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/*
* 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 2022 Tino Reichardt <milky-zfs@mcmilk.de>
*/
#include <sys/zfs_context.h>
#include <sys/zio_checksum.h>
#include <sys/blake3.h>
#include <sys/abd.h>
static int
blake3_incremental(void *buf, size_t size, void *arg)
{
BLAKE3_CTX *ctx = arg;
Blake3_Update(ctx, buf, size);
return (0);
}
/*
* Computes a native 256-bit BLAKE3 MAC checksum. Please note that this
* function requires the presence of a ctx_template that should be allocated
* using abd_checksum_blake3_tmpl_init.
*/
void
abd_checksum_blake3_native(abd_t *abd, uint64_t size, const void *ctx_template,
zio_cksum_t *zcp)
{
ASSERT(ctx_template != NULL);
#if defined(_KERNEL)
kpreempt_disable();
BLAKE3_CTX *ctx = blake3_per_cpu_ctx[CPU_SEQID];
#else
BLAKE3_CTX *ctx = kmem_alloc(sizeof (*ctx), KM_SLEEP);
#endif
memcpy(ctx, ctx_template, sizeof (*ctx));
(void) abd_iterate_func(abd, 0, size, blake3_incremental, ctx);
Blake3_Final(ctx, (uint8_t *)zcp);
#if defined(_KERNEL)
kpreempt_enable();
#else
memset(ctx, 0, sizeof (*ctx));
kmem_free(ctx, sizeof (*ctx));
#endif
}
/*
* Byteswapped version of abd_checksum_blake3_native. This just invokes
* the native checksum function and byteswaps the resulting checksum (since
* BLAKE3 is internally endian-insensitive).
*/
void
abd_checksum_blake3_byteswap(abd_t *abd, uint64_t size,
const void *ctx_template, zio_cksum_t *zcp)
{
zio_cksum_t tmp;
ASSERT(ctx_template != NULL);
abd_checksum_blake3_native(abd, 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 BLAKE3 MAC template suitable for using in BLAKE3 MAC checksum
* computations and returns a pointer to it.
*/
void *
abd_checksum_blake3_tmpl_init(const zio_cksum_salt_t *salt)
{
BLAKE3_CTX *ctx;
ASSERT(sizeof (salt->zcs_bytes) == 32);
/* init reference object */
ctx = kmem_zalloc(sizeof (*ctx), KM_SLEEP);
Blake3_InitKeyed(ctx, salt->zcs_bytes);
return (ctx);
}
/*
* Frees a BLAKE3 context template previously allocated using
* zio_checksum_blake3_tmpl_init.
*/
void
abd_checksum_blake3_tmpl_free(void *ctx_template)
{
BLAKE3_CTX *ctx = ctx_template;
memset(ctx, 0, sizeof (*ctx));
kmem_free(ctx, sizeof (*ctx));
}
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