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#include <stdio.h>
#include <stdlib.h>
#include <sys/random.h>
void usage(const char* name) {
fprintf(stderr,
"Usage: %s REPS SIZE\n\n"
"Gather and print REPS blocks of SIZE bytes from getrandom()\n",
name);
}
int main(int argc, const char **argv) {
int reps, size;
unsigned char *buf;
if (argc != 3) {
usage(argv[0]);
return 1;
}
reps = atoi(argv[1]);
size = atoi(argv[2]);
buf = malloc(size);
if (!buf) {
fprintf(stderr, "failure to allocate buffer of size %d\n", size);
return 1;
}
for (int i = 0; i < reps; i++) {
ssize_t resp = getrandom(buf, size, 0);
if (resp != size) {
fprintf(stderr, "tried to get %d bytes, got %zd\n", size, resp);
free(buf);
return 2;
}
for (int j = 0; j < size; j++) {
printf("%02x", buf[j]);
}
}
free(buf);
printf("\n");
return 0;
};
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