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 * $FreeBSD$ 22 */ 23 /* 24 * Copyright 2013 Saso Kiselkov. All rights reserved. 25 */ 26 #include <skein.h> 27 28 /* 29 * Computes a native 256-bit skein MAC checksum. Please note that this 30 * function requires the presence of a ctx_template that should be allocated 31 * using zio_checksum_skein_tmpl_init. 32 */ 33 /*ARGSUSED*/ 34 static void 35 zio_checksum_skein_native(const void *buf, uint64_t size, 36 const void *ctx_template, zio_cksum_t *zcp) 37 { 38 Skein_512_Ctxt_t ctx; 39 40 ASSERT(ctx_template != NULL); 41 bcopy(ctx_template, &ctx, sizeof (ctx)); 42 (void) Skein_512_Update(&ctx, buf, size); 43 (void) Skein_512_Final(&ctx, (uint8_t *)zcp); 44 bzero(&ctx, sizeof (ctx)); 45 } 46 47 /* 48 * Byteswapped version of zio_checksum_skein_native. This just invokes 49 * the native checksum function and byteswaps the resulting checksum (since 50 * skein is internally endian-insensitive). 51 */ 52 static void 53 zio_checksum_skein_byteswap(const void *buf, uint64_t size, 54 const void *ctx_template, zio_cksum_t *zcp) 55 { 56 zio_cksum_t tmp; 57 58 zio_checksum_skein_native(buf, size, ctx_template, &tmp); 59 zcp->zc_word[0] = BSWAP_64(tmp.zc_word[0]); 60 zcp->zc_word[1] = BSWAP_64(tmp.zc_word[1]); 61 zcp->zc_word[2] = BSWAP_64(tmp.zc_word[2]); 62 zcp->zc_word[3] = BSWAP_64(tmp.zc_word[3]); 63 } 64 65 /* 66 * Allocates a skein MAC template suitable for using in skein MAC checksum 67 * computations and returns a pointer to it. 68 */ 69 static void * 70 zio_checksum_skein_tmpl_init(const zio_cksum_salt_t *salt) 71 { 72 Skein_512_Ctxt_t *ctx; 73 74 ctx = malloc(sizeof (*ctx)); 75 bzero(ctx, sizeof (*ctx)); 76 (void) Skein_512_InitExt(ctx, sizeof (zio_cksum_t) * 8, 0, 77 salt->zcs_bytes, sizeof (salt->zcs_bytes)); 78 return (ctx); 79 } 80 81 /* 82 * Frees a skein context template previously allocated using 83 * zio_checksum_skein_tmpl_init. 84 */ 85 static void 86 zio_checksum_skein_tmpl_free(void *ctx_template) 87 { 88 Skein_512_Ctxt_t *ctx = ctx_template; 89 90 bzero(ctx, sizeof (*ctx)); 91 free(ctx); 92 } 93