1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
|
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://opensource.org/licenses/CDDL-1.0.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2013 Saso Kiselkov. All rights reserved.
* Copyright (c) 2016 by Delphix. All rights reserved.
*/
#include <sys/zfs_context.h>
#include <sys/zio.h>
#include <sys/zio_checksum.h>
#include <sys/skein.h>
#include <sys/abd.h>
static int
skein_incremental(void *buf, size_t size, void *arg)
{
Skein_512_Ctxt_t *ctx = arg;
(void) Skein_512_Update(ctx, buf, size);
return (0);
}
/*
* Computes a native 256-bit skein MAC checksum. Please note that this
* function requires the presence of a ctx_template that should be allocated
* using abd_checksum_skein_tmpl_init.
*/
void
abd_checksum_skein_native(abd_t *abd, uint64_t size,
const void *ctx_template, zio_cksum_t *zcp)
{
Skein_512_Ctxt_t ctx;
ASSERT(ctx_template != NULL);
memcpy(&ctx, ctx_template, sizeof (ctx));
(void) abd_iterate_func(abd, 0, size, skein_incremental, &ctx);
(void) Skein_512_Final(&ctx, (uint8_t *)zcp);
memset(&ctx, 0, sizeof (ctx));
}
/*
* Byteswapped version of abd_checksum_skein_native. This just invokes
* the native checksum function and byteswaps the resulting checksum (since
* skein is internally endian-insensitive).
*/
void
abd_checksum_skein_byteswap(abd_t *abd, uint64_t size,
const void *ctx_template, zio_cksum_t *zcp)
{
zio_cksum_t tmp;
abd_checksum_skein_native(abd, size, ctx_template, &tmp);
zcp->zc_word[0] = BSWAP_64(tmp.zc_word[0]);
zcp->zc_word[1] = BSWAP_64(tmp.zc_word[1]);
zcp->zc_word[2] = BSWAP_64(tmp.zc_word[2]);
zcp->zc_word[3] = BSWAP_64(tmp.zc_word[3]);
}
/*
* Allocates a skein MAC template suitable for using in skein MAC checksum
* computations and returns a pointer to it.
*/
void *
abd_checksum_skein_tmpl_init(const zio_cksum_salt_t *salt)
{
Skein_512_Ctxt_t *ctx = kmem_zalloc(sizeof (*ctx), KM_SLEEP);
(void) Skein_512_InitExt(ctx, sizeof (zio_cksum_t) * 8, 0,
salt->zcs_bytes, sizeof (salt->zcs_bytes));
return (ctx);
}
/*
* Frees a skein context template previously allocated using
* zio_checksum_skein_tmpl_init.
*/
void
abd_checksum_skein_tmpl_free(void *ctx_template)
{
Skein_512_Ctxt_t *ctx = ctx_template;
memset(ctx, 0, sizeof (*ctx));
kmem_free(ctx, sizeof (*ctx));
}
|
