CryptKeyGenerator.php

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<?php
namespace Magento\Setup\Model;

use Magento\Framework\Config\ConfigOptionsListConstants;
use Magento\Framework\Math\Random;

class CryptKeyGenerator implements CryptKeyGeneratorInterface
{
    private $random;

    public function __construct(Random $random)
    {
        $this->random = $random;
    }

    public function generate()
    {
        return md5($this->getRandomString());
    }

    private function getRandomString()
    {
        return $this->random->getRandomString(ConfigOptionsListConstants::STORE_KEY_RANDOM_STRING_SIZE);
    }
}