1*45818ee1SMatthew Ahrens /*
2*45818ee1SMatthew Ahrens * CDDL HEADER START
3*45818ee1SMatthew Ahrens *
4*45818ee1SMatthew Ahrens * The contents of this file are subject to the terms of the
5*45818ee1SMatthew Ahrens * Common Development and Distribution License (the "License").
6*45818ee1SMatthew Ahrens * You may not use this file except in compliance with the License.
7*45818ee1SMatthew Ahrens *
8*45818ee1SMatthew Ahrens * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9*45818ee1SMatthew Ahrens * or http://opensource.org/licenses/CDDL-1.0.
10*45818ee1SMatthew Ahrens * See the License for the specific language governing permissions
11*45818ee1SMatthew Ahrens * and limitations under the License.
12*45818ee1SMatthew Ahrens *
13*45818ee1SMatthew Ahrens * When distributing Covered Code, include this CDDL HEADER in each
14*45818ee1SMatthew Ahrens * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15*45818ee1SMatthew Ahrens * If applicable, add the following below this CDDL HEADER, with the
16*45818ee1SMatthew Ahrens * fields enclosed by brackets "[]" replaced with your own identifying
17*45818ee1SMatthew Ahrens * information: Portions Copyright [yyyy] [name of copyright owner]
18*45818ee1SMatthew Ahrens *
19*45818ee1SMatthew Ahrens * CDDL HEADER END
20*45818ee1SMatthew Ahrens */
21*45818ee1SMatthew Ahrens /*
22*45818ee1SMatthew Ahrens * Copyright 2013 Saso Kiselkov. All rights reserved.
23*45818ee1SMatthew Ahrens */
24*45818ee1SMatthew Ahrens #include <sys/zfs_context.h>
25*45818ee1SMatthew Ahrens #include <sys/zio.h>
26*45818ee1SMatthew Ahrens #include <sys/skein.h>
27*45818ee1SMatthew Ahrens
28*45818ee1SMatthew Ahrens /*
29*45818ee1SMatthew Ahrens * Computes a native 256-bit skein MAC checksum. Please note that this
30*45818ee1SMatthew Ahrens * function requires the presence of a ctx_template that should be allocated
31*45818ee1SMatthew Ahrens * using zio_checksum_skein_tmpl_init.
32*45818ee1SMatthew Ahrens */
33*45818ee1SMatthew Ahrens /*ARGSUSED*/
34*45818ee1SMatthew Ahrens void
zio_checksum_skein_native(const void * buf,uint64_t size,const void * ctx_template,zio_cksum_t * zcp)35*45818ee1SMatthew Ahrens zio_checksum_skein_native(const void *buf, uint64_t size,
36*45818ee1SMatthew Ahrens const void *ctx_template, zio_cksum_t *zcp)
37*45818ee1SMatthew Ahrens {
38*45818ee1SMatthew Ahrens Skein_512_Ctxt_t ctx;
39*45818ee1SMatthew Ahrens
40*45818ee1SMatthew Ahrens ASSERT(ctx_template != NULL);
41*45818ee1SMatthew Ahrens bcopy(ctx_template, &ctx, sizeof (ctx));
42*45818ee1SMatthew Ahrens (void) Skein_512_Update(&ctx, buf, size);
43*45818ee1SMatthew Ahrens (void) Skein_512_Final(&ctx, (uint8_t *)zcp);
44*45818ee1SMatthew Ahrens bzero(&ctx, sizeof (ctx));
45*45818ee1SMatthew Ahrens }
46*45818ee1SMatthew Ahrens
47*45818ee1SMatthew Ahrens /*
48*45818ee1SMatthew Ahrens * Byteswapped version of zio_checksum_skein_native. This just invokes
49*45818ee1SMatthew Ahrens * the native checksum function and byteswaps the resulting checksum (since
50*45818ee1SMatthew Ahrens * skein is internally endian-insensitive).
51*45818ee1SMatthew Ahrens */
52*45818ee1SMatthew Ahrens void
zio_checksum_skein_byteswap(const void * buf,uint64_t size,const void * ctx_template,zio_cksum_t * zcp)53*45818ee1SMatthew Ahrens zio_checksum_skein_byteswap(const void *buf, uint64_t size,
54*45818ee1SMatthew Ahrens const void *ctx_template, zio_cksum_t *zcp)
55*45818ee1SMatthew Ahrens {
56*45818ee1SMatthew Ahrens zio_cksum_t tmp;
57*45818ee1SMatthew Ahrens
58*45818ee1SMatthew Ahrens zio_checksum_skein_native(buf, size, ctx_template, &tmp);
59*45818ee1SMatthew Ahrens zcp->zc_word[0] = BSWAP_64(tmp.zc_word[0]);
60*45818ee1SMatthew Ahrens zcp->zc_word[1] = BSWAP_64(tmp.zc_word[1]);
61*45818ee1SMatthew Ahrens zcp->zc_word[2] = BSWAP_64(tmp.zc_word[2]);
62*45818ee1SMatthew Ahrens zcp->zc_word[3] = BSWAP_64(tmp.zc_word[3]);
63*45818ee1SMatthew Ahrens }
64*45818ee1SMatthew Ahrens
65*45818ee1SMatthew Ahrens /*
66*45818ee1SMatthew Ahrens * Allocates a skein MAC template suitable for using in skein MAC checksum
67*45818ee1SMatthew Ahrens * computations and returns a pointer to it.
68*45818ee1SMatthew Ahrens */
69*45818ee1SMatthew Ahrens void *
zio_checksum_skein_tmpl_init(const zio_cksum_salt_t * salt)70*45818ee1SMatthew Ahrens zio_checksum_skein_tmpl_init(const zio_cksum_salt_t *salt)
71*45818ee1SMatthew Ahrens {
72*45818ee1SMatthew Ahrens Skein_512_Ctxt_t *ctx;
73*45818ee1SMatthew Ahrens
74*45818ee1SMatthew Ahrens ctx = kmem_zalloc(sizeof (*ctx), KM_SLEEP);
75*45818ee1SMatthew Ahrens (void) Skein_512_InitExt(ctx, sizeof (zio_cksum_t) * 8, 0,
76*45818ee1SMatthew Ahrens salt->zcs_bytes, sizeof (salt->zcs_bytes));
77*45818ee1SMatthew Ahrens return (ctx);
78*45818ee1SMatthew Ahrens }
79*45818ee1SMatthew Ahrens
80*45818ee1SMatthew Ahrens /*
81*45818ee1SMatthew Ahrens * Frees a skein context template previously allocated using
82*45818ee1SMatthew Ahrens * zio_checksum_skein_tmpl_init.
83*45818ee1SMatthew Ahrens */
84*45818ee1SMatthew Ahrens void
zio_checksum_skein_tmpl_free(void * ctx_template)85*45818ee1SMatthew Ahrens zio_checksum_skein_tmpl_free(void *ctx_template)
86*45818ee1SMatthew Ahrens {
87*45818ee1SMatthew Ahrens Skein_512_Ctxt_t *ctx = ctx_template;
88*45818ee1SMatthew Ahrens
89*45818ee1SMatthew Ahrens bzero(ctx, sizeof (*ctx));
90*45818ee1SMatthew Ahrens kmem_free(ctx, sizeof (*ctx));
91*45818ee1SMatthew Ahrens }
92