1*0957b409SSimon J. Gerraty /*
2*0957b409SSimon J. Gerraty * Copyright (c) 2018 Thomas Pornin <pornin@bolet.org>
3*0957b409SSimon J. Gerraty *
4*0957b409SSimon J. Gerraty * Permission is hereby granted, free of charge, to any person obtaining
5*0957b409SSimon J. Gerraty * a copy of this software and associated documentation files (the
6*0957b409SSimon J. Gerraty * "Software"), to deal in the Software without restriction, including
7*0957b409SSimon J. Gerraty * without limitation the rights to use, copy, modify, merge, publish,
8*0957b409SSimon J. Gerraty * distribute, sublicense, and/or sell copies of the Software, and to
9*0957b409SSimon J. Gerraty * permit persons to whom the Software is furnished to do so, subject to
10*0957b409SSimon J. Gerraty * the following conditions:
11*0957b409SSimon J. Gerraty *
12*0957b409SSimon J. Gerraty * The above copyright notice and this permission notice shall be
13*0957b409SSimon J. Gerraty * included in all copies or substantial portions of the Software.
14*0957b409SSimon J. Gerraty *
15*0957b409SSimon J. Gerraty * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
16*0957b409SSimon J. Gerraty * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
17*0957b409SSimon J. Gerraty * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
18*0957b409SSimon J. Gerraty * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
19*0957b409SSimon J. Gerraty * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
20*0957b409SSimon J. Gerraty * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
21*0957b409SSimon J. Gerraty * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
22*0957b409SSimon J. Gerraty * SOFTWARE.
23*0957b409SSimon J. Gerraty */
24*0957b409SSimon J. Gerraty
25*0957b409SSimon J. Gerraty #include "inner.h"
26*0957b409SSimon J. Gerraty
27*0957b409SSimon J. Gerraty static const unsigned char POINT_LEN[] = {
28*0957b409SSimon J. Gerraty 0, /* 0: not a valid curve ID */
29*0957b409SSimon J. Gerraty 43, /* sect163k1 */
30*0957b409SSimon J. Gerraty 43, /* sect163r1 */
31*0957b409SSimon J. Gerraty 43, /* sect163r2 */
32*0957b409SSimon J. Gerraty 51, /* sect193r1 */
33*0957b409SSimon J. Gerraty 51, /* sect193r2 */
34*0957b409SSimon J. Gerraty 61, /* sect233k1 */
35*0957b409SSimon J. Gerraty 61, /* sect233r1 */
36*0957b409SSimon J. Gerraty 61, /* sect239k1 */
37*0957b409SSimon J. Gerraty 73, /* sect283k1 */
38*0957b409SSimon J. Gerraty 73, /* sect283r1 */
39*0957b409SSimon J. Gerraty 105, /* sect409k1 */
40*0957b409SSimon J. Gerraty 105, /* sect409r1 */
41*0957b409SSimon J. Gerraty 145, /* sect571k1 */
42*0957b409SSimon J. Gerraty 145, /* sect571r1 */
43*0957b409SSimon J. Gerraty 41, /* secp160k1 */
44*0957b409SSimon J. Gerraty 41, /* secp160r1 */
45*0957b409SSimon J. Gerraty 41, /* secp160r2 */
46*0957b409SSimon J. Gerraty 49, /* secp192k1 */
47*0957b409SSimon J. Gerraty 49, /* secp192r1 */
48*0957b409SSimon J. Gerraty 57, /* secp224k1 */
49*0957b409SSimon J. Gerraty 57, /* secp224r1 */
50*0957b409SSimon J. Gerraty 65, /* secp256k1 */
51*0957b409SSimon J. Gerraty 65, /* secp256r1 */
52*0957b409SSimon J. Gerraty 97, /* secp384r1 */
53*0957b409SSimon J. Gerraty 133, /* secp521r1 */
54*0957b409SSimon J. Gerraty 65, /* brainpoolP256r1 */
55*0957b409SSimon J. Gerraty 97, /* brainpoolP384r1 */
56*0957b409SSimon J. Gerraty 129, /* brainpoolP512r1 */
57*0957b409SSimon J. Gerraty 32, /* curve25519 */
58*0957b409SSimon J. Gerraty 56, /* curve448 */
59*0957b409SSimon J. Gerraty };
60*0957b409SSimon J. Gerraty
61*0957b409SSimon J. Gerraty /* see bearssl_ec.h */
62*0957b409SSimon J. Gerraty size_t
br_ec_compute_pub(const br_ec_impl * impl,br_ec_public_key * pk,void * kbuf,const br_ec_private_key * sk)63*0957b409SSimon J. Gerraty br_ec_compute_pub(const br_ec_impl *impl, br_ec_public_key *pk,
64*0957b409SSimon J. Gerraty void *kbuf, const br_ec_private_key *sk)
65*0957b409SSimon J. Gerraty {
66*0957b409SSimon J. Gerraty int curve;
67*0957b409SSimon J. Gerraty size_t len;
68*0957b409SSimon J. Gerraty
69*0957b409SSimon J. Gerraty curve = sk->curve;
70*0957b409SSimon J. Gerraty if (curve < 0 || curve >= 32 || curve >= (int)(sizeof POINT_LEN)
71*0957b409SSimon J. Gerraty || ((impl->supported_curves >> curve) & 1) == 0)
72*0957b409SSimon J. Gerraty {
73*0957b409SSimon J. Gerraty return 0;
74*0957b409SSimon J. Gerraty }
75*0957b409SSimon J. Gerraty if (kbuf == NULL) {
76*0957b409SSimon J. Gerraty return POINT_LEN[curve];
77*0957b409SSimon J. Gerraty }
78*0957b409SSimon J. Gerraty len = impl->mulgen(kbuf, sk->x, sk->xlen, curve);
79*0957b409SSimon J. Gerraty if (pk != NULL) {
80*0957b409SSimon J. Gerraty pk->curve = curve;
81*0957b409SSimon J. Gerraty pk->q = kbuf;
82*0957b409SSimon J. Gerraty pk->qlen = len;
83*0957b409SSimon J. Gerraty }
84*0957b409SSimon J. Gerraty return len;
85*0957b409SSimon J. Gerraty }
86