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/* Copyright (c) 2016-2020, The Tor Project, Inc. */
/* See LICENSE for licensing information */
/*
* Example usage:
*
* ./src/test/test-rng --emit | dieharder -g 200 -a
*
* Remember, dieharder can tell you that your RNG is completely broken, but if
* your RNG is not _completely_ broken, dieharder cannot tell you whether your
* RNG is actually secure.
*/
#include "orconfig.h"
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include "lib/crypt_ops/crypto_rand.h"
int
main(int argc, char **argv)
{
uint8_t buf[0x123];
if (argc != 2 || strcmp(argv[1], "--emit")) {
fprintf(stderr, "If you want me to fill stdout with a bunch of random "
"bytes, you need to say --emit.\n");
return 1;
}
if (crypto_seed_rng() < 0) {
fprintf(stderr, "Can't seed RNG.\n");
return 1;
}
#if 0
while (1) {
crypto_rand(buf, sizeof(buf));
if (write(1 /*stdout*/, buf, sizeof(buf)) != sizeof(buf)) {
fprintf(stderr, "write() failed: %s\n", strerror(errno));
return 1;
}
}
#endif /* 0 */
crypto_fast_rng_t *rng = crypto_fast_rng_new();
while (1) {
crypto_fast_rng_getbytes(rng, buf, sizeof(buf));
if (write(1 /*stdout*/, buf, sizeof(buf)) != sizeof(buf)) {
fprintf(stderr, "write() failed: %s\n", strerror(errno));
return 1;
}
}
}
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