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/*
* ecgen, tool for generating Elliptic curve domain parameters
* Copyright (C) 2017 J08nY
*/
#include "point.h"
point_t *point_new(void) {
point_t *point = pari_malloc(sizeof(point_t));
if (!point) {
perror("Couldn't malloc.");
exit(1);
}
memset(point, 0, sizeof(point_t));
return point;
}
point_t *point_copy(const point_t *src, point_t *dest) {
if (src->point) dest->point = gcopy(src->point);
if (src->order) dest->order = gcopy(src->order);
if (src->cofactor) dest->cofactor = gcopy(src->cofactor);
return dest;
}
void point_free(point_t **point) {
if (*point) {
pari_free(*point);
*point = NULL;
}
}
point_t **points_new(size_t num) {
point_t **points = pari_malloc(num * sizeof(point_t *));
if (!points) {
perror("Couldn't malloc.");
exit(1);
}
memset(points, 0, num * sizeof(point_t *));
return points;
}
point_t **points_copy(point_t **src, point_t **dest, size_t num) {
for (size_t i = 0; i < num; ++i) {
dest[i] = point_new();
dest[i] = point_copy(src[i], dest[i]);
}
return dest;
}
void points_free(point_t ***points) {
if (*points) {
pari_free(*points);
*points = NULL;
}
}
void points_free_deep(point_t ***points, size_t npoints) {
if (*points) {
for (size_t i = 0; i < npoints; ++i) {
point_free(&(*points)[i]);
}
points_free(points);
}
}
int point_random(curve_t *curve, config_t *cfg, arg_t *args) {
points_free_deep(&curve->points, curve->npoints);
point_t *p = point_new();
p->point = genrand(curve->curve);
p->order = ellorder(curve->curve, p->point, NULL);
curve->points = points_new(1);
curve->points[0] = p;
curve->npoints = 1;
return 1;
}
int points_random(curve_t *curve, config_t *cfg, arg_t *args) {
if (!args) {
fprintf(stderr, "No args to an arged function. points_random");
return INT_MIN;
}
points_free_deep(&curve->points, curve->npoints);
size_t npoints = *(size_t *)args->args;
curve->points = points_new(npoints);
curve->npoints = npoints;
for (size_t i = 0; i < npoints; ++i) {
point_t *p = point_new();
p->point = genrand(curve->curve);
p->order = ellorder(curve->curve, p->point, NULL);
curve->points[i] = p;
}
return 1;
}
/*
GEN o = utoi(dprimes[i]);
GEN mul = ellmul(curve->curve, rand, o);
if (gequal0(mul)) {
printf("Success! %lu\n", npoints);
curve->points[i] = point_new();
gerepileall(btop, 2, &rand, &o);
curve->points[i]->point = rand;
curve->points[i]->order = o;
npoints++;
break;
}
*/
int points_trial(curve_t *curve, config_t *cfg, arg_t *args) {
// TODO stack code!!!
if (!args) {
fprintf(stderr, "No args to an arged function. points_trial");
return INT_MIN;
}
points_free_deep(&curve->points, curve->npoints);
pari_ulong *primes = (pari_ulong *)args->args;
size_t nprimes = args->nargs;
curve->points = points_new(nprimes);
curve->npoints = nprimes;
size_t npoints = 0;
while (npoints < nprimes) {
GEN rand = genrand(curve->curve);
GEN ord = ellorder(curve->curve, rand, NULL);
for (long i = 0; i < nprimes; ++i) {
if (curve->points[i] == NULL && dvdis(ord, primes[i])) {
pari_sp ftop = avma;
GEN p = stoi(primes[i]);
GEN mul = divii(ord, p);
GEN point = ellmul(curve->curve, rand, mul);
curve->points[i] = point_new();
gerepileall(ftop, 2, &point, &p);
curve->points[i]->point = point;
curve->points[i]->order = p;
npoints++;
}
}
}
return 1;
}
int points_prime(curve_t *curve, config_t *cfg, arg_t *args) {
// TODO stack code!!!
points_free_deep(&curve->points, curve->npoints);
GEN factors = Z_factor(curve->order);
GEN primes = gel(factors, 1);
long nprimes = glength(primes);
curve->points = points_new((size_t)nprimes);
curve->npoints = (size_t)nprimes;
long npoints = 0;
while (npoints < nprimes) {
GEN rand = genrand(curve->curve);
GEN ord = ellorder(curve->curve, rand, NULL);
// ord(rand) = ord
for (long i = 1; i <= nprimes; ++i) {
if (curve->points[i - 1] == NULL && dvdii(ord, gel(primes, i))) {
pari_sp ftop = avma;
// primes[i] divides ord
// mul = ord/primes[i]
GEN p = gcopy(gel(primes, i));
GEN mul = divii(ord, p);
GEN point = ellmul(curve->curve, rand, mul);
curve->points[i - 1] = point_new();
gerepileall(ftop, 2, &point, &p);
curve->points[i - 1]->point = point;
curve->points[i - 1]->order = p;
npoints++;
}
}
}
return 1;
}
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