150276Speter/* 250276Speter * CDDL HEADER START 350276Speter * 450276Speter * The contents of this file are subject to the terms of the 550276Speter * Common Development and Distribution License (the "License"). 650276Speter * You may not use this file except in compliance with the License. 750276Speter * 850276Speter * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 950276Speter * or http://opensource.org/licenses/CDDL-1.0. 1050276Speter * See the License for the specific language governing permissions 1150276Speter * and limitations under the License. 1250276Speter * 1350276Speter * When distributing Covered Code, include this CDDL HEADER in each 1450276Speter * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 1550276Speter * If applicable, add the following below this CDDL HEADER, with the 1650276Speter * fields enclosed by brackets "[]" replaced with your own identifying 1750276Speter * information: Portions Copyright [yyyy] [name of copyright owner] 1850276Speter * 1950276Speter * CDDL HEADER END 2050276Speter */ 2150276Speter/* 2250276Speter * Copyright 2013 Saso Kiselkov. All rights reserved. 2350276Speter */ 2450276Speter#include <sys/zfs_context.h> 2550276Speter#include <sys/zio.h> 2650276Speter#ifdef _KERNEL 2750276Speter#include <crypto/skein/skein.h> 2850276Speter#else 2950276Speter#include <skein.h> 3050276Speter#endif 3150276Speter 3250276Speter/* 3350276Speter * Computes a native 256-bit skein MAC checksum. Please note that this 3450276Speter * function requires the presence of a ctx_template that should be allocated 3550276Speter * using zio_checksum_skein_tmpl_init. 3650276Speter */ 3750276Speter/*ARGSUSED*/ 3850276Spetervoid 3950276Speterzio_checksum_skein_native(const void *buf, uint64_t size, 4050276Speter const void *ctx_template, zio_cksum_t *zcp) 4150276Speter{ 4250276Speter Skein_512_Ctxt_t ctx; 4350276Speter 4450276Speter ASSERT(ctx_template != NULL); 4550276Speter bcopy(ctx_template, &ctx, sizeof (ctx)); 4650276Speter (void) Skein_512_Update(&ctx, buf, size); 4750276Speter (void) Skein_512_Final(&ctx, (uint8_t *)zcp); 4850276Speter bzero(&ctx, sizeof (ctx)); 4950276Speter} 5050276Speter 5150276Speter/* 5250276Speter * Byteswapped version of zio_checksum_skein_native. This just invokes 5350276Speter * the native checksum function and byteswaps the resulting checksum (since 5450276Speter * skein is internally endian-insensitive). 5550276Speter */ 5650276Spetervoid 5750276Speterzio_checksum_skein_byteswap(const void *buf, uint64_t size, 5850276Speter const void *ctx_template, zio_cksum_t *zcp) 5950276Speter{ 6050276Speter zio_cksum_t tmp; 6150276Speter 6250276Speter zio_checksum_skein_native(buf, size, ctx_template, &tmp); 6350276Speter zcp->zc_word[0] = BSWAP_64(tmp.zc_word[0]); 6450276Speter zcp->zc_word[1] = BSWAP_64(tmp.zc_word[1]); 6550276Speter zcp->zc_word[2] = BSWAP_64(tmp.zc_word[2]); 6650276Speter zcp->zc_word[3] = BSWAP_64(tmp.zc_word[3]); 6750276Speter} 6850276Speter 6950276Speter/* 7050276Speter * Allocates a skein MAC template suitable for using in skein MAC checksum 7150276Speter * computations and returns a pointer to it. 7250276Speter */ 7350276Spetervoid * 7450276Speterzio_checksum_skein_tmpl_init(const zio_cksum_salt_t *salt) 7550276Speter{ 7650276Speter Skein_512_Ctxt_t *ctx; 7750276Speter 7850276Speter ctx = kmem_zalloc(sizeof (*ctx), KM_SLEEP); 7950276Speter (void) Skein_512_InitExt(ctx, sizeof (zio_cksum_t) * 8, 0, 8050276Speter salt->zcs_bytes, sizeof (salt->zcs_bytes)); 8150276Speter return (ctx); 8250276Speter} 8350276Speter 8450276Speter/* 8550276Speter * Frees a skein context template previously allocated using 8650276Speter * zio_checksum_skein_tmpl_init. 8750276Speter */ 8850276Spetervoid 8950276Speterzio_checksum_skein_tmpl_free(void *ctx_template) 9050276Speter{ 9150276Speter Skein_512_Ctxt_t *ctx = ctx_template; 9250276Speter 9350276Speter bzero(ctx, sizeof (*ctx)); 9450276Speter kmem_free(ctx, sizeof (*ctx)); 9550276Speter} 9650276Speter