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/* $OpenBSD: rndvar.h,v 1.21 2008/06/09 07:07:16 djm Exp $ */
/*
* Copyright (c) 1996,2000 Michael Shalayeff.
*
* This software derived from one contributed by Theodore Ts'o.
*
* 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.
* 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 REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
*
*/
#ifndef __RNDVAR_H__
#define __RNDVAR_H__
#define POOLWORDS 2048 /* Power of 2 - note that this is 32-bit words */
#define RND_RND 0 /* real randomness like nuclear chips */
#define RND_SRND 1 /* strong random source */
#define RND_URND 2 /* less strong random source */
#define RND_PRND 3 /* pseudo random source */
#define RND_ARND 4 /* aRC4 based random number generator */
#define RND_NODEV 5 /* First invalid minor device number */
#define RND_SRC_TRUE 0
#define RND_SRC_TIMER 1
#define RND_SRC_MOUSE 2
#define RND_SRC_TTY 3
#define RND_SRC_DISK 4
#define RND_SRC_NET 5
#define RND_SRC_AUDIO 6
#define RND_SRC_VIDEO 7
#define RND_SRC_NUM 8
struct rndstats {
quad_t rnd_total; /* total bits of entropy generated */
quad_t rnd_used; /* strong data bits read so far */
quad_t rnd_reads; /* strong read calls */
quad_t arc4_reads; /* aRC4 data bytes read so far */
quad_t arc4_nstirs; /* arc4 pool stirs */
quad_t arc4_stirs; /* arc4 pool stirs (bits used) */
quad_t rnd_pad[5];
quad_t rnd_waits; /* sleeps for data */
quad_t rnd_enqs; /* enqueue calls */
quad_t rnd_deqs; /* dequeue calls */
quad_t rnd_drops; /* queue-full drops */
quad_t rnd_drople; /* queue low watermark low entropy drops */
quad_t rnd_ed[32]; /* entropy feed distribution */
quad_t rnd_sc[RND_SRC_NUM]; /* add* calls */
quad_t rnd_sb[RND_SRC_NUM]; /* add* bits */
};
#ifdef _KERNEL
extern struct rndstats rndstats;
#define add_true_randomness(d) enqueue_randomness(RND_SRC_TRUE, (int)(d))
#define add_timer_randomness(d) enqueue_randomness(RND_SRC_TIMER, (int)(d))
#define add_mouse_randomness(d) enqueue_randomness(RND_SRC_MOUSE, (int)(d))
#define add_tty_randomness(d) enqueue_randomness(RND_SRC_TTY, (int)(d))
#define add_disk_randomness(d) enqueue_randomness(RND_SRC_DISK, (int)(d))
#define add_net_randomness(d) enqueue_randomness(RND_SRC_NET, (int)(d))
#define add_audio_randomness(d) enqueue_randomness(RND_SRC_AUDIO, (int)(d))
#define add_video_randomness(d) enqueue_randomness(RND_SRC_VIDEO, (int)(d))
void enqueue_randomness(int, int);
void get_random_bytes(void *, size_t);
void arc4random_buf(void *, size_t);
u_int32_t arc4random(void);
u_int32_t arc4random_uniform(u_int32_t);
#endif /* _KERNEL */
#endif /* __RNDVAR_H__ */
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