mirror of
https://github.com/cryb-to/cryb-to.git
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100 lines
2.9 KiB
C
100 lines
2.9 KiB
C
/*-
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* Copyright (c) 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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* $Cryb$
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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 <inttypes.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <cryb/rfc4648.h>
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#include <cryb/strlcmp.h>
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#include <cryb/oath.h>
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char *
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oath_key_to_uri(const struct oath_key *key)
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{
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const char *hash;
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char *tmp, *uri;
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size_t kslen, urilen;
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switch (key->hash) {
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case oh_sha1:
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hash = "SHA1";
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break;
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case oh_sha256:
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hash = "SHA256";
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break;
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case oh_sha512:
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hash = "SHA512";
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break;
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case oh_md5:
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hash = "MD5";
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break;
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default:
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return (NULL);
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}
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/* XXX the label should be URI-encoded */
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if (key->mode == om_hotp) {
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urilen = asprintf(&uri, "otpauth://%s/%s?"
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"algorithm=%s&digits=%d&counter=%ju&secret=",
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"hotp", key->label, hash, key->digits,
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(uintmax_t)key->counter);
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} else if (key->mode == om_totp) {
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urilen = asprintf(&uri, "otpauth://%s/%s?"
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"algorithm=%s&digits=%d&period=%u&lastused=%ju&secret=",
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"totp", key->label, hash, key->digits, key->timestep,
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(uintmax_t)key->lastused);
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} else {
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/* unreachable */
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return (NULL);
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}
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/* compute length of base32-encoded key and append it */
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kslen = base32_enclen(key->keylen) + 1;
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if ((tmp = realloc(uri, urilen + kslen)) == NULL) {
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free(uri);
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return (NULL);
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}
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uri = tmp;
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if (base32_encode(key->key, key->keylen, uri + urilen, &kslen) != 0) {
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free(uri);
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return (NULL);
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}
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return (uri);
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}
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