Re: xoshiro** edge case (all zeros)
| From: | Go Kudo | Date: | Thu, 04 Aug 2022 16:14:43 +0000 |
| Subject: | Re: xoshiro** edge case (all zeros) | ||
| References: | 1 | Groups: | php.internals |
| Request: | Send a blank email to internals+get-118347@lists.php.net to get a copy of this message | ||
2022年8月4日(木) 17:10 Anton Smirnov <sandfox@sandfox.me>:
> 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
>
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> PHP Internals - PHP Runtime Development Mailing List
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>
Hi.
Thanks for the report! This is dangerous behavior and we will attempt to
fix it for 8.2beta3.
Best regards
Go Kudo