Re: [PHP-DEV] xoshiro** edge case (all zeros)

2022-08-04 Thread Tim Düsterhus 

Hi

On 8/4/22 22:32, Hans Henrik Bergan wrote:

dangerous to be sure, but it's also a technically valid seed,
are you sure we should disallow a valid seed?


The all-zero state is not a valid state as per the reference 
implementation at: https://xoshiro.di.unimi.it/xoshiro256starstar.c


> The state must be seeded so that it is not everywhere zero.

The period of Xoshiro256** is officially defined to be 2**256 - 1 
instead of 2**256 for that reason.


Best regards
Tim Düsterhus

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Re: [PHP-DEV] xoshiro** edge case (all zeros)

2022-08-04 Thread Anton Smirnov 
On Thu, 2022-08-04 at 22:32 +0200, Hans Henrik Bergan wrote:
> dangerous to be sure, but it's also a technically valid seed,
> are you sure we should disallow a valid seed?

Reference implementation defines it as invalid:
https://prng.di.unimi.it/xoshiro256starstar.c

Some implementations choose to seed the RNG with 0x...0001 but that
kinda inroduces bias

> On Thu, 4 Aug 2022 at 20:33, Tim Düsterhus  wrote:
> > Hi
> > 
> > On 8/4/22 10:09, Anton Smirnov wrote:
> > > xoshiro** has a known edge case: all-zero seed
> > 
> > Indeed, good catch. I had that in mind, but forgot about it.
> > 
> > >  > > 
> > > $engine = new \Random\Engine\Xoshiro256StarStar(str_repeat("\0",
> > > 32));
> > > 
> > > while (true) {
> > >       echo hex2bin($engine->generate()), PHP_EOL; //
> > > 
> > > }
> > > 
> > > It should be documented and/or handled
> > > 
> > > It's only for a string seed, int seed is not affected
> > > 
> > 
> > I've created a PR here:
> > 
> > https://github.com/php/php-src/pull/9250
> > 
> > I've opted to throw a ValueError in that case, as that's the only
> > safe 
> > option that does not introduce a bias.
> > 
> > The 32xNUL seed basically should only happen for manually written 
> > testing input and not happen otherwise. An actual random seed will 
> > result in 32 NUL bytes with just a 2**-256 chance and when relying
> > on 
> > the implicit CSPRNG seeding (`null` as seed parameter) my PR will
> > just 
> > retry to catch even that edge case.
> > 
> > Best regards
> > Tim Düsterhus
> > 

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Re: [PHP-DEV] xoshiro** edge case (all zeros)

2022-08-04 Thread Jordan LeDoux 
On Thu, Aug 4, 2022 at 1:33 PM Hans Henrik Bergan 
wrote:

> dangerous to be sure, but it's also a technically valid seed,
> are you sure we should disallow a valid seed?
>
>
How is it a valid seed if it creates invalid outputs?

Re: [PHP-DEV] xoshiro** edge case (all zeros)

2022-08-04 Thread Hans Henrik Bergan 
dangerous to be sure, but it's also a technically valid seed,
are you sure we should disallow a valid seed?

On Thu, 4 Aug 2022 at 20:33, Tim Düsterhus  wrote:

> Hi
>
> On 8/4/22 10:09, Anton Smirnov wrote:
> > xoshiro** has a known edge case: all-zero seed
>
> Indeed, good catch. I had that in mind, but forgot about it.
>
> >  >
> > $engine = new \Random\Engine\Xoshiro256StarStar(str_repeat("\0", 32));
> >
> > while (true) {
> >  echo hex2bin($engine->generate()), PHP_EOL; // 
> > }
> >
> > It should be documented and/or handled
> >
> > It's only for a string seed, int seed is not affected
> >
>
> I've created a PR here:
>
> https://github.com/php/php-src/pull/9250
>
> I've opted to throw a ValueError in that case, as that's the only safe
> option that does not introduce a bias.
>
> The 32xNUL seed basically should only happen for manually written
> testing input and not happen otherwise. An actual random seed will
> result in 32 NUL bytes with just a 2**-256 chance and when relying on
> the implicit CSPRNG seeding (`null` as seed parameter) my PR will just
> retry to catch even that edge case.
>
> Best regards
> Tim Düsterhus
>
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> PHP Internals - PHP Runtime Development Mailing List
> To unsubscribe, visit: https://www.php.net/unsub.php
>
>

