161 lines
4.3 KiB
C
161 lines
4.3 KiB
C
/*-
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* Copyright (c) 2011 Pawel Jakub Dawidek <pawel@dawidek.net>
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS 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 AUTHORS 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 <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <errno.h>
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#include <string.h>
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#include <strings.h>
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#ifdef HAVE_CRYPTO
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#include <openssl/sha.h>
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#endif
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#include <crc32.h>
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#include <hast.h>
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#include <nv.h>
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#include <pjdlog.h>
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#include "hast_checksum.h"
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#ifdef HAVE_CRYPTO
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#define MAX_HASH_SIZE SHA256_DIGEST_LENGTH
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#else
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#define MAX_HASH_SIZE 4
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#endif
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static void
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hast_crc32_checksum(const unsigned char *data, size_t size,
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unsigned char *hash, size_t *hsizep)
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{
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uint32_t crc;
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crc = crc32(data, size);
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/* XXXPJD: Do we have to use htole32() on crc first? */
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bcopy(&crc, hash, sizeof(crc));
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*hsizep = sizeof(crc);
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}
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#ifdef HAVE_CRYPTO
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static void
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hast_sha256_checksum(const unsigned char *data, size_t size,
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unsigned char *hash, size_t *hsizep)
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{
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SHA256_CTX ctx;
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SHA256_Init(&ctx);
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SHA256_Update(&ctx, data, size);
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SHA256_Final(hash, &ctx);
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*hsizep = SHA256_DIGEST_LENGTH;
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}
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#endif /* HAVE_CRYPTO */
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const char *
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checksum_name(int num)
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{
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switch (num) {
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case HAST_CHECKSUM_NONE:
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return ("none");
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case HAST_CHECKSUM_CRC32:
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return ("crc32");
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case HAST_CHECKSUM_SHA256:
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return ("sha256");
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}
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return ("unknown");
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}
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int
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checksum_send(const struct hast_resource *res, struct nv *nv, void **datap,
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size_t *sizep, bool *freedatap __unused)
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{
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unsigned char hash[MAX_HASH_SIZE];
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size_t hsize;
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switch (res->hr_checksum) {
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case HAST_CHECKSUM_NONE:
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return (0);
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case HAST_CHECKSUM_CRC32:
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hast_crc32_checksum(*datap, *sizep, hash, &hsize);
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break;
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#ifdef HAVE_CRYPTO
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case HAST_CHECKSUM_SHA256:
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hast_sha256_checksum(*datap, *sizep, hash, &hsize);
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break;
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#endif
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default:
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PJDLOG_ABORT("Invalid checksum: %d.", res->hr_checksum);
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}
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nv_add_string(nv, checksum_name(res->hr_checksum), "checksum");
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nv_add_uint8_array(nv, hash, hsize, "hash");
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if (nv_error(nv) != 0) {
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errno = nv_error(nv);
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return (-1);
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}
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return (0);
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}
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int
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checksum_recv(const struct hast_resource *res __unused, struct nv *nv,
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void **datap, size_t *sizep, bool *freedatap __unused)
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{
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unsigned char chash[MAX_HASH_SIZE];
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const unsigned char *rhash;
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size_t chsize, rhsize;
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const char *algo;
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algo = nv_get_string(nv, "checksum");
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if (algo == NULL)
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return (0); /* No checksum. */
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rhash = nv_get_uint8_array(nv, &rhsize, "hash");
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if (rhash == NULL) {
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pjdlog_error("Hash is missing.");
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return (-1); /* Hash not found. */
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}
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if (strcmp(algo, "crc32") == 0)
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hast_crc32_checksum(*datap, *sizep, chash, &chsize);
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#ifdef HAVE_CRYPTO
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else if (strcmp(algo, "sha256") == 0)
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hast_sha256_checksum(*datap, *sizep, chash, &chsize);
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#endif
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else {
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pjdlog_error("Unknown checksum algorithm '%s'.", algo);
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return (-1); /* Unknown checksum algorithm. */
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}
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if (rhsize != chsize) {
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pjdlog_error("Invalid hash size (%zu) for %s, should be %zu.",
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rhsize, algo, chsize);
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return (-1); /* Different hash size. */
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}
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if (bcmp(rhash, chash, chsize) != 0) {
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pjdlog_error("Hash mismatch.");
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return (-1); /* Hash mismatch. */
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}
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return (0);
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}
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