/*	$NetBSD$	*/

/*-
 * Copyright (c) 2015 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Taylor R. Campbell.
 *
 * 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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	_SYS_ENTROPY_H
#define	_SYS_ENTROPY_H

#define	ENTROPY_WAIT	0x01
#define	ENTROPY_SIG	0x02

struct krndsource {
	LIST_ENTRY(krndsource)	rs_list;	/* entry in list of sources */
	struct refcount		rs_refcount;	/* reference count for list and
						 * request callback */
	char			rs_name[16];	/* device name */
	int			rs_type;	/* type, RND_TYPE_* */
	int			rs_flags;	/* flags, RND_FLAG_* */
	int			rs_bad;		/* true if marked bad */
	unsigned		rs_bits;	/* num. entropy bits sourced */
	void			(*rs_request)(size_t, void *);
						/* callback to request more */
	void			*rs_requestarg;	/* cookie for req. callback */
	uint8_t			*rs_cotest;	/* continuous output test */
	uint8_t			rs_cotest_resid;
	rngtest_t		*rs_rngtest;	/* statistical test state for
						 * hardware RNGs */
	unsigned		rs_rngtest_resid;
};

int	entropy_init(void);
void	entropy_seed(void *, size_t);
void	entropy_bootrequest(void);
void	entropy_enter(const void *, size_t, unsigned);
size_t	entropy_enter_intr(const void *, size_t, unsigned);
int	entropy_extract(void *buf, size_t, int);

void	rndsource_setcb(struct krndsource *, void (*)(size_t, void *), void *);
void	rnd_attach_source(struct krndsource *, const char *, int, int);
void	rnd_detach_source(struct krndsource *);
void	rnd_add_uint32(struct krndsource *, uint32_t);
void	rnd_add_data(struct krndsource *, const void *, uint32_t, uint32_t);

#endif	/* _SYS_ENTROPY_H */