yarrow.h revision 63771 
1/*-
2 * Copyright (c) 2000 Mark R V Murray
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer
10 *    in this position and unchanged.
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 ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 *
26 * $FreeBSD: head/sys/dev/random/yarrow.h 63771 2000-07-23 11:08:16Z markm $
27 */
28
29/* #define ENTROPYSOURCE nn	   entropy sources (actually classes)
30 *				   The entropy classes will as follows:
31 *					0 - Direct write
32 *					1 - Keyboard
33 *					2 - Mouse
34 */
35
36#define ENTROPYBIN	256	/* buckets to harvest entropy events  */
37#define TIMEBIN		16	/* max value for Pt/t */
38#define KEYSIZE		32	/* 32 bytes == 256 bits */
39
40#define FAST		0
41#define SLOW		1
42
43void random_init(void);
44void random_deinit(void);
45void random_init_harvester(void (*)(struct timespec *, u_int64_t, u_int, u_int, enum esource));
46void random_deinit_harvester(void);
47
48void write_random(char *, u_int);
49
50/* This is the beastie that needs protecting. It contains all of the
51 * state that we are excited about.
52 * This is a biiig structure. It may move over to a malloc(9)ed
53 * replacement.
54 */
55struct random_state {
56	u_int64_t counter;	/* C */
57	BF_KEY key;		/* K */
58	int gengateinterval;	/* Pg */
59	int bins;		/* Pt/t */
60	u_char ivec[8];		/* Blowfish internal */
61	int outputblocks;	/* count output blocks for gates */
62	u_int slowoverthresh;	/* slow pool overthreshhold reseed count */
63	struct pool {
64		struct source {
65			struct entropy {
66				struct timespec	nanotime;
67				u_int64_t data;
68			} entropy[ENTROPYBIN];	/* entropy units - must each
69					   	be <= KEYSIZE */
70			u_int bits;	/* estimated bits of entropy */
71			u_int frac;	/* fractional bits of entropy
72					   (given as 1024/n) */
73			u_int current;	/* next insertion point */
74		} source[ENTROPYSOURCE];
75		u_int thresh;	/* pool reseed threshhold */
76	} pool[2];		/* pool[0] is fast, pool[1] is slow */
77	int which;		/* toggle - shows the current insertion pool */
78};
79
80extern struct random_state random_state;
81