mirror of
https://github.com/cryb-to/cryb-to.git
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115 lines
3.1 KiB
C
115 lines
3.1 KiB
C
/*-
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* Copyright (c) 2013-2014 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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#include "cryb/impl.h"
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#include <sys/types.h>
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#include <stdint.h>
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#include <string.h>
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#include <cryb/oath.h>
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#include <cryb/rand.h>
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#include <cryb/strlcpy.h>
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/*
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* Initialize an OATH key with the specified parameters.
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*/
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int
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oath_key_create(oath_key *ok,
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oath_mode mode, oath_hash hash, unsigned int digits,
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const char *issuer, const char *label,
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const char *keydata, size_t keylen)
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{
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memset(ok, 0, sizeof *ok);
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/* check issuer */
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if (issuer == NULL ||
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strlcpy(ok->issuer, issuer, sizeof ok->issuer) >= sizeof ok->issuer)
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goto fail;
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/* check label */
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if (label == NULL ||
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strlcpy(ok->label, label, sizeof ok->label) >= sizeof ok->label)
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goto fail;
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/* check mode */
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switch (mode) {
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case om_totp:
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ok->timestep = 30;
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/* fall through */
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case om_hotp:
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ok->mode = mode;
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break;
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default:
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goto fail;
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}
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/* check hash */
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switch (hash) {
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case oh_undef:
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hash = oh_sha1;
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/* fall through */
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case oh_md5:
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case oh_sha1:
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case oh_sha256:
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case oh_sha512:
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ok->hash = hash;
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break;
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default:
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goto fail;
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}
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/* check digits */
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if (digits == 0)
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digits = OATH_DEF_DIGITS;
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if (digits < OATH_MIN_DIGITS || digits > OATH_MAX_DIGITS)
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goto fail;
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ok->digits = digits;
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/* check key length */
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if (keydata == NULL && keylen == 0)
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keylen = OATH_DEF_KEYLEN;
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if (keylen < OATH_MIN_KEYLEN || keylen > OATH_MAX_KEYLEN)
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goto fail;
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ok->keylen = keylen;
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/* copy or generate key */
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if (keydata != NULL)
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memcpy(ok->key, keydata, ok->keylen);
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else if (rand_bytes(ok->key, ok->keylen) != (ssize_t)ok->keylen)
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goto fail;
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return (0);
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fail:
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memset(ok, 0, sizeof *ok);
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return (-1);
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}
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