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1 | /* ecdsa-keygen.c |
2 | ||
3 | Copyright (C) 2013 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 | */ | |
bf913c73 | 31 | |
f1812845 | 32 | /* Development of Nettle's ECC support was funded by the .SE Internet Fund. */ |
bf913c73 NM |
33 | |
34 | #if HAVE_CONFIG_H | |
35 | # include "config.h" | |
36 | #endif | |
37 | ||
38 | #include <assert.h> | |
39 | #include <stdlib.h> | |
40 | ||
41 | #include "ecdsa.h" | |
42 | #include "ecc-internal.h" | |
43 | #include "nettle-internal.h" | |
44 | ||
45 | void | |
46 | ecdsa_generate_keypair (struct ecc_point *pub, | |
47 | struct ecc_scalar *key, | |
48 | void *random_ctx, nettle_random_func *random) | |
49 | { | |
a5e0d463 | 50 | TMP_DECL(p, mp_limb_t, 3*ECC_MAX_SIZE + ECC_MUL_G_ITCH (ECC_MAX_SIZE)); |
74dea233 | 51 | const struct ecc_curve *ecc = pub->ecc; |
a5e0d463 | 52 | mp_size_t itch = 3*ecc->p.size + ecc->mul_g_itch; |
bf913c73 | 53 | |
74dea233 | 54 | assert (key->ecc == ecc); |
a5e0d463 | 55 | assert (ecc->h_to_a_itch <= ecc->mul_g_itch); |
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56 | |
57 | TMP_ALLOC (p, itch); | |
58 | ||
64b9a7f8 | 59 | ecc_mod_random (&ecc->q, key->p, random_ctx, random, p); |
a78c9459 NM |
60 | ecc->mul_g (ecc, p, key->p, p + 3*ecc->p.size); |
61 | ecc->h_to_a (ecc, 0, pub->p, p, p + 3*ecc->p.size); | |
bf913c73 | 62 | } |