Random.php

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<?php
namespace Magento\Framework\Math;

use Magento\Framework\Exception\LocalizedException;
use Magento\Framework\Phrase;

class Random
{
    const CHARS_LOWERS = 'abcdefghijklmnopqrstuvwxyz';

    const CHARS_UPPERS = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';

    const CHARS_DIGITS = '0123456789';

    public function getRandomString($length, $chars = null)
    {
        $str = '';
        if (null === $chars) {
            $chars = self::CHARS_LOWERS.self::CHARS_UPPERS.self::CHARS_DIGITS;
        }

        $charsMaxKey = mb_strlen($chars) - 1;
        for ($i = 0; $i < $length; $i++) {
            $str .= $chars[self::getRandomNumber(0, $charsMaxKey)];
        }

        return $str;
    }

    public static function getRandomNumber($min = 0, $max = null)
    {
        if (null === $max) {
            $max = mt_getrandmax();
        }

        if ($max < $min) {
            throw new LocalizedException(new Phrase('Invalid range given.'));
        }

        return random_int($min, $max);
    }

    public function getUniqueHash($prefix = '')
    {
        return $prefix . $this->getRandomString(32);
    }
}