
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#include <sys/cdefs.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <fcntl.h>
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#include <sgtty.h>
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#include "md4.h"
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#include "skey.h"
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void usage __P((char *));
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int
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main(argc, argv)
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int argc;
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char *argv[];
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{
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int n, cnt, i, pass = 0;
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char passwd[256], key[8], buf[33], *seed, *slash;
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extern int optind;
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extern char *optarg;
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cnt = 1;
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while ((i = getopt(argc, argv, "n:p:")) != EOF) {
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switch (i) {
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case 'n':
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cnt = atoi(optarg);
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break;
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case 'p':
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strcpy(passwd, optarg);
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pass = 1;
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break;
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}
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}
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/* could be in the form <number>/<seed> */
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if (argc <= optind + 1) {
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/* look for / in it */
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if (argc <= optind)
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usage(argv[0]);
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slash = strchr(argv[optind], '/');
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if (slash == NULL)
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usage(argv[0]);
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*slash++ = '\0';
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seed = slash;
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if ((n = atoi(argv[optind])) < 0) {
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fprintf(stderr, "%s not positive\n", argv[optind]);
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usage(argv[0]);
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}
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} else {
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if ((n = atoi(argv[optind])) < 0) {
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fprintf(stderr, "%s not positive\n", argv[optind]);
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usage(argv[0]);
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}
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seed = argv[++optind];
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}
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/* Get user's secret password */
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if (!pass) {
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fprintf(stderr, "Enter secret password: ");
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readpass(passwd, sizeof(passwd));
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}
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rip(passwd);
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/* Crunch seed and password into starting key */
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if (keycrunch(key, seed, passwd) != 0) {
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fprintf(stderr, "%s: key crunch failed\n", argv[0]);
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exit(1);
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}
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if (cnt == 1) {
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while (n-- != 0)
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f(key);
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printf("%s\n", btoe(buf, key));
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#ifdef HEXIN
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printf("%s\n", put8(buf, key));
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#endif
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} else {
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for (i = 0; i <= n - cnt; i++)
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f(key);
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for (; i <= n; i++) {
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#ifdef HEXIN
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printf("%d: %-29s %s\n", i, btoe(buf, key), put8(buf, key));
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#else
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printf("%d: %-29s\n", i, btoe(buf, key));
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#endif
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f(key);
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}
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}
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exit(0);
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}
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void
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usage(s)
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char *s;
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{
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fprintf(stderr,
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"Usage: %s [-n count] [-p password ] sequence# [/] key\n", s);
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exit(1);
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}
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