How to use

// SHA2 test program#include"sha256.h"#include<iostream>// for std::cout only, not needed for hashing libraryintmain(int,char**){// create a new hashing object  SHA256 sha256;// hashing an std::string  std::cout <<sha256("Hello World") << std::endl;// => a591a6d40bf420404a011733cfb7b190d62c65bf0bcda32b57b277d9ad9f146e// hashing a buffer of bytesconstchar* buffer ="How are you";  std::cout <<sha256(buffer,11) << std::endl;// => 9c7d5b046878838da72e40ceb3179580958df544b240869b80d0275cc07209cc// or in a streaming fashion (re-use "How are you")  SHA256 sha256stream;constchar* url ="create.stephan-brumme.com";// 25 bytesint step =5;for (int i =0; i <25; i += step)    sha256stream.add(url + i, step);// add five bytes at a time  std::cout << sha256stream.getHash() << std::endl;// => 82aa771f1183c52f973c798c9243a1c73833ea40961c73e55e12430ec77b69f6return0;}