sha256.c revision 290757 
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/*
26 * Copyright 2013 Saso Kiselkov. All rights reserved.
27 */
28#include <sys/zfs_context.h>
29#include <sys/zio.h>
30#ifdef _KERNEL
31#include <crypto/sha2/sha2.h>
32#else
33#include <sha256.h>
34#endif
35
36/*ARGSUSED*/
37void
38zio_checksum_SHA256(const void *buf, uint64_t size,
39    const void *ctx_template, zio_cksum_t *zcp)
40{
41	SHA256_CTX ctx;
42	zio_cksum_t tmp;
43
44	SHA256_Init(&ctx);
45	SHA256_Update(&ctx, buf, size);
46	SHA256_Final((unsigned char *)&tmp, &ctx);
47
48	/*
49	 * A prior implementation of this function had a
50	 * private SHA256 implementation always wrote things out in
51	 * Big Endian and there wasn't a byteswap variant of it.
52	 * To preseve on disk compatibility we need to force that
53	 * behaviour.
54	 */
55	zcp->zc_word[0] = BE_64(tmp.zc_word[0]);
56	zcp->zc_word[1] = BE_64(tmp.zc_word[1]);
57	zcp->zc_word[2] = BE_64(tmp.zc_word[2]);
58	zcp->zc_word[3] = BE_64(tmp.zc_word[3]);
59}
60
61#ifdef illumos
62/*ARGSUSED*/
63void
64zio_checksum_SHA512_native(const void *buf, uint64_t size,
65    const void *ctx_template, zio_cksum_t *zcp)
66{
67	SHA2_CTX	ctx;
68
69	SHA2Init(SHA512_256, &ctx);
70	SHA2Update(&ctx, buf, size);
71	SHA2Final(zcp, &ctx);
72}
73
74/*ARGSUSED*/
75void
76zio_checksum_SHA512_byteswap(const void *buf, uint64_t size,
77    const void *ctx_template, zio_cksum_t *zcp)
78{
79	zio_cksum_t	tmp;
80
81	zio_checksum_SHA512_native(buf, size, ctx_template, &tmp);
82	zcp->zc_word[0] = BSWAP_64(tmp.zc_word[0]);
83	zcp->zc_word[1] = BSWAP_64(tmp.zc_word[1]);
84	zcp->zc_word[2] = BSWAP_64(tmp.zc_word[2]);
85	zcp->zc_word[3] = BSWAP_64(tmp.zc_word[3]);
86}
87#endif
88