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/*
* Copyright (c) 2016 Thomas Pornin <pornin@bolet.org>
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include "inner.h"
/* see inner.h */
void
br_tls_phash(void *dst, size_t len,
const br_hash_class *dig,
const void *secret, size_t secret_len, const char *label,
size_t seed_num, const br_tls_prf_seed_chunk *seed)
{
unsigned char *buf;
unsigned char tmp[64], a[64];
br_hmac_key_context kc;
br_hmac_context hc;
size_t label_len, hlen, u;
if (len == 0) {
return;
}
buf = dst;
for (label_len = 0; label[label_len]; label_len ++);
hlen = br_digest_size(dig);
br_hmac_key_init(&kc, dig, secret, secret_len);
br_hmac_init(&hc, &kc, 0);
br_hmac_update(&hc, label, label_len);
for (u = 0; u < seed_num; u ++) {
br_hmac_update(&hc, seed[u].data, seed[u].len);
}
br_hmac_out(&hc, a);
for (;;) {
br_hmac_init(&hc, &kc, 0);
br_hmac_update(&hc, a, hlen);
br_hmac_update(&hc, label, label_len);
for (u = 0; u < seed_num; u ++) {
br_hmac_update(&hc, seed[u].data, seed[u].len);
}
br_hmac_out(&hc, tmp);
for (u = 0; u < hlen && u < len; u ++) {
buf[u] ^= tmp[u];
}
buf += u;
len -= u;
if (len == 0) {
return;
}
br_hmac_init(&hc, &kc, 0);
br_hmac_update(&hc, a, hlen);
br_hmac_out(&hc, a);
}
}
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