139 lines
3.0 KiB
C
139 lines
3.0 KiB
C
/*
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* otpcli - CLI utility for generating OTPs
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*
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* Written in 2020-2021 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 <time.h>
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#include <unistd.h>
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#include "err.h"
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#include "strtonum.h"
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#include "otp.h"
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#define LINE_SIZE 16384
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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:\n"
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" %s [-d digits] [-h HMAC] -H counter SECRET\n"
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" %s [-d digits] [-h HMAC] [-s step] [-T counter] SECRET\n",
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__progname, __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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char *key;
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size_t key_len;
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uint64_t counter;
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unsigned int step;
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int32_t r;
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int ch, digits, do_hotp, do_totp;
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enum otp_hmac hmac;
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counter = (uint64_t)time(NULL);
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digits = 6;
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do_hotp = do_totp = 0;
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hmac = OTP_HMAC_SHA1;
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step = 30;
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while ((ch = getopt(argc, argv, "d:H:h:s:T:")) != -1) {
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switch (ch) {
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case 'd':
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digits = strtonum(optarg, 6, 10, &errstr);
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if (errstr != NULL)
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errx(1, "digits is %s: %s", errstr, optarg);
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break;
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case 'H':
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counter = strtonum(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 'h':
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if (strcasecmp(optarg, "sha1") == 0)
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hmac = OTP_HMAC_SHA1;
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else if (strcasecmp(optarg, "sha256") == 0)
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hmac = OTP_HMAC_SHA256;
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else if (strcasecmp(optarg, "sha512") == 0)
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hmac = OTP_HMAC_SHA512;
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else
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usage();
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break;
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case 's':
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step = strtonum(optarg, 1, UINT_MAX, &errstr);
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if (errstr != NULL)
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errx(1, "step is %s: %s", errstr, optarg);
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break;
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case 'T':
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counter = strtonum(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_totp = 1;
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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 (do_hotp && do_totp) {
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warnx("-H and -T are mutually exclusive");
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usage();
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}
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if (argc > 1)
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usage();
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if (argc == 1) {
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key = argv[0];
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key_len = strlen(key);
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} else {
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key = malloc(sizeof(uint8_t) * (LINE_SIZE + 1));
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if (key == NULL)
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err(1, "malloc");
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if (fgets(key, LINE_SIZE + 1, stdin) == NULL)
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err(1, "fgets");
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key_len = strlen(key);
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if (key[key_len - 1] == '\n') {
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key[key_len - 1] = '\0';
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key_len--;
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}
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}
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if (do_hotp) {
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r = hotp(hmac, key, key_len, counter, digits);
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if (r == -1)
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errx(1, "couldn't calculate HOTP");
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printf("%0*" PRId32 "\n", digits, r);
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} else {
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r = totp(hmac, key, key_len, counter, step, digits);
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if (r == -1)
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errx(1, "couldn't calculate TOTP");
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printf("%0*" PRId32 "\n", digits, r);
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}
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return 0;
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}
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