115 lines
3.2 KiB
C
115 lines
3.2 KiB
C
/*
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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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* Use is subject to license terms.
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*/
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/*
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* Copyright (c) 2016 by Delphix. 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/zio_checksum.h>
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#include <sys/edonr.h>
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#include <sys/abd.h>
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#define EDONR_MODE 512
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#define EDONR_BLOCK_SIZE EdonR512_BLOCK_SIZE
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static int
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edonr_incremental(void *buf, size_t size, void *arg)
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{
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EdonRState *ctx = arg;
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EdonRUpdate(ctx, buf, size * 8);
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return (0);
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}
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/*
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* Native zio_checksum interface for the Edon-R hash function.
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*/
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/*ARGSUSED*/
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void
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abd_checksum_edonr_native(abd_t *abd, uint64_t size,
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const void *ctx_template, zio_cksum_t *zcp)
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{
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uint8_t digest[EDONR_MODE / 8];
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EdonRState ctx;
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ASSERT(ctx_template != NULL);
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bcopy(ctx_template, &ctx, sizeof (ctx));
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(void) abd_iterate_func(abd, 0, size, edonr_incremental, &ctx);
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EdonRFinal(&ctx, digest);
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bcopy(digest, zcp->zc_word, sizeof (zcp->zc_word));
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}
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/*
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* Byteswapped zio_checksum interface for the Edon-R hash function.
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*/
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void
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abd_checksum_edonr_byteswap(abd_t *abd, 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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abd_checksum_edonr_native(abd, size, ctx_template, &tmp);
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zcp->zc_word[0] = BSWAP_64(zcp->zc_word[0]);
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zcp->zc_word[1] = BSWAP_64(zcp->zc_word[1]);
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zcp->zc_word[2] = BSWAP_64(zcp->zc_word[2]);
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zcp->zc_word[3] = BSWAP_64(zcp->zc_word[3]);
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}
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void *
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abd_checksum_edonr_tmpl_init(const zio_cksum_salt_t *salt)
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{
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EdonRState *ctx;
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uint8_t salt_block[EDONR_BLOCK_SIZE];
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/*
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* Edon-R needs all but the last hash invocation to be on full-size
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* blocks, but the salt is too small. Rather than simply padding it
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* with zeros, we expand the salt into a new salt block of proper
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* size by double-hashing it (the new salt block will be composed of
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* H(salt) || H(H(salt))).
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*/
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CTASSERT(EDONR_BLOCK_SIZE == 2 * (EDONR_MODE / 8));
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EdonRHash(EDONR_MODE, salt->zcs_bytes, sizeof (salt->zcs_bytes) * 8,
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salt_block);
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EdonRHash(EDONR_MODE, salt_block, EDONR_MODE, salt_block +
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EDONR_MODE / 8);
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/*
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* Feed the new salt block into the hash function - this will serve
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* as our MAC key.
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*/
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ctx = kmem_zalloc(sizeof (*ctx), KM_SLEEP);
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EdonRInit(ctx, EDONR_MODE);
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EdonRUpdate(ctx, salt_block, sizeof (salt_block) * 8);
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return (ctx);
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}
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void
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abd_checksum_edonr_tmpl_free(void *ctx_template)
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{
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EdonRState *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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