yarrow.h revision 62841
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 62841 2000-07-09 11:52:12Z markm $ 27 */ 28 29#define ENTROPYBIN 256 /* buckets to harvest entropy events */ 30#define ENTROPYSOURCE 2 /* entropy sources (actually classes) */ 31 /* The entropy classes will as follows: */ 32 /* 0 - Keyboard */ 33 /* 1 - Mouse */ 34 /* to start with. More will be added */ 35 36#define TIMEBIN 16 /* max value for Pt/t */ 37#define KEYSIZE 32 /* 32 bytes == 256 bits */ 38 39#define FAST 0 40#define SLOW 1 41 42void random_init(void); 43void random_deinit(void); 44void random_init_harvester(void (*)(struct timespec *, u_int64_t, u_int, u_int, enum esource)); 45void random_deinit_harvester(void); 46 47/* This is the beasite that needs protecting. It contains all of the 48 * state that we are excited about. 49 * This is a biiig structure. It may move over to a malloc(9)ed 50 * replacement. 51 */ 52struct random_state { 53 u_int64_t counter; /* C */ 54 BF_KEY key; /* K */ 55 int gengateinterval; /* Pg */ 56 int bins; /* Pt/t */ 57 u_char ivec[8]; /* Blowfish internal */ 58 int outputblocks; /* count output blocks for gates */ 59 u_int slowoverthresh; /* slow pool overthreshhold reseed count */ 60 struct pool { 61 struct source { 62 struct entropy { 63 struct timespec nanotime; 64 u_int64_t data; 65 } entropy[ENTROPYBIN]; /* entropy units - must each 66 be <= KEYSIZE */ 67 u_int bits; /* estimated bits of entropy */ 68 u_int frac; /* fractional bits of entropy 69 (given as 1024/n) */ 70 u_int current; /* next insertion point */ 71 } source[ENTROPYSOURCE]; 72 u_int thresh; /* pool reseed threshhold */ 73 } pool[2]; /* pool[0] is fast, pool[1] is slow */ 74 int which; /* toggle - shows the current insertion pool */ 75}; 76 77extern struct random_state random_state; 78