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00d6edf90c
A single program that invokes getrandom() repeatedly should end up with the same stream of bytes, regardless of how it chunks up the reading from the entropy source. This test already passses. I'm including it because it seems like a useful confirmation.
41 lines
887 B
C
41 lines
887 B
C
#include <stdio.h>
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#include <stdlib.h>
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#include <sys/random.h>
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void usage(const char* name) {
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fprintf(stderr,
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"Usage: %s REPS SIZE\n\n"
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"Gather and print REPS blocks of SIZE bytes from getrandom()\n",
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name);
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}
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int main(int argc, const char **argv) {
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int reps, size;
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unsigned char *buf;
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if (argc != 3) {
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usage(argv[0]);
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return 1;
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}
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reps = atoi(argv[1]);
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size = atoi(argv[2]);
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buf = malloc(size);
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if (!buf) {
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fprintf(stderr, "failure to allocate buffer of size %d\n", size);
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return 1;
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}
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for (int i = 0; i < reps; i++) {
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ssize_t resp = getrandom(buf, size, 0);
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if (resp != size) {
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fprintf(stderr, "tried to get %d bytes, got %zd\n", size, resp);
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free(buf);
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return 2;
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}
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for (int j = 0; j < size; j++) {
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printf("%02x", buf[j]);
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}
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}
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free(buf);
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printf("\n");
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return 0;
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};
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