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3c67d83a TH |
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://opensource.org/licenses/CDDL-1.0. | |
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 2013 Saso Kiselkov. All rights reserved. | |
23 | * Use is subject to license terms. | |
24 | */ | |
a6255b7f DQ |
25 | /* |
26 | * Copyright (c) 2016 by Delphix. All rights reserved. | |
27 | */ | |
3c67d83a TH |
28 | #include <sys/zfs_context.h> |
29 | #include <sys/zio.h> | |
60356b1a | 30 | #include <sys/zio_checksum.h> |
3c67d83a | 31 | #include <sys/edonr.h> |
a6255b7f | 32 | #include <sys/abd.h> |
3c67d83a TH |
33 | |
34 | #define EDONR_MODE 512 | |
35 | #define EDONR_BLOCK_SIZE EdonR512_BLOCK_SIZE | |
36 | ||
a6255b7f DQ |
37 | static int |
38 | edonr_incremental(void *buf, size_t size, void *arg) | |
39 | { | |
40 | EdonRState *ctx = arg; | |
41 | EdonRUpdate(ctx, buf, size * 8); | |
42 | return (0); | |
43 | } | |
44 | ||
3c67d83a TH |
45 | /* |
46 | * Native zio_checksum interface for the Edon-R hash function. | |
47 | */ | |
3c67d83a | 48 | void |
a6255b7f | 49 | abd_checksum_edonr_native(abd_t *abd, uint64_t size, |
3c67d83a TH |
50 | const void *ctx_template, zio_cksum_t *zcp) |
51 | { | |
52 | uint8_t digest[EDONR_MODE / 8]; | |
53 | EdonRState ctx; | |
54 | ||
55 | ASSERT(ctx_template != NULL); | |
861166b0 | 56 | memcpy(&ctx, ctx_template, sizeof (ctx)); |
a6255b7f | 57 | (void) abd_iterate_func(abd, 0, size, edonr_incremental, &ctx); |
3c67d83a | 58 | EdonRFinal(&ctx, digest); |
861166b0 | 59 | memcpy(zcp->zc_word, digest, sizeof (zcp->zc_word)); |
3c67d83a TH |
60 | } |
61 | ||
62 | /* | |
63 | * Byteswapped zio_checksum interface for the Edon-R hash function. | |
64 | */ | |
65 | void | |
a6255b7f | 66 | abd_checksum_edonr_byteswap(abd_t *abd, uint64_t size, |
3c67d83a TH |
67 | const void *ctx_template, zio_cksum_t *zcp) |
68 | { | |
69 | zio_cksum_t tmp; | |
70 | ||
a6255b7f | 71 | abd_checksum_edonr_native(abd, size, ctx_template, &tmp); |
3c67d83a TH |
72 | zcp->zc_word[0] = BSWAP_64(zcp->zc_word[0]); |
73 | zcp->zc_word[1] = BSWAP_64(zcp->zc_word[1]); | |
74 | zcp->zc_word[2] = BSWAP_64(zcp->zc_word[2]); | |
75 | zcp->zc_word[3] = BSWAP_64(zcp->zc_word[3]); | |
76 | } | |
77 | ||
78 | void * | |
a6255b7f | 79 | abd_checksum_edonr_tmpl_init(const zio_cksum_salt_t *salt) |
3c67d83a TH |
80 | { |
81 | EdonRState *ctx; | |
82 | uint8_t salt_block[EDONR_BLOCK_SIZE]; | |
83 | ||
84 | /* | |
85 | * Edon-R needs all but the last hash invocation to be on full-size | |
86 | * blocks, but the salt is too small. Rather than simply padding it | |
87 | * with zeros, we expand the salt into a new salt block of proper | |
88 | * size by double-hashing it (the new salt block will be composed of | |
89 | * H(salt) || H(H(salt))). | |
90 | */ | |
c70bb2f6 AZ |
91 | _Static_assert(EDONR_BLOCK_SIZE == 2 * (EDONR_MODE / 8), |
92 | "Edon-R block size mismatch"); | |
3c67d83a TH |
93 | EdonRHash(EDONR_MODE, salt->zcs_bytes, sizeof (salt->zcs_bytes) * 8, |
94 | salt_block); | |
95 | EdonRHash(EDONR_MODE, salt_block, EDONR_MODE, salt_block + | |
96 | EDONR_MODE / 8); | |
97 | ||
98 | /* | |
99 | * Feed the new salt block into the hash function - this will serve | |
100 | * as our MAC key. | |
101 | */ | |
102 | ctx = kmem_zalloc(sizeof (*ctx), KM_SLEEP); | |
103 | EdonRInit(ctx, EDONR_MODE); | |
104 | EdonRUpdate(ctx, salt_block, sizeof (salt_block) * 8); | |
105 | return (ctx); | |
106 | } | |
107 | ||
108 | void | |
a6255b7f | 109 | abd_checksum_edonr_tmpl_free(void *ctx_template) |
3c67d83a | 110 | { |
861166b0 | 111 | EdonRState *ctx = ctx_template; |
3c67d83a | 112 | |
861166b0 | 113 | memset(ctx, 0, sizeof (*ctx)); |
3c67d83a TH |
114 | kmem_free(ctx, sizeof (*ctx)); |
115 | } |