text: #ifdef HAVE_CONFIG_H
  #include "config.h"
  #endif
  #ifdef  VANILLA_NACL /* toxcore only uses this when libsodium is unavailable */
  
  /*-
   * Copyright 2005,2007,2009 Colin Percival
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   *
   */
  
  #ifndef _SHA256_H_
  #define _SHA256_H_
  
  #include <sys/types.h>
  
  #include <stdint.h>
  
  #include "crypto_auth_hmacsha256.h"
  
  /**
   * PBKDF2_SHA256(passwd, passwdlen, salt, saltlen, c, buf, dkLen):
   * Compute PBKDF2(passwd, salt, c, dkLen) using HMAC-SHA256 as the PRF, and
   * write the output to buf.  The value dkLen must be at most 32 * (2^32 - 1).
   */
  void PBKDF2_SHA256(const uint8_t *, size_t, const uint8_t *, size_t,
                     uint64_t, uint8_t *, size_t);
  
  #endif /* !_SHA256_H_ */
  
  #endif
  