1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
|
/*
* ecgen, tool for generating Elliptic curve domain parameters
* Copyright (C) 2017 J08nY
*/
#include "curve.h"
#include "exhaustive/seed.h"
#include "field.h"
#include "point.h"
curve_t *curve_new(void) {
curve_t *curve = pari_malloc(sizeof(curve_t));
if (!curve) {
perror("Couldn't malloc.");
exit(1);
}
memset(curve, 0, sizeof(curve_t));
return curve;
}
curve_t *curve_copy(const curve_t *src, curve_t *dest) {
if (src->seed) dest->seed = seed_copy(src->seed, dest->seed);
if (src->field) dest->field = gcopy(src->field);
if (src->a) dest->a = gcopy(src->a);
if (src->b) dest->b = gcopy(src->b);
if (src->curve) dest->curve = gcopy(src->curve);
if (src->order) dest->order = gcopy(src->order);
if (src->generators) {
dest->generators = points_new_copy(src->generators, src->ngens);
dest->ngens = src->ngens;
}
if (src->points) {
dest->points = points_new_copy(src->points, src->npoints);
dest->npoints = src->npoints;
}
return dest;
}
curve_t *curve_new_copy(const curve_t *src) {
curve_t *result = curve_new();
return curve_copy(src, result);
}
curve_t *curve_clone(const curve_t *src, curve_t *dest) {
if (src->seed) dest->seed = seed_clone(src->seed, dest->seed);
if (src->field) dest->field = gclone(src->field);
if (src->a) dest->a = gclone(src->a);
if (src->b) dest->b = gclone(src->b);
if (src->curve) dest->curve = gclone(src->curve);
if (src->order) dest->order = gclone(src->order);
if (src->generators) {
dest->generators = points_new_clone(src->generators, src->ngens);
dest->ngens = src->ngens;
}
if (src->points) {
dest->points = points_new_clone(src->points, src->npoints);
dest->npoints = src->npoints;
}
return dest;
}
curve_t *curve_new_clone(const curve_t *src) {
curve_t *result = curve_new();
return curve_clone(src, result);
}
void curve_free(curve_t **curve) {
if (*curve) {
seed_free(&(*curve)->seed);
if ((*curve)->curve) {
// TODO, this is possibly dangerous...
obj_free((*curve)->curve);
if (isclone((*curve)->curve)) {
gunclone((*curve)->curve);
}
}
if ((*curve)->field && isclone((*curve)->field)) {
gunclone((*curve)->field);
}
if ((*curve)->a && isclone((*curve)->a)) {
gunclone((*curve)->a);
}
if ((*curve)->b && isclone((*curve)->b)) {
gunclone((*curve)->b);
}
if ((*curve)->order && isclone((*curve)->order)) {
gunclone((*curve)->order);
}
points_free_deep(&(*curve)->generators, (*curve)->ngens);
points_free_deep(&(*curve)->points, (*curve)->npoints);
pari_free(*curve);
*curve = NULL;
}
}
int curve_any(curve_t *curve, const config_t *cfg, arg_t *args) {
pari_sp ltop = avma;
GEN v = gen_0;
switch (typ(curve->field)) {
case t_INT:
v = gtovec0(gen_0, 2);
gel(v, 1) = curve->a;
gel(v, 2) = curve->b;
break;
case t_FFELT:
v = gtovec0(gen_0, 5);
gel(v, 1) = gen_1;
gel(v, 2) = curve->a;
gel(v, 4) = curve->b;
break;
default:
pari_err_TYPE("curve_any", curve->field);
}
GEN crv = ellinit(v, curve->field, -1);
if (glength(crv) == 0) {
avma = ltop;
return -3;
} else {
curve->curve = gerepilecopy(ltop, crv);
return 1;
}
}
int curve_nonzero(curve_t *curve, const config_t *cfg, arg_t *args) {
pari_sp ltop = avma;
int any = curve_any(curve, cfg, args);
if (any <= 0) {
return any;
}
if (gequal0(ell_get_disc(curve->curve))) {
avma = ltop;
return -3;
} else {
return 1;
}
}
static int curve_seed_fp(curve_t *curve, const config_t *cfg, arg_t *args) {
// TODO implement
return INT_MIN;
}
static int curve_seed_f2m(curve_t *curve, const config_t *cfg, arg_t *args) {
// TODO implement
return INT_MIN;
}
int curve_seed(curve_t *curve, const config_t *cfg, arg_t *args) {
switch (typ(curve->field)) {
case t_INT:
return curve_seed_fp(curve, cfg, args);
case t_FFELT:
return curve_seed_f2m(curve, cfg, args);
default:
pari_err_TYPE("curve_seed", curve->field);
return INT_MIN; /* NOT REACHABLE */
}
}
int curve_unroll(curve_t *curve, const config_t *cfg, pari_sp from,
pari_sp to) {
if (curve->curve) {
obj_free(curve->curve);
curve->curve = NULL;
}
return -1;
}
GEN curve_params(const curve_t *curve) {
pari_sp ltop = avma;
GEN result = field_params(curve->field);
if (curve->a) result = gconcat(result, field_elementi(curve->a));
if (curve->b) result = gconcat(result, field_elementi(curve->b));
if (curve->generators) {
for (size_t i = 0; i < curve->ngens; ++i) {
GEN x = field_elementi(gel(curve->generators[i]->point, 1));
GEN y = field_elementi(gel(curve->generators[i]->point, 2));
result = gconcat(result, x);
result = gconcat(result, y);
result = gconcat(result, curve->generators[i]->order);
if (curve->generators[i]->cofactor) {
result = gconcat(result, curve->generators[i]->cofactor);
}
}
}
if (curve->order) result = gconcat(result, gtovec(curve->order));
if (curve->points) {
for (size_t i = 0; i < curve->npoints; ++i) {
GEN x = field_elementi(gel(curve->points[i]->point, 1));
GEN y = field_elementi(gel(curve->points[i]->point, 2));
result = gconcat(result, x);
result = gconcat(result, y);
result = gconcat(result, curve->points[i]->order);
if (curve->points[i]->cofactor) {
result = gconcat(result, curve->points[i]->cofactor);
}
}
}
return gerepilecopy(ltop, result);
}
|
