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.
24 #include <sys/zfs_context.h>
27 #include <crypto/skein/skein.h>
33 * Computes a native 256-bit skein MAC checksum. Please note that this
34 * function requires the presence of a ctx_template that should be allocated
35 * using zio_checksum_skein_tmpl_init.
39 zio_checksum_skein_native(const void *buf, uint64_t size,
40 const void *ctx_template, zio_cksum_t *zcp)
44 ASSERT(ctx_template != NULL);
45 bcopy(ctx_template, &ctx, sizeof (ctx));
46 (void) Skein_512_Update(&ctx, buf, size);
47 (void) Skein_512_Final(&ctx, (uint8_t *)zcp);
48 bzero(&ctx, sizeof (ctx));
52 * Byteswapped version of zio_checksum_skein_native. This just invokes
53 * the native checksum function and byteswaps the resulting checksum (since
54 * skein is internally endian-insensitive).
57 zio_checksum_skein_byteswap(const void *buf, uint64_t size,
58 const void *ctx_template, zio_cksum_t *zcp)
62 zio_checksum_skein_native(buf, size, ctx_template, &tmp);
63 zcp->zc_word[0] = BSWAP_64(tmp.zc_word[0]);
64 zcp->zc_word[1] = BSWAP_64(tmp.zc_word[1]);
65 zcp->zc_word[2] = BSWAP_64(tmp.zc_word[2]);
66 zcp->zc_word[3] = BSWAP_64(tmp.zc_word[3]);
70 * Allocates a skein MAC template suitable for using in skein MAC checksum
71 * computations and returns a pointer to it.
74 zio_checksum_skein_tmpl_init(const zio_cksum_salt_t *salt)
76 Skein_512_Ctxt_t *ctx;
78 ctx = kmem_zalloc(sizeof (*ctx), KM_SLEEP);
79 (void) Skein_512_InitExt(ctx, sizeof (zio_cksum_t) * 8, 0,
80 salt->zcs_bytes, sizeof (salt->zcs_bytes));
85 * Frees a skein context template previously allocated using
86 * zio_checksum_skein_tmpl_init.
89 zio_checksum_skein_tmpl_free(void *ctx_template)
91 Skein_512_Ctxt_t *ctx = ctx_template;
93 bzero(ctx, sizeof (*ctx));
94 kmem_free(ctx, sizeof (*ctx));