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<?php declare(strict_types=1); namespace Psl\SecureRandom; use Exception as PHPException; use Psl\Str; use Psl\Type; use function random_bytes; /** * Returns a cryptographically secure random bytes. * * @param int<0, max> $length The number of bytes to generate. * * @throws Exception\InsufficientEntropyException If it was not possible to gather sufficient entropy. * * @psalm-external-mutation-free */ function bytes(int $length): string { if (0 === $length) { return ''; } try { /** @var int<1, max> $length */ return random_bytes($length); // @codeCoverageIgnoreStart } catch (PHPException $e) { $code = $e->getCode(); if (Type\string()->matches($code)) { $code = Str\to_int($code) ?? 0; } throw new Exception\InsufficientEntropyException('Unable to gather sufficient entropy.', $code, $e); // @codeCoverageIgnoreEnd } }
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