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
|
#include "testutils.h"
static void
ref_mod (mp_limb_t *rp, const mp_limb_t *ap, const mp_limb_t *mp, mp_size_t mn)
{
mpz_t r, a, m;
mpz_init (r);
mpz_mod (r, mpz_roinit_n (a, ap, 2*mn), mpz_roinit_n (m, mp, mn));
mpz_limbs_copy (rp, r, mn);
mpz_clear (r);
}
#define MAX_ECC_SIZE (1 + 521 / GMP_NUMB_BITS)
#define MAX_SIZE (2*MAX_ECC_SIZE)
#define COUNT 50000
static void
test_modulo (gmp_randstate_t rands, const char *name,
const struct ecc_modulo *m)
{
mp_limb_t a[MAX_SIZE];
mp_limb_t t[MAX_SIZE];
mp_limb_t ref[MAX_SIZE];
mpz_t r;
unsigned j;
mpz_init (r);
for (j = 0; j < COUNT; j++)
{
if (j & 1)
mpz_rrandomb (r, rands, 2*m->size * GMP_NUMB_BITS);
else
mpz_urandomb (r, rands, 2*m->size * GMP_NUMB_BITS);
mpz_limbs_copy (a, r, 2*m->size);
ref_mod (ref, a, m->m, m->size);
mpn_copyi (t, a, 2*m->size);
m->mod (m, t);
if (mpn_cmp (t, m->m, m->size) >= 0)
mpn_sub_n (t, t, m->m, m->size);
if (mpn_cmp (t, ref, m->size))
{
fprintf (stderr, "m->mod %s failed: bit_size = %u\n",
name, m->bit_size);
fprintf (stderr, "a = ");
mpn_out_str (stderr, 16, a, 2*m->size);
fprintf (stderr, "\nt = ");
mpn_out_str (stderr, 16, t, m->size);
fprintf (stderr, " (bad)\nref = ");
mpn_out_str (stderr, 16, ref, m->size);
fprintf (stderr, "\n");
abort ();
}
if (m->B_size < m->size)
{
mpn_copyi (t, a, 2*m->size);
ecc_mod (m, t);
if (mpn_cmp (t, m->m, m->size) >= 0)
mpn_sub_n (t, t, m->m, m->size);
if (mpn_cmp (t, ref, m->size))
{
fprintf (stderr, "ecc_mod %s failed: bit_size = %u\n",
name, m->bit_size);
fprintf (stderr, "a = ");
mpn_out_str (stderr, 16, a, 2*m->size);
fprintf (stderr, "\nt = ");
mpn_out_str (stderr, 16, t, m->size);
fprintf (stderr, " (bad)\nref = ");
mpn_out_str (stderr, 16, ref, m->size);
fprintf (stderr, "\n");
abort ();
}
}
}
mpz_clear (r);
}
void
test_main (void)
{
gmp_randstate_t rands;
unsigned i;
gmp_randinit_default (rands);
for (i = 0; ecc_curves[i]; i++)
{
test_modulo (rands, "p", &ecc_curves[i]->p);
test_modulo (rands, "q", &ecc_curves[i]->q);
}
gmp_randclear (rands);
}
|
