1  /*
 2   * Copyright (c) 2016 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_i31_pkcs1_vrfy(const unsigned char *x, size_t xlen,
30  	const unsigned char *hash_oid, size_t hash_len,
31  	const br_rsa_public_key *pk, unsigned char *hash_out)
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_i31_public(sig, xlen, pk)) {
40  		return 0;
41  	}
42  	return br_rsa_pkcs1_sig_unpad(sig, xlen, hash_oid, hash_len, hash_out);
43  }