php openssl encrypt and decrypt

openssl-encrypt-decrypt.php

private function Encrypt($data){
        $key = $this->key;
        $password = $this->cookie_salt;
        $encryption_key = base64_decode($key.$password);
        $iv = openssl_random_pseudo_bytes(openssl_cipher_iv_length('aes-256-cbc'));
        $encrypted = openssl_encrypt($data, 'aes-256-cbc', $encryption_key, 0, $iv);
        return base64_encode($encrypted . '::' . $iv);
}

private function Decrypt($data){
        $key = $this->key;
        $password = $this->cookie_salt;
        $encryption_key = base64_decode($key.$password);
        list($encrypted_data, $iv) = explode('::', base64_decode($data), 2);
        return openssl_decrypt($encrypted_data, 'aes-256-cbc', $encryption_key, 0, $iv);
}