1 /* eddsa-compress-test.c
2
3 Copyright (C) 2014 Niels Möller
4
5 This file is part of GNU Nettle.
6
7 GNU Nettle is free software: you can redistribute it and/or
8 modify it under the terms of either:
9
10 * the GNU Lesser General Public License as published by the Free
11 Software Foundation; either version 3 of the License, or (at your
12 option) any later version.
13
14 or
15
16 * the GNU General Public License as published by the Free
17 Software Foundation; either version 2 of the License, or (at your
18 option) any later version.
19
20 or both in parallel, as here.
21
22 GNU Nettle is distributed in the hope that it will be useful,
23 but WITHOUT ANY WARRANTY; without even the implied warranty of
24 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
25 General Public License for more details.
26
27 You should have received copies of the GNU General Public License and
28 the GNU Lesser General Public License along with this program. If
29 not, see http://www.gnu.org/licenses/.
30 */
31
32 #include "testutils.h"
33
34 #include "eddsa.h"
35 #include "eddsa-internal.h"
36
37 #define COUNT 1000
38
test_main(void)39 void test_main (void)
40 {
41 const struct ecc_curve *ecc = &_nettle_curve25519;
42 gmp_randstate_t rands;
43 mp_size_t size, itch;
44 mpz_t zp, t;
45 mp_limb_t *s;
46 mp_limb_t *p;
47 mp_limb_t *pa1;
48 mp_limb_t *pa2;
49 mp_limb_t *scratch;
50 size_t clen;
51 uint8_t *c;
52 unsigned j;
53
54 gmp_randinit_default (rands);
55
56 size = ecc_size (ecc);
57 clen = 1 + ecc->p.bit_size / 8;
58
59 mpz_roinit_n (zp, ecc->p.m, size);
60
61 mpz_init (t);
62 s = xalloc_limbs (size);
63 p = xalloc_limbs (ecc_size_j (ecc));
64 pa1 = xalloc_limbs (ecc_size_a (ecc));
65 pa2 = xalloc_limbs (ecc_size_a (ecc));
66 c = xalloc (clen);
67
68 itch = _eddsa_decompress_itch (ecc);
69 if (itch < ecc->mul_g_itch)
70 itch = ecc->mul_g_itch;
71
72 scratch = xalloc_limbs (itch);
73
74 for (j = 0; j < COUNT; j++)
75 {
76 mpz_t x1, y1, x2, y2;
77
78 mpz_urandomb (t, rands, ecc->q.bit_size);
79 mpz_limbs_copy (s, t, ecc->q.size);
80 ecc->mul_g (ecc, p, s, scratch);
81 _eddsa_compress (ecc, c, p, scratch);
82 ecc->h_to_a (ecc, 0, pa1, p, scratch);
83 _eddsa_decompress (ecc, pa2, c, scratch);
84 mpz_roinit_n (x1, pa1, size);
85 mpz_roinit_n (y1, pa1 + size, size);
86 mpz_roinit_n (x2, pa2, size);
87 mpz_roinit_n (y2, pa2 + size, size);
88 if (!(mpz_congruent_p (x1, x2, zp)
89 && mpz_congruent_p (y1, y2, zp)))
90 {
91 fprintf (stderr, "eddsa compression failed:\nc = ");
92 print_hex (clen, c);
93 fprintf (stderr, "\np1 = 0x");
94 mpz_out_str (stderr, 16, x1);
95 fprintf (stderr, ",\n 0x");
96 mpz_out_str (stderr, 16, y1);
97 fprintf (stderr, "\np2 = 0x");
98 mpz_out_str (stderr, 16, x2);
99 fprintf (stderr, ",\n 0x");
100 mpz_out_str (stderr, 16, y2);
101 fprintf (stderr, "\n");
102 abort ();
103 }
104 }
105 mpz_clear (t);
106 free (s);
107 free (p);
108 free (c);
109 free (pa1);
110 free (pa2);
111 free (scratch);
112 gmp_randclear (rands);
113 }
114