| 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 | |