text: /*
   * Copyright (C) 2015 Southern Storm Software, Pty Ltd.
   *
   * Permission is hereby granted, free of charge, to any person obtaining a
   * copy of this software and associated documentation files (the "Software"),
   * to deal in the Software without restriction, including without limitation
   * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   * and/or sell copies of the Software, and to permit persons to whom the
   * Software is furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included
   * in all copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
   * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
   * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
   * DEALINGS IN THE SOFTWARE.
   */
  
  #ifndef CRYPTO_SHA512_h
  #define CRYPTO_SHA512_h
  
  #include "Hash.h"
  
  class Ed25519;
  
  class SHA512 : public Hash
  {
  public:
      SHA512();
      virtual ~SHA512();
  
      size_t hashSize() const;
      size_t blockSize() const;
  
      void reset();
      void update(const void *data, size_t len);
      void finalize(void *hash, size_t len);
  
      void clear();
  
      void resetHMAC(const void *key, size_t keyLen);
      void finalizeHMAC(const void *key, size_t keyLen, void *hash, size_t hashLen);
  
  private:
      struct {
          uint64_t h[8];
          uint64_t w[16];
          uint64_t lengthLow;
          uint64_t lengthHigh;
          uint8_t chunkSize;
      } state;
  
      void processChunk();
  
      friend class Ed25519;
  };
  
  #endif
  