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://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 2013 Saso Kiselkov. All rights reserved. 23 * Copyright (c) 2016 by Delphix. All rights reserved. 24 */ 25#include <sys/zfs_context.h> 26#include <sys/zio.h> 27#ifdef _KERNEL 28#include <crypto/skein/skein.h> 29#else 30#include <skein.h> 31#endif 32#include <sys/abd.h> 33 34static int 35skein_incremental(void *buf, size_t size, void *arg) 36{ 37 Skein_512_Ctxt_t *ctx = arg; 38 (void) Skein_512_Update(ctx, buf, size); 39 return (0); 40} 41 42/* 43 * Computes a native 256-bit skein MAC checksum. Please note that this 44 * function requires the presence of a ctx_template that should be allocated 45 * using abd_checksum_skein_tmpl_init. 46 */ 47/*ARGSUSED*/ 48void 49abd_checksum_skein_native(abd_t *abd, uint64_t size, 50 const void *ctx_template, zio_cksum_t *zcp) 51{ 52 Skein_512_Ctxt_t ctx; 53 54 ASSERT(ctx_template != NULL); 55 bcopy(ctx_template, &ctx, sizeof (ctx)); 56 (void) abd_iterate_func(abd, 0, size, skein_incremental, &ctx); 57 (void) Skein_512_Final(&ctx, (uint8_t *)zcp); 58 bzero(&ctx, sizeof (ctx)); 59} 60 61/* 62 * Byteswapped version of abd_checksum_skein_native. This just invokes 63 * the native checksum function and byteswaps the resulting checksum (since 64 * skein is internally endian-insensitive). 65 */ 66void 67abd_checksum_skein_byteswap(abd_t *abd, uint64_t size, 68 const void *ctx_template, zio_cksum_t *zcp) 69{ 70 zio_cksum_t tmp; 71 72 abd_checksum_skein_native(abd, size, ctx_template, &tmp); 73 zcp->zc_word[0] = BSWAP_64(tmp.zc_word[0]); 74 zcp->zc_word[1] = BSWAP_64(tmp.zc_word[1]); 75 zcp->zc_word[2] = BSWAP_64(tmp.zc_word[2]); 76 zcp->zc_word[3] = BSWAP_64(tmp.zc_word[3]); 77} 78 79/* 80 * Allocates a skein MAC template suitable for using in skein MAC checksum 81 * computations and returns a pointer to it. 82 */ 83void * 84abd_checksum_skein_tmpl_init(const zio_cksum_salt_t *salt) 85{ 86 Skein_512_Ctxt_t *ctx; 87 88 ctx = kmem_zalloc(sizeof (*ctx), KM_SLEEP); 89 (void) Skein_512_InitExt(ctx, sizeof (zio_cksum_t) * 8, 0, 90 salt->zcs_bytes, sizeof (salt->zcs_bytes)); 91 return (ctx); 92} 93 94/* 95 * Frees a skein context template previously allocated using 96 * abd_checksum_skein_tmpl_init. 97 */ 98void 99abd_checksum_skein_tmpl_free(void *ctx_template) 100{ 101 Skein_512_Ctxt_t *ctx = ctx_template; 102 103 bzero(ctx, sizeof (*ctx)); 104 kmem_free(ctx, sizeof (*ctx)); 105} 106