sha256.h

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// //////////////////////////////////////////////////////////
// sha256.h
// Copyright (c) 2014,2015 Stephan Brumme. All rights reserved.
// see http://create.stephan-brumme.com/disclaimer.html
//
 
#pragma once
 
//#include "hash.h"
#include <string>
 
// define fixed size integer types
#ifdef _MSC_VER
// Windows
typedef unsigned __int8  uint8_t;
typedef unsigned __int32 uint32_t;
typedef unsigned __int64 uint64_t;
#else
// GCC
#include <stdint.h>
#endif
 
// Added namespace to avoid clash with OpenSSL
namespace hash {


class SHA256 //: public Hash
{
public:
  enum { BlockSize = 512 / 8, HashBytes = 32 };

  SHA256();

  std::string operator()(const void* data, size_t numBytes);
  std::string operator()(const std::string& text);

  void add(const void* data, size_t numBytes);

  std::string getHash();
  void        getHash(unsigned char buffer[HashBytes]);

  void reset();
 
private:
  void processBlock(const void* data);
  void processBuffer();

  uint64_t m_numBytes;
  size_t   m_bufferSize;
  uint8_t  m_buffer[BlockSize];
 
  enum { HashValues = HashBytes / 4 };
  uint32_t m_hash[HashValues];
};
 
} // namespace hash