text: /**
   * Copyright (c) 2016 - 2019, Nordic Semiconductor ASA
   *
   * 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, except as embedded into a Nordic
   *    Semiconductor ASA integrated circuit in a product or a software update for
   *    such product, 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.
   *
   * 3. Neither the name of Nordic Semiconductor ASA nor the names of its
   *    contributors may be used to endorse or promote products derived from this
   *    software without specific prior written permission.
   *
   * 4. This software, with or without modification, must only be used with a
   *    Nordic Semiconductor ASA integrated circuit.
   *
   * 5. Any software provided in binary form under this license must not be reverse
   *    engineered, decompiled, modified and/or disassembled.
   *
   * THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
   * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA 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.
   *
   */
  
  /**@file
   * SHA-1 is a cryptographic hash function designed by the NSA.
   *
   * A fixed-sized message digest is computed from input data with arbitrary
   * length. The function is practically impossible to revert, and small changes
   * in the input message lead to major changes in the message digest.
   *
   * SHA-1 is no longer considered secure against well-funded opponents;
   * replacement by SHA-2 or SHA-3 is recommended.
   */
  
  #ifndef OCC_SHA1_H
  #define OCC_SHA1_H
  
  #include <stdint.h>
  #include <stddef.h>
  
  
  /**
   * Length of SHA-1 hash.
   */
  #define occ_sha1_BYTES (20)
  
  
  /**
   * SHA-1 hash.
   *
   * The SHA-1 hash of a given input message @p in is computed and put into @p r.
   *
   * **Example**
   * @include occ_sha1.c
   *
   * @param[out] r      Generated hash.
   * @param      in     Input data.
   * @param      in_len Length of @p in.
   */
  void occ_sha1(uint8_t r[occ_sha1_BYTES],
                const uint8_t *in, size_t in_len);
  
  #endif
  