_ Git - BearSSL/blob - inc/bearssl_prf.h

   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 #ifndef BR_BEARSSL_PRF_H__
  26 #define BR_BEARSSL_PRF_H__
  27
  28 #include <stddef.h>
  29 #include <stdint.h>
  30
  31 /*
  32  * The TLS PRF
  33  * -----------
  34  *
  35  * TLS 1.0 and 1.1 define a PRF that is based on both MD5 and SHA-1. This
  36  * is implemented by the br_tls10_prf() function.
  37  *
  38  * TLS 1.2 redefines the PRF, using an explicit hash function. The
  39  * br_tls12_sha256_prf() and br_tls12_sha384_prf() functions apply that
  40  * PRF with, respectively, SHA-256 and SHA-384.
  41  *
  42  * The PRF always uses as input three parameters: a "secret" (some
  43  * bytes), a "label" (ASCII string), and a "seed" (again some bytes).
  44  * An arbitrary output length can be produced.
  45  */
  46
  47 void br_tls10_prf(void *dst, size_t len,
  48         const void *secret, size_t secret_len,
  49         const char *label, const void *seed, size_t seed_len);
  50
  51 void br_tls12_sha256_prf(void *dst, size_t len,
  52         const void *secret, size_t secret_len,
  53         const char *label, const void *seed, size_t seed_len);
  54
  55 void br_tls12_sha384_prf(void *dst, size_t len,
  56         const void *secret, size_t secret_len,
  57         const char *label, const void *seed, size_t seed_len);
  58
  59 /*
  60  * A convenient type name for a PRF implementation.
  61  */
  62 typedef void (*br_tls_prf_impl)(void *dst, size_t len,
  63         const void *secret, size_t secret_len,
  64         const char *label, const void *seed, size_t seed_len);
  65
  66 #endif