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  */
  28 #include <sys/zfs_context.h>
  29 #include <sys/zio.h>
  30 #include <sys/sha2.h>
  31 
  32 /*ARGSUSED*/
  33 void
  34 zio_checksum_SHA256(const void *buf, uint64_t size,
  35     const zio_cksum_salt_t *salt, const void *ctx_template, zio_cksum_t *zcp)
  36 {
  37         SHA2_CTX ctx;
  38         zio_cksum_t tmp;
  39 
  40         SHA2Init(SHA256, &ctx);
  41         SHA2Update(&ctx, buf, size);
  42         SHA2Final(&tmp, &ctx);
  43 
  44         /*
  45          * A prior implementation of this function had a
  46          * private SHA256 implementation always wrote things out in
  47          * Big Endian and there wasn't a byteswap variant of it.
  48          * To preseve on disk compatibility we need to force that
  49          * behaviour.
  50          */
  51         zcp->zc_word[0] = BE_64(tmp.zc_word[0]);
  52         zcp->zc_word[1] = BE_64(tmp.zc_word[1]);
  53         zcp->zc_word[2] = BE_64(tmp.zc_word[2]);
  54         zcp->zc_word[3] = BE_64(tmp.zc_word[3]);
  55 }
  56 
  57 /*ARGSUSED*/
  58 void
  59 zio_checksum_SHA512_native(const void *buf, uint64_t size,
  60     const zio_cksum_salt_t *salt, const void *ctx_template, zio_cksum_t *zcp)
  61 {
  62         SHA2_CTX        ctx;
  63 
  64         SHA2Init(SHA512_256, &ctx);
  65         SHA2Update(&ctx, buf, size);
  66         SHA2Final(zcp, &ctx);
  67 }
  68 
  69 /*ARGSUSED*/
  70 void
  71 zio_checksum_SHA512_byteswap(const void *buf, uint64_t size,
  72     const zio_cksum_salt_t *salt, const void *ctx_template, zio_cksum_t *zcp)
  73 {
  74         zio_cksum_t     tmp;
  75 
  76         zio_checksum_SHA512_native(buf, size, salt, ctx_template, &tmp);
  77         zcp->zc_word[0] = BSWAP_64(tmp.zc_word[0]);
  78         zcp->zc_word[1] = BSWAP_64(tmp.zc_word[1]);
  79         zcp->zc_word[2] = BSWAP_64(tmp.zc_word[2]);
  80         zcp->zc_word[3] = BSWAP_64(tmp.zc_word[3]);
  81 }