module/zfs/sha2_zfs.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 https://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
  22 /*
  23  * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
  24  * Copyright 2013 Saso Kiselkov. All rights reserved.
  25  * Copyright (c) 2016 by Delphix. All rights reserved.
  26  */
  27
  28 #include <sys/zfs_context.h>
  29 #include <sys/zio_checksum.h>
  30 #include <sys/sha2.h>
  31 #include <sys/abd.h>
  32 #include <sys/qat.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 void
  43 abd_checksum_sha256(abd_t *abd, uint64_t size,
  44     const void *ctx_template, zio_cksum_t *zcp)
  45 {
  46         (void) ctx_template;
  47         int ret;
  48         SHA2_CTX ctx;
  49         zio_cksum_t tmp;
  50
  51         if (qat_checksum_use_accel(size)) {
  52                 uint8_t *buf = abd_borrow_buf_copy(abd, size);
  53                 ret = qat_checksum(ZIO_CHECKSUM_SHA256, buf, size, &tmp);
  54                 abd_return_buf(abd, buf, size);
  55                 if (ret == CPA_STATUS_SUCCESS)
  56                         goto bswap;
  57
  58                 /* If the hardware implementation fails fall back to software */
  59         }
  60
  61         SHA2Init(SHA256, &ctx);
  62         (void) abd_iterate_func(abd, 0, size, sha_incremental, &ctx);
  63         SHA2Final(&tmp, &ctx);
  64
  65 bswap:
  66         /*
  67          * A prior implementation of this function had a
  68          * private SHA256 implementation always wrote things out in
  69          * Big Endian and there wasn't a byteswap variant of it.
  70          * To preserve on disk compatibility we need to force that
  71          * behavior.
  72          */
  73         zcp->zc_word[0] = BE_64(tmp.zc_word[0]);
  74         zcp->zc_word[1] = BE_64(tmp.zc_word[1]);
  75         zcp->zc_word[2] = BE_64(tmp.zc_word[2]);
  76         zcp->zc_word[3] = BE_64(tmp.zc_word[3]);
  77 }
  78
  79 void
  80 abd_checksum_sha512_native(abd_t *abd, uint64_t size,
  81     const void *ctx_template, zio_cksum_t *zcp)
  82 {
  83         (void) ctx_template;
  84         SHA2_CTX        ctx;
  85
  86         SHA2Init(SHA512_256, &ctx);
  87         (void) abd_iterate_func(abd, 0, size, sha_incremental, &ctx);
  88         SHA2Final(zcp, &ctx);
  89 }
  90
  91 void
  92 abd_checksum_sha512_byteswap(abd_t *abd, uint64_t size,
  93     const void *ctx_template, zio_cksum_t *zcp)
  94 {
  95         zio_cksum_t     tmp;
  96
  97         abd_checksum_sha512_native(abd, size, ctx_template, &tmp);
  98         zcp->zc_word[0] = BSWAP_64(tmp.zc_word[0]);
  99         zcp->zc_word[1] = BSWAP_64(tmp.zc_word[1]);
 100         zcp->zc_word[2] = BSWAP_64(tmp.zc_word[2]);
 101         zcp->zc_word[3] = BSWAP_64(tmp.zc_word[3]);
 102 }