mirror of
https://github.com/cryb-to/cryb-to.git
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102 lines
2.9 KiB
C
102 lines
2.9 KiB
C
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/*-
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* Copyright (c) 2012-2013 Universitetet i Oslo
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* Author: Dag-Erling Smørgrav <des@des.no>
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* Sponsor: the University of Oslo
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*
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* $Id$
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*/
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#include "cryb/impl.h"
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#include <stdint.h>
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#include <string.h>
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#include <time.h>
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#include <cryb/oath.h>
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#define TOTP_TIME_STEP 30
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unsigned int
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oath_totp(const uint8_t *K, size_t Klen, unsigned int Digit)
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{
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time_t now;
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time(&now);
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return (oath_hotp(K, Klen, now / TOTP_TIME_STEP, Digit));
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}
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unsigned int
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oath_totp_current(const struct oath_key *k)
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{
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unsigned int code;
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uint64_t seq;
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if (k == NULL)
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return (-1);
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if (k->mode != om_totp)
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return (-1);
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if (k->timestep == 0)
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return (-1);
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seq = time(NULL) / k->timestep;
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code = oath_hotp(k->key, k->keylen, seq, k->digits);
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return (code);
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}
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/*
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* Compares the code provided by the user with expected values within a
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* given window. Returns 1 if there was a match, 0 if not, and -1 if an
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* error occurred.
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*/
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int
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oath_totp_match(struct oath_key *k, unsigned int response, int window)
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{
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unsigned int code;
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uint64_t seq;
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if (k == NULL)
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return (-1);
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if (window < 1)
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return (-1);
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if (k->mode != om_totp)
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return (-1);
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if (k->timestep == 0)
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return (-1);
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seq = time(NULL) / k->timestep;
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for (int i = -window; i <= window; ++i) {
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if (seq + i <= k->lastused)
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continue;
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code = oath_hotp(k->key, k->keylen, seq + i, k->digits);
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if (code == response && !k->dummy) {
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k->lastused = seq;
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return (1);
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}
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}
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return (0);
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}
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