/*      $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 */