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.
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.
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]
22 * Copyright 2013 Saso Kiselkov. All rights reserved.
23 * Copyright (c) 2016 by Delphix. All rights reserved.
25 #include <sys/zfs_context.h>
28 #include <crypto/skein/skein.h>
35 skein_incremental(void *buf, size_t size, void *arg)
37 Skein_512_Ctxt_t *ctx = arg;
38 (void) Skein_512_Update(ctx, buf, size);
43 * Computes a native 256-bit skein MAC checksum. Please note that this
44 * function requires the presence of a ctx_template that should be allocated
45 * using abd_checksum_skein_tmpl_init.
49 abd_checksum_skein_native(abd_t *abd, uint64_t size,
50 const void *ctx_template, zio_cksum_t *zcp)
54 ASSERT(ctx_template != NULL);
55 bcopy(ctx_template, &ctx, sizeof (ctx));
56 (void) abd_iterate_func(abd, 0, size, skein_incremental, &ctx);
57 (void) Skein_512_Final(&ctx, (uint8_t *)zcp);
58 bzero(&ctx, sizeof (ctx));
62 * Byteswapped version of abd_checksum_skein_native. This just invokes
63 * the native checksum function and byteswaps the resulting checksum (since
64 * skein is internally endian-insensitive).
67 abd_checksum_skein_byteswap(abd_t *abd, uint64_t size,
68 const void *ctx_template, zio_cksum_t *zcp)
72 abd_checksum_skein_native(abd, size, ctx_template, &tmp);
73 zcp->zc_word[0] = BSWAP_64(tmp.zc_word[0]);
74 zcp->zc_word[1] = BSWAP_64(tmp.zc_word[1]);
75 zcp->zc_word[2] = BSWAP_64(tmp.zc_word[2]);
76 zcp->zc_word[3] = BSWAP_64(tmp.zc_word[3]);
80 * Allocates a skein MAC template suitable for using in skein MAC checksum
81 * computations and returns a pointer to it.
84 abd_checksum_skein_tmpl_init(const zio_cksum_salt_t *salt)
86 Skein_512_Ctxt_t *ctx;
88 ctx = kmem_zalloc(sizeof (*ctx), KM_SLEEP);
89 (void) Skein_512_InitExt(ctx, sizeof (zio_cksum_t) * 8, 0,
90 salt->zcs_bytes, sizeof (salt->zcs_bytes));
95 * Frees a skein context template previously allocated using
96 * abd_checksum_skein_tmpl_init.
99 abd_checksum_skein_tmpl_free(void *ctx_template)
101 Skein_512_Ctxt_t *ctx = ctx_template;
103 bzero(ctx, sizeof (*ctx));
104 kmem_free(ctx, sizeof (*ctx));