92 lines
2.7 KiB
C
92 lines
2.7 KiB
C
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/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://opensource.org/licenses/CDDL-1.0.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright 2013 Saso Kiselkov. All rights reserved.
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*/
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#include <sys/zfs_context.h>
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#include <sys/zio.h>
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#include <sys/skein.h>
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/*
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* Computes a native 256-bit skein MAC checksum. Please note that this
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* function requires the presence of a ctx_template that should be allocated
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* using zio_checksum_skein_tmpl_init.
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*/
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/*ARGSUSED*/
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void
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zio_checksum_skein_native(const void *buf, uint64_t size,
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const void *ctx_template, zio_cksum_t *zcp)
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{
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Skein_512_Ctxt_t ctx;
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ASSERT(ctx_template != NULL);
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bcopy(ctx_template, &ctx, sizeof (ctx));
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(void) Skein_512_Update(&ctx, buf, size);
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(void) Skein_512_Final(&ctx, (uint8_t *)zcp);
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bzero(&ctx, sizeof (ctx));
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}
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/*
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* Byteswapped version of zio_checksum_skein_native. This just invokes
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* the native checksum function and byteswaps the resulting checksum (since
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* skein is internally endian-insensitive).
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*/
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void
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zio_checksum_skein_byteswap(const void *buf, uint64_t size,
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const void *ctx_template, zio_cksum_t *zcp)
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{
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zio_cksum_t tmp;
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zio_checksum_skein_native(buf, size, ctx_template, &tmp);
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zcp->zc_word[0] = BSWAP_64(tmp.zc_word[0]);
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zcp->zc_word[1] = BSWAP_64(tmp.zc_word[1]);
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zcp->zc_word[2] = BSWAP_64(tmp.zc_word[2]);
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zcp->zc_word[3] = BSWAP_64(tmp.zc_word[3]);
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}
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/*
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* Allocates a skein MAC template suitable for using in skein MAC checksum
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* computations and returns a pointer to it.
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*/
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void *
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zio_checksum_skein_tmpl_init(const zio_cksum_salt_t *salt)
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{
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Skein_512_Ctxt_t *ctx;
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ctx = kmem_zalloc(sizeof (*ctx), KM_SLEEP);
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(void) Skein_512_InitExt(ctx, sizeof (zio_cksum_t) * 8, 0,
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salt->zcs_bytes, sizeof (salt->zcs_bytes));
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return (ctx);
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}
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/*
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* Frees a skein context template previously allocated using
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* zio_checksum_skein_tmpl_init.
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*/
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void
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zio_checksum_skein_tmpl_free(void *ctx_template)
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{
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Skein_512_Ctxt_t *ctx = ctx_template;
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bzero(ctx, sizeof (*ctx));
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kmem_free(ctx, sizeof (*ctx));
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}
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