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1 | /* sec-sub-1.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 | */ | |
9422a551 | 31 | |
f1812845 | 32 | /* Development of Nettle's ECC support was funded by the .SE Internet Fund. */ |
9422a551 NM |
33 | |
34 | #if HAVE_CONFIG_H | |
35 | # include "config.h" | |
36 | #endif | |
37 | ||
38 | #include "ecc-internal.h" | |
39 | ||
40 | mp_limb_t | |
41 | sec_sub_1 (mp_limb_t *rp, mp_limb_t *ap, mp_size_t n, mp_limb_t b) | |
42 | { | |
43 | mp_size_t i; | |
44 | for (i = 0; i < n; i++) | |
45 | { | |
46 | mp_limb_t a; | |
47 | a = ap[i]; | |
48 | rp[i] = a - b; | |
49 | b = a < b; | |
50 | } | |
51 | return b; | |
52 | } |