kernel/fs/zfs/sha256.c

   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://www.opensolaris.org/os/licensing.
  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 2009 Sun Microsystems, Inc.  All rights reserved.
  23  * Use is subject to license terms.
  24  */
  25 /*
  26  * Copyright 2013 Saso Kiselkov. All rights reserved.
  27  * Copyright (c) 2016 by Delphix. All rights reserved.
  28  */
  29 #include <sys/zfs_context.h>
  30 #include <sys/zio.h>
  31 #include <sys/sha2.h>
  32 #include <sys/abd.h>
  33
  34 static int
  35 sha_incremental(void *buf, size_t size, void *arg)
  36 {
  37         SHA2_CTX *ctx = arg;
  38         SHA2Update(ctx, buf, size);
  39         return (0);
  40 }
  41
  42 /*ARGSUSED*/
  43 void
  44 abd_checksum_SHA256(abd_t *abd, uint64_t size,
  45     const void *ctx_template, zio_cksum_t *zcp)
  46 {
  47         SHA2_CTX ctx;
  48         zio_cksum_t tmp;
  49
  50         SHA2Init(SHA256, &ctx);
  51         (void) abd_iterate_func(abd, 0, size, sha_incremental, &ctx);
  52         SHA2Final(&tmp, &ctx);
  53
  54         /*
  55          * A prior implementation of this function had a
  56          * private SHA256 implementation always wrote things out in
  57          * Big Endian and there wasn't a byteswap variant of it.
  58          * To preserve on disk compatibility we need to force that
  59          * behavior.
  60          */
  61         zcp->zc_word[0] = BE_64(tmp.zc_word[0]);
  62         zcp->zc_word[1] = BE_64(tmp.zc_word[1]);
  63         zcp->zc_word[2] = BE_64(tmp.zc_word[2]);
  64         zcp->zc_word[3] = BE_64(tmp.zc_word[3]);
  65 }
  66
  67 /*ARGSUSED*/
  68 void
  69 abd_checksum_SHA512_native(abd_t *abd, uint64_t size,
  70     const void *ctx_template, zio_cksum_t *zcp)
  71 {
  72         SHA2_CTX        ctx;
  73
  74         SHA2Init(SHA512_256, &ctx);
  75         (void) abd_iterate_func(abd, 0, size, sha_incremental, &ctx);
  76         SHA2Final(zcp, &ctx);
  77 }
  78
  79 /*ARGSUSED*/
  80 void
  81 abd_checksum_SHA512_byteswap(abd_t *abd, uint64_t size,
  82     const void *ctx_template, zio_cksum_t *zcp)
  83 {
  84         zio_cksum_t     tmp;
  85
  86         abd_checksum_SHA512_native(abd, size, ctx_template, &tmp);
  87         zcp->zc_word[0] = BSWAP_64(tmp.zc_word[0]);
  88         zcp->zc_word[1] = BSWAP_64(tmp.zc_word[1]);
  89         zcp->zc_word[2] = BSWAP_64(tmp.zc_word[2]);
  90         zcp->zc_word[3] = BSWAP_64(tmp.zc_word[3]);
  91 }