#include <fstream>
#include <QuickHash.h>

using namespace std;
using namespace QuickHash;

const unsigned int BUFF_SIZE = 1024;

int main()
{
    fstream file( "c:\\test.txt", ios::in | ios::binary );

    if( !file )
        return 1;

    unsigned char buff[ BUFF_SIZE ];
    unsigned char hmac[ CHMAC<CSHA1>::DIGESTSIZE ]; 

    char key[] = "My Password";

    //Instantiate a CHMAC object that uses SHA1 hash algorithm

    CHMAC<CSHA1> hm( (const unsigned char*)key, strlen( key ) );

    //Calculate the HMAC incrementally block by block using Update

    while( !file.eof() )
    {
        file.read( ( char* )buff, BUFF_SIZE );
        hm.Update( buff, file.gcount() );
    }

    //Do final changes and get the HMAC

    hm.Final( hmac );

    //Use the HMAC
    //...

    file.close();

    return 0;
}