File Coverage

src/ec/ec_pubkey.c
Criterion Covered Total %
statement 12 13 92.3
branch 7 12 58.3
condition n/a
subroutine n/a
pod n/a
total 19 25 76.0


line stmt bran cond sub pod time code
1             /*
2             * Copyright (c) 2018 Thomas Pornin
3             *
4             * Permission is hereby granted, free of charge, to any person obtaining
5             * a copy of this software and associated documentation files (the
6             * "Software"), to deal in the Software without restriction, including
7             * without limitation the rights to use, copy, modify, merge, publish,
8             * distribute, sublicense, and/or sell copies of the Software, and to
9             * permit persons to whom the Software is furnished to do so, subject to
10             * the following conditions:
11             *
12             * The above copyright notice and this permission notice shall be
13             * included in all copies or substantial portions of the Software.
14             *
15             * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
16             * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
17             * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
18             * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
19             * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
20             * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
21             * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
22             * SOFTWARE.
23             */
24              
25             #include "inner.h"
26              
27             static const unsigned char POINT_LEN[] = {
28             0, /* 0: not a valid curve ID */
29             43, /* sect163k1 */
30             43, /* sect163r1 */
31             43, /* sect163r2 */
32             51, /* sect193r1 */
33             51, /* sect193r2 */
34             61, /* sect233k1 */
35             61, /* sect233r1 */
36             61, /* sect239k1 */
37             73, /* sect283k1 */
38             73, /* sect283r1 */
39             105, /* sect409k1 */
40             105, /* sect409r1 */
41             145, /* sect571k1 */
42             145, /* sect571r1 */
43             41, /* secp160k1 */
44             41, /* secp160r1 */
45             41, /* secp160r2 */
46             49, /* secp192k1 */
47             49, /* secp192r1 */
48             57, /* secp224k1 */
49             57, /* secp224r1 */
50             65, /* secp256k1 */
51             65, /* secp256r1 */
52             97, /* secp384r1 */
53             133, /* secp521r1 */
54             65, /* brainpoolP256r1 */
55             97, /* brainpoolP384r1 */
56             129, /* brainpoolP512r1 */
57             32, /* curve25519 */
58             56, /* curve448 */
59             };
60              
61             /* see bearssl_ec.h */
62             size_t
63 4           br_ec_compute_pub(const br_ec_impl *impl, br_ec_public_key *pk,
64             void *kbuf, const br_ec_private_key *sk)
65             {
66             int curve;
67             size_t len;
68              
69 4           curve = sk->curve;
70 4 50         if (curve < 0 || curve >= 32 || curve >= (int)(sizeof POINT_LEN)
    50          
    50          
71 4 50         || ((impl->supported_curves >> curve) & 1) == 0)
72             {
73 0           return 0;
74             }
75 4 100         if (kbuf == NULL) {
76 2           return POINT_LEN[curve];
77             }
78 2           len = impl->mulgen(kbuf, sk->x, sk->xlen, curve);
79 2 50         if (pk != NULL) {
80 2           pk->curve = curve;
81 2           pk->q = kbuf;
82 2           pk->qlen = len;
83             }
84 2           return len;
85             }