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/*-
 * Copyright 2009 Colin Percival
 * Copyright 2013-2018 Alexander Peslyak
 * All rights reserved.
 *
 * 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 AUTHOR 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 AUTHOR 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.
 *
 * This file was originally written by Colin Percival as part of the Tarsnap
 * online backup system.
 */
#ifndef _YESCRYPT_H_
#define _YESCRYPT_H_

#include <stdint.h>
#include <stdlib.h> /* for size_t */

#ifdef __cplusplus
extern "C" {
#endif

/**
 * crypto_scrypt(passwd, passwdlen, salt, saltlen, N, r, p, buf, buflen):
 * Compute scrypt(passwd[0 .. passwdlen - 1], salt[0 .. saltlen - 1], N, r,
 * p, buflen) and write the result into buf.  The parameters r, p, and buflen
 * must satisfy r * p < 2^30 and buflen <= (2^32 - 1) * 32.  The parameter N
 * must be a power of 2 greater than 1.
 *
 * Return 0 on success; or -1 on error.
 *
 * MT-safe as long as buf is local to the thread.
 */
extern int crypto_scrypt(const uint8_t *passwd, size_t passwdlen,
    const uint8_t *salt, size_t saltlen,
    uint64_t N, uint32_t r, uint32_t p, uint8_t *buf, size_t buflen);

/**
 * Internal type used by the memory allocator.  Please do not use it directly.
 * Use yescrypt_shared_t and yescrypt_local_t as appropriate instead, since
 * they might differ from each other in a future version.
 */
typedef struct {
	void *base, *aligned;
	size_t base_size, aligned_size;
} yescrypt_region_t;

/**
 * Types for shared (ROM) and thread-local (RAM) data structures.
 */
typedef yescrypt_region_t yescrypt_shared_t;
typedef yescrypt_region_t yescrypt_local_t;

/**
 * Two 64-bit tags placed 48 bytes to the end of a ROM in host byte endianness
 * (and followed by 32 bytes of the ROM digest).
 */
#define YESCRYPT_ROM_TAG1 0x7470797263736579ULL /* "yescrypt" */
#define YESCRYPT_ROM_TAG2 0x687361684d4f522dULL /* "-ROMhash" */

/**
 * Type and possible values for the flags argument of yescrypt_kdf(),
 * yescrypt_encode_params_r(), yescrypt_encode_params().  Most of these may be
 * OR'ed together, except that YESCRYPT_WORM stands on its own.
 * Please refer to the description of yescrypt_kdf() below for the meaning of
 * these flags.
 */
typedef uint32_t yescrypt_flags_t;
/* Public */
#define YESCRYPT_WORM			1
#define YESCRYPT_RW			0x002