laravel-createEncrypter.php

<?php

namespace App\Providers;

// ...

class AppServiceProvider extends ServiceProvider
{
    // ...

    public static function createEncrypter($key32)
    {
        return new \Illuminate\Encryption\Encrypter($key32, 'AES-256-CBC');
    }
}

$encrypter = AppServiceProvider::createEncrypter($key = \Str::random(32));
$encrypted_data = $encrypter->encrypt('mySecretData');
$decrypted_data = $encrypter->decrypt($encrypted_data); // "mySecretData"

$encrypter = AppServiceProvider::createEncrypter($key);
$decrypted_data = $encrypter->decrypt($encrypted_data); // "mySecretData"