/*      $NetBSD: entpool.h,v 1.1 2020/04/30 03:28:19 riastradh Exp $    */

/*-
 * Copyright (c) 2019 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 ENTPOOL_H
#define ENTPOOL_H

#include <sys/types.h>
#include <sys/endian.h>

#if defined(_KERNEL) || defined(_STANDALONE)
#include <sys/stdbool.h>
#else
#include <stdbool.h>
#endif

#if ENTPOOL_SMALL
#define ENTPOOL_HEADER          <gimli.h>
#define ENTPOOL_PERMUTE         gimli
#define ENTPOOL_SIZE            48
#define ENTPOOL_WORD            uint32_t
#define ENTPOOL_WTOH            le32toh
#define ENTPOOL_HTOW            htole32
#define ENTPOOL_SECURITY        16
#else
#define ENTPOOL_HEADER          <keccak.h>
#define ENTPOOL_PERMUTE         keccakf1600
#define ENTPOOL_SIZE            200
#define ENTPOOL_WORD            uint64_t
#define ENTPOOL_WTOH            le64toh
#define ENTPOOL_HTOW            htole64
#define ENTPOOL_SECURITY        16
#endif

#define ENTPOOL_CAPACITY        (2*ENTPOOL_SECURITY)
#define ENTPOOL_RATE            (ENTPOOL_SIZE - ENTPOOL_CAPACITY)

struct entpool {
        union {
                uint8_t         u8[ENTPOOL_SIZE];
                ENTPOOL_WORD    w[ENTPOOL_SIZE/sizeof(ENTPOOL_WORD)];
        }               s;
        unsigned        i;
};

int     entpool_selftest(void);
void    entpool_enter(struct entpool *, const void *, size_t);
bool    entpool_enter_nostir(struct entpool *, const void *, size_t);
void    entpool_stir(struct entpool *);
void    entpool_extract(struct entpool *, void *, size_t);

#endif  /* ENTPOOL_H */