sha256.c

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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 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  * 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/zio_checksum.h>
   32 #include <sys/sha2.h>
   33 #include <sys/abd.h>
   34 #include <sys/qat.h>
   35 
   36 static int
   37 sha_incremental(void *buf, size_t size, void *arg)
   38 {
   39         SHA2_CTX *ctx = arg;
   40         SHA2Update(ctx, buf, size);
   41         return (0);
   42 }
   43 
   44 void
   45 abd_checksum_SHA256(abd_t *abd, uint64_t size,
   46     const void *ctx_template, zio_cksum_t *zcp)
   47 {
   48         (void) ctx_template;
   49         int ret;
   50         SHA2_CTX ctx;
   51         zio_cksum_t tmp;
   52 
   53         if (qat_checksum_use_accel(size)) {
   54                 uint8_t *buf = abd_borrow_buf_copy(abd, size);
   55                 ret = qat_checksum(ZIO_CHECKSUM_SHA256, buf, size, &tmp);
   56                 abd_return_buf(abd, buf, size);
   57                 if (ret == CPA_STATUS_SUCCESS)
   58                         goto bswap;
   59 
   60                 /* If the hardware implementation fails fall back to software */
   61         }
   62 
   63         SHA2Init(SHA256, &ctx);
   64         (void) abd_iterate_func(abd, 0, size, sha_incremental, &ctx);
   65         SHA2Final(&tmp, &ctx);
   66 
   67 bswap:
   68         /*
   69          * A prior implementation of this function had a
   70          * private SHA256 implementation always wrote things out in
   71          * Big Endian and there wasn't a byteswap variant of it.
   72          * To preserve on disk compatibility we need to force that
   73          * behavior.
   74          */
   75         zcp->zc_word[0] = BE_64(tmp.zc_word[0]);
   76         zcp->zc_word[1] = BE_64(tmp.zc_word[1]);
   77         zcp->zc_word[2] = BE_64(tmp.zc_word[2]);
   78         zcp->zc_word[3] = BE_64(tmp.zc_word[3]);
   79 }
   80 
   81 void
   82 abd_checksum_SHA512_native(abd_t *abd, uint64_t size,
   83     const void *ctx_template, zio_cksum_t *zcp)
   84 {
   85         (void) ctx_template;
   86         SHA2_CTX        ctx;
   87 
   88         SHA2Init(SHA512_256, &ctx);
   89         (void) abd_iterate_func(abd, 0, size, sha_incremental, &ctx);
   90         SHA2Final(zcp, &ctx);
   91 }
   92 
   93 void
   94 abd_checksum_SHA512_byteswap(abd_t *abd, uint64_t size,
   95     const void *ctx_template, zio_cksum_t *zcp)
   96 {
   97         zio_cksum_t     tmp;
   98 
   99         abd_checksum_SHA512_native(abd, size, ctx_template, &tmp);
  100         zcp->zc_word[0] = BSWAP_64(tmp.zc_word[0]);
  101         zcp->zc_word[1] = BSWAP_64(tmp.zc_word[1]);
  102         zcp->zc_word[2] = BSWAP_64(tmp.zc_word[2]);
  103         zcp->zc_word[3] = BSWAP_64(tmp.zc_word[3]);
  104 }

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FreeBSD/Linux Kernel Cross Reference sys/contrib/openzfs/module/zfs/sha256.c

FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/module/zfs/sha256.c