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 * Use is subject to license terms. 24 */ 25 /* 26 * Copyright (c) 2016 by Delphix. All rights reserved. 27 */ 28 #include <sys/zfs_context.h> 29 #include <sys/zio.h> 30 #include <sys/edonr.h> 31 #include <sys/abd.h> 32 33 #define EDONR_MODE 512 34 #define EDONR_BLOCK_SIZE EdonR512_BLOCK_SIZE 35 36 static int 37 edonr_incremental(void *buf, size_t size, void *arg) 38 { 39 EdonRState *ctx = arg; 40 EdonRUpdate(ctx, buf, size * 8); 41 return (0); 42 } 43 44 /* 45 * Native zio_checksum interface for the Edon-R hash function. 46 */ 47 /*ARGSUSED*/ 48 void 49 abd_checksum_edonr_native(abd_t *abd, uint64_t size, 50 const void *ctx_template, zio_cksum_t *zcp) 51 { 52 uint8_t digest[EDONR_MODE / 8]; 53 EdonRState ctx; 54 55 ASSERT(ctx_template != NULL); 56 bcopy(ctx_template, &ctx, sizeof (ctx)); 57 (void) abd_iterate_func(abd, 0, size, edonr_incremental, &ctx); 58 EdonRFinal(&ctx, digest); 59 bcopy(digest, zcp->zc_word, sizeof (zcp->zc_word)); 60 } 61 62 /* 63 * Byteswapped zio_checksum interface for the Edon-R hash function. 64 */ 65 void 66 abd_checksum_edonr_byteswap(abd_t *abd, uint64_t size, 67 const void *ctx_template, zio_cksum_t *zcp) 68 { 69 zio_cksum_t tmp; 70 71 abd_checksum_edonr_native(abd, size, ctx_template, &tmp); 72 zcp->zc_word[0] = BSWAP_64(zcp->zc_word[0]); 73 zcp->zc_word[1] = BSWAP_64(zcp->zc_word[1]); 74 zcp->zc_word[2] = BSWAP_64(zcp->zc_word[2]); 75 zcp->zc_word[3] = BSWAP_64(zcp->zc_word[3]); 76 } 77 78 void * 79 abd_checksum_edonr_tmpl_init(const zio_cksum_salt_t *salt) 80 { 81 EdonRState *ctx; 82 uint8_t salt_block[EDONR_BLOCK_SIZE]; 83 84 /* 85 * Edon-R needs all but the last hash invocation to be on full-size 86 * blocks, but the salt is too small. Rather than simply padding it 87 * with zeros, we expand the salt into a new salt block of proper 88 * size by double-hashing it (the new salt block will be composed of 89 * H(salt) || H(H(salt))). 90 */ 91 CTASSERT(EDONR_BLOCK_SIZE == 2 * (EDONR_MODE / 8)); 92 EdonRHash(EDONR_MODE, salt->zcs_bytes, sizeof (salt->zcs_bytes) * 8, 93 salt_block); 94 EdonRHash(EDONR_MODE, salt_block, EDONR_MODE, salt_block + 95 EDONR_MODE / 8); 96 97 /* 98 * Feed the new salt block into the hash function - this will serve 99 * as our MAC key. 100 */ 101 ctx = kmem_zalloc(sizeof (*ctx), KM_SLEEP); 102 EdonRInit(ctx, EDONR_MODE); 103 EdonRUpdate(ctx, salt_block, sizeof (salt_block) * 8); 104 return (ctx); 105 } 106 107 void 108 abd_checksum_edonr_tmpl_free(void *ctx_template) 109 { 110 EdonRState *ctx = ctx_template; 111 112 bzero(ctx, sizeof (*ctx)); 113 kmem_free(ctx, sizeof (*ctx)); 114 } 115