1 | /* $NetBSD: rndpool.h,v 1.3 2015/04/14 13:14:20 riastradh Exp $ */ |
2 | |
3 | /*- |
4 | * Copyright (c) 1997 The NetBSD Foundation, Inc. |
5 | * All rights reserved. |
6 | * |
7 | * This code is derived from software contributed to The NetBSD Foundation |
8 | * by Michael Graff <explorer@flame.org>. This code uses ideas and |
9 | * algorithms from the Linux driver written by Ted Ts'o. |
10 | * |
11 | * Redistribution and use in source and binary forms, with or without |
12 | * modification, are permitted provided that the following conditions |
13 | * are met: |
14 | * 1. Redistributions of source code must retain the above copyright |
15 | * notice, this list of conditions and the following disclaimer. |
16 | * 2. Redistributions in binary form must reproduce the above copyright |
17 | * notice, this list of conditions and the following disclaimer in the |
18 | * documentation and/or other materials provided with the distribution. |
19 | * |
20 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
21 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
22 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
23 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
24 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
25 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
26 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
27 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
28 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
29 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
30 | * POSSIBILITY OF SUCH DAMAGE. |
31 | */ |
32 | |
33 | #ifndef _SYS_RNDPOOL_H |
34 | #define _SYS_RNDPOOL_H |
35 | |
36 | #ifndef _KERNEL /* XXX */ |
37 | #error <sys/rndpool.h> is meant for kernel consumers only. |
38 | #endif |
39 | |
40 | #include <sys/types.h> |
41 | #include <sys/rndio.h> /* rndpoolstat_t */ |
42 | |
43 | /* |
44 | * Size of entropy pool in 32-bit words. This _MUST_ be a power of 2. Don't |
45 | * change this unless you really know what you are doing... |
46 | */ |
47 | #ifndef RND_POOLWORDS |
48 | #define RND_POOLWORDS 128 |
49 | #endif |
50 | #define RND_POOLBITS (RND_POOLWORDS * 32) |
51 | |
52 | typedef struct { |
53 | uint32_t cursor; /* current add point in the pool */ |
54 | uint32_t rotate; /* how many bits to rotate by */ |
55 | rndpoolstat_t stats; /* current statistics */ |
56 | uint32_t pool[RND_POOLWORDS]; /* random pool data */ |
57 | } rndpool_t; |
58 | |
59 | /* Mode for rnd_extract_data. */ |
60 | #define 0 /* extract as many bits as requested */ |
61 | #define 1 /* extract as many bits as we have counted |
62 | * entropy */ |
63 | |
64 | void rndpool_init(rndpool_t *); |
65 | uint32_t rndpool_get_entropy_count(rndpool_t *); |
66 | void rndpool_set_entropy_count(rndpool_t *, uint32_t); |
67 | void rndpool_get_stats(rndpool_t *, void *, int); |
68 | void rndpool_add_data(rndpool_t *, |
69 | const void *const , uint32_t, uint32_t); |
70 | uint32_t (rndpool_t *, void *, uint32_t, uint32_t); |
71 | |
72 | #endif /* _SYS_RNDPOOL_H */ |
73 | |