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
29 br_tls_phash(void *dst
, size_t len
,
30 const br_hash_class
*dig
,
31 const void *secret
, size_t secret_len
, const char *label
,
32 size_t seed_num
, const br_tls_prf_seed_chunk
*seed
)
35 unsigned char tmp
[64], a
[64];
36 br_hmac_key_context kc
;
38 size_t label_len
, hlen
, u
;
44 for (label_len
= 0; label
[label_len
]; label_len
++);
45 hlen
= br_digest_size(dig
);
46 br_hmac_key_init(&kc
, dig
, secret
, secret_len
);
47 br_hmac_init(&hc
, &kc
, 0);
48 br_hmac_update(&hc
, label
, label_len
);
49 for (u
= 0; u
< seed_num
; u
++) {
50 br_hmac_update(&hc
, seed
[u
].data
, seed
[u
].len
);
54 br_hmac_init(&hc
, &kc
, 0);
55 br_hmac_update(&hc
, a
, hlen
);
56 br_hmac_update(&hc
, label
, label_len
);
57 for (u
= 0; u
< seed_num
; u
++) {
58 br_hmac_update(&hc
, seed
[u
].data
, seed
[u
].len
);
60 br_hmac_out(&hc
, tmp
);
61 for (u
= 0; u
< hlen
&& u
< len
; u
++) {
69 br_hmac_init(&hc
, &kc
, 0);
70 br_hmac_update(&hc
, a
, hlen
);