fprintf(stderr, "Usage: %s [options] private_key_file public_key_file\n\n", program_name);
fprintf(stderr, "Valid options are:\n"
" --help Display this help and exit.\n"
fprintf(stderr, "Usage: %s [options] private_key_file public_key_file\n\n", program_name);
fprintf(stderr, "Valid options are:\n"
" --help Display this help and exit.\n"