1 /*
2  * Copyright (c) 2017 Thomas Pornin <pornin@bolet.org>
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 #define ORDER_LEN   ((BR_MAX_EC_SIZE + 7) >> 3)
28 
29 /* see bearssl_ec.h */
30 size_t
31 br_ecdsa_i15_sign_asn1(const br_ec_impl *impl,
32 	const br_hash_class *hf, const void *hash_value,
33 	const br_ec_private_key *sk, void *sig)
34 {
35 	unsigned char rsig[(ORDER_LEN << 1) + 12];
36 	size_t sig_len;
37 
38 	sig_len = br_ecdsa_i15_sign_raw(impl, hf, hash_value, sk, rsig);
39 	if (sig_len == 0) {
40 		return 0;
41 	}
42 	sig_len = br_ecdsa_raw_to_asn1(rsig, sig_len);
43 	memcpy(sig, rsig, sig_len);
44 	return sig_len;
45 }
46