1 /*
2  * Copyright (c) 2018 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 /* see bearssl_rsa.h */
28 uint32_t
29 br_rsa_i32_pss_vrfy(const unsigned char *x, size_t xlen,
30 	const br_hash_class *hf_data, const br_hash_class *hf_mgf1,
31 	const void *hash, size_t salt_len, const br_rsa_public_key *pk)
32 {
33 	unsigned char sig[BR_MAX_RSA_SIZE >> 3];
34 
35 	if (xlen > (sizeof sig)) {
36 		return 0;
37 	}
38 	memcpy(sig, x, xlen);
39 	if (!br_rsa_i32_public(sig, xlen, pk)) {
40 		return 0;
41 	}
42 	return br_rsa_pss_sig_unpad(hf_data, hf_mgf1,
43 		hash, salt_len, pk, sig);
44 }
45