PHP openssl

class Openssl
{

    private $key = null;
    private $data = null;
    private $cipher = null;
    private $iv = null;
    private $preKey = 'xxx:xxx:';

    function __construct($data = '', $key = '', $cipher = "") {
        $this->data = $data;
        $this->key = $key;
        $this->cipher = in_array($cipher, openssl_get_cipher_methods()) ? $cipher : "aes-128-cbc";
    }

    public function getIv() {
        $this->iv =  $this->iv ? $this->iv : openssl_random_pseudo_bytes(openssl_cipher_iv_length($this->cipher));
        return $this->iv;
    }

    public function setPreKey($preKey) {
        $this->preKey = $preKey;
        return $this;
    }

    public function setIv($iv) {
        if (!empty($iv)) {
            $this->iv = $iv;
        }
        return $this;
    }

    public function setKey($key) {
        if (!empty($key)) {
            $this->key = $key;
        }
        return $this;
    }

    public function setData($data) {
        if (!empty($data)) {
            $this->data = $data;
        }
        return $this;
    }

    public function encrypt() {
        if (empty($this->key) || empty($this->data)) {
            return false;
        }
        return openssl_encrypt($this->data, $this->cipher, $this->preKey.$this->key, 0, $this->getIv());
    } 

    public function decrypt() {
        if (empty($this->key) || empty($this->data)) {
            return false;
        }
        return openssl_decrypt($this->data, $this->cipher, $this->preKey.$this->key, 0, $this->getIv());
    }
}