_ Git - BearSSL/blob - src/ssl/prf_md5sha1.c

   1 /*
   2  * Copyright (c) 2016 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.h */
  28 void
  29 br_tls10_prf(void *dst, size_t len,
  30         const void *secret, size_t secret_len, const char *label,
  31         size_t seed_num, const br_tls_prf_seed_chunk *seed)
  32 {
  33         const unsigned char *s1;
  34         size_t slen;
  35
  36         s1 = secret;
  37         slen = (secret_len + 1) >> 1;
  38         memset(dst, 0, len);
  39         br_tls_phash(dst, len, &br_md5_vtable,
  40                 s1, slen, label, seed_num, seed);
  41         br_tls_phash(dst, len, &br_sha1_vtable,
  42                 s1 + secret_len - slen, slen, label, seed_num, seed);
  43 }