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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://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 }
     51