2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2000-2015, 2017 Mark R. V. Murray
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer
12 * in this position and unchanged.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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31 #ifndef _SYS_RANDOM_H_
32 #define _SYS_RANDOM_H_
34 #include <sys/types.h>
40 #if defined(DEV_RANDOM)
41 u_int read_random(void *, u_int);
42 int read_random_uio(struct uio *, bool);
45 read_random_uio(void *a __unused, u_int b __unused)
50 read_random(void *a __unused, u_int b __unused)
57 * Note: if you add or remove members of random_entropy_source, remember to
58 * also update the strings in the static array random_source_descr[] in
61 enum random_entropy_source {
64 /* Environmental sources */
74 RANDOM_UMA, /* Special!! UMA/SLAB Allocator */
75 RANDOM_ENVIRONMENTAL_END = RANDOM_UMA,
76 /* Fast hardware random-number sources from here on. */
78 RANDOM_PURE_OCTEON = RANDOM_PURE_START,
92 _Static_assert(ENTROPYSOURCE <= 32,
93 "hardcoded assumption that values fit in a typical word-sized bitset");
95 #define RANDOM_LEGACY_BOOT_ENTROPY_MODULE "/boot/entropy"
96 #define RANDOM_CACHED_BOOT_ENTROPY_MODULE "boot_entropy_cache"
97 #define RANDOM_CACHED_SKIP_START 256
99 #if defined(DEV_RANDOM)
100 extern u_int hc_source_mask;
101 void random_harvest_queue_(const void *, u_int, enum random_entropy_source);
102 void random_harvest_fast_(const void *, u_int);
103 void random_harvest_direct_(const void *, u_int, enum random_entropy_source);
106 random_harvest_queue(const void *entropy, u_int size, enum random_entropy_source origin)
109 if (hc_source_mask & (1 << origin))
110 random_harvest_queue_(entropy, size, origin);
114 random_harvest_fast(const void *entropy, u_int size, enum random_entropy_source origin)
117 if (hc_source_mask & (1 << origin))
118 random_harvest_fast_(entropy, size);
122 random_harvest_direct(const void *entropy, u_int size, enum random_entropy_source origin)
125 if (hc_source_mask & (1 << origin))
126 random_harvest_direct_(entropy, size, origin);
129 void random_harvest_register_source(enum random_entropy_source);
130 void random_harvest_deregister_source(enum random_entropy_source);
132 #define random_harvest_queue(a, b, c) do {} while (0)
133 #define random_harvest_fast(a, b, c) do {} while (0)
134 #define random_harvest_direct(a, b, c) do {} while (0)
135 #define random_harvest_register_source(a) do {} while (0)
136 #define random_harvest_deregister_source(a) do {} while (0)
139 #if defined(RANDOM_ENABLE_UMA)
140 #define random_harvest_fast_uma(a, b, c) random_harvest_fast(a, b, c)
141 #else /* !defined(RANDOM_ENABLE_UMA) */
142 #define random_harvest_fast_uma(a, b, c) do {} while (0)
143 #endif /* defined(RANDOM_ENABLE_UMA) */
145 #if defined(RANDOM_ENABLE_ETHER)
146 #define random_harvest_queue_ether(a, b) random_harvest_queue(a, b, RANDOM_NET_ETHER)
147 #else /* !defined(RANDOM_ENABLE_ETHER) */
148 #define random_harvest_queue_ether(a, b) do {} while (0)
149 #endif /* defined(RANDOM_ENABLE_ETHER) */
154 #define GRND_NONBLOCK 0x1
155 #define GRND_RANDOM 0x2
156 ssize_t getrandom(void *buf, size_t buflen, unsigned int flags);
158 #endif /* _SYS_RANDOM_H_ */