86 lines
1.8 KiB
C
86 lines
1.8 KiB
C
/*
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* otpcli - CLI utility for generating OTPs
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*
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* Written in 2020 by Lucas
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*
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* To the extent possible under law, the author(s) have dedicated all
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* copyright and related and neighboring rights to this software to the
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* public domain worldwide. This software is distributed without any
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* warranty.
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*
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* You should have received a copy of the CC0 Public Domain Dedication
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* along with this software. If not, see
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* <http://creativecommons.org/publicdomain/zero/1.0/>.
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*/
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#include <errno.h>
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#include <inttypes.h>
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#include <limits.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 <unistd.h>
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#include "err.h"
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#include "mystrtonum.h"
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#include "otp.h"
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extern const char *__progname;
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static void
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usage(void)
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{
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fprintf(stderr, "Usage: %s [-H counter] SECRET\n", __progname);
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exit(1);
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}
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int
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main(int argc, char *argv[])
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{
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const char *errstr;
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uint64_t counter;
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int32_t r;
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int ch, do_hotp;
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counter = 0;
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do_hotp = 0;
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while ((ch = getopt(argc, argv, "H:T:")) != -1) {
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switch (ch) {
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case 'H':
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counter = mystrtonum(optarg, 0, LLONG_MAX, &errstr);
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if (errstr != NULL)
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errx(1, "counter is %s: %s", errstr, optarg);
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do_hotp = 1;
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break;
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case 'T':
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counter = mystrtonum(optarg, 0, LLONG_MAX, &errstr);
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if (errstr != NULL)
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errx(1, "counter is %s: %s", errstr, optarg);
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do_hotp = 0;
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break;
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default:
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usage();
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}
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}
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argc -= optind;
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argv += optind;
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if (argc != 1)
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usage();
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if (do_hotp) {
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r = hotp(OTP_HMAC_SHA1, argv[0], strlen(argv[0]), counter, 6);
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if (r == -1)
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errx(1, "couldn't calculate HOTP");
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printf("%" PRId32 "\n", r);
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} else {
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r = totp(OTP_HMAC_SHA1, argv[0], strlen(argv[0]), counter,
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30, 8);
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if (r == -1)
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errx(1, "couldn't calculate TOTP");
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printf("%" PRId32 "\n", r);
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}
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return 0;
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}
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