text: // Copyright (c) 2017 GuangCoin Developers
  // Distributed under the MIT software license, see the accompanying
  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
  
  #ifndef BITCOIN_CRYPTO_BLAKE2_CLASS_H
  #define BITCOIN_CRYPTO_BLAKE2_CLASS_H
  
  #include <stdint.h>
  #include <stdlib.h>
  #include "blake2.h"
  
  
  //int blake2b_init( blake2b_state *S, size_t outlen );
  //  int blake2b_init_key( blake2b_state *S, size_t outlen, const void *key, size_t keylen );
  //  int blake2b_init_param( blake2b_state *S, const blake2b_param *P );
  //  int blake2b_update( blake2b_state *S, const void *in, size_t inlen );
  //  int blake2b_final( blake2b_state *S, void *out, size_t outlen );
  
  /** A hasher class for Blake 2 (224). */
  class CBLAKE2224
  {
  private:
      blake2b_state s;
      //unsigned char buf[64];
      uint64_t bytes;
  
  public:
      static const size_t OUTPUT_SIZE = 28;
  
      CBLAKE2224();
      CBLAKE2224& Write(const unsigned char* data, size_t len);
      void Finalize(unsigned char hash[OUTPUT_SIZE]);
      CBLAKE2224& Reset();
  };
  
  #endif // BITCOIN_CRYPTO_RIPEMD160_H
  