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To: zeriyoshi <zeriyoshi@gmail.com>, "internals@lists.php.net"
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Thread-Topic: [PHP-DEV] Re: Improving PRNG implementation.
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Date: Tue, 22 Dec 2020 15:40:56 +0000
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Subject: Re: [PHP-DEV] Re: Improving PRNG implementation.
From: tysonandre775@hotmail.com (tyson andre)

Hi=A0Go Kudo,=0A=
=0A=
**A possible alternative that is widely used in other programming languages=
 is to limit the interface API to only generating bytes/integers,**=0A=
and to provide global functions that would use generic random number genera=
tor objects (from internal or user-provided code) in their algorithms.=0A=
=0A=
This would also make it easier to use those generators in brand new algorit=
hms that weren't in the initial RFC.=0A=
(or in algorithms written by users in PHP)=0A=
=0A=
This alternative is similar to Java https://docs.oracle.com/javase/7/docs/a=
pi/java/util/Collections.html#shuffle(java.util.List,%20java.util.Random)=
=0A=
and https://docs.oracle.com/javase/7/docs/api/java/util/Random.html=0A=
and C++ https://www.cplusplus.com/reference/algorithm/shuffle/=0A=
where the algorithms accept a random number generator conforming to some in=
terface=0A=
and Python https://docs.python.org/3/library/random.html#random.shuffle=0A=
=0A=
```=0A=
interface PRNGInterface { =0A=
    public function random[Signed]Int(): int;  // between PHP_INT_MIN and P=
HP_INT_MAX (4 bytes or 8 bytes)=0A=
    public function randomBytes(int $length): string // $length bytes of ra=
w data=0A=
    // possibly randomByte(): int // between 0 and 255=0A=
    // public function randomIntInRange(int $min, int $max)=0A=
    // __serialize(), __unserialize() may be provided, but may be counterpr=
oductive for classes that wrap /dev/urandom or random_bytes()?=0A=
}=0A=
// possibly provide a trait that provides defaults based on abstract functi=
on randomInt=0A=
=0A=
function whateverprefixornamespace_rand(PRNGInterface $rng, [int $min, int =
$max]): int {}=0A=
// If this is intended to be secure, whateverprefix_array_rand may need to =
avoid the optimizations used by array_rand for sparse arrays=0A=
function whateverprefixornamespace_array_rand(PRNGInterface $rng, array $ar=
ray, ...): int {}=0A=
function whateverprefixornamespace_shuffle(PRNGInterface $rng, array &$arra=
y): bool;=0A=
// alternately might be possible by extending existing global functions wit=
h an optional parameter=0A=
```=0A=
=0A=
Thanks,=0A=
- Tyson=