sha256.c

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/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */
#include <sys/zfs_context.h>
#include <sys/zio.h>
#ifdef _KERNEL
#include <crypto/sha2/sha2.h>
#else
#include <sha256.h>
#endif

void
zio_checksum_SHA256(const void *buf, uint64_t size, zio_cksum_t *zcp)
{
        SHA256_CTX ctx;
        zio_cksum_t tmp;

        SHA256_Init(&ctx);
        SHA256_Update(&ctx, buf, size);
        SHA256_Final((unsigned char *)&tmp, &ctx);

        /*
         * A prior implementation of this function had a
         * private SHA256 implementation always wrote things out in
         * Big Endian and there wasn't a byteswap variant of it.
         * To preseve on disk compatibility we need to force that
         * behaviour.
         */
        zcp->zc_word[0] = BE_64(tmp.zc_word[0]);
        zcp->zc_word[1] = BE_64(tmp.zc_word[1]);
        zcp->zc_word[2] = BE_64(tmp.zc_word[2]);
        zcp->zc_word[3] = BE_64(tmp.zc_word[3]);
}