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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
/// compute SHA256 hash
/** Usage:
SHA256 sha256;
std::string myHash = sha256("Hello World"); // std::string
std::string myHash2 = sha256("How are you", 11); // arbitrary data, 11 bytes
// or in a streaming fashion:
SHA256 sha256;
while (more data available)
sha256.add(pointer to fresh data, number of new bytes);
std::string myHash3 = sha256.getHash();
*/
class SHA256 //: public Hash
{
public:
/// split into 64 byte blocks (=> 512 bits), hash is 32 bytes long
enum { BlockSize = 512 / 8, HashBytes = 32 };
/// same as reset()
SHA256();
/// compute SHA256 of a memory block
std::string operator()(const void* data, size_t numBytes);
/// compute SHA256 of a string, excluding final zero
std::string operator()(const std::string& text);
/// add arbitrary number of bytes
void add(const void* data, size_t numBytes);
/// return latest hash as 64 hex characters
std::string getHash();
/// return latest hash as bytes
void getHash(unsigned char buffer[HashBytes]);
/// restart
void reset();
private:
/// process 64 bytes
void processBlock(const void* data);
/// process everything left in the internal buffer
void processBuffer();
/// size of processed data in bytes
uint64_t m_numBytes;
/// valid bytes in m_buffer
size_t m_bufferSize;
/// bytes not processed yet
uint8_t m_buffer[BlockSize];
enum { HashValues = HashBytes / 4 };
/// hash, stored as integers
uint32_t m_hash[HashValues];
};
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