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/*-
 * Copyright 2009 Colin Percival
 * 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.
 */
#include "scrypt_platform.h"

#include <assert.h>
#include <inttypes.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "crypto_aes.h"
#include "crypto_aesctr.h"
#include "crypto_entropy.h"
#include "humansize.h"
#include "insecure_memzero.h"
#include "sha256.h"
#include "sysendian.h"

#include "crypto_scrypt.h"
#include "memlimit.h"
#include "scryptenc_cpuperf.h"

#include "scryptenc.h"

#define ENCBLOCK 65536

static int pickparams(size_t, double, double,
    int *, uint32_t *, uint32_t *, int);
static int checkparams(size_t, double, double, int, uint32_t, uint32_t, int,
    int);

static void
display_params(int logN, uint32_t r, uint32_t p, size_t memlimit,
    double opps, double maxtime)
{
	uint64_t N = (uint64_t)(1) << logN;
	uint64_t mem_minimum = 128 * r * N;
	double expected_seconds = 4 * N * p / opps;
	char * human_memlimit = humansize(memlimit);
	char * human_mem_minimum = humansize(mem_minimum);

	fprintf(stderr, "Parameters used: N = %" PRIu64 "; r = %" PRIu32
	    "; p = %" PRIu32 ";\n", N, r, p);
	fprintf(stderr, "    This requires at least %s bytes of memory "
	    "(%s available),\n", human_mem_minimum, human_memlimit);
	fprintf(stderr, "    and will take approximately %.1f seconds "
	    "(limit: %.1f seconds).\n", expected_seconds, maxtime);

	free(human_memlimit);
	free(human_mem_minimum);
}

static int
pickparams(size_t maxmem, double maxmemfrac, double maxtime,
    int * logN, uint32_t * r, uint32_t * p, int verbose)
{
	size_t memlimit;
	double opps;
	double opslimit;
	double maxN, maxrp;