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/*
* Copyright (c) 2018 Thomas Pornin <pornin@bolet.org>
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include "inner.h"
static const unsigned char POINT_LEN[] = {
0, /* 0: not a valid curve ID */
43, /* sect163k1 */
43, /* sect163r1 */
43, /* sect163r2 */
51, /* sect193r1 */
51, /* sect193r2 */
61, /* sect233k1 */
61, /* sect233r1 */
61, /* sect239k1 */
73, /* sect283k1 */
73, /* sect283r1 */
105, /* sect409k1 */
105, /* sect409r1 */
145, /* sect571k1 */
145, /* sect571r1 */
41, /* secp160k1 */
41, /* secp160r1 */
41, /* secp160r2 */
49, /* secp192k1 */
49, /* secp192r1 */
57, /* secp224k1 */
57, /* secp224r1 */
65, /* secp256k1 */
65, /* secp256r1 */
97, /* secp384r1 */
133, /* secp521r1 */
65, /* brainpoolP256r1 */
97, /* brainpoolP384r1 */
129, /* brainpoolP512r1 */
32, /* curve25519 */
56, /* curve448 */
};
/* see bearssl_ec.h */
size_t
br_ec_compute_pub(const br_ec_impl *impl, br_ec_public_key *pk,
void *kbuf, const br_ec_private_key *sk)
{
int curve;
size_t len;
curve = sk->curve;
if (curve < 0 || curve >= 32 || curve >= (int)(sizeof POINT_LEN)
|| ((impl->supported_curves >> curve) & 1) == 0)
{
return 0;
}
if (kbuf == NULL) {
return POINT_LEN[curve];
}
len = impl->mulgen(kbuf, sk->x, sk->xlen, curve);
if (pk != NULL) {
pk->curve = curve;
pk->q = kbuf;
pk->qlen = len;
}
return len;
}
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