xoshiro** edge case (all zeros)
| From: | Anton Smirnov | Date: | Thu, 04 Aug 2022 08:09:52 +0000 |
| Subject: | xoshiro** edge case (all zeros) | ||
| Groups: | php.internals | ||
| Request: | Send a blank email to internals+get-118343@lists.php.net to get a copy of this message | ||
Hi!
Randomness again. Sorry if I just missed some relevant discussion
xoshiro** has a known edge case: all-zero seed
<?php
$engine = new \Random\Engine\Xoshiro256StarStar(str_repeat("\0", 32));
while (true) {
echo hex2bin($engine->generate()), PHP_EOL; // 0000000000000000
}
It should be documented and/or handled
It's only for a string seed, int seed is not affected
--
Anton