Crypt.php

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<?php
declare(strict_types=1);

namespace Magento\Framework\Encryption;

class Crypt
{
    protected $_cipher;

    protected $_mode;

    protected $_initVector;

    private $mcrypt;

    public function __construct(
        $key,
        $cipher = MCRYPT_BLOWFISH,
        $mode = MCRYPT_MODE_ECB,
        $initVector = false
    ) {
        if (true === $initVector) {
            // @codingStandardsIgnoreStart
            $handle = @mcrypt_module_open($cipher, '', $mode, '');
            $initVectorSize = @mcrypt_enc_get_iv_size($handle);
            // @codingStandardsIgnoreEnd

            /* Generate a random vector from human-readable characters */
            $allowedCharacters = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
            $initVector = '';
            for ($i = 0; $i < $initVectorSize; $i++) {
                $initVector .= $allowedCharacters[rand(0, strlen($allowedCharacters) - 1)];
            }
            // @codingStandardsIgnoreStart
            @mcrypt_generic_deinit($handle);
            @mcrypt_module_close($handle);
            // @codingStandardsIgnoreEnd
        }

        $this->mcrypt = new \Magento\Framework\Encryption\Adapter\Mcrypt(
            $key,
            $cipher,
            $mode,
            $initVector === false ? null : $initVector
        );
    }

    public function getCipher()
    {
        return $this->mcrypt->getCipher();
    }

    public function getMode()
    {
        return $this->mcrypt->getMode();
    }

    public function getInitVector()
    {
        return $this->mcrypt->getInitVector();
    }

    public function encrypt($data)
    {
        if (strlen($data) == 0) {
            return $data;
        }
        // @codingStandardsIgnoreLine
        return @mcrypt_generic($this->mcrypt->getHandle(), $data);
    }

    public function decrypt($data)
    {
        return $this->mcrypt->decrypt($data);
    }
}