release/src/router/nettle/pbkdf2-hmac-sha256.c

   1 /* pbkdf2-hmac-sha256.c
   2  *
   3  * PKCS #5 PBKDF2 used with HMAC-SHA256, see RFC 2898.
   4  */
   5
   6 /* nettle, low-level cryptographics library
   7  *
   8  * Copyright (C) 2012 Simon Josefsson
   9  *
  10  * The nettle library is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU Lesser General Public License as published by
  12  * the Free Software Foundation; either version 2.1 of the License, or (at your
  13  * option) any later version.
  14  *
  15  * The nettle library is distributed in the hope that it will be useful, but
  16  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  17  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
  18  * License for more details.
  19  *
  20  * You should have received a copy of the GNU Lesser General Public License
  21  * along with the nettle library; see the file COPYING.LIB.  If not, write to
  22  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  23  * MA 02111-1301, USA.
  24  */
  25
  26 #if HAVE_CONFIG_H
  27 # include "config.h"
  28 #endif
  29
  30 #include "pbkdf2.h"
  31
  32 #include "hmac.h"
  33
  34 void
  35 pbkdf2_hmac_sha256 (unsigned key_length, const uint8_t *key,
  36                   unsigned iterations,
  37                   unsigned salt_length, const uint8_t *salt,
  38                   unsigned length, uint8_t *dst)
  39 {
  40   struct hmac_sha256_ctx sha256ctx;
  41
  42   hmac_sha256_set_key (&sha256ctx, key_length, key);
  43   PBKDF2 (&sha256ctx, hmac_sha256_update, hmac_sha256_digest,
  44           SHA256_DIGEST_SIZE, iterations, salt_length, salt, length, dst);
  45 }