if ( encryption ) {
        while ( fscanf(input,"%c",(char*)&c) == 1 ) { // Do encryption
            c = c + 200;
            c = c << 2;
            fprintf(output,"%x ", c);
        }
    } else {
        while ( fscanf(input,"%x ",&c) == 1 )  { // Do decryption
            c = c >> 2;
            c = c - 200;
            fprintf(output,"%c", c);
        }
    }

    return EXIT_SUCCESS;
}