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 */
25 /*
26 * Copyright (c) 2016 by Delphix. All rights reserved.
27 */
28 #include <sys/zfs_context.h>
29 #include <sys/zio.h>
30 #include <sys/edonr.h>
31 #include <sys/abd.h>
32
33 #define EDONR_MODE 512
34 #define EDONR_BLOCK_SIZE EdonR512_BLOCK_SIZE
35
36 static int
edonr_incremental(void * buf,size_t size,void * arg)37 edonr_incremental(void *buf, size_t size, void *arg)
38 {
39 EdonRState *ctx = arg;
40 EdonRUpdate(ctx, buf, size * 8);
41 return (0);
42 }
43
44 /*
45 * Native zio_checksum interface for the Edon-R hash function.
46 */
47 /*ARGSUSED*/
48 void
abd_checksum_edonr_native(abd_t * abd,uint64_t size,const void * ctx_template,zio_cksum_t * zcp)49 abd_checksum_edonr_native(abd_t *abd, uint64_t size,
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);
56 bcopy(ctx_template, &ctx, sizeof (ctx));
57 (void) abd_iterate_func(abd, 0, size, edonr_incremental, &ctx);
58 EdonRFinal(&ctx, digest);
59 bcopy(digest, zcp->zc_word, sizeof (zcp->zc_word));
60 }
61
62 /*
63 * Byteswapped zio_checksum interface for the Edon-R hash function.
64 */
65 void
abd_checksum_edonr_byteswap(abd_t * abd,uint64_t size,const void * ctx_template,zio_cksum_t * zcp)66 abd_checksum_edonr_byteswap(abd_t *abd, uint64_t size,
67 const void *ctx_template, zio_cksum_t *zcp)
68 {
69 zio_cksum_t tmp;
70
71 abd_checksum_edonr_native(abd, size, ctx_template, &tmp);
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 *
abd_checksum_edonr_tmpl_init(const zio_cksum_salt_t * salt)79 abd_checksum_edonr_tmpl_init(const zio_cksum_salt_t *salt)
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 */
91 CTASSERT(EDONR_BLOCK_SIZE == 2 * (EDONR_MODE / 8));
92 EdonRHash(EDONR_MODE, salt->zcs_bytes, sizeof (salt->zcs_bytes) * 8,
93 salt_block);
94 EdonRHash(EDONR_MODE, salt_block, EDONR_MODE, salt_block +
95 EDONR_MODE / 8);
96
97 /*
98 * Feed the new salt block into the hash function - this will serve
99 * as our MAC key.
100 */
101 ctx = kmem_zalloc(sizeof (*ctx), KM_SLEEP);
102 EdonRInit(ctx, EDONR_MODE);
103 EdonRUpdate(ctx, salt_block, sizeof (salt_block) * 8);
104 return (ctx);
105 }
106
107 void
abd_checksum_edonr_tmpl_free(void * ctx_template)108 abd_checksum_edonr_tmpl_free(void *ctx_template)
109 {
110 EdonRState *ctx = ctx_template;
111
112 bzero(ctx, sizeof (*ctx));
113 kmem_free(ctx, sizeof (*ctx));
114 }
115