xref: /freebsd/sys/dev/random/fenestrasX/fx_hash.h (revision e6bfd18d21b225af6a0ed67ceeaf1293b7b9eba5)
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  * $FreeBSD$
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  */
42 struct fxrng_hash {
43 	blake2b_state	state;
44 };
45 
46 static inline void
47 fxrng_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 
55 static inline void
56 fxrng_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 
64 static inline void
65 fxrng_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