| /* |
| * 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://opensource.org/licenses/CDDL-1.0. |
| * 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 2013 Saso Kiselkov. All rights reserved. |
| * Copyright (c) 2016 by Delphix. All rights reserved. |
| */ |
| #include <sys/zfs_context.h> |
| #include <sys/zio.h> |
| #include <sys/skein.h> |
| |
| #include <sys/abd.h> |
| |
| static int |
| skein_incremental(void *buf, size_t size, void *arg) |
| { |
| Skein_512_Ctxt_t *ctx = arg; |
| (void) Skein_512_Update(ctx, buf, size); |
| return (0); |
| } |
| /* |
| * Computes a native 256-bit skein MAC checksum. Please note that this |
| * function requires the presence of a ctx_template that should be allocated |
| * using abd_checksum_skein_tmpl_init. |
| */ |
| /*ARGSUSED*/ |
| void |
| abd_checksum_skein_native(abd_t *abd, uint64_t size, |
| const void *ctx_template, zio_cksum_t *zcp) |
| { |
| Skein_512_Ctxt_t ctx; |
| |
| ASSERT(ctx_template != NULL); |
| bcopy(ctx_template, &ctx, sizeof (ctx)); |
| (void) abd_iterate_func(abd, 0, size, skein_incremental, &ctx); |
| (void) Skein_512_Final(&ctx, (uint8_t *)zcp); |
| bzero(&ctx, sizeof (ctx)); |
| } |
| |
| /* |
| * Byteswapped version of abd_checksum_skein_native. This just invokes |
| * the native checksum function and byteswaps the resulting checksum (since |
| * skein is internally endian-insensitive). |
| */ |
| void |
| abd_checksum_skein_byteswap(abd_t *abd, uint64_t size, |
| const void *ctx_template, zio_cksum_t *zcp) |
| { |
| zio_cksum_t tmp; |
| |
| abd_checksum_skein_native(abd, size, ctx_template, &tmp); |
| zcp->zc_word[0] = BSWAP_64(tmp.zc_word[0]); |
| zcp->zc_word[1] = BSWAP_64(tmp.zc_word[1]); |
| zcp->zc_word[2] = BSWAP_64(tmp.zc_word[2]); |
| zcp->zc_word[3] = BSWAP_64(tmp.zc_word[3]); |
| } |
| |
| /* |
| * Allocates a skein MAC template suitable for using in skein MAC checksum |
| * computations and returns a pointer to it. |
| */ |
| void * |
| abd_checksum_skein_tmpl_init(const zio_cksum_salt_t *salt) |
| { |
| Skein_512_Ctxt_t *ctx; |
| |
| ctx = kmem_zalloc(sizeof (*ctx), KM_SLEEP); |
| (void) Skein_512_InitExt(ctx, sizeof (zio_cksum_t) * 8, 0, |
| salt->zcs_bytes, sizeof (salt->zcs_bytes)); |
| return (ctx); |
| } |
| |
| /* |
| * Frees a skein context template previously allocated using |
| * zio_checksum_skein_tmpl_init. |
| */ |
| void |
| abd_checksum_skein_tmpl_free(void *ctx_template) |
| { |
| Skein_512_Ctxt_t *ctx = ctx_template; |
| |
| bzero(ctx, sizeof (*ctx)); |
| kmem_free(ctx, sizeof (*ctx)); |
| } |