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#include <assert.h>
#include <stdint.h>
#include <sys/ioctl.h>
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <linux/random.h>
#define N 2048
struct entropy {
int ent_count;
int size;
unsigned char data[N];
};
int main() {
struct entropy buf;
ssize_t n;
int random_fd = open("/dev/random", O_RDWR);
assert(random_fd >= 0);
while ((n = read(0, &buf.data, N)) > 0) {
buf.ent_count = n * 8;
buf.size = n;
if (ioctl(random_fd, RNDADDENTROPY, &buf) != 0) {
perror("failed to add entropy");
}
}
return 0;
}
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