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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 /*
     26  * Copyright 2013 Saso Kiselkov. All rights reserved.
     27  */
     28 #include <sys/zfs_context.h>
     29 #include <sys/zio.h>
     30 #ifdef __FreeBSD__
     31 #ifdef _KERNEL
     32 #include <crypto/sha2/sha256.h>
     33 #include <crypto/sha2/sha512t.h>
     34 #else
     35 #include <sha256.h>
     36 #include <sha512t.h>
     37 #endif
     38 #else
     39 #include <sys/sha2.h>
     40 #endif
     41 
     42 /*ARGSUSED*/
     43 void
     44 zio_checksum_SHA256(const void *buf, uint64_t size,
     45     const void *ctx_template, zio_cksum_t *zcp)
     46 {
     47 	SHA256_CTX ctx;
     48 	zio_cksum_t tmp;
     49 
     50 	SHA256_Init(&ctx);
     51 	SHA256_Update(&ctx, buf, size);
     52 	SHA256_Final((unsigned char *)&tmp, &ctx);
     53 
     54 	/*
     55 	 * A prior implementation of this function had a
     56 	 * private SHA256 implementation always wrote things out in
     57 	 * Big Endian and there wasn't a byteswap variant of it.
     58 	 * To preseve on disk compatibility we need to force that
     59 	 * behaviour.
     60 	 */
     61 	zcp->zc_word[0] = BE_64(tmp.zc_word[0]);
     62 	zcp->zc_word[1] = BE_64(tmp.zc_word[1]);
     63 	zcp->zc_word[2] = BE_64(tmp.zc_word[2]);
     64 	zcp->zc_word[3] = BE_64(tmp.zc_word[3]);
     65 }
     66 
     67 #ifndef __NetBSD__
     68 /*ARGSUSED*/
     69 void
     70 zio_checksum_SHA512_native(const void *buf, uint64_t size,
     71     const void *ctx_template, zio_cksum_t *zcp)
     72 {
     73 	SHA512_CTX	ctx;
     74 
     75 	SHA512_256_Init(&ctx);
     76 	SHA512_256_Update(&ctx, buf, size);
     77 	SHA512_256_Final((unsigned char *)zcp, &ctx);
     78 }
     79 
     80 /*ARGSUSED*/
     81 void
     82 zio_checksum_SHA512_byteswap(const void *buf, uint64_t size,
     83     const void *ctx_template, zio_cksum_t *zcp)
     84 {
     85 	zio_cksum_t	tmp;
     86 
     87 	zio_checksum_SHA512_native(buf, size, ctx_template, &tmp);
     88 	zcp->zc_word[0] = BSWAP_64(tmp.zc_word[0]);
     89 	zcp->zc_word[1] = BSWAP_64(tmp.zc_word[1]);
     90 	zcp->zc_word[2] = BSWAP_64(tmp.zc_word[2]);
     91 	zcp->zc_word[3] = BSWAP_64(tmp.zc_word[3]);
     92 }
     93 #endif
     94