#include <stdio.h>
#include <QuickHash.h>

#define BUFF_SIZE  1024

int main()
{
    FILE* file;
    unsigned char buff[ BUFF_SIZE ];
    unsigned char context[ SLC_SHA512_CONTEXTSIZE ];
    char digesthex[ SLC_SHA512_HEXDIGESTSIZE ]; /*0 terminated*/

    file = fopen( "c:\\test.txt", "rb" );

    if( file == NULL )
        return 1;

    /*****Initialize the context before calling Update, Final, or FinalHex****/

    SL_SHA512_Init( context );

    /*****Calculate the digest by calling Update for each block of the file***/

    while( !feof( file ) )
    {
        unsigned int nCount = fread( buff, sizeof( char ), BUFF_SIZE, file );
        SL_SHA512_Update( context, buff, nCount );
    }

    /*****Do final changes and get the digest in hex format*******************/

    SL_SHA512_FinalHex( context, digesthex, 0 );

    /*****Use the digest******************************************************/
    /*...*/

    fclose( file );

    return 0;
}