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