2 * Copyright (c) 2016 Thomas Pornin <pornin@bolet.org>
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:
12 * The above copyright notice and this permission notice shall be
13 * included in all copies or substantial portions of the Software.
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
27 /* see bearssl_rsa.h */
29 br_rsa_ssl_decrypt(br_rsa_private core
, const br_rsa_private_key
*sk
,
30 unsigned char *data
, size_t len
)
36 * A first check on length. Since this test works only on the
37 * buffer length, it needs not (and cannot) be constant-time.
39 if (len
< 59 || len
!= (sk
->n_bitlen
+ 7) >> 3) {
44 x
&= EQ(data
[0], 0x00);
45 x
&= EQ(data
[1], 0x02);
46 for (u
= 2; u
< (len
- 49); u
++) {
49 x
&= EQ(data
[len
- 49], 0x00);
50 memmove(data
, data
+ len
- 48, 48);