1/*-
2 * SPDX-License-Identifier: BSD-2-Clause
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#pragma once
28
29#include <dev/random/fenestrasX/fx_priv.h>
30#define	blake2b_init	blake2b_init_ref
31#define	blake2b_update	blake2b_update_ref
32#define	blake2b_final	blake2b_final_ref
33#include <contrib/libb2/blake2.h>
34
35#define	FXRNG_HASH_SZ	BLAKE2B_OUTBYTES	/* 64 */
36
37/*
38 * Wrappers for hash function abstraction.
39 */
40struct fxrng_hash {
41	blake2b_state	state;
42};
43
44static inline void
45fxrng_hash_init(struct fxrng_hash *h)
46{
47	int rc;
48
49	rc = blake2b_init(&h->state, FXRNG_HASH_SZ);
50	ASSERT(rc == 0, "blake2b_init");
51}
52
53static inline void
54fxrng_hash_update(struct fxrng_hash *h, const void *buf, size_t sz)
55{
56	int rc;
57
58	rc = blake2b_update(&h->state, buf, sz);
59	ASSERT(rc == 0, "blake2b_update");
60}
61
62static inline void
63fxrng_hash_finish(struct fxrng_hash *h, uint8_t buf[static FXRNG_HASH_SZ], size_t sz)
64{
65	int rc;
66
67	rc = blake2b_final(&h->state, buf, sz);
68	ASSERT(rc == 0, "blake2b_final(sz=%zu)", sz);
69	explicit_bzero(h, sizeof(*h));
70}
71