skein_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  * $FreeBSD$
   22  */
   23 /*
   24  * Copyright 2013 Saso Kiselkov.  All rights reserved.
   25  */
   26 #include <skein.h>
   27 
   28 /*
   29  * Computes a native 256-bit skein MAC checksum. Please note that this
   30  * function requires the presence of a ctx_template that should be allocated
   31  * using zio_checksum_skein_tmpl_init.
   32  */
   33 /*ARGSUSED*/
   34 static void
   35 zio_checksum_skein_native(const void *buf, uint64_t size,
   36     const void *ctx_template, zio_cksum_t *zcp)
   37 {
   38         Skein_512_Ctxt_t        ctx;
   39 
   40         ASSERT(ctx_template != NULL);
   41         bcopy(ctx_template, &ctx, sizeof (ctx));
   42         (void) Skein_512_Update(&ctx, buf, size);
   43         (void) Skein_512_Final(&ctx, (uint8_t *)zcp);
   44         bzero(&ctx, sizeof (ctx));
   45 }
   46 
   47 /*
   48  * Byteswapped version of zio_checksum_skein_native. This just invokes
   49  * the native checksum function and byteswaps the resulting checksum (since
   50  * skein is internally endian-insensitive).
   51  */
   52 static void
   53 zio_checksum_skein_byteswap(const void *buf, uint64_t size,
   54     const void *ctx_template, zio_cksum_t *zcp)
   55 {
   56         zio_cksum_t     tmp;
   57 
   58         zio_checksum_skein_native(buf, size, ctx_template, &tmp);
   59         zcp->zc_word[0] = BSWAP_64(tmp.zc_word[0]);
   60         zcp->zc_word[1] = BSWAP_64(tmp.zc_word[1]);
   61         zcp->zc_word[2] = BSWAP_64(tmp.zc_word[2]);
   62         zcp->zc_word[3] = BSWAP_64(tmp.zc_word[3]);
   63 }
   64 
   65 /*
   66  * Allocates a skein MAC template suitable for using in skein MAC checksum
   67  * computations and returns a pointer to it.
   68  */
   69 static void *
   70 zio_checksum_skein_tmpl_init(const zio_cksum_salt_t *salt)
   71 {
   72         Skein_512_Ctxt_t        *ctx;
   73 
   74         ctx = malloc(sizeof (*ctx));
   75         bzero(ctx, sizeof (*ctx));
   76         (void) Skein_512_InitExt(ctx, sizeof (zio_cksum_t) * 8, 0,
   77             salt->zcs_bytes, sizeof (salt->zcs_bytes));
   78         return (ctx);
   79 }
   80 
   81 /*
   82  * Frees a skein context template previously allocated using
   83  * zio_checksum_skein_tmpl_init.
   84  */
   85 static void
   86 zio_checksum_skein_tmpl_free(void *ctx_template)
   87 {
   88         Skein_512_Ctxt_t        *ctx = ctx_template;
   89 
   90         bzero(ctx, sizeof (*ctx));
   91         free(ctx);
   92 }

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FreeBSD/Linux Kernel Cross Reference sys/cddl/boot/zfs/skein_zfs.c

FreeBSD/Linux Kernel Cross Reference
sys/cddl/boot/zfs/skein_zfs.c