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/zio_checksum.h> 31 #include <sys/edonr.h> 32 #include <sys/abd.h> 33 34 #define EDONR_MODE 512 35 #define EDONR_BLOCK_SIZE EdonR512_BLOCK_SIZE 36 37 static int 38 edonr_incremental(void *buf, size_t size, void *arg) 39 { 40 EdonRState *ctx = arg; 41 EdonRUpdate(ctx, buf, size * 8); 42 return (0); 43 } 44 45 /* 46 * Native zio_checksum interface for the Edon-R hash function. 47 */ 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 memcpy(&ctx, ctx_template, sizeof (ctx)); 57 (void) abd_iterate_func(abd, 0, size, edonr_incremental, &ctx); 58 EdonRFinal(&ctx, digest); 59 memcpy(zcp->zc_word, digest, 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 _Static_assert(EDONR_BLOCK_SIZE == 2 * (EDONR_MODE / 8), 92 "Edon-R block size mismatch"); 93 EdonRHash(salt->zcs_bytes, sizeof (salt->zcs_bytes) * 8, salt_block); 94 EdonRHash(salt_block, EDONR_MODE, salt_block + EDONR_MODE / 8); 95 96 /* 97 * Feed the new salt block into the hash function - this will serve 98 * as our MAC key. 99 */ 100 ctx = kmem_zalloc(sizeof (*ctx), KM_SLEEP); 101 EdonRInit(ctx); 102 EdonRUpdate(ctx, salt_block, sizeof (salt_block) * 8); 103 return (ctx); 104 } 105 106 void 107 abd_checksum_edonr_tmpl_free(void *ctx_template) 108 { 109 EdonRState *ctx = ctx_template; 110 111 memset(ctx, 0, sizeof (*ctx)); 112 kmem_free(ctx, sizeof (*ctx)); 113 } 114