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