1289310Smav/* 2289310Smav * CDDL HEADER START 3289310Smav * 4289310Smav * The contents of this file are subject to the terms of the 5289310Smav * Common Development and Distribution License (the "License"). 6289310Smav * You may not use this file except in compliance with the License. 7289310Smav * 8289310Smav * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9289310Smav * or http://opensource.org/licenses/CDDL-1.0. 10289310Smav * See the License for the specific language governing permissions 11289310Smav * and limitations under the License. 12289310Smav * 13289310Smav * When distributing Covered Code, include this CDDL HEADER in each 14289310Smav * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15289310Smav * If applicable, add the following below this CDDL HEADER, with the 16289310Smav * fields enclosed by brackets "[]" replaced with your own identifying 17289310Smav * information: Portions Copyright [yyyy] [name of copyright owner] 18289310Smav * 19289310Smav * CDDL HEADER END 20289310Smav */ 21289310Smav/* 22289310Smav * Copyright 2013 Saso Kiselkov. All rights reserved. 23289310Smav */ 24289310Smav#include <sys/zfs_context.h> 25289310Smav#include <sys/zio.h> 26289310Smav#include <sys/skein.h> 27289310Smav 28289310Smav/* 29289310Smav * Computes a native 256-bit skein MAC checksum. Please note that this 30289310Smav * function requires the presence of a ctx_template that should be allocated 31289310Smav * using zio_checksum_skein_tmpl_init. 32289310Smav */ 33289310Smav/*ARGSUSED*/ 34289310Smavvoid 35289310Smavzio_checksum_skein_native(const void *buf, uint64_t size, 36289310Smav const void *ctx_template, zio_cksum_t *zcp) 37289310Smav{ 38289310Smav Skein_512_Ctxt_t ctx; 39289310Smav 40289310Smav ASSERT(ctx_template != NULL); 41289310Smav bcopy(ctx_template, &ctx, sizeof (ctx)); 42289310Smav (void) Skein_512_Update(&ctx, buf, size); 43289310Smav (void) Skein_512_Final(&ctx, (uint8_t *)zcp); 44289310Smav bzero(&ctx, sizeof (ctx)); 45289310Smav} 46289310Smav 47289310Smav/* 48289310Smav * Byteswapped version of zio_checksum_skein_native. This just invokes 49289310Smav * the native checksum function and byteswaps the resulting checksum (since 50289310Smav * skein is internally endian-insensitive). 51289310Smav */ 52289310Smavvoid 53289310Smavzio_checksum_skein_byteswap(const void *buf, uint64_t size, 54289310Smav const void *ctx_template, zio_cksum_t *zcp) 55289310Smav{ 56289310Smav zio_cksum_t tmp; 57289310Smav 58289310Smav zio_checksum_skein_native(buf, size, ctx_template, &tmp); 59289310Smav zcp->zc_word[0] = BSWAP_64(tmp.zc_word[0]); 60289310Smav zcp->zc_word[1] = BSWAP_64(tmp.zc_word[1]); 61289310Smav zcp->zc_word[2] = BSWAP_64(tmp.zc_word[2]); 62289310Smav zcp->zc_word[3] = BSWAP_64(tmp.zc_word[3]); 63289310Smav} 64289310Smav 65289310Smav/* 66289310Smav * Allocates a skein MAC template suitable for using in skein MAC checksum 67289310Smav * computations and returns a pointer to it. 68289310Smav */ 69289310Smavvoid * 70289310Smavzio_checksum_skein_tmpl_init(const zio_cksum_salt_t *salt) 71289310Smav{ 72289310Smav Skein_512_Ctxt_t *ctx; 73289310Smav 74289310Smav ctx = kmem_zalloc(sizeof (*ctx), KM_SLEEP); 75289310Smav (void) Skein_512_InitExt(ctx, sizeof (zio_cksum_t) * 8, 0, 76289310Smav salt->zcs_bytes, sizeof (salt->zcs_bytes)); 77289310Smav return (ctx); 78289310Smav} 79289310Smav 80289310Smav/* 81289310Smav * Frees a skein context template previously allocated using 82289310Smav * zio_checksum_skein_tmpl_init. 83289310Smav */ 84289310Smavvoid 85289310Smavzio_checksum_skein_tmpl_free(void *ctx_template) 86289310Smav{ 87289310Smav Skein_512_Ctxt_t *ctx = ctx_template; 88289310Smav 89289310Smav bzero(ctx, sizeof (*ctx)); 90289310Smav kmem_free(ctx, sizeof (*ctx)); 91289310Smav} 92