2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2011 Pawel Jakub Dawidek <pawel@dawidek.net>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
42 #include "hast_checksum.h"
44 #define MAX_HASH_SIZE SHA256_DIGEST_LENGTH
47 hast_crc32_checksum(const unsigned char *data, size_t size,
48 unsigned char *hash, size_t *hsizep)
52 crc = crc32(data, size);
53 /* XXXPJD: Do we have to use htole32() on crc first? */
54 bcopy(&crc, hash, sizeof(crc));
55 *hsizep = sizeof(crc);
59 hast_sha256_checksum(const unsigned char *data, size_t size,
60 unsigned char *hash, size_t *hsizep)
65 SHA256_Update(&ctx, data, size);
66 SHA256_Final(hash, &ctx);
67 *hsizep = SHA256_DIGEST_LENGTH;
71 checksum_name(int num)
75 case HAST_CHECKSUM_NONE:
77 case HAST_CHECKSUM_CRC32:
79 case HAST_CHECKSUM_SHA256:
86 checksum_send(const struct hast_resource *res, struct nv *nv, void **datap,
87 size_t *sizep, bool *freedatap __unused)
89 unsigned char hash[MAX_HASH_SIZE];
92 switch (res->hr_checksum) {
93 case HAST_CHECKSUM_NONE:
95 case HAST_CHECKSUM_CRC32:
96 hast_crc32_checksum(*datap, *sizep, hash, &hsize);
98 case HAST_CHECKSUM_SHA256:
99 hast_sha256_checksum(*datap, *sizep, hash, &hsize);
102 PJDLOG_ABORT("Invalid checksum: %d.", res->hr_checksum);
104 nv_add_string(nv, checksum_name(res->hr_checksum), "checksum");
105 nv_add_uint8_array(nv, hash, hsize, "hash");
106 if (nv_error(nv) != 0) {
107 errno = nv_error(nv);
114 checksum_recv(const struct hast_resource *res __unused, struct nv *nv,
115 void **datap, size_t *sizep, bool *freedatap __unused)
117 unsigned char chash[MAX_HASH_SIZE];
118 const unsigned char *rhash;
119 size_t chsize, rhsize;
122 algo = nv_get_string(nv, "checksum");
124 return (0); /* No checksum. */
125 rhash = nv_get_uint8_array(nv, &rhsize, "hash");
127 pjdlog_error("Hash is missing.");
128 return (-1); /* Hash not found. */
130 if (strcmp(algo, "crc32") == 0)
131 hast_crc32_checksum(*datap, *sizep, chash, &chsize);
132 else if (strcmp(algo, "sha256") == 0)
133 hast_sha256_checksum(*datap, *sizep, chash, &chsize);
135 pjdlog_error("Unknown checksum algorithm '%s'.", algo);
136 return (-1); /* Unknown checksum algorithm. */
138 if (rhsize != chsize) {
139 pjdlog_error("Invalid hash size (%zu) for %s, should be %zu.",
140 rhsize, algo, chsize);
141 return (-1); /* Different hash size. */
143 if (bcmp(rhash, chash, chsize) != 0) {
144 pjdlog_error("Hash mismatch.");
145 return (-1); /* Hash mismatch. */