#include <stdio.h>
#include <errno.h>
#include <fcntl.h>
#include <assert.h>


int create_keyfile(const char *filename)
{
	int fd = open(filename, O_WRONLY|O_CREAT|O_EXCL, 0600);
	int rand = open("/dev/urandom", O_RDONLY);
	char matrix[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789._";
	unsigned char n;
	int i;

	assert(sizeof(matrix) == 65);
	if ( fd == -1 ) {
		fprintf(stderr, "Can't create key file: %d\n", strerror(errno));
		return 1;
	}
	if ( rand == -1 ) {
		fprintf(stderr, "Can't open /dev/urandom: %d\n", strerror(errno));
		return 1;
	}
	for (i=0; i<64; i++) {
		read(rand, &n, 1);
		write(fd, matrix+(n&63), 1);
		//write(fd, matrix+(n%64), 1);
	}
	write(fd, "\n", 1);
	close(rand);
	close(fd);
	return 0;
}

int main(int argc, char ** argv)
{
	//create_keyfile("test");

	if (argc!=2)
	{
		printf("[!] USAGE:\t\tcsync2-key FILENAME\n");
	}
	else
	{
		create_keyfile(argv[1]);
	}
	


	return 0;
}