diff options
Diffstat (limited to 'module/zfs/skein_zfs.c')
| -rw-r--r-- | module/zfs/skein_zfs.c | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/module/zfs/skein_zfs.c b/module/zfs/skein_zfs.c new file mode 100644 index 000000000..659234039 --- /dev/null +++ b/module/zfs/skein_zfs.c @@ -0,0 +1,91 @@ +/* + * CDDL HEADER START + * + * The contents of this file are subject to the terms of the + * Common Development and Distribution License (the "License"). + * You may not use this file except in compliance with the License. + * + * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE + * or http://opensource.org/licenses/CDDL-1.0. + * See the License for the specific language governing permissions + * and limitations under the License. + * + * When distributing Covered Code, include this CDDL HEADER in each + * file and include the License file at usr/src/OPENSOLARIS.LICENSE. + * If applicable, add the following below this CDDL HEADER, with the + * fields enclosed by brackets "[]" replaced with your own identifying + * information: Portions Copyright [yyyy] [name of copyright owner] + * + * CDDL HEADER END + */ +/* + * Copyright 2013 Saso Kiselkov. All rights reserved. + */ +#include <sys/zfs_context.h> +#include <sys/zio.h> +#include <sys/skein.h> + +/* + * Computes a native 256-bit skein MAC checksum. Please note that this + * function requires the presence of a ctx_template that should be allocated + * using zio_checksum_skein_tmpl_init. + */ +/*ARGSUSED*/ +void +zio_checksum_skein_native(const void *buf, uint64_t size, + const void *ctx_template, zio_cksum_t *zcp) +{ + Skein_512_Ctxt_t ctx; + + ASSERT(ctx_template != NULL); + bcopy(ctx_template, &ctx, sizeof (ctx)); + (void) Skein_512_Update(&ctx, buf, size); + (void) Skein_512_Final(&ctx, (uint8_t *)zcp); + bzero(&ctx, sizeof (ctx)); +} + +/* + * Byteswapped version of zio_checksum_skein_native. This just invokes + * the native checksum function and byteswaps the resulting checksum (since + * skein is internally endian-insensitive). + */ +void +zio_checksum_skein_byteswap(const void *buf, uint64_t size, + const void *ctx_template, zio_cksum_t *zcp) +{ + zio_cksum_t tmp; + + zio_checksum_skein_native(buf, size, ctx_template, &tmp); + zcp->zc_word[0] = BSWAP_64(tmp.zc_word[0]); + zcp->zc_word[1] = BSWAP_64(tmp.zc_word[1]); + zcp->zc_word[2] = BSWAP_64(tmp.zc_word[2]); + zcp->zc_word[3] = BSWAP_64(tmp.zc_word[3]); +} + +/* + * Allocates a skein MAC template suitable for using in skein MAC checksum + * computations and returns a pointer to it. + */ +void * +zio_checksum_skein_tmpl_init(const zio_cksum_salt_t *salt) +{ + Skein_512_Ctxt_t *ctx; + + ctx = kmem_zalloc(sizeof (*ctx), KM_SLEEP); + (void) Skein_512_InitExt(ctx, sizeof (zio_cksum_t) * 8, 0, + salt->zcs_bytes, sizeof (salt->zcs_bytes)); + return (ctx); +} + +/* + * Frees a skein context template previously allocated using + * zio_checksum_skein_tmpl_init. + */ +void +zio_checksum_skein_tmpl_free(void *ctx_template) +{ + Skein_512_Ctxt_t *ctx = ctx_template; + + bzero(ctx, sizeof (*ctx)); + kmem_free(ctx, sizeof (*ctx)); +} |