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
br_rsa_i31_oaep_decrypt(const br_hash_class * dig,const void * label,size_t label_len,const br_rsa_private_key * sk,void * data,size_t * len)29 br_rsa_i31_oaep_decrypt(const br_hash_class *dig,
30 const void *label, size_t label_len,
31 const br_rsa_private_key *sk, void *data, size_t *len)
32 {
33 uint32_t r;
34
35 if (*len != ((sk->n_bitlen + 7) >> 3)) {
36 return 0;
37 }
38 r = br_rsa_i31_private(data, sk);
39 r &= br_rsa_oaep_unpad(dig, label, label_len, data, len);
40 return r;
41 }
42