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-rw-r--r--uts/common/fs/zfs/sha256.c50
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diff --git a/uts/common/fs/zfs/sha256.c b/uts/common/fs/zfs/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>
+#include <sys/sha2.h>
+
+void
+zio_checksum_SHA256(const void *buf, uint64_t size, zio_cksum_t *zcp)
+{
+ SHA2_CTX ctx;
+ zio_cksum_t tmp;
+
+ SHA2Init(SHA256, &ctx);
+ SHA2Update(&ctx, buf, size);
+ SHA2Final(&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]);
+}