/*	$OpenBSD: rndvar.h,v 1.12 2000/03/19 17:38:03 mickey Exp $	*/

/*
 * Copyright (c) 1996 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by Theodore Ts'o.
 * 4. Neither the name of the University nor of the Laboratory may be used
 *    to endorse or promote products derived from this software without
 *    specific prior written permission.
 *
 * 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 128    /* 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 */

struct rndstats {
	u_long rnd_total; /* total bits of entropy generated */
	u_long rnd_used;  /* strong data bits read so far */
	u_long arc4_reads;/* aRC4 data bytes read so far */

	u_long rnd_timer; /* timer calls */
	u_long rnd_mouse; /* mouse calls */
	u_long rnd_tty;   /* tty calls */
	u_long rnd_disk;  /* block devices calls */
	u_long rnd_net;   /* net calls */

	u_long rnd_reads; /* strong read calls */
	u_long rnd_waits; /* sleep for data */
	u_long rnd_enqs;  /* enqueue calls */
	u_long rnd_deqs;  /* dequeue calls */
	u_long rnd_drops; /* queue-full drops */
	u_long rnd_drople;/* queue low watermark low entropy drops */

	u_long rnd_asleep;/* sleeping for the data */
	u_long rnd_queued;/* queued for processing */
	u_long arc4_stirs;/* arc4 pool stirs */

	u_long rnd_ed[32];/* entropy feed distribution */
};

#ifdef _KERNEL
extern struct rndstats rndstats;

extern void add_mouse_randomness __P((u_int32_t));
extern void add_net_randomness __P((int));
extern void add_disk_randomness __P((u_int32_t));
extern void add_tty_randomness __P((int));

extern void get_random_bytes __P((void *, size_t));
extern u_int32_t arc4random __P((void));
extern int arc4random_8 __P((void));

#endif /* _KERNEL */

#endif /* __RNDVAR_H__ */