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
101
102
103
|
/*
* 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.
* Use is subject to license terms.
*/
#include <sys/zfs_context.h>
#include <sys/zio.h>
#include <sys/edonr.h>
#include <sys/zfs_context.h> /* For CTASSERT() */
#define EDONR_MODE 512
#define EDONR_BLOCK_SIZE EdonR512_BLOCK_SIZE
/*
* Native zio_checksum interface for the Edon-R hash function.
*/
/*ARGSUSED*/
void
zio_checksum_edonr_native(const void *buf, uint64_t size,
const void *ctx_template, zio_cksum_t *zcp)
{
uint8_t digest[EDONR_MODE / 8];
EdonRState ctx;
ASSERT(ctx_template != NULL);
bcopy(ctx_template, &ctx, sizeof (ctx));
EdonRUpdate(&ctx, buf, size * 8);
EdonRFinal(&ctx, digest);
bcopy(digest, zcp->zc_word, sizeof (zcp->zc_word));
}
/*
* Byteswapped zio_checksum interface for the Edon-R hash function.
*/
void
zio_checksum_edonr_byteswap(const void *buf, uint64_t size,
const void *ctx_template, zio_cksum_t *zcp)
{
zio_cksum_t tmp;
zio_checksum_edonr_native(buf, size, ctx_template, &tmp);
zcp->zc_word[0] = BSWAP_64(zcp->zc_word[0]);
zcp->zc_word[1] = BSWAP_64(zcp->zc_word[1]);
zcp->zc_word[2] = BSWAP_64(zcp->zc_word[2]);
zcp->zc_word[3] = BSWAP_64(zcp->zc_word[3]);
}
void *
zio_checksum_edonr_tmpl_init(const zio_cksum_salt_t *salt)
{
EdonRState *ctx;
uint8_t salt_block[EDONR_BLOCK_SIZE];
/*
* Edon-R needs all but the last hash invocation to be on full-size
* blocks, but the salt is too small. Rather than simply padding it
* with zeros, we expand the salt into a new salt block of proper
* size by double-hashing it (the new salt block will be composed of
* H(salt) || H(H(salt))).
*/
CTASSERT(EDONR_BLOCK_SIZE == 2 * (EDONR_MODE / 8));
EdonRHash(EDONR_MODE, salt->zcs_bytes, sizeof (salt->zcs_bytes) * 8,
salt_block);
EdonRHash(EDONR_MODE, salt_block, EDONR_MODE, salt_block +
EDONR_MODE / 8);
/*
* Feed the new salt block into the hash function - this will serve
* as our MAC key.
*/
ctx = kmem_zalloc(sizeof (*ctx), KM_SLEEP);
EdonRInit(ctx, EDONR_MODE);
EdonRUpdate(ctx, salt_block, sizeof (salt_block) * 8);
return (ctx);
}
void
zio_checksum_edonr_tmpl_free(void *ctx_template)
{
EdonRState *ctx = ctx_template;
bzero(ctx, sizeof (*ctx));
kmem_free(ctx, sizeof (*ctx));
}
|
