2 * Copyright (c) 2011 Pawel Jakub Dawidek <pawel@dawidek.net>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
40 #include "hast_checksum.h"
42 #define MAX_HASH_SIZE SHA256_DIGEST_LENGTH
45 hast_crc32_checksum(const unsigned char *data, size_t size,
46 unsigned char *hash, size_t *hsizep)
50 crc = crc32(data, size);
51 /* XXXPJD: Do we have to use htole32() on crc first? */
52 bcopy(&crc, hash, sizeof(crc));
53 *hsizep = sizeof(crc);
57 hast_sha256_checksum(const unsigned char *data, size_t size,
58 unsigned char *hash, size_t *hsizep)
63 SHA256_Update(&ctx, data, size);
64 SHA256_Final(hash, &ctx);
65 *hsizep = SHA256_DIGEST_LENGTH;
69 checksum_name(int num)
73 case HAST_CHECKSUM_NONE:
75 case HAST_CHECKSUM_CRC32:
77 case HAST_CHECKSUM_SHA256:
84 checksum_send(const struct hast_resource *res, struct nv *nv, void **datap,
85 size_t *sizep, bool *freedatap __unused)
87 unsigned char hash[MAX_HASH_SIZE];
90 switch (res->hr_checksum) {
91 case HAST_CHECKSUM_NONE:
93 case HAST_CHECKSUM_CRC32:
94 hast_crc32_checksum(*datap, *sizep, hash, &hsize);
96 case HAST_CHECKSUM_SHA256:
97 hast_sha256_checksum(*datap, *sizep, hash, &hsize);
100 PJDLOG_ABORT("Invalid checksum: %d.", res->hr_checksum);
102 nv_add_string(nv, checksum_name(res->hr_checksum), "checksum");
103 nv_add_uint8_array(nv, hash, hsize, "hash");
104 if (nv_error(nv) != 0) {
105 errno = nv_error(nv);
112 checksum_recv(const struct hast_resource *res __unused, struct nv *nv,
113 void **datap, size_t *sizep, bool *freedatap __unused)
115 unsigned char chash[MAX_HASH_SIZE];
116 const unsigned char *rhash;
117 size_t chsize, rhsize;
120 algo = nv_get_string(nv, "checksum");
122 return (0); /* No checksum. */
123 rhash = nv_get_uint8_array(nv, &rhsize, "hash");
125 pjdlog_error("Hash is missing.");
126 return (-1); /* Hash not found. */
128 if (strcmp(algo, "crc32") == 0)
129 hast_crc32_checksum(*datap, *sizep, chash, &chsize);
130 else if (strcmp(algo, "sha256") == 0)
131 hast_sha256_checksum(*datap, *sizep, chash, &chsize);
133 pjdlog_error("Unknown checksum algorithm '%s'.", algo);
134 return (-1); /* Unknown checksum algorithm. */
136 if (rhsize != chsize) {
137 pjdlog_error("Invalid hash size (%zu) for %s, should be %zu.",
138 rhsize, algo, chsize);
139 return (-1); /* Different hash size. */
141 if (bcmp(rhash, chash, chsize) != 0) {
142 pjdlog_error("Hash mismatch.");
143 return (-1); /* Hash mismatch. */