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/*-
* Copyright (c) 2000 Mark R V Murray
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer
* in this position and unchanged.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $FreeBSD$
*/
/* #define ENTROPYSOURCE nn entropy sources (actually classes)
* The entropy classes will as follows:
* 0 - Direct write
* 1 - Keyboard
* 2 - Mouse
*/
#define ENTROPYBIN 256 /* buckets to harvest entropy events */
#define TIMEBIN 16 /* max value for Pt/t */
#define FAST 0
#define SLOW 1
int random_init(void);
void random_deinit(void);
void random_init_harvester(void (*)(struct timespec *, void *, u_int, u_int, u_int, enum esource));
void random_deinit_harvester(void);
void random_set_wakeup(int *, int);
void random_set_wakeup_exit(int *, int, int);
void write_random(void *, u_int);
/* This is the beastie that needs protecting. It contains all of the
* state that we are excited about.
* This is a biiig structure. It may move over to a malloc(9)ed
* replacement.
*/
struct random_state {
u_int64_t counter; /* C */
struct yarrowkey key; /* K */
int gengateinterval; /* Pg */
int bins; /* Pt/t */
int outputblocks; /* count output blocks for gates */
u_int slowoverthresh; /* slow pool overthreshhold reseed count */
struct pool {
struct source {
u_int bits; /* estimated bits of entropy */
u_int frac; /* fractional bits of entropy
(given as 1024/n) */
} source[ENTROPYSOURCE];
u_int thresh; /* pool reseed threshhold */
struct yarrowhash hash; /* accumulated entropy */
} pool[2]; /* pool[0] is fast, pool[1] is slow */
int which; /* toggle - shows the current insertion pool */
};
extern struct random_state random_state;
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