blob: 78481f41439b3f933bf12607631c0c9e5cdccf28 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
|
/*
* ecgen, tool for generating Elliptic curve domain parameters
* Copyright (C) 2017-2018 J08nY
*/
#include "twists.h"
void curve_twist_rand(curve_t *to, const curve_t *of) {
to->field = gcopy(of->field);
GEN v = elltwist(of->curve, NULL);
to->curve = ellinit(v, to->field, -1);
if (typ(of->field) == t_INT) {
to->a = ell_get_a4(to->curve);
to->b = ell_get_a6(to->curve);
} else if (typ(of->field) == t_FFELT) {
to->a = ell_get_a2(to->curve);
to->b = ell_get_a6(to->curve);
}
}
|
