text: /*
   * Copyright (C) 2007 Michael Niedermayer <michaelni@gmx.at>
   * Copyright (C) 2013 James Almer <jamrial@gmail.com>
   *
   * This file is part of FFmpeg.
   *
   * FFmpeg is free software; you can redistribute it and/or
   * modify it under the terms of the GNU Lesser General Public
   * License as published by the Free Software Foundation; either
   * version 2.1 of the License, or (at your option) any later version.
   *
   * FFmpeg is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   * Lesser General Public License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with FFmpeg; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
   */
  
  /**
   * @file
   * @ingroup lavu_sha512
   * Public header for SHA-512 implementation.
   */
  
  #ifndef AVUTIL_SHA512_H
  #define AVUTIL_SHA512_H
  
  #include <stddef.h>
  #include <stdint.h>
  
  #include "attributes.h"
  #include "version.h"
  
  /**
   * @defgroup lavu_sha512 SHA-512
   * @ingroup lavu_hash
   * SHA-512 (Secure Hash Algorithm) hash function implementations.
   *
   * This module supports the following SHA-2 hash functions:
   *
   * - SHA-512/224: 224 bits
   * - SHA-512/256: 256 bits
   * - SHA-384: 384 bits
   * - SHA-512: 512 bits
   *
   * @see For SHA-1, SHA-256, and variants thereof, see @ref lavu_sha.
   *
   * @{
   */
  
  extern const int av_sha512_size;
  
  struct AVSHA512;
  
  /**
   * Allocate an AVSHA512 context.
   */
  struct AVSHA512 *av_sha512_alloc(void);
  
  /**
   * Initialize SHA-2 512 hashing.
   *
   * @param context pointer to the function context (of size av_sha512_size)
   * @param bits    number of bits in digest (224, 256, 384 or 512 bits)
   * @return        zero if initialization succeeded, -1 otherwise
   */
  int av_sha512_init(struct AVSHA512* context, int bits);
  
  /**
   * Update hash value.
   *
   * @param context hash function context
   * @param data    input data to update hash with
   * @param len     input data length
   */
  #if FF_API_CRYPTO_SIZE_T
  void av_sha512_update(struct AVSHA512* context, const uint8_t* data, unsigned int len);
  #else
  void av_sha512_update(struct AVSHA512* context, const uint8_t* data, size_t len);
  #endif
  
  /**
   * Finish hashing and output digest value.
   *
   * @param context hash function context
   * @param digest  buffer where output digest value is stored
   */
  void av_sha512_final(struct AVSHA512* context, uint8_t *digest);
  
  /**
   * @}
   */
  
  #endif /* AVUTIL_SHA512_H */
  