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 #include <sys/edonr.h>
26
27 #define EDONR_MODE 512
28 #define EDONR_BLOCK_SIZE EdonR512_BLOCK_SIZE
29
30 /*
31 * Native zio_checksum interface for the Edon-R hash function.
32 */
33 /*ARGSUSED*/
34 static void
zio_checksum_edonr_native(const void * buf,uint64_t size,const void * ctx_template,zio_cksum_t * zcp)35 zio_checksum_edonr_native(const void *buf, uint64_t size,
36 const void *ctx_template, zio_cksum_t *zcp)
37 {
38 uint8_t digest[EDONR_MODE / 8];
39 EdonRState ctx;
40
41 ASSERT(ctx_template != NULL);
42 bcopy(ctx_template, &ctx, sizeof (ctx));
43 EdonRUpdate(&ctx, buf, size * 8);
44 EdonRFinal(&ctx, digest);
45 bcopy(digest, zcp->zc_word, sizeof (zcp->zc_word));
46 }
47
48 /*
49 * Byteswapped zio_checksum interface for the Edon-R hash function.
50 */
51 static void
zio_checksum_edonr_byteswap(const void * buf,uint64_t size,const void * ctx_template,zio_cksum_t * zcp)52 zio_checksum_edonr_byteswap(const void *buf, uint64_t size,
53 const void *ctx_template, zio_cksum_t *zcp)
54 {
55 zio_cksum_t tmp;
56
57 zio_checksum_edonr_native(buf, size, ctx_template, &tmp);
58 zcp->zc_word[0] = BSWAP_64(zcp->zc_word[0]);
59 zcp->zc_word[1] = BSWAP_64(zcp->zc_word[1]);
60 zcp->zc_word[2] = BSWAP_64(zcp->zc_word[2]);
61 zcp->zc_word[3] = BSWAP_64(zcp->zc_word[3]);
62 }
63
64 static void *
zio_checksum_edonr_tmpl_init(const zio_cksum_salt_t * salt)65 zio_checksum_edonr_tmpl_init(const zio_cksum_salt_t *salt)
66 {
67 EdonRState *ctx;
68 uint8_t salt_block[EDONR_BLOCK_SIZE];
69
70 /*
71 * Edon-R needs all but the last hash invocation to be on full-size
72 * blocks, but the salt is too small. Rather than simply padding it
73 * with zeros, we expand the salt into a new salt block of proper
74 * size by double-hashing it (the new salt block will be composed of
75 * H(salt) || H(H(salt))).
76 */
77 EdonRHash(EDONR_MODE, salt->zcs_bytes, sizeof (salt->zcs_bytes) * 8,
78 salt_block);
79 EdonRHash(EDONR_MODE, salt_block, EDONR_MODE, salt_block +
80 EDONR_MODE / 8);
81
82 /*
83 * Feed the new salt block into the hash function - this will serve
84 * as our MAC key.
85 */
86 ctx = malloc(sizeof (*ctx));
87 bzero(ctx, sizeof (*ctx));
88 EdonRInit(ctx, EDONR_MODE);
89 EdonRUpdate(ctx, salt_block, sizeof (salt_block) * 8);
90 return (ctx);
91 }
92
93 static void
zio_checksum_edonr_tmpl_free(void * ctx_template)94 zio_checksum_edonr_tmpl_free(void *ctx_template)
95 {
96 EdonRState *ctx = ctx_template;
97
98 bzero(ctx, sizeof (*ctx));
99 free(ctx);
100 }
101