1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21/*
22 * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
23 * Use is subject to license terms.
24 */
25#include <sys/zfs_context.h>
26#include <sys/zio.h>
27#ifdef _KERNEL
28#include <crypto/sha2/sha2.h>
29#else
30#include <sha256.h>
31#endif
32
33void
34zio_checksum_SHA256(const void *buf, uint64_t size, zio_cksum_t *zcp)
35{
36	SHA256_CTX ctx;
37	zio_cksum_t tmp;
38
39	SHA256_Init(&ctx);
40	SHA256_Update(&ctx, buf, size);
41	SHA256_Final((unsigned char *)&tmp, &ctx);
42
43	/*
44	 * A prior implementation of this function had a
45	 * private SHA256 implementation always wrote things out in
46	 * Big Endian and there wasn't a byteswap variant of it.
47	 * To preseve on disk compatibility we need to force that
48	 * behaviour.
49	 */
50	zcp->zc_word[0] = BE_64(tmp.zc_word[0]);
51	zcp->zc_word[1] = BE_64(tmp.zc_word[1]);
52	zcp->zc_word[2] = BE_64(tmp.zc_word[2]);
53	zcp->zc_word[3] = BE_64(tmp.zc_word[3]);
54}
55