1 /* $OpenBSD: rndvar.h,v 1.19 2003/11/03 18:24:28 tedu Exp $ */
2
3 /*
4 * Copyright (c) 1996,2000 Michael Shalayeff.
5 *
6 * This software derived from one contributed by Theodore Ts'o.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
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.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 */
30
31 #ifndef __RNDVAR_H__
32 #define __RNDVAR_H__
33
34 #define POOLWORDS 1024 /* Power of 2 - note that this is 32-bit words */
35
36 #define RND_RND 0 /* real randomness like nuclear chips */
37 #define RND_SRND 1 /* strong random source */
38 #define RND_URND 2 /* less strong random source */
39 #define RND_PRND 3 /* pseudo random source */
40 #define RND_ARND 4 /* aRC4 based random number generator */
41 #define RND_NODEV 5 /* First invalid minor device number */
42
43 #define RND_SRC_TRUE 0
44 #define RND_SRC_TIMER 1
45 #define RND_SRC_MOUSE 2
46 #define RND_SRC_TTY 3
47 #define RND_SRC_DISK 4
48 #define RND_SRC_NET 5
49 #define RND_SRC_AUDIO 6
50 #define RND_SRC_VIDEO 7
51 #define RND_SRC_NUM 8
52
53 struct rndstats {
54 quad_t rnd_total; /* total bits of entropy generated */
55 quad_t rnd_used; /* strong data bits read so far */
56 quad_t rnd_reads; /* strong read calls */
57 quad_t arc4_reads; /* aRC4 data bytes read so far */
58 quad_t arc4_nstirs; /* arc4 pool stirs */
59 quad_t arc4_stirs; /* arc4 pool stirs (bits used) */
60
61 quad_t rnd_pad[5];
62
63 quad_t rnd_waits; /* sleeps for data */
64 quad_t rnd_enqs; /* enqueue calls */
65 quad_t rnd_deqs; /* dequeue calls */
66 quad_t rnd_drops; /* queue-full drops */
67 quad_t rnd_drople; /* queue low watermark low entropy drops */
68
69 quad_t rnd_ed[32]; /* entropy feed distribution */
70 quad_t rnd_sc[RND_SRC_NUM]; /* add* calls */
71 quad_t rnd_sb[RND_SRC_NUM]; /* add* bits */
72 };
73
74 #ifdef _KERNEL
75 extern struct rndstats rndstats;
76
77 #define add_true_randomness(d) enqueue_randomness(RND_SRC_TRUE, (int)(d))
78 #define add_timer_randomness(d) enqueue_randomness(RND_SRC_TIMER, (int)(d))
79 #define add_mouse_randomness(d) enqueue_randomness(RND_SRC_MOUSE, (int)(d))
80 #define add_tty_randomness(d) enqueue_randomness(RND_SRC_TTY, (int)(d))
81 #define add_disk_randomness(d) enqueue_randomness(RND_SRC_DISK, (int)(d))
82 #define add_net_randomness(d) enqueue_randomness(RND_SRC_NET, (int)(d))
83 #define add_audio_randomness(d) enqueue_randomness(RND_SRC_AUDIO, (int)(d))
84 #define add_video_randomness(d) enqueue_randomness(RND_SRC_VIDEO, (int)(d))
85
86 void enqueue_randomness(int, int);
87 void get_random_bytes(void *, size_t);
88 void arc4random_bytes(void *, size_t);
89 u_int32_t arc4random(void);
90
91 #endif /* _KERNEL */
92
93 #endif /* __RNDVAR_H__ */