static void
do_init(void)
{
uint8_t sha1[SHA1_DIGEST_SIZE];
struct sha1_ctx sha1_ctx;
uint8_t random_seed[16];
struct timeval now;
/* Get seed data. */
get_entropy_or_die(random_seed, sizeof random_seed);
xgettimeofday(&now);
/* Convert seed into key. */
sha1_init(&sha1_ctx);
sha1_update(&sha1_ctx, random_seed, sizeof random_seed);
sha1_update(&sha1_ctx, &now, sizeof now);
sha1_update_int(&sha1_ctx, getpid());
#ifndef _WIN32
sha1_update_int(&sha1_ctx, getppid());
sha1_update_int(&sha1_ctx, getuid());
sha1_update_int(&sha1_ctx, getgid());
#endif
sha1_final(&sha1_ctx, sha1);
/* Generate key. */
BUILD_ASSERT(sizeof sha1 >= 16);
aes128_schedule(&key, sha1);
/* Generate initial counter. */
get_entropy_or_die(counter, sizeof counter);
}
void
random_init(void)
{
uint32_t *seedp = seed_get();
while (!*seedp) {
struct timeval tv;
uint32_t entropy;
pthread_t self;
xgettimeofday(&tv);
get_entropy_or_die(&entropy, 4);
self = pthread_self();
*seedp = (tv.tv_sec ^ tv.tv_usec ^ entropy
^ hash_bytes(&self, sizeof self, 0));
}
}