Re: [PHP-DEV] xoshiro** edge case (all zeros)

2022-08-04 Thread Tim Düsterhus 

Hi

On 8/4/22 10:09, Anton Smirnov wrote:

xoshiro** has a known edge case: all-zero seed


Indeed, good catch. I had that in mind, but forgot about it.


generate()), PHP_EOL; // 
}

It should be documented and/or handled

It's only for a string seed, int seed is not affected



I've created a PR here:

https://github.com/php/php-src/pull/9250

I've opted to throw a ValueError in that case, as that's the only safe 
option that does not introduce a bias.


The 32xNUL seed basically should only happen for manually written 
testing input and not happen otherwise. An actual random seed will 
result in 32 NUL bytes with just a 2**-256 chance and when relying on 
the implicit CSPRNG seeding (`null` as seed parameter) my PR will just 
retry to catch even that edge case.


Best regards
Tim Düsterhus

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Re: [PHP-DEV] xoshiro** edge case (all zeros)

2022-08-04 Thread Go Kudo 
2022年8月4日(木) 17:10 Anton Smirnov :

> Hi!
>
> Randomness again. Sorry if I just missed some relevant discussion
>
> xoshiro** has a known edge case: all-zero seed
>
> 
> $engine = new \Random\Engine\Xoshiro256StarStar(str_repeat("\0", 32));
>
> while (true) {
> echo hex2bin($engine->generate()), PHP_EOL; // 
> }
>
> It should be documented and/or handled
>
> It's only for a string seed, int seed is not affected
>
> --
> Anton
>
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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

[PHP-DEV] PHP 8.1.9 Released

2022-08-04 Thread Patrick ALLAERT 
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA512

The PHP development team announces the immediate availability of PHP 8.1.9.
This is a bugfix release.

All PHP 8.1 users are encouraged to upgrade to this version.

For source downloads of PHP 8.1.9 please visit our downloads page. Windows
binaries can be found on the PHP for Windows site. The list of changes is
recorded in the ChangeLog.

Release Announcement: 
Downloads:
Windows downloads:
Changelog:
Release Manifest:


Many thanks to all the contributors and supporters!

Patrick Allaert, Ben Ramsey & Joe Watkins

php-8.1.9.tar.bz2
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- -Patrick
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[PHP-DEV] PHP 8.2.0 Beta 2 available for testing

2022-08-04 Thread Sergey Panteleev 
PHP 8.2.0beta2 has just been released and can be downloaded from:

https://downloads.php.net/~sergey

or

https://qa.php.net/

or use the git tag: php-8.2.0beta2

Windows binaries are available at: https://windows.php.net/qa/#php-8.2

Please test it carefully, and report any bugs to
https://github.com/php/php-src/issues

8.2.0beta3 should be expected in 2 weeks, i.e. on August 18th 2022.

Hash values and PGP signatures can be found below or at
https://gist.github.com/saundefined/1540f44aa0f70fd37bb71817db37c47a

Thank you, and happy testing!

Regards,
Pierrick Charron, Sergey Panteleev & Ben Ramsey


php-8.2.0beta2.tar.bz2
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[PHP-DEV] PHP 8.0.22 Released

2022-08-04 Thread Gabriel Caruso 
The PHP development team announces the immediate availability of PHP
8.0.22. This is a bugfix release.

All PHP 8.0 users are encouraged to upgrade to this version.

For source downloads of PHP 8.0.2 please visit our downloads page.
Windows binaries can be found on the PHP for Windows site.
The list of changes is recorded in the ChangeLog.

Release Announcement: 
Downloads:
Windows downloads:
Changelog:
Release Manifest: <
https://gist.github.com/carusogabriel/c9c6dca833bf132d4421158a351e2525>

Many thanks to all the contributors and supporters!

Gabriel Caruso & Sara Golemon

php-8.0.22.tar.gz
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[PHP-DEV] xoshiro** edge case (all zeros)

2022-08-04 Thread Anton Smirnov 
Hi!

Randomness again. Sorry if I just missed some relevant discussion

xoshiro** has a known edge case: all-zero seed

generate()), PHP_EOL; // 
}

It should be documented and/or handled

It's only for a string seed, int seed is not affected

-- 
Anton

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