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