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To prevent replay attacks, HOTP uses a counter, while TOTP keeps track of the time the key was last used. Since these values have the same type and are never used at the same time, merge them into an anonymous union.
75 lines
2.3 KiB
C
75 lines
2.3 KiB
C
/*-
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* Copyright (c) 2012-2013 The University of Oslo
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* Copyright (c) 2018 Dag-Erling Smørgrav
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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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#ifndef OATH_TYPES_H_INCLUDED
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#define OATH_TYPES_H_INCLUDED
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#ifndef CRYB_TO
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#include <cryb/to.h>
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#endif
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CRYB_BEGIN
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#define oath_key cryb_oath_key
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/*
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* OATH key and associated parameters
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*/
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typedef struct {
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/* mode and parameters */
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oath_mode mode;
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oath_hash hash;
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unsigned int digits;
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union {
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uint64_t counter; /* HOTP */
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uint64_t lastused; /* TOTP */
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};
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unsigned int timestep; /* TOTP only - in seconds */
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/* housekeeping */
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unsigned int dummy:1; /* dummy key, always fail */
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/* issuer */
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size_t issuerlen; /* bytes incl. NUL */
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char issuer[OATH_MAX_ISSUERLEN];
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/* label */
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size_t labellen; /* bytes incl. NUL */
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char label[OATH_MAX_LABELLEN];
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/* key */
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size_t keylen; /* bytes */
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uint8_t key[OATH_MAX_KEYLEN];
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} oath_key;
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CRYB_END
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#endif
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