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 #include <sys/zfs_context.h>
  26 #include <sys/zio.h>
  27 #include <sys/sha2.h>
  28 
  29 void
  30 zio_checksum_SHA256(const void *buf, uint64_t size, zio_cksum_t *zcp)
  31 {
  32         SHA2_CTX ctx;
  33         zio_cksum_t tmp;
  34 
  35         SHA2Init(SHA256, &ctx);
  36         SHA2Update(&ctx, buf, size);
  37         SHA2Final(&tmp, &ctx);
  38 
  39         /*
  40          * A prior implementation of this function had a
  41          * private SHA256 implementation always wrote things out in
  42          * Big Endian and there wasn't a byteswap variant of it.
  43          * To preseve on disk compatibility we need to force that
  44          * behaviour.
  45          */
  46         zcp->zc_word[0] = BE_64(tmp.zc_word[0]);
  47         zcp->zc_word[1] = BE_64(tmp.zc_word[1]);
  48         zcp->zc_word[2] = BE_64(tmp.zc_word[2]);
  49         zcp->zc_word[3] = BE_64(tmp.zc_word[3]);
  50 }