1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2019 Conrad Meyer <cem@FreeBSD.org>
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 *
27 * $FreeBSD$
28 */
29#pragma once
30
31#include <dev/random/fenestrasX/fx_priv.h>
32#define	blake2b_init	blake2b_init_ref
33#define	blake2b_update	blake2b_update_ref
34#define	blake2b_final	blake2b_final_ref
35#include <contrib/libb2/blake2.h>
36
37#define	FXRNG_HASH_SZ	BLAKE2B_OUTBYTES	/* 64 */
38
39/*
40 * Wrappers for hash function abstraction.
41 */
42struct fxrng_hash {
43	blake2b_state	state;
44};
45
46static inline void
47fxrng_hash_init(struct fxrng_hash *h)
48{
49	int rc;
50
51	rc = blake2b_init(&h->state, FXRNG_HASH_SZ);
52	ASSERT(rc == 0, "blake2b_init");
53}
54
55static inline void
56fxrng_hash_update(struct fxrng_hash *h, const void *buf, size_t sz)
57{
58	int rc;
59
60	rc = blake2b_update(&h->state, buf, sz);
61	ASSERT(rc == 0, "blake2b_update");
62}
63
64static inline void
65fxrng_hash_finish(struct fxrng_hash *h, uint8_t buf[static FXRNG_HASH_SZ], size_t sz)
66{
67	int rc;
68
69	rc = blake2b_final(&h->state, buf, sz);
70	ASSERT(rc == 0, "blake2b_final(sz=%zu)", sz);
71	explicit_bzero(h, sizeof(*h));
72}
73