edonr_zfs.c

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    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 /*
   26  * Copyright (c) 2016 by Delphix. All rights reserved.
   27  */
   28 #include <sys/zfs_context.h>
   29 #include <sys/zio.h>
   30 #include <sys/zio_checksum.h>
   31 #include <sys/edonr.h>
   32 #include <sys/abd.h>
   33 
   34 #define EDONR_MODE              512
   35 #define EDONR_BLOCK_SIZE        EdonR512_BLOCK_SIZE
   36 
   37 static int
   38 edonr_incremental(void *buf, size_t size, void *arg)
   39 {
   40         EdonRState *ctx = arg;
   41         EdonRUpdate(ctx, buf, size * 8);
   42         return (0);
   43 }
   44 
   45 /*
   46  * Native zio_checksum interface for the Edon-R hash function.
   47  */
   48 void
   49 abd_checksum_edonr_native(abd_t *abd, uint64_t size,
   50     const void *ctx_template, zio_cksum_t *zcp)
   51 {
   52         uint8_t         digest[EDONR_MODE / 8];
   53         EdonRState      ctx;
   54 
   55         ASSERT(ctx_template != NULL);
   56         memcpy(&ctx, ctx_template, sizeof (ctx));
   57         (void) abd_iterate_func(abd, 0, size, edonr_incremental, &ctx);
   58         EdonRFinal(&ctx, digest);
   59         memcpy(zcp->zc_word, digest, sizeof (zcp->zc_word));
   60 }
   61 
   62 /*
   63  * Byteswapped zio_checksum interface for the Edon-R hash function.
   64  */
   65 void
   66 abd_checksum_edonr_byteswap(abd_t *abd, uint64_t size,
   67     const void *ctx_template, zio_cksum_t *zcp)
   68 {
   69         zio_cksum_t     tmp;
   70 
   71         abd_checksum_edonr_native(abd, size, ctx_template, &tmp);
   72         zcp->zc_word[0] = BSWAP_64(zcp->zc_word[0]);
   73         zcp->zc_word[1] = BSWAP_64(zcp->zc_word[1]);
   74         zcp->zc_word[2] = BSWAP_64(zcp->zc_word[2]);
   75         zcp->zc_word[3] = BSWAP_64(zcp->zc_word[3]);
   76 }
   77 
   78 void *
   79 abd_checksum_edonr_tmpl_init(const zio_cksum_salt_t *salt)
   80 {
   81         EdonRState      *ctx;
   82         uint8_t         salt_block[EDONR_BLOCK_SIZE];
   83 
   84         /*
   85          * Edon-R needs all but the last hash invocation to be on full-size
   86          * blocks, but the salt is too small. Rather than simply padding it
   87          * with zeros, we expand the salt into a new salt block of proper
   88          * size by double-hashing it (the new salt block will be composed of
   89          * H(salt) || H(H(salt))).
   90          */
   91         _Static_assert(EDONR_BLOCK_SIZE == 2 * (EDONR_MODE / 8),
   92             "Edon-R block size mismatch");
   93         EdonRHash(EDONR_MODE, salt->zcs_bytes, sizeof (salt->zcs_bytes) * 8,
   94             salt_block);
   95         EdonRHash(EDONR_MODE, salt_block, EDONR_MODE, salt_block +
   96             EDONR_MODE / 8);
   97 
   98         /*
   99          * Feed the new salt block into the hash function - this will serve
  100          * as our MAC key.
  101          */
  102         ctx = kmem_zalloc(sizeof (*ctx), KM_SLEEP);
  103         EdonRInit(ctx, EDONR_MODE);
  104         EdonRUpdate(ctx, salt_block, sizeof (salt_block) * 8);
  105         return (ctx);
  106 }
  107 
  108 void
  109 abd_checksum_edonr_tmpl_free(void *ctx_template)
  110 {
  111         EdonRState *ctx = ctx_template;
  112 
  113         memset(ctx, 0, sizeof (*ctx));
  114         kmem_free(ctx, sizeof (*ctx));
  115 }

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FreeBSD/Linux Kernel Cross Reference sys/contrib/openzfs/module/zfs/edonr_zfs.c

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sys/contrib/openzfs/module/zfs/edonr_zfs.c