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/*
* ecgen, tool for generating Elliptic curve domain parameters
* Copyright (C) 2017 J08nY
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
/**
* @author J08nY <johny@neuromancer.sk>
* @license GPL v2.0
* @version 0.2
*/
#include <time.h>
#include "cli.h"
#include "field.h"
#include "curve.h"
#include "output.h"
const char *argp_program_version = "ecgen 0.2\n"
"Copyright (C) 2017 J08nY\n"
"License GPLv2: GNU GPL version 2 (or later) <http://gnu.org/licenses/gpl.html>\n"
"This is free software: you are free to change and redistribute it.\n"
"There is NO WARRANTY, to the extent permitted by law.";
const char *argp_program_bug_address = "<johny@neuromancer.sk>";
static struct argp argp = {options, parse_opt, args_doc, doc};
static struct arguments args;
static FILE *in;
static FILE *out;
bool init() {
// Init PARI, 1GB stack, 1M primes
pari_init(1000000000, 1000000);
init_gp();
// Init PARI PRNG
pari_ulong seed = 0;
// Try urandom first
FILE *rand = fopen("/dev/urandom", "rb");
if (rand) {
fread(&seed, sizeof(char), sizeof(pari_ulong), rand);
fclose(rand);
}
// Try worse methods later
if (seed == 0) {
struct timespec t;
if (!clock_gettime(CLOCK_REALTIME, &t)) {
seed = (pari_ulong) t.tv_nsec;
} else {
seed = (pari_ulong) time(NULL);
}
}
pari_sp ltop = avma;
setrand(utoi(seed));
avma = ltop;
//set datadir if specified
if (args.datadir) {
default0("datadir", args.datadir);
}
//open outfile
out = stdout;
if (args.output) {
out = fopen(args.output, args.append ? "a" : "w");
if (!out) {
//fallback to stdout and output err
out = stdout;
perror("Failed to open output file.");
}
}
//open infile
in = stdin;
if (args.input) {
in = fopen(args.input, "r");
if (!in) {
//fallback to stdin or quit?
in = stdin;
perror("Failed to open input file.");
}
}
return true;
}
int quit(int status) {
pari_close();
if (out != NULL && out != stdout) {
fclose(out);
}
if (in != NULL && in != stdout) {
fclose(in);
}
return status;
}
int main(int argc, char *argv[]) {
// Parse cli args
memset(&args, 0, sizeof(args));
argp_parse(&argp, argc, argv, 0, 0, &args);
if (!init()) {
return quit(1);
}
if (args.random) {
GEN field = gen_0;
switch (args.field) {
case FIELD_PRIME:
field = field_primer(args.bits);
break;
case FIELD_BINARY:
field = field_binaryr(args.bits);
break;
}
GEN curve = curve_random(field);
GEN ord = ellcard(curve, NULL);
GEN f = field_params(field);
GEN a = gtovec(field_elementi(ell_get_a4(curve)));
GEN b = gtovec(field_elementi(ell_get_a6(curve)));
GEN o = gconcat(gconcat(gconcat(f, a), b), gtovec(ord));
output_csv(out, ',', 'x', o);
} else {
fprintf(stderr, "Currently unsupported.");
}
return quit(0);
}
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