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