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 * Copyright (c) 2016 by Delphix. All rights reserved.
28 */
29 #include <sys/zfs_context.h>
30 #include <sys/zio.h>
31 #include <sys/sha2.h>
32 #include <sys/abd.h>
33
34 static int
sha_incremental(void * buf,size_t size,void * arg)35 sha_incremental(void *buf, size_t size, void *arg)
36 {
37 SHA2_CTX *ctx = arg;
38 SHA2Update(ctx, buf, size);
39 return (0);
40 }
41
42 /*ARGSUSED*/
43 void
abd_checksum_SHA256(abd_t * abd,uint64_t size,const void * ctx_template,zio_cksum_t * zcp)44 abd_checksum_SHA256(abd_t *abd, uint64_t size,
45 const void *ctx_template, zio_cksum_t *zcp)
46 {
47 SHA2_CTX ctx;
48 zio_cksum_t tmp;
49
50 SHA2Init(SHA256, &ctx);
51 (void) abd_iterate_func(abd, 0, size, sha_incremental, &ctx);
52 SHA2Final(&tmp, &ctx);
53
54 /*
55 * A prior implementation of this function had a
56 * private SHA256 implementation always wrote things out in
57 * Big Endian and there wasn't a byteswap variant of it.
58 * To preserve on disk compatibility we need to force that
59 * behavior.
60 */
61 zcp->zc_word[0] = BE_64(tmp.zc_word[0]);
62 zcp->zc_word[1] = BE_64(tmp.zc_word[1]);
63 zcp->zc_word[2] = BE_64(tmp.zc_word[2]);
64 zcp->zc_word[3] = BE_64(tmp.zc_word[3]);
65 }
66
67 /*ARGSUSED*/
68 void
abd_checksum_SHA512_native(abd_t * abd,uint64_t size,const void * ctx_template,zio_cksum_t * zcp)69 abd_checksum_SHA512_native(abd_t *abd, uint64_t size,
70 const void *ctx_template, zio_cksum_t *zcp)
71 {
72 SHA2_CTX ctx;
73
74 SHA2Init(SHA512_256, &ctx);
75 (void) abd_iterate_func(abd, 0, size, sha_incremental, &ctx);
76 SHA2Final(zcp, &ctx);
77 }
78
79 /*ARGSUSED*/
80 void
abd_checksum_SHA512_byteswap(abd_t * abd,uint64_t size,const void * ctx_template,zio_cksum_t * zcp)81 abd_checksum_SHA512_byteswap(abd_t *abd, uint64_t size,
82 const void *ctx_template, zio_cksum_t *zcp)
83 {
84 zio_cksum_t tmp;
85
86 abd_checksum_SHA512_native(abd, size, ctx_template, &tmp);
87 zcp->zc_word[0] = BSWAP_64(tmp.zc_word[0]);
88 zcp->zc_word[1] = BSWAP_64(tmp.zc_word[1]);
89 zcp->zc_word[2] = BSWAP_64(tmp.zc_word[2]);
90 zcp->zc_word[3] = BSWAP_64(tmp.zc_word[3]);
91 }
92